Transition Guide SGP30 to SGP40
Comparison of Specifications
This guideline is intended to help with the design transition from the older-legacy SGP30 sensors to Sensirion’s next
generation SGP40 sensor. It shows, where changes in design and programming are required to implement the SGP40 into
an existing device using SGP30. Major changes are highlighted in orange, while minor changes with minimal impact on theapplication are highlighted in yellow. Care has been taken that only a minimum amount of adaptations need to beconsidered for replacement.
Actions highlighted in orange and yellow need to be considered:

1Gas Sensing Specifications

Parameter
Processed signal outputs
Raw signal outputs

Measurement range

Specified range
AccuracyLong-term drift

SGP30
SGP40
TVOC signal in ppb
VOC Index signal (via external
CO2eq signal in ppm
VOC Algorithm)
SOUT px1
SRAW px1
SOUT px3(humidity compensated)(humidity compensated)
0–1’000 ppm of ethanol (ethanol 0–1’000 ppm of ethanolsignal)
0–1’000 ppm of H2 (H2 signal)
0.3–30 ppm of ethanol (ethanol 0.3–30 ppm of ethanolsignal)
0.5–3 ppm of H2 (H2 signal)
typ. 15 % m.v. (ethanol signal)
Not specified
typ. 10 % m.v. (H2 signal)
typ. 1.3 % m.v. (ethanol signal) Included in min/max spec oftyp. 1.3 % m.v. (H2 signal)
sensitivity

Resolution

0.2 % m.v.

Device-to-device variation

Not specified

Repeatability

Not specified

Limit of detection

Not specified

Response time

Not specified

Switch-on behavior

Sensitivity

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Not specified

Action/Remark
Only VOC Index available
Only one raw signal is provided
and it is differently scaled
compared to SOUT of SGP30
No change wrt ethanol signal

No change wrt ethanol signal
Not part of specifications
anymoreNot part of specifications
anymoreNot part of specifications
anymore<±15 VOC Index points or <±15
New specification% VOC Index m.v., the larger<±5 VOC Index points or <±5 %New specification
VOC Index m.v., the larger<50 ppb or <10 % ofNew specification
concentration setpoint (ethanol)63 < 10 s
New specification
90 < 30 s
Time until specifications are met:
Time until specifications are met: <1 hMuch shorter switch-on time
24 hTime until reliably detecting VOC
events: <60 sMin.: −710 ticks
Typ.: −870 ticks
Not specified
Max.: −1’030 ticks
New specification(min./max. incl. drift overlifetime)

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2Sensor Integration

Parameter
Supply Voltage VDD & VDDH
Min/max rating for supply
voltage

SGP30
1.62–1.98 V

SGP40
1.7–3.6 V

Action/Remark
Wider range for supply voltage−0.3–2.16 V−0.3–3.6 V

Wider range for supply voltage

Sleep/idle Current

Typical: 2 A (sleep)

Typical: 34 A (idle)

Supply current under operation

Typical: 48.8 mA

Size

2.45 x 2.45 x 0.9 mm3

Typical: 3.5 mA/ 1.8 V
or 2.6 mA/ 3.3 V
2.44 x 2.44 x 0.85 mm3Foot print & pinout

2x3 pins DFN package, seedatasheet

2x3 pins DFN package, seedatasheet

100 nF, VDD & VDDH must beconnected to one single supply
VDD

2x 1 F, add R inline, VDD &VDDH must be connected to one
single supply VDD

0.4 x 0.55 mm20.8 mm

0.4 x 0.55 mm20.8 mm

No change
No change

SGP30
See datasheet

SGP40See datasheet

Action/Remark
No change

Electrical interface

Pin sizePin pitch3

Adapted size of the package
Same footprint, same pinout,central die pad changed, noPCB layout change needed

Change capacitors and add
resistor in series. Connect VDDand VDDH to one single supply
VDD before the RC low pass.

Handling

Parameter
Soldering Instructions

Recommended storage
conditions

Min/max storage conditions

Recommended operating
conditions

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Wider accepted range forstorage conditions−40 to +125 °C
short-term
10 to 95 % RH (non-condensing) −40 to +70 °C
Specifications much clearer now
conditions valid for electrical
0 to 80 % RH. (non-condensing) since it considers integrity ofintegrity only, but not for gas
conditions valid for both
entire product (electrical parts
sensing specs
electrical integrity and gasand MOX)
sensing specs

Area considers only maximum
applicable relative humidity andrange for which humidity
compensation has been
optimized forGreen area marks conditions forwhichhumidity compensation has been
optimized.

