Datasheet – STS4xA
4th Gen., High-Accuracy, 16-bit, Automotive-Grad Temperature Sensor

Highlights
•
•
•
•
•

Temperature accuracy: up to ±0.2 °C
Supply voltage: 1.08 V … 3.6 V
I2C fast mode plus, CRC checksum
Operating range: -40…125 °C
Designed for 85°C/85%RH reliability testing

•
•
•
•

On-board diagnostics (OBD) capable
AEC Q100 qualification, high-reliability design
Mature technology from global market leader
Wettable flanks package

The STS4xA is an automotive-grade digital sensor platform for measuring temperature with different
accuracy gradings. It fulfills demanding reliability requirements for automotive applications, such as
85 °C/85 %RH accelerated life tests. The sensors can be interfaced via I2C. An integrated heater allows foradvanced on-board-diagnostics while the sensor element is designed for reliable operation in harshconditions. The four-pin dual-flat-no-leads package is suitable for surface mount technology (SMT)
processing and can be ordered with comes with wettable flanks which offer superior process integration
and allow optimal inspection and quality control.

Device Overview
Product
STS41A-AWLB

Functional Block Diagram
Details

0x44 I2C addr., wettable flanks,
1.08 V … 3.6 V

See full product list on page 14.

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Contents
1

Quick Start Guide................................................................................................................................................................................ 3

2

Sensor Specifications ........................................................................................................................................................................ 4
2.1 Temperature ............................................................................................................................................................................... 4

3

Electrical Specifications .................................................................................................................................................................... 5
3.1 Electrical Characteristics ........................................................................................................................................................ 5
3.2 Timings ......................................................................................................................................................................................... 6
3.3 Absolute Maximum Ratings ................................................................................................................................................. 6

4

Sensor Operation ................................................................................................................................................................................ 7
4.1 I2C Communication ................................................................................................................................................................. 7
4.2 I2C Communication Timing ................................................................................................................................................. 7
4.3 I2C Data type & length .......................................................................................................................................................... 7
4.4 I2C Checksum Calculation .................................................................................................................................................... 7
4.5 I2C Command Overview ........................................................................................................................................................ 8
4.6 Conversion of Signal Output ............................................................................................................................................... 8
4.7 Serial Number ............................................................................................................................................................................ 9
4.8 Heater Operation ..................................................................................................................................................................... 9
4.9 Reset ............................................................................................................................................................................................105

Physical Specification ......................................................................................................................................................................10
5.1 Package Description..............................................................................................................................................................10
5.2 Packaging Outline- Package with Wettable Flanks ..................................................................................................10
5.3 Land Pattern .............................................................................................................................................................................11
5.4 Pin Assignment & Laser Marking ....................................................................................................................................11
5.5 Thermal Information .............................................................................................................................................................12

6

Quality and Material Contents ....................................................................................................................................................13

7

Tape and Reel Packaging ..............................................................................................................................................................13

8

Product Nomenclature ...................................................................................................................................................................14

9

Ordering Information ......................................................................................................................................................................14

Revision History .........................................................................................................................................................................................15

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1

Quick Start Guide

The STS4xA can be used in the same way as any SHT4xA, for which a typical application circuit is shown on theleft-hand side of Figure 1. After reaching the minimal supply voltage and allowing for the maximal power-up
time of 1 ms the sensor is ready for I2C communication. The quickest way to measure temperature is pseudocoded on the right-hand side of Figure 1. Together with the conversion formulae given in equations ( 1 ) and( 2 ) below, the digital signal can be translated into temperature readings.
Typical application circuit

Pseudo code
i2c_write(i2c_addr=0x44, tx_bytes=[0xFD])
wait_seconds(0.01)
rx_bytes = i2c_read(i2c_addr=0x44,
number_of_bytes=3t_ticks = rx_bytes[0] * 256 + rx_bytes[1]checksum_t = rx_bytes[2]t_degC = -45 + 175 * t_ticks/65535 if (rh_pRH > 100):

Figure 1. Typical application circuit (top) and pseudo code (bottom) for easy starting with the I2C interface.
Find code resources and embedded drivers on: https://github.com/Sensirion/embedded-sht/releases

CAD can be downloaded from SnapEDA:

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Sensor Specifications

Every STS4xA is individually tested and calibrated and is identifiable by its unique serial number (see section
4.7 for details on the serial number). For the calibration, Sensirion uses transfer standards, which are subject toa scheduled calibration procedure. The calibration of the reference, used for the calibration of the transfer
standards, is NIST traceable through an ISO/IEC 17025 accredited laboratory.

2.1

Temperature

Parameter

Conditions

Value

Units

typ.

±0.2

°C

max.

±0.4

°C

high

0.04

°C

medium

0.07

°C

low

0.1

°C

Resolution1

-

0.01

°C

Specified range2-–40 to +125

°C

Response time3

t63%

2

s

Long-term drift4

typ.

<0.03

°C/y

STS41A T Accuracy1

Repeatability

Table 1. General relative humidity sensor specifications.

±1.0

ΔT (°C)STS41A typ
STS41A max

±0.8
±0.6
±0.4
±0.2
±0.0
-40

-20

0

20

40

60

80 100 120
Temperature (°C)

Figure 2. STS41A typical (solid) and maximal (dashed)temperature accuracy.

Resolution of A/D converter.
Specified range refers to the range for which the temperature sensor specification is guaranteed.
3
Time for achieving 63% of a step function, measured at 1 m/s airflow. Response time in the application depends on the design-in of thesensor.
4
Typical value for operation in normal operating range.
1
2

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3

Electrical Specifications

Valid for all electrical specifications: Typical values correspond to VDD = 3.3 V and T = 25 °C. Min. and max.
values are valid in the full temperature range -40 °C … 125 °C, at declared VDD levels and are based on
characterization.

3.1

Electrical Characteristics

Parameter

SymbolConditions

Min

Typ

Max Unit

Supply voltage

VDD

STS41A-AWLB

1.08

3.3

3.6

V

-

Power-up/down

VPOR

STS41A-AWLB:
Static power supply

0.6

-

1.2

V

-

Idle state

-

18

-

µA

-

Measurement

-

320

500

µA

Average current
consumption while
sensor is measuring

Avg., high repeatability
Avg., med. repeatability
Avg., low repeatability

-

20
19
18

-

µA

Avg. current
consumption(continuous operation
with at 1 Hz )V-

Supply current(heater off)IDD

Low level input
voltage

VIL

-

0

-

High level input
voltage

VIH

-

0.7*
VDD

-

VDD

V

Pull up resistors

Rp

STS41A-AWLB:VDD ≥ 1.6 V

390

-

-

Ω

STS41A-AWLB:
2.0V > VDD ≥ 1.6 V,
Rpullup ≥ 390 Ω

-

-

0.2*
VDD

STS41A-AWLB:VDD ≥ 2.0 V,
Rpullup ≥ 390 Ω

-

-

0.4

Low level output
voltage

Capacitive bus load

VOL

Cb

STS41A-AWLB:
Rp ≥ 390 Ω,
VDD ≥ 1.6 V: fast mode
plus

-

-

0.3*

VDD

340

Comments

V

pF

Capac. bus load can be
determined from
Cb < trise /(0.8473*Rp).
Rise times aretrise = 300 ns for fastmode and trise = 120 ns
for fast mode plus

Table 2. Electrical specifications.

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3.2

Timings

Parameter

Power-up time

Soft reset time

Measurement
duration

Heater-on duration

SymbolConditions

tPU

After hard reset,
VDD ≥ VPOR

Min

-

Typ

0.3

Max Unit

1

Comments

ms

Time between VDD
reaching VPOR andsensor entering idle
stateTime between ACK ofsoft reset command andsensor entering idle
state. Also valid for I2C
general call reset.

tSR

After soft reset

-

-

1

ms

tMEAS,lLow repeatability

-

1.3

1.6

ms

tMEAS,mMed. repeatability

-

3.7

4.5

ms

tMEAS,hHigh repeatability

-

6.9

8.3

ms

The three repeatability
modes differ withrespect to measurement
duration, noise leveland energy
consumption

Long pulse

0.81

1

1.19

s

After that time theheater is automaticallyswitched off

Short pulse

0.08

0.1

0.12

s

After that time theheater is automaticallyswitched off

tHeaterTable 3. System timing specifications.

