Current-sense amplifier that integrates its own precision 2 mOhm shunt on-chip, so a designer drops in one part instead of matching an external resistor to the amplifier and fighting layout parasitics. The inputs handle a common-mode range from -4 to 80 V for high-side use, it carries up to 15 A continuous, and a REF pin sets the zero-current output for bidirectional current. The matched shunt gives a tight, temperature-stable gain error. A complete, board-friendly current measurement in one package.

Pinout

Pin	Name	Type	Function
1	IS-	passive	Load-side terminal of the integrated 2-mΩ shunt resistor. Connect to load. Pins 1, 2, and 3 are internally tied together as one side of the shunt.
2	IS-	passive	Load-side terminal of the integrated 2-mΩ shunt resistor. Connect to load.
3	IS-	passive	Load-side terminal of the integrated 2-mΩ shunt resistor. Connect to load.
4	SH-	output	Kelvin sense output from the load-side of the internal shunt resistor. Connect to IN- directly if no filtering is needed.
5	IN-	input	Amplifier differential input from the load side of the shunt resistor. Common-mode range -4 V to +80 V.
6	GND	power_in	Device ground reference.
7	DNC1	unconnected	Do Not Connect. Leave floating; do not tie to any potential.
8	NC	unconnected	No connect.
9	VS	power_in	Power supply input, 2.7 V to 5.5 V. Draws up to 2.4 mA quiescent current.
10	REF2	input	Reference voltage 2 input, 0 V to VS. Sets the output reference along with REF1 for bidirectional current sensing.
11	REF1	input	Reference voltage 1 input, 0 V to VS. Sets the output reference along with REF2 for bidirectional current sensing.
12	NC	unconnected	No connect.
13	OUT	output	Analog output voltage proportional to sensed current times the gain (100/200/400 mV/A depending on A1/A2/A3 variant).
14	DNC2	unconnected	Do Not Connect. Leave floating; do not tie to any potential.
15	NC	passive	Reserved; connect this pin to GND.
16	IN+	input	Amplifier differential input from the supply side of the shunt resistor. Common-mode range -4 V to +80 V.
17	SH+	output	Kelvin sense output from the supply-side of the internal shunt resistor. Connect to IN+ directly if no filtering is needed.
18	IS+	passive	Supply-side terminal of the integrated 2-mΩ shunt resistor. Connect to supply. Pins 18, 19, and 20 are internally tied together as one side of the shunt.
19	IS+	passive	Supply-side terminal of the integrated 2-mΩ shunt resistor. Connect to supply.
20	IS+	passive	Supply-side terminal of the integrated 2-mΩ shunt resistor. Connect to supply.

Key specifications

Parameter	Value
Type	Current-sense amplifier with integrated shunt
Shunt	2 mOhm integrated
Common-mode range	-4 V to 80 V
Continuous current	15 A
Direction	Bidirectional (via REF)
Gain	Fixed (part option)
Supply	2.7-5.5 V
Package	TSSOP-20

Ordering variants

Same part, different packaging or reel option.

INA253A2PW (gain 2 V/A)
INA253A3PW (gain 4 V/A)
INA253A4PW (gain 8 V/A)

CAD (KiCad official)

Symbol: Amplifier_Current:INA253 (KiCad official)
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (36 pp, sha256 f316d2de54cc0924, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF