INA181

@@ -0,0 +1,51 @@+# INA181++**Texas Instruments** · Current-sense amplifier · SOT-23-6++Amplifies the small voltage across a shunt resistor into a ground-referenced output a plain ADC can read. The inputs sense a common-mode bus from -0.2 V to 26 V independent of the supply, so it works high-side or low-side, and a REF pin sets the zero-current output for bidirectional current. The fixed-gain part comes in 20, 50, 100, and 200 V/V options (A1-A4). Runs from a single 2.7 to 5.5 V rail. The single-channel workhorse for board-level current measurement.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | OUT | output | Analog output voltage. V_OUT = Gain x (V_IN+ - V_IN-) + V_REF. Rail-to-rail output. |+| 2 | GND | power_in | Device ground reference. |+| 3 | IN+ | input | Current-sense amplifier positive input. For high-side sensing, connect to the bus-voltage side of the sense resistor; for low-side sensing, connect to the load side. Common-mode range -0.2 V to +26 V. |+| 4 | IN- | input | Current-sense amplifier negative input. For high-side sensing, connect to the load side of the sense resistor; for low-side sensing, connect to the ground side. Common-mode range -0.2 V to +26 V. |+| 5 | REF | input | Reference input that sets the output voltage for zero differential input. Tie to GND for unidirectional sensing or to a mid-supply reference for bidirectional sensing. Valid range 0 V to VS. |+| 6 | VS | power_in | Positive supply. Operating range 2.7 V to 5.5 V. Quiescent current 260 uA (max, INA181). Bypass with 0.1 uF ceramic to GND close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Current-sense amplifier (voltage output) |+| Common-mode range | -0.2 V to 26 V |+| Gain options | 20 / 50 / 100 / 200 V/V (A1-A4) |+| Bandwidth | 350 kHz (gain 20) |+| Direction | Bidirectional (via REF) |+| Supply | 2.7-5.5 V |+| Package | SOT-23-6 |++## Ordering variants++- `INA181A1IDBVR (gain 20)`+- `INA181A2IDBVR (gain 50)`+- `INA181A3IDBVR (gain 100)`+- `INA181A4IDBVR (gain 200)`++## CAD (KiCad official)++- Symbol: `Amplifier_Current:INA181 (KiCad official)`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ina181.pdf) (62 pp, sha256 `b8e948e4b605ffaa`, 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](docs/ina181-datasheet.pdf)

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