A high- and low-side, bidirectional current-sense amplifier in SOIC-8, built for measuring motor and solenoid currents. It reads the small voltage across a shunt resistor whose common-mode can sit anywhere from -4 V to +80 V, independent of its own supply, so it works on the high side of a battery rail or across a low-side shunt. Its standout feature is enhanced PWM rejection: it rejects the large common-mode steps that switching motor drives produce, giving a clean current signal where an ordinary op-amp shunt monitor would ring. A REF input centers the output for bidirectional (charge/discharge, forward/reverse) sensing. Fixed gains of 20 to 200 V/V are offered by variant. Runs 2.7-5.5 V.

Pinout

Pin	Name	Type	Function
1	NC	unconnected	No internal connection. Reserved - connect to ground or leave floating.
2	IN+	input	Non-inverting differential analog input. Connect to the supply (high) side of the shunt resistor. Common-mode range −4 V to +80 V independent of VS.
3	IN-	input	Inverting differential analog input. Connect to the load side of the shunt resistor. Shares the −4 V to +80 V common-mode range with IN+.
4	GND	power_in	Analog ground / device ground return.
5	VS	power_in	Positive supply, 2.7 V to 5.5 V. Bypass to GND with a 0.1 µF ceramic close to the pin. Quiescent current 1.8 mA typ, 2.4 mA max.
6	REF2	input	Reference-2 input for setting the output midpoint. Valid input range 0 V to VS. Tie to VS or to a second reference to configure unidirectional or bidirectional output midpoint.
7	REF1	input	Reference-1 input for setting the output midpoint. Valid input range 0 V to VS. Combined with REF2 to form the output offset per the Adjusting the Output Midpoint With the Reference Pins section.
8	OUT	output	Buffered analog output voltage, VOUT = Gain × VSENSE + VREF, where Gain is 20/50/100/200 V/V for A1/A2/A3/A4. Swings from GND+10 mV to VS−0.2 V into 10 kΩ.

Key specifications

Parameter	Value
Type	Bidirectional current-sense amplifier
Common-mode range	-4 V to +80 V
Feature	enhanced PWM rejection
Gain	20 / 50 / 100 / 200 V/V (by variant)
Bandwidth	400 kHz
Reference	REF pins (bidirectional zero)
Supply voltage	2.7-5.5 V
Package	SOIC-8

Ordering variants

Same part, different packaging or reel option.

INA240A1D (SOIC-8, gain 20)
INA240A2D (SOIC-8, gain 50)

CAD (KiCad official)

Symbol: Amplifier_Current:INA240A1D
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D)

Provenance

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

Datasheet: Texas Instruments datasheet (39 pp, sha256 c9d26e72ebdb52a1, 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