INA240
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TI bidirectional current-sense amplifier, SOIC-8. -4 to 80 V common-mode, enhanced PWM rejection. Datasheet-verified.
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markdownINA240
Texas Instruments · Bidirectional current-sense amplifier · SOIC-8
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)
- 3D model files:
ina240-etched.step/ina240-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ina240.step/ina240.glbare the bare package body.
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).