# OPA2131UA

**Texas Instruments** · Operational Amplifier · SOIC-8

OPA2131UA 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. |
| 2 | -IN A | input | Inverting input of channel A. |
| 3 | +IN A | input | Noninverting input of channel A. |
| 4 | V- | power_in | Negative (lowest) power supply; supply range is ±4.5V to ±18V dual or 9V to 36V single. |
| 5 | +IN B | input | Noninverting input of channel B. |
| 6 | -IN B | input | Inverting input of channel B. |
| 7 | OUT B | output | Output of channel B. |
| 8 | V+ | power_in | Positive (highest) power supply; supply range is ±4.5V to ±18V dual or 9V to 36V single. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage, dual supply | VS | -18 |  | 18 | V | Dual supply, (V+), (V-) | 6 |
| Supply voltage, single supply | VS |  |  | 36 | V | Single supply | 6 |
| Input current |  | -10 |  | 10 | mA | Input pins diode-clamped to supply rails | 6 |
| Operating temperature | TA | -55 |  | 125 | °C |  | 6 |
| Junction temperature | TJ |  |  | 150 | °C |  | 6 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 6 |
| Supply voltage, dual supply | VS | -4.5 | 15 | 18 | V | Dual supply; printed ±4.5, ±15, ±18 | 6 |
| Supply voltage, single supply | VS | 9 | 30 | 36 | V | Single supply | 6 |
| Ambient temperature | TA | -40 |  | 85 | °C |  | 6 |
| Junction-to-ambient thermal resistance | RθJA |  | 150 |  | °C/W | D (SOIC) 8 pins | 7 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 52.3 |  | °C/W | D (SOIC) 8 pins | 7 |
| Junction-to-board thermal resistance | RθJB |  | 63.5 |  | °C/W | D (SOIC) 8 pins | 7 |
| Junction-to-top characterization parameter | ΨJT |  | 10.7 |  | °C/W | D (SOIC) 8 pins | 7 |
| Junction-to-board characterization parameter | ΨJB |  | 62.4 |  | °C/W | D (SOIC) 8 pins | 7 |
| Input offset voltage | VOS | -1 | 0.2 | 1 | mV | OPAx131UA; typ printed ±0.2 | 8 |
| Input offset voltage drift | dVOS/dT | -10 | 2 | 10 | μV/°C | TA = -40°C to +85°C; typ printed ±2 | 8 |
| Power-supply rejection ratio | PSRR | -200 | 50 | 200 | μV/V | 9V ≤ VS ≤ 36V; typ printed ±50 | 8 |
| Input bias current | IB | -50 | 5 | 50 | pA | typ printed ±5; high-speed test at TJ = 25°C | 8 |
| Input offset current | IOS | -50 | 1 | 50 | pA | typ printed ±1; high-speed test at TJ = 25°C | 8 |
| Common-mode rejection ratio | CMRR | 70 | 80 |  | dB | -12V ≤ VCM ≤ 11.5V | 8 |
| Open-loop voltage gain | AOL | 94 | 110 |  | dB | -12V ≤ VO ≤ 12V | 8 |
| Quiescent current (per amplifier) | IQ | -1.75 | 1.5 | 1.75 | mA | IO = 0mA, OPAx131UA; typ printed ±1.5 | 8 |
| Input voltage noise density | en |  | 21 |  | nV/√Hz | f = 10Hz | 8 |
| Input voltage noise density | en |  | 16 |  | nV/√Hz | f = 100Hz | 8 |
| Input voltage noise density | en |  | 15 |  | nV/√Hz | f = 1kHz | 8 |
| Input current noise density | In |  | 3 |  | fA/√Hz | f = 1kHz | 8 |
| Gain bandwidth product | GBW |  | 4 |  | MHz |  | 8 |
| Slew rate | SR |  | 10 |  | V/μs |  | 8 |
| Settling time 0.1% |  |  | 1.5 |  | μs | 10V step, G = 1 | 8 |
| Settling time 0.01% |  |  | 2 |  | μs | 10V step, G = 1 | 8 |
| Total harmonic distortion plus noise | THD+N |  | 0.0008 |  | % | f = 1kHz, G = 1, VO = 3.5Vrms | 8 |
| Short-circuit current | ISC |  | 20 |  | mA | printed ±20 | 8 |

## CAD (KiCad official)

- Symbol: `OPA2131UA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `opa2131ua-etched.step` / `opa2131ua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `opa2131ua.step` / `opa2131ua.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/lit/ds/symlink/opa2131.pdf) (32 pp, sha256 `190ddff0ca1efd1b`, retrieved 2026-10-31, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/opa2131ua-datasheet.pdf)