Amplifies the voltage across a shunt into a ground-referenced output, in a tiny SC70-6, with a common-mode range of -0.3 to 26 V that works high-side or low-side regardless of the supply. A REF pin sets the zero-current point for bidirectional current, and fixed-gain options (50, 100, 200 V/V) plus low offset make it accurate at small shunt voltages. It runs from a single 2.7 to 5.5 V rail. A small, precise current monitor for compact boards.

Pinout

Pin	Name	Type	Function
1	REF	input	Reference voltage input, 0 V to V+. Sets the output bias for bidirectional current sensing.
2	GND	power_in	Device ground.
3	V+	power_in	Power supply input, 2.7 V to 26 V. Quiescent current 100 uA max. Bypass with 0.01 uF to 0.1 uF to GND.
4	IN+	input	Positive analog input. Connect to the supply side of the external shunt resistor. Common-mode range -0.3 V to 26 V (INA199Ax) or -0.1 V to 26 V (INA199Bx/Cx).
5	IN-	input	Negative analog input. Connect to the load side of the external shunt resistor.
6	OUT	output	Analog output voltage. Output = gain (50/100/200 V/V) x differential shunt voltage, biased around REF.

Key specifications

Parameter	Value
Type	Current-sense amplifier (voltage output)
Common-mode range	-0.3 V to 26 V
Gain options	50 / 100 / 200 V/V
Direction	Bidirectional (via REF)
Offset	Low (uV-class)
Supply	2.7-5.5 V
Package	SC70-6

Ordering variants

Same part, different packaging or reel option.

INA199A1DCKR (gain 50)
INA199A2DCKR (gain 100)
INA199A3DCKR (gain 200)

CAD (KiCad official)

Symbol: Amplifier_Current:INA199xxDCK (KiCad official)
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SC70-6 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (42 pp, sha256 80b0656c17984904, 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