INA139
INA169SBOS181D – DECEMBER 2000 – REVISED NOVEMBER 2005

High-Side Measurement
CURRENT SHUNT MONITORFEATURESDESCRIPTION● COMPLETE UNIPOLAR HIGH-SIDE
CURRENT MEASUREMENT CIRCUIT● WIDE SUPPLY AND COMMON-MODE RANGE● INA139: 2.7V to 40V● INA169: 2.7V to 60V● INDEPENDENT SUPPLY AND INPUT COMMONMODE VOLTAGES● SINGLE RESISTOR GAIN SET● LOW QUIESCENT CURRENT (60µA typ)
● SOT23-5 PACKAGE

The INA139 and INA169 are high-side, unipolar, current
shunt monitors. Wide input common-mode voltage range,high-speed, low quiescent current, and tiny SOT23 packaging enable use in a variety of applications.
Input common-mode and power-supply voltages are independent and can range from 2.7V to 40V for the INA139 and
2.7V to 60V for the INA169. Quiescent current is only 60µA,
which permits connecting the power supply to either side of
the current measurement shunt with minimal error.
The device converts a differential input voltage to a current
output. This current is converted back to a voltage with an
external load resistor that sets any gain from 1 to over 100.
Although designed for current shunt measurement, the circuit invites creative applications in measurement and level
shifting.

APPLICATIONS● CURRENT SHUNT MEASUREMENT:
Automotive, Telephone, Computers● PORTABLE AND BATTERY-BACKUPSYSTEMS● BATTERY CHARGERS● POWER MANAGEMENT● CELL PHONES● PRECISION CURRENT SOURCE

Both the INA139 and INA169 are available in SOT23-5
packages and are specified for the –40°C to +85°C industrial
temperature range.

IS

RS
VIN+
Up to 60V

4

3
VIN+

VIN–

1kΩ

Load

1kΩ

V+
5

OUT
GND
2

VO = ISRSRL/1kΩ

1
RL

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 2000-2005, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

www.ti.com

PACKAGE/ORDERING INFORMATION(1)PACKAGE-LEAD

PACKAGEDESIGNATORSPECIFIEDTEMPERATURE
RANGE

PACKAGEMARKINGORDERING
NUMBER

SOT23-5 Surface-Mount

DBV–40°C to +85°C

E39

INA139NA/250

Tape and Reel, 250

"

"

"

"

INA139NA/3K

Tape and Reel, 3000

SOT23-5 Surface-Mount

DBV–40°C to +85°C

A69

INA169NA/250

Tape and Reel, 250

"

"

"

"

INA169NA/3K

Tape and Reel, 3000

PRODUCT
INA139"INA169"TRANSPORTMEDIA, QUANTITYNOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.

ABSOLUTE MAXIMUM RATINGS(1)Supply Voltage, V+
INA139 ............................................................................... –0.3V to 60V
INA169 ............................................................................... –0.3V to 75V
Analog Inputs, VIN+, VIN–
INA139Common Mode(2) ............................................................ –0.3V to 60V
Differential (VIN+) – (VIN–) .................................................. –40V to 2V
INA169Common Mode(2) ............................................................ –0.3V to 75V
Differential (VIN+) – (VIN–) .................................................. –40V to 2V
Analog Output, Out(2) ........................................................... –0.3V to 40V
Input Current Into Any Pin ............................................................... 10mA
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –65°C to +125°C
Junction Temperature .................................................................... +150°C

ELECTROSTATICDISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled withappropriate precautions. Failure to observe proper handlingand installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of thedevice at these or any other conditions beyond those specified is not implied.
(2) The input voltage at any pin may exceed the voltage shown if the current
at that pin is limited to 10mA.

