# OPA2251UA

**Texas Instruments** · Precision Op Amps · SOIC-8

OPA2251UA from Texas Instruments, in a SOIC-8. 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 A | output | Output of channel A; short-circuit to ground is continuous for one amplifier per package. |
| 2 | -IN A | input | Inverting input of channel A; absolute maximum input is (V-) - 0.5 V to (V+) + 0.5 V with differential limit of ±0.5 V. |
| 3 | +IN A | input | Noninverting input of channel A; absolute maximum input is (V-) - 0.5 V to (V+) + 0.5 V with differential limit of ±0.5 V. |
| 4 | V- | power_in | Negative (lowest) power supply; ground in single-supply use, down to -18 V in dual-supply use. |
| 5 | +IN B | input | Noninverting input of channel B; absolute maximum input is (V-) - 0.5 V to (V+) + 0.5 V with differential limit of ±0.5 V. |
| 6 | -IN B | input | Inverting input of channel B; absolute maximum input is (V-) - 0.5 V to (V+) + 0.5 V with differential limit of ±0.5 V. |
| 7 | OUT B | output | Output of channel B; short-circuit to ground is continuous for one amplifier per package. |
| 8 | V+ | power_in | Positive (highest) power supply; total supply 2.7 V to 36 V single supply or ±1.35 V to ±18 V dual supply. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `OPA2251UA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `opa2251ua-etched.step` / `opa2251ua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `opa2251ua.step` / `opa2251ua.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/opa2251) (35 pp, sha256 `acaba6478cae06e8`, 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/opa2251ua-datasheet.pdf)