3.3

Absolute Maximum Ratings

Stress levels beyond those listed in Table 4. Absolute maximum ratings. may cause permanent damage oraffect the reliability of the device. These are stress ratings only and functional operation of the device atthese conditions is not guaranteed. Ratings are only tested each at a time.
Parameter

RatingSupply voltage VDD, STS41A-AWLB
Max. voltage on any pin
Operating temperature range
Storage temperature range
ESD HBMESD CDM
Latch-up, JESD78 Class II, 125°C-0.3 V … 4.0 V
VSS - 0.3 V … VDD + 0.3 V-40 °C … 125 °C-40 °C …150 °C
6 kV
750 V
±100 mA

Table 4. Absolute maximum ratings.

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4

Sensor Operation

4.1

I2C Communication

I2C communication is based on NXP’s I2C-bus specification and user manual UM10204, Rev.6, 4 April 2014.
Supported I2C modes are standard, fast mode, and fast mode plus. Data is transferred in multiples of 16-bitwords and 8-bit check sum (cyclic redundancy check = CRC). All transfers must begin with a start condition (S)and terminate with a stop condition (P). To finish a read transfer, send not acknowledge (NACK) and stop
condition (P). Addressing a specific slave device is done by sending its 7-bit I2C address followed by an eighthbit, denoting the communication direction: “zero” indicates transmission to the slave, i.e. “write”, a “one”
indicates a “read” request. Schematics of the I2C transfer types are sketched in Figure 3.

Figure 3. I2C transfer types: First a write header is sent to the I2C slave, followed by a command, for example“measure T with highest precision”. After the measurement is finished the read request directed to this I2C
slave will be acknowledged and transmission of data will be started by the slave.

4.2 I2C Communication Timing
All details on the timing are following the interface specification of NXP’s user manual UM10204, Rev.6, 4 April
2014. Please follow mandatory capacitor and resistor requirements given in Table 2.

4.3 I2C Data type & length
I2C bus operates with 8-bit data packages. Information from the sensor to the master has a checksum after
every second 8-bit data package. Temperature data will always be transmitted by 2 * 8-bit data + 8-bit CRC.

4.4 I2C Checksum Calculation
For read transfers each 16-bit data is followed by a checksum with the following properties
Property
Name
Message Length
Polynomial
Initialization
Reflect Input/Output
Final XORExamples

Value
CRC-8
16-bit0x31 (x8 + x5 + x4 +1)
0xFF
false/false
0x00
CRC(0xBEEF) = 0x92

Table 5. Data Checksum properties
The master may abort a read transfer after the 16-bit data if it does not require a checksum.

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4.5 I2C Command Overview
Command(hex)

Response lengthincl. CRC (bytes)

Description[return values]

0xFD

3

measure T with high precision (high repeatability)[2 * 8-bit T-data; 8-bit CRC]

0xF6

3

measure T with medium precision (medium repeatability)[2 * 8-bit T-data; 8-bit CRC]

0xE0

3

measure T with lowest precision (low repeatability)[2 * 8-bit T-data; 8-bit CRC]

0x89

6

read serial number[2 * 8-bit data; 8-bit CRC; 2 * 8-bit data; 8-bit CRC]

0x94

-

soft reset
[ACK]

0x39

3

activate heater with 200mW for 1s, including a high precision
measurement just before deactivation[2 * 8-bit T-data; 8-bit CRC]

0x32

3

activate heater with 200mW for 0.1s including a high precision
measurement just before deactivation[2 * 8-bit T-data; 8-bit CRC]

0x2F

3

activate heater with 110mW for 1s including a high precision
measurement just before deactivation[2 * 8-bit T-data; 8-bit CRC]

0x24

3

activate heater with 110mW for 0.1s including a high precision
measurement just before deactivation[2 * 8-bit T-data; 8-bit CRC]

0x1E

3

activate heater with 20mW for 1s including a high precision
measurement just before deactivation[2 * 8-bit T-data; 8-bit CRC]

0x15

3

activate heater with 20mW for 0.1s including a high precision
measurement just before deactivation[2 * 8-bit T-data; 8-bit CRC]

Table 6. Overview of I2C commands. If the sensor is not ready to process a command, e.g. because it is stillmeasuring, it will return NACK to the I2C read header. The given heater power values are typical and valid for
VDD = 3.3 V. At VDD = 1.8 V, heating power is reduced to 20% of the nominal value.

