# INA166UA

**Texas Instruments** · Instrumentation Amplifiers · SOIC-14

INA166UA from Texas Instruments, in a SOIC-14. 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 | VO1 | passive | Output of input amplifier A1 (internal node, connects through the internal 6kΩ resistor to the output stage). |
| 2 | NC | unconnected | No internal connection. |
| 3 | GS1 | passive | Gain-set terminal; an optional external RG between pin 3 and pin 12 increases gain above the internal G = 2000 per G = 2000 + 60000/RG. |
| 4 | VIN- | power_in | Inverting differential input; input is diode-clamped to the supply rails, limit current to 10mA if the signal swings more than 0.5V beyond the rails. |
| 5 | VIN+ | power_in | Non-inverting differential input; input is diode-clamped to the supply rails, limit current to 10mA if the signal swings more than 0.5V beyond the rails. |
| 6 | V- | power_in | Negative power supply, ±4.5V to ±18V supply range, bypass with 0.1µF tantalum capacitor near the pin. |
| 7 | NC | unconnected | No internal connection. |
| 8 | Sense | input | Output sense terminal; should be a low-impedance connection, as more than 5Ω in series degrades common-mode rejection. |
| 9 | VO | output | Amplifier output, swings to within about 2V of the rails into 2kΩ, with ±60mA continuous short-circuit current. |
| 10 | Ref | input | Output reference terminal, normally grounded; must be low-impedance (under 5Ω in series) and a voltage applied here is summed with the output for offset trim. |
| 11 | V+ | power_in | Positive power supply, ±4.5V to ±18V supply range, bypass with 0.1µF tantalum capacitor near the pin. |
| 12 | GS2 | passive | Gain-set terminal; an optional external RG between pin 3 and pin 12 increases gain above the internal G = 2000. |
| 13 | NC | unconnected | No internal connection. |
| 14 | VO2 | passive | Output of input amplifier A2 (internal node, connects through the internal 6kΩ resistor to the output stage). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Amplifiers/Comparators |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `INA166UA`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `ina166ua-etched.step` / `ina166ua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina166ua.step` / `ina166ua.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/ina166) (11 pp, sha256 `bf43a623bfc9b26e`, retrieved 2026-10-12, tier: lcsc)
- **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/ina166ua-datasheet.pdf)