PIN CONFIGURATION
Top View

2

SOT

OUT

1

GND

2

VIN+

3

5

V+

4

VIN–

INA139, INA169
www.ti.com

SBOS181D

ELECTRICAL CHARACTERISTICS
At TA = –40°C to +85°C, VS = 5V, VIN+ = 12V, and ROUT = 25kΩ, unless otherwise noted.
INA139NA
PARAMETERCONDITION

INPUT
Full-Scale Sense Voltage
Common-Mode Input Range
Common-Mode RejectionMIN

VSENSE = (VIN+) – (VIN–)
VIN+ = 2.7V to 40V, VSENSE = 50mV
VIN+ = 2.7V to 60V, VSENSE = 50mV

2.7
100

MAX

MIN

100

500
40

✽

TMIN to TMAX
V– = 2.7V to 40V, VSENSE = 50mV
V– = 2.7V to 60V, VSENSE = 50mV

±1

VSENSE = 10mV – 150mV
VSENSE = 100mV
VSENSE = 10mV to 150mV
VSENSE = 100mV

990

1000
10
±0.01
±0.5
1 || 5

1010

✽

±0.1
±2

Settling Time (0.1%)
NOISE
Output-Current Noise Density
Total Output-Current Noise
POWER SUPPLY
Operating Range, V+
Quiescent Current

UNITS

✽

✽
60

mV
V
dB
dB
mV
µV/°C
µV/V
µV/V
uA

120
✽
✽

✽

0.1
✽

10

✽
✽
✽
✽
✽

✽

✽
✽

(V+) – 0.9 (V+) – 1.2
VCM – 0.6 VCM – 1.0

FREQUENCY RESPONSE
Bandwidth

MAX

10

10

OUTPUT
Transconductancevs Temperature
Nonlinearity Error
Total Output Error
Output Impedance
Voltage Output
Swing to Power Supply, V+
Swing to Common Mode, VCM

TYP

115
100

Input Bias Current

TEMPERATURE RANGE
Specification, TMIN to TMAX
OperatingStorage
Thermal Resistance

TYP

±0.2
1
0.5

Offset Voltage(1) RTI
vs Temperature
vs Power Supply, V+

INA169NA

✽
✽

✽
✽

µA/V
nA/°C
%
%
GΩ || pF
V
V

ROUT = 10kΩ
ROUT = 20kΩ
5V Step, ROUT = 10kΩ
5V Step, ROUT = 20kΩ

440
220
2.5
5.0

✽
✽
✽
✽

kHz
kHz
µs
µs

BW = 100kHz

20
7

✽
✽

pA/√HznA RMS

2.7
VSENSE = 0, IO = 0

60
–40
–55
–65

θJA

200

40
125

✽

85
125
150

✽
✽
✽

✽

✽

60
✽

V
µA

✽
✽
✽

°C
°C
°C
°C/W

✽ Specification same as for the INA139NA.
NOTE: (1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.

INA139, INA169
SBOS181D

www.ti.com

3

TYPICAL CHARACTERISTICS
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.

COMMON-MODE REJECTION vs FREQUENCYGAIN vs FREQUENCY
40120
Common-Mode Rejection (dB)

RL = 100kΩ
30
RL = 10kΩ

Gain (dB)20
10
RL = 1kΩ

0
–10
–20

G = 100

100
80

G = 10
60
G=1
40
20
0

100

10k

1k

100k

10M

1M

0.1

10

1

Frequency (Hz)POWER-SUPPLY REJECTION vs FREQUENCY

10k

1k

100k

TOTAL OUTPUT ERROR vs VIN

140

5
VIN = (VIN+ − VIN−)–55°C

Total Output Error (%)

120
G = 100
100
PSR (dB)100
Frequency (Hz)G = 10
80
G=1
60

0

+150°C

–5
+25°C
–10

40
–15

20
1

100

10

1k

100k

10k

0

75

100

125

150

TOTAL OUTPUT ERROR
vs POWER-SUPPLY VOLTAGEQUIESCENT CURRENT
vs POWER-SUPPLY VOLTAGE

200

100
Output error is essentiallyindependent of bothV+ supply voltage andinput common-mode voltage.

1

Quiescent Current (µA)

Total Output Error (%)

50

VIN (mV)

2

G=1

0

G = 10G = 25

–1

–2

+150°

80

+125°
+25°

60

–55°

40

20

Use the INA169 with(V+) > 40V

0
0

10

20

30

40

50

60

0

70

Power-Supply Voltage (V)425Frequency (Hz)

10

20

30

40

50

60

70

Power-Supply Voltage (V)INA139, INA169
www.ti.com

SBOS181D

TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.

