Amplifies the voltage across a shunt into a ground-referenced output, in a tiny SOT-563, with a common-mode range from -0.2 to 26 V so it works high-side or low-side regardless of the supply. A REF pin sets the zero-current output for bidirectional current, and the fixed-gain options (20 to 100 V/V) plus high bandwidth track fast load steps. It runs from a single 2.7 to 5.5 V rail. The small, low-cost sibling of the INA181 for board-level current measurement.

Pinout

Pin	Name	Type	Function
1	OUT	output	Analog output voltage. Buffered amplifier output representing the amplified sense-resistor differential voltage referenced to REF.
2	GND	power_in	Device ground reference.
3	IN+	input	Current-sense amplifier positive (noninverting) input. For high-side applications, connect to bus-voltage side of sense resistor. For low-side applications, connect to load side of sense resistor. Common-mode range -0.2 V to +26 V.
4	IN-	input	Current-sense amplifier negative (inverting) input. For high-side applications, connect to load side of sense resistor. For low-side applications, connect to ground side of sense resistor. Common-mode range -0.2 V to +26 V.
5	REF	input	Reference input. Sets the output zero-current reference voltage; typically driven to VS/2 for bidirectional sensing or to GND for unidirectional sensing.
6	VS	power_in	Power supply, 2.7 V to 5.5 V. Bypass locally with a 0.1-μF ceramic capacitor to GND.

Key specifications

Parameter	Value
Type	Current-sense amplifier (voltage output)
Common-mode range	-0.2 V to 26 V
Gain options	20 / 50 / 100 V/V
Bandwidth	Up to 350 kHz
Direction	Bidirectional (via REF)
Supply	2.7-5.5 V
Package	SOT-563

Ordering variants

Same part, different packaging or reel option.

INA185A1IDRLR (gain 20)
INA185A2IDRLR (gain 50)
INA185A3IDRLR (gain 100)

CAD (KiCad official)

Symbol: Amplifier_Current:INA185 (KiCad official)
Footprint: Package_TO_SOT_SMD:SOT-563
3D model: SOT-563 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (37 pp, sha256 d1b65f23841d266c, 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