4.6 Conversion of Signal Output
The digital sensor signals correspond to following temperature values.
𝑆𝑇
𝑇 = (−45 + 175 ∙ 16
) °C
2 −1
𝑇 = (−49 + 315 ∙www.sensirion.com / D1

𝑆𝑇
) °F
16
2 −1

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4.7

Serial Number

Every single sensor has a unique serial number, that is assigned by Sensirion during production. It is stored in
the one-time-programmable memory and cannot be manipulated after production. The serial number isaccessible via I2C and is transmitted as two 16-bit words, each followed by an 8-bit CRC.

4.8 Heater Operation
The sensor incorporates an integrated on-chip heater which can be switched on by the set of commands given
in Table 6. There are three different heating powers and two different heating times accessible to the user.
After reception of a heater-on command, the sensor executes the following procedure:
1. The heater is enabled, and the timer starts its count-down.
2. On timer expiration a temperature measurement with the highest repeatability is started, the heater
remains enabled.
3. After the measurement is finished the heater is turned off.
4. Temperature are now available for readout.
The maximum on-time of the heater commands is 1 second in order to prevent overheating of the sensor byunintended usage of the heater. Thus, there is no dedicated command to turn off the heater. For extended
heating periods it is required to send periodic heater-on commands, keeping in mind that the heater isdesigned for a maximal duty cycle of less than 10%. To obtain a fast increase in temperature the idle time
between consecutive heating pulses shall be kept minimal.
Parameter
Heater Powerat VDD = 3.3 V
Heater-on Duration (tHeat)
Maximal duty cycle

Selectable Values
0 (=off), 20, 110, 200 mW
0.1, 1 s
10%

Table 7. STS41A heater specifications. The given heater power values are typical and valid for VDD = 3.3 V. At
VDD = 1.8 V, heating power is reduced to 20% of the nominal value.
Possible Heater Use Cases
The heater of the STS4xA can be used to enable OBD functionalities. Instead of checking only for sensor
acknowledgement, sending a heater command and measuring the response gives an unmistakable indicationof the sensor functionality. For this application, we encourage you to reach out to our experts and look forward
to integrate this feature in your application with you.
Important notes for operating the heater:
1.
2.
3.
4.
5.

6.

The heater is designed for a maximum duty cycle of 10%, meaning the total heater-on-time should
not be longer than 10% of the sensor’s lifetime.
During operation of the heater, sensor specifications are not valid.
The temperature sensor can additionally be affected by the thermally induced mechanical stress,
offsetting the temperature reading from the actual temperature.
The sensor’s temperature (base temperature + temperature increase from heater) must not exceed
Tmax = 125 °C to have proper electrical functionality of the chip.
The heater draws a large amount of current once enabled. In the highest power setting it is up to up
to ~75 mA for STS41A-AWLB version. Although a dedicated circuitry draws this current smoothly, thepower supply must be strong enough to avoid large voltage drops that could provoke a sensor reset.
If higher heating temperatures are desired, consecutive heating commands can be sent to the sensor.
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shall only be operated in ambient temperatures below 65 °C else it could drive the sensor outside ofits maximal operating temperature.

4.9 Reset
A reset of the sensor can be achieved in three ways:• I2C Soft reset: send the reset command described in Table 6.
• I2C general call: all devices on I2C bus are reset by sending the command 0x06 to the I2C
address 0x00.
• Power down (incl. pulling SCL and SDA low)5

Physical Specification

5.1

Package Description

STS4xA is provided in a dual flat no lead (DFN) package with wettable flanks. The sensor chip is made of silicon,
hosted on a copper lead frame and overmolded by an epoxy-based mold compound. Exposed bottom side ofthe leadframe with the metallic contacts is Ni/Pd/Au coated, side walls are bare copper.
Moisture sensitivity level (MSL) of 1 according to IPC/JEDEC J-STD-020 is achieved. It is recommended toprocess the sensors within one year after date of delivery.