STEP RESPONSE

STEP RESPONSE

1.5V

1V

G = 100

G = 50

0.5V

0V

1V

2V

G = 100

G = 100V

0V

10µs/div

20µs/div

OPERATION

The transfer function for the INA139 is:Figure 1 shows the basic circuit diagram for both the INA139
and the INA169. Load current, IS, is drawn from the supply,
VS, through the shunt resistor, RS. The voltage drop in the
shunt resistor, VS, is forced across RG1 by the internal op
amp, causing current to flow into the collector of Q1. The
external resistor, RL, converts the output current to a voltage,
VOUT, at the OUT pin.

IO = gm (VIN+) – (VIN–)(1)

where gm = 1000µA/V(2)

In the circuit of Figure 1, the input voltage, (VIN+) – (VIN–), isequal to IS • RS and the output voltage, VOUT, is equal to
IO • RL. The transconductance, gm, of the INA139 is
1000µA/V. The complete transfer function for the current
measurement amplifier in this application is:
VOUT = (IS) (RS) (1000µA/V) (RL)

VP
Load Power Supply+2.7V to 40V(1)V+ power can becommon or
independent ofload supply.

Shunt
RS
VIN+

IS
VIN–
4

3

Load

V+
RG1
1kΩ

2.7V ≤ (V+) ≤ 40V(1)

(3)

RG2
1kΩ

5

Q1

VOLTAGE GAIN

EXACT RL (Ω)

NEAREST 1% RL (Ω)

1

1k

1k

2

2k

2k

5

5k

4.99k

10

10k

10k

20

20k

20k

50

50k

49k

100

100k

100k

INA139
2

OUT
1

+

IO
RL

VO
–

NOTE: (1) Maximum VP and V+ voltage is 60V with the INA169.

FIGURE 1. Basic Circuit Connections.

INA139, INA169
SBOS181D

www.ti.com

5

The maximum differential input voltage for accurate measurements is 0.5V, which produces a 500µA output current.
A differential input voltage of up to 2V will not cause damage.
Differential measurements (pins 3 and 4) must be unipolarwith a more-positive voltage applied to pin 3. If a morenegative voltage is applied to pin 3, the output current (IO) iszero, but will not cause damage.

IS

3

4

INA139BASIC CONNECTION

RL

Figure 1 shows the basic connection of the INA139. The
input pins, VIN+ and VIN– , must be connected as closely as
possible to the shunt resistor to minimize any resistance inseries with the shunt resistance. The output resistor, RL, isshown connected between pin 1 and ground. Best accuracy
is achieved with the output voltage measured directly across
RL. This is especially important in high-current systems
where load current can flow in the ground connections,affecting the measurement accuracy.
No power-supply bypass capacitors are required for stabilityof the INA139. However, applications with noisy or highimpedance power supplies can require decoupling capacitors to reject power-supply noise; connect the bypass capacitors close to the device pins.

ZIN

OPA340Buffer of amp drives the A/D converter
without affecting gain.

FIGURE 2. Buffering Output to Drive the A/D Converter.

OUTPUT VOLTAGE RANGE
The output of the INA139 is a current that is converted to a
voltage by the load resistor, RL. The output current remains
accurate within the compliance voltage range of the output
circuitry. The shunt voltage and the input common-mode andpower-supply voltages limit the maximum possible output
swing. The maximum output voltage compliance is limited by
the lower of the two equations below:
VOUT MAX = (V+) – 0.7V – (VIN+ – VIN–)

(4)

or

POWER SUPPLIESVOUT MAX = (VIN–) – 0.5V

The input circuitry of the INA139 can accurately measure
beyond its power-supply voltage, V+. For example, the V+
power supply can be 5V whereas the load power-supply
voltage is up to +36V (or +60V with the INA169). However,
the output voltage range of the OUT terminal (pin 1) is limitedby the lesser of the two voltages (see the Output Voltage
Range section).

