# INA281B3QDBVRQ1

**Texas Instruments** · Current Sense Amplifiers · SOT-23-5

INA281B3QDBVRQ1 from Texas Instruments, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT | output | Output voltage that swings between GND and VS; with zero sense input the output stays at or below GND + 20 mV, and a differential input of at least 20 mV/gain is needed to keep it in the linear range. |
| 2 | GND | power_in | Ground reference pin for the device. |
| 3 | Vs | power_in | Power supply pin with a recommended operating range of 2.7 V to 20 V (5 V nominal); the output swing is limited by this supply voltage. |
| 4 | IN+ | input | Positive shunt sense input with a recommended common-mode range of -4 V to 110 V (absolute maximum -20 V to 120 V). |
| 5 | IN- | input | Negative shunt sense input with a recommended common-mode range of -4 V to 110 V (absolute maximum -20 V to 120 V); the device is unidirectional, so VSENSE = VIN+ - VIN- should be positive. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-5 |
| Category | Amplifiers/Comparators |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `INA281B3QDBVRQ1`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `ina281b3qdbvrq1-etched.step` / `ina281b3qdbvrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina281b3qdbvrq1.step` / `ina281b3qdbvrq1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ina281-q1) (25 pp, sha256 `949a18f2e6fc9deb`, retrieved 2026-10-10, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ina281b3qdbvrq1-datasheet.pdf)