5.2

Packaging Outline- Package with Wettable Flanks

Figure 4. Dimensional drawing of STS4xA with wettable flanks, including package tolerances (units mm).

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5.3

Land Pattern

The land pattern is recommended to be designed according to the used PCB and soldering process together
with the physical outer dimensions of the sensor. For reference, the land pattern used with Sensirion’s PCBs
and soldering processes is given in Figure 5. Sensirion recommends to not solder the central die pad because
the sensor can reach higher temperatures upon heater activation.

Figure 5. Recommended land pattern (in mm). Details can vary and depend on used PCBs and solder
processes. There shall be no copper under the sensor other than at the pin pads.

5.4 Pin Assignment & Laser Marking

Pin

Name

Comments

1

SDA

Serial data, bidirectional

2

SCL

Serial clock,unidirectional input

3

VDD

Supply voltage

4

VSS

GroundFigure 6 Pin assignment (transparent top view). Dashed lines are only visible if the sensor is viewed frombelow. The die pad is not directly connected to any pin.
The laser marking consists of two lines, indicated in Figure 6. The first line consists of four characters whichstart at pin 4. The first character (here “1”) indicates the accuracy class, the second character (here “A”) indicatesthe automotive grade, the third character (here “X”) indicates the voltage (L: low, H: high) and the fourthcharacter (here “Y”) indicates the I2C address version. In the second line, which consists of three characters andstarts next to the circular pin 1 indicator all three characters (here “ABC”) serve internal batch tracking code.

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5.5

Thermal Information

Symbol

𝑅𝜃𝐽𝐴

𝑅𝜃𝐽𝐶

𝑅𝜃𝐽𝐵

Ψ𝐽𝐵

Ψ𝐽𝑇

Description

Junction-toambie. thermal
resistanceJunction-tocase thermal
resistanceJunction-toboard thermal
resistanceJunction-toboard
characteriz.
param.
Junction-to-top
characteriz.
param.

Heater off,
die padnot solder.
(K/W)
DFN DFN+WF

Heater on,
die padnot solder.
(K/W)
DFN DFN+WF

329

297

322

357

390

255

252

191

188

257

254

177

225

242

193

219

258

284

159

171

223

242

191

213

254

282

38

35

105

104

44

42

112

111

Heater off, die
pad soldered(K/W)

Heater on, die
pad soldered
(K/W)

DFN

DFN+WFDFN

DFN+WF

246

258

308

189

183

159

Table 8. Typical values for thermal metrics. In the “heater on” columns a heater power of 200 mW wasassumed. Soldering of the die pad is not recommended, therefore the two right hand side columns are bold.
The sub-columns labelled “DFN+WF” display the results for the DFN package with soldered wettable flanks
terminals. Values are based on simulation.

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6

Quality and Material Contents

Qualification of STS4xA is performed based on the AEC Q100 qualification test method. Qualification
pending. The device is fully RoHS and WEEE compliant, e.g. free of Pb, Cd, and Hg.

7

Tape and Reel Packaging

All specifications for the tape and reel packaging can be found on Figure 7. The 10k Reel packaging
has a Reel diameter of 13 inches.

Figure 7. Tape and reel specifications including sensor orientation in pocket (see indication of two sensors on
the right side of the tape).

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8

Product Nomenclature

Position

Value(s)Explanation

1

S

Sensirion

2T

Temperature Signal

3

S

Sensor4

4

Fourth product generation

51±0.2 °C

6

A

automotive version

7-

delimiter

8A

I2C interface with 0x44 address

9W

DFN package with wettable flanks

10

L

VDD = 1.08 V … 3.6 V

11B

Blank package

12-delimiter

13

R

Tape on reel packaging

14

3

Packaging article contains 10’000 pieces

Table 9. STS41A product nomenclature.