SELECTING RS AND RL
The value chosen for the shunt resistor, RS, depends on theapplication and is a compromise between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better accuracy at lower
currents by minimizing the effects of offset, whereas low
values of RS minimize voltage loss in the supply line. For mostapplications, best performance is attained with an RS valuethat provides a full-scale shunt voltage of 50mV to 100mV;
maximum input voltage for accurate measurements is 500mV.
RL is chosen to provide the desired full-scale output voltage.
The output impedance of the INA139 OUT terminal is very
high, which permits using values of RL up to 100kΩ withexcellent accuracy. The input impedance of any additional
circuitry at the output must be much higher than the value of
RL to avoid degrading accuracy.
Some Analog-to-Digital (A/D) converters have input impedances that will significantly affect measurement gain. The input
impedance of the A/D converter can be included as part of theeffective RL if its input can be modeled as a resistor to ground.
Alternatively, an op amp can be used to buffer the A/D
converter input, as shown in Figure 2, see Figure 1 forrecommended values of RL.

6(5)(whichever is lower)

BANDWIDTH
Measurement bandwidth is affected by the value of the load
resistor, RL. High gain produced by high values of RL will
yield a narrower measurement bandwidth (see the TypicalCharacteristics). For widest possible bandwidth, keep thecapacitive load on the output to a minimum.
If bandwidth limiting (filtering) is desired, a capacitor can be
added to the output, as shown in Figure 3, which will notcause instability.

3

4
f–3dB
INA1391
f–3dB =
2πRLCL
VO
RL

CL

FIGURE 3. Output Filter.

APPLICATIONSThe INA139 is designed for current shunt measurement
circuits (see Figure 1), but its basic function is useful in awide range of circuitry. A creative engineer will find many
unforeseen uses in measurement and level shifting circuits.
A few ideas are illustrated in Figures 4 through 7.

INA139, INA169
www.ti.com

SBOS181D

3

4

3

VR

INA139

4

REF200100µA

INA139

R1
VO

1

V+

VO

1

R2

RL

Gain Set by R1 R2(V )R
Output Offset = R 2
R1 + R 2

Gain Set by RL
Output Offset = (100µA)(RL)(independent of V+)a) Using resistor divider.

b) Using current source.

FIGURE 4. Offsetting the Output Voltage.

±1A

Charger

1Ω

3

4

4

3

1kΩ

1kΩ

1kΩ

1kΩ

+
48V

+5V

+5V

5

Load

5

INA1692

1

INA1692

1
1N4148Comparator

1N4148
SIGN

10kΩ

10kΩ

0V to 1VVO
100kΩ

FIGURE 5. Bipolar Current Measurement.

INA139, INA169
SBOS181D

www.ti.com

7

RS

V+

4

3

4

3

+5V
+5V

+5V
5

REFOUT BUFIN

5

DigitalI/O

INA139BUF

INA1392

1

REF

BUFOUT

2

1

RL
25kΩ

MUX

RL
25kΩ

12-BitA/D
Converter

PGIA

Clock
Divider
Oscillator

SerialI/O

ADS7870

The A/D converter is programmed for differential input.
Depending on the polarity of the current, one INA139 provides
an output voltage whereas the output of the other is zero.

FIGURE 6. Bipolar Current Measurement Using a Differential Input of the A/D Converter.

Other INA169s
Digital I/O on the ADS7870 provides power toselect the desired INA169. Diodes prevent
output current of an on INA169 from flowing
into an off INA169.

INA169V++5V––

REFOUT BUFIN

Digital
I/O

REF

BUFOUT

BUF

INA169V+––

MUX

12-BitA/D
Converter

PGIA

1N4148RL

Clock
Divider
Oscillator

SerialI/O

ADS7870

FIGURE 7. Multiplexed Measurement Using Logic Signal for Power.