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Wider range for operating
conditions

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ParameterMin/max operating conditions

Exposure to light

SGP30
SGP40
−40 to +85 °C−20 to +55 °C
10 to 95 % RH (non-condensing) 0 to 90 % RH (non-condensing)conditions valid for electricalconditions valid for both
integrity only, but not for gas
electrical integrity and gas
sensing specs
sensing specs
The SGP40 should not be
exposed directly to either
No instructions.
sunlight or artificial light sources
during operation.

Adapt mechanical design
according to Handling
Instructions.

Sensor Operation

Parameter
Operation mode

Humidity compensation

SGP30
continuousmax.: –typ.: 1 s (optimized for baselinealgorithm)
min.: 25 ms (40 Hz)
on-chip

SGP40
continuousmax.: 10 s
typ.: 1 s (needed for VOCAlgorithm)
min.: 0.5 s
on-chip

Signal processing

on-chip (ppb output)

external (VOC Index output)

Start-up
Built-in self-test (BIST)

in sleep mode
on-chip

in idle mode
on-chip

Sampling interval

5Specifications much clearer now
since it considers integrity ofentire product (electrical partsand MOX)

Optical change, white spot now
not centered, no functionalchange.

Dust protection membrane

4Action/RemarkAction/Remark
No change
Limited range of samplinginterval
No change
VOC Algorithm must be
implemented on external MCU
No change

Communication with Sensor

ParameterProtocol

SGP30
I2 C

SGP40
I2 C

I2C address

0x580x59

Start-up time

400 ms

400 msStart/Stop sequence

See datasheet

See datasheet

Initialization command
Measure IAQ command
Get IAQ baseline command
Set IAQ baseline command
Get TVOC inceptive baselinecommandSet TVOC baseline command

Hex. code: 0x20 03
Hex. code: 0x20 08
Hex. code: 0x20 15
Hex. code: 0x20 1E

Not provided
Not provided
Not provided
Not provided

Action/Remark
No change
Change of I2C address in driver
softwareNo change
Reprogram according todatasheet
Not needed
Not needed
Not needed
Not needed

Hex. code: 0x20 B3

Not provided

Not needed

Hex. code: 0x20 77

Not provided

Not needed

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Set humidity command

Hex. code: 0x20 61
Hex. code: 0x20 50
Time = 20 ms
The command is used forreading out the raw signals ofpx1 and px3.

Measure raw signal command

Heater off command
Built-in self-test (BIST)command
Soft reset command
Get serial number commandGet feature set command
CRC checksum

6Not provided
Hex. code: 0x20 32
Time = 200 ms
Returned result: 0xD4 00 if all
tests successfully passed
Hex. code: 0x00 06
Hex. code: 0x36 82
Hex. code: 0x20 2F
See datasheet

Humidity values are provided as
Reprogram according toparameters together with thedatasheet
measure command
Hex. code: 0x26 0F
Time = 25 ms
The command is used tostart/continue the operationmode, performing aThis is the standard commandmeasurement, and returning thewhich must be implemented for
raw signal of px1. Additionally,operating SGP40
temperature and humidity values
must be provided along with thecommand at any time. For
details, please refer to thedatasheet.
Added function to enter idle
Hex. code: 0x36 15
mode from VOC operation mode
Hex. code: 0x28 0E
Time = 240 ms
Reprogram according toReturned result: 0xD4 00 if alldatasheettests successfully passed
Hex. code: 0x00 06
No change
Not provided
Feature dropped
Not provided
Feature dropped
See datasheet
No change

Further Specifications

Parameter
Environmental stabilityShelf-life
Material contents

SGP30
Following JEDEC JESD47;
MSL1

SGP40
Action/Remark
Following JEDEC JESD47;
No change
MSL1
It is recommended to further
Shelf-life to be considered
not specified
process the sensors within 1(Sensirion warranty is valid for 1
year after date of delivery.
year after purchase)
RoHS, REACH, Hal-free, WEEE RoHS, REACH, Hal-free, WEEENo change
compliantcompliant

Disclaimer:This guideline has been made with care, it may, however, not be fully complete. For proper integration of SGP40, please also
consult the latest version of the data sheet (available on VOC Sensor SGP40 | Sensirion).

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Revision History
DateDecember 2020www.sensirion.com

Revision
1.0Changes
Initial release

version 1.0 – December 2020

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