9

Ordering Information

Material Description
STS41A-AWLB-R3

Material Number
3.001.125

Details
improved T accuracy, 0x44 I2C addr.,
wettable flanks, VDD = 1.08 V … 3.6 V

Quantity (pcs)
10’000

Table 10. STS41A ordering options.

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Revision History
Date

VersionPage(s)Changes

August 2022

1

All

First release

Mai 2023

2

All
11
14

Reformatting
Showing only package outline with wettable Flanks
Updated Table 10: only Wettable-flanks option available

November 2023

4

4
10

Updated temperature accuracy specification
Updated package dimensional drawing

April 2024

5

4
10
11

Updated accuracy graph and section title
Updated Package Outline
Updated new Laser Marking

September 2024

6

All

Updated standard sensor voltage

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Important Notices
Warning, Personal Injury
Do not use this product as safety or emergency stop devices or in any other application where failure of the product could
result in personal injury. Do not use this product for applications other than its intended and authorized use. Before installing,
handling, using or servicing this product, please consult the data sheet and application notes. Failure to comply with these
instructions could result in death or serious injury.
If the Buyer shall purchase or use SENSIRION products for any unintended or unauthorized application, Buyer shall defend,
indemnify and hold harmless SENSIRION and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs,
damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or deathassociated with such unintended or unauthorized use, even if SENSIRION shall be allegedly negligent with respect to the designor the manufacture of the product.
ESD Precautions
The inherent design of this component causes it to be sensitive to electrostatic discharge (ESD). To prevent ESD-induced damage
and/or degradation, take customary and statutory ESD precautions when handling this product. See application note “ESD, Latchup
and EMC” for more information.
Warranty
SENSIRION warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery
that this product shall be of the quality, material and workmanship defined in SENSIRION’s published specifications of the product.
Within such period, if proven to be defective, SENSIRION shall repair and/or replace this product, in SENSIRION’s discretion, freeof charge to the Buyer, provided that:•
notice in writing describing the defects shall be given to SENSIRION within fourteen (14) days after their appearance;•such defects shall be found, to SENSIRION’s reasonable satisfaction, to have arisen from SENSIRION’s faulty design, material,
or workmanship;•
the defective product shall be returned to SENSIRION’s factory at the Buyer’s expense; and•the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period.
This warranty does not apply to any equipment which has not been installed and used within the specifications recommended by
SENSIRION for the intended and proper use of the equipment. EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN,SENSIRION MAKES NO WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALL
WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULARPURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.
SENSIRION is only liable for defects of this product arising under the conditions of operation provided for in the data sheet andproper use of the goods. SENSIRION explicitly disclaims all warranties, express or implied, for any period during which the goods
are operated or stored not in accordance with the technical specifications.
SENSIRION does not assume any liability arising out of any application or use of any product or circuit and specifically disclaims
any and all liability, including without limitation consequential or incidental damages. All operating parameters, including without
limitation recommended parameters, must be validated for each customer’s applications by customer’s technical experts.
Recommended parameters can and do vary in different applications.
SENSIRION reserves the right, without further notice, (i) to change the product specifications and/or the information in thisdocument and (ii) to improve reliability, functions and design of this product.

Headquarters and Subsidiaries
Sensirion AG
Laubisruetistr. 50
CH-8712 Staefa ZH
Switzerland

Sensirion Inc., USA
phone: +1 312 690 5858
info-us@sensirion.com
www.sensirion.com

Sensirion Korea Co. Ltd.
phone: +82 31 337 7700~3
info-kr@sensirion.com
www.sensirion.com/kr

phone: +41 44 306 40 00
fax:+41 44 306 40 30
info@sensirion.com
www.sensirion.com

Sensirion Japan Co. Ltd.
phone: +81 45 270 4506
info-jp@sensirion.com
www.sensirion.com/jp

Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info-cn@sensirion.com
www.sensirion.com/cn

Sensirion Taiwan Co. Ltd
phone: +886 2 2218-6779
info@sensirion.com
www.sensirion.com

To find your local representative, please visit
www.sensirion.com/distributors

Copyright © 2024, by SENSIRION. CMOSens® is a trademark of Sensirion. All rights reserved
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