8

INA139, INA169
www.ti.com

SBOS181DPACKAGE OPTION ADDENDUM
www.ti.com

18-Sep-2008

PACKAGING INFORMATION
Orderable Device

Status (1)Package
Type

Package
Drawing

Pins Package Eco Plan (2)Qty

Lead/Ball Finish

MSL Peak Temp (3)INA139NA/250

ACTIVE

SOT-23

DBV

5

250

Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA139NA/250G4

ACTIVE

SOT-23

DBV

5

250

Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA139NA/3K

ACTIVE

SOT-23DBV

53000 Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA139NA/3KG4

ACTIVE

SOT-23DBV

53000 Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA169NA/250

ACTIVE

SOT-23

DBV

5

250

Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA169NA/250G4

ACTIVE

SOT-23

DBV

5

250

Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA169NA/3K

ACTIVE

SOT-23DBV

53000 Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

INA169NA/3KG4

ACTIVE

SOT-23DBV

53000 Green (RoHS &no Sb/Br)CU NIPDAU

Level-2-260C-1 YEAR

(1)

The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be solderedat high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die andpackage, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHScompatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it isprovided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to theaccuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to takereasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF INA139, INA169 :• Automotive: INA139-Q1, INA169-Q1
NOTE: Qualified Version Definitions:

Addendum-Page 1

PACKAGE OPTION ADDENDUM
www.ti.com

18-Sep-2008• Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects

Addendum-Page 2

PACKAGE MATERIALS INFORMATION
www.ti.com

8-Jul-2011

TAPE AND REEL INFORMATION*All dimensions are nominal

DevicePackage Package Pins
Type Drawing

SPQ

Reel
Reel
A0
Diameter Width (mm)(mm) W1 (mm)

INA139NA/250

SOT-23

DBV

5

250

178.0

9.0

B0
(mm)

K0
(mm)

P1
(mm)

W
Pin1
(mm) Quadrant

3.23

3.17

1.37

4.0

8.0

Q3

INA139NA/3K

SOT-23

DBV

5

3000

178.0

9.0

3.23

3.17

1.37

4.0

8.0

Q3

INA169NA/250

SOT-23

DBV

5

250

178.0

9.0

3.23

3.17

1.37

4.0

8.0

Q3

INA169NA/3K

SOT-23

DBV

5

3000

178.0

9.0

3.23

3.17

1.37

4.0

8.0

Q3

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION
www.ti.com

8-Jul-2011*All dimensions are nominal

DevicePackage Type

Package Drawing

Pins

SPQ

Length (mm)Width (mm)Height (mm)

INA139NA/250

SOT-23DBV

INA139NA/3K

SOT-23

DBV

5

250

180.0

180.0

18.0

5

3000

180.0

180.0

18.0

INA169NA/250

SOT-23DBV

INA169NA/3K

SOT-23

DBV

5

250

180.0

180.0

18.0

5

3000

180.0

180.0

18.0

Pack Materials-Page 2

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and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may beprovided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products insuch safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
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the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products

Applications

Audio

www.ti.com/audio

Communications and Telecom www.ti.com/communications

Amplifiers

amplifier.ti.com

Computers and Peripherals

www.ti.com/computers

Data Converters

dataconverter.ti.com

Consumer Electronics

www.ti.com/consumer-apps

DLP® Products

www.dlp.com

Energy and Lighting

www.ti.com/energy

DSP

dsp.ti.com

Industrial

www.ti.com/industrial

Clocks and Timers

www.ti.com/clocks

Medicalwww.ti.com/medical

Interfaceinterface.ti.com

Security

www.ti.com/security

Logic

logic.ti.com

Space, Avionics and Defense

www.ti.com/space-avionics-defense

Power Mgmt

power.ti.com

Transportation andAutomotive

www.ti.com/automotive

Microcontrollers

microcontroller.ti.com

Video and Imaging

www.ti.com/video

RFID

www.ti-rfid.com

Wireless

www.ti.com/wireless-apps

RF/IF and ZigBee® Solutions

www.ti.com/lprf
TI E2E Community Home Page

e2e.ti.com

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