# OPA2891DR

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

OPA2891DR 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 | 1OUT | output | Channel 1 output of the amplifier. |
| 2 | 1IN- | input | Channel 1 inverting input. |
| 3 | 1IN+ | input | Channel 1 noninverting input. |
| 4 | VCC- | power_in | Negative power supply; recommended dual-supply range is ±4.5 V to ±18 V (single-supply 9 V to 36 V). |
| 5 | 2IN+ | input | Channel 2 noninverting input. |
| 6 | 2IN- | input | Channel 2 inverting input. |
| 7 | 2OUT | output | Channel 2 output of the amplifier. |
| 8 | VCC+ | power_in | Positive power supply; recommended dual-supply range is ±4.5 V to ±18 V (single-supply 9 V to 36 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| 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 (VCC+, VCC-) | VCC |  |  | 37 | V |  | 4 |
| Output current | IO |  |  | 240 | mA |  | 4 |
| Differential input voltage | VIO | -1.5 |  | 1.5 | V | Printed as ±1.5 V | 4 |
| Continuous input current | IIN |  |  | 10 | mA |  | 4 |
| Operating free-air temperature | TA | -40 |  | 85 | °C |  | 4 |
| Junction temperature | TJ |  |  | 150 | °C | Any condition | 4 |
| Junction temperature, continuous operation | TJ |  |  | 125 | °C | Continuous operation, long-term reliability | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Supply voltage, dual-supply | VCC | 4.5 | 15 | 18 | V | Dual-supply (printed ±4.5 / ±15 / ±18) | 4 |
| Supply voltage, single-supply | VCC | 9 | 30 | 36 | V | Single-supply | 4 |
| Operating free-air temperature | TA | -40 | 25 | 85 | °C |  | 4 |
| Input offset voltage | VOS |  | 0.2 | 1 | mV | RL = 150Ω: VCC = ±5V or ±15V, TA = 25°C | 6 |
| Input bias current | IIB |  | 9 | 20 | μA | RL = 150Ω: VCC = ±5V or ±15V, TA = 25°C | 6 |
| Input bias current | IIB |  |  | 33 | μA | RL = 150Ω: VCC = ±5V or ±15V, TA = full range | 6 |
| Input offset current | IOS |  | 30 | 250 | nA | RL = 150Ω: VCC = ±5V or ±15V, TA = 25°C | 6 |
| Input offset current | IOS |  |  | 400 | nA | RL = 150Ω: VCC = ±5V or ±15V, TA = full range | 6 |
| Common-mode input voltage range | VICR | -13.8 | 14.3 |  | V | RL = 150Ω: VCC = ±15V | 7 |
| Common-mode input voltage range | VICR | -3.8 | 4.3 |  | V | RL = 150Ω: VCC = ±5V | 7 |
| Common-mode rejection ratio | CMRR | 85 | 104 |  | dB | RL = 150Ω: VCC = ±15V, VICR = ±12V, TA = 25°C | 7 |
| Common-mode rejection ratio | CMRR | 80 |  |  | dB | RL = 150Ω: VCC = ±15V, VICR = ±12V, TA = full range | 7 |
| Common-mode rejection ratio | CMRR | 90 | 106 |  | dB | RL = 150Ω: VCC = ±5V, VICR = ±2.5V, TA = 25°C | 7 |
| Common-mode rejection ratio | CMRR | 85 |  |  | dB | RL = 150Ω: VCC = ±5V, VICR = ±2.5V, TA = full range | 7 |
| Output voltage swing | VO | -12 | 12.9 |  | V | RL = 150Ω: VCC = ±15V, RL = 250Ω | 7 |
| Output voltage swing | VO | -3 | 3.5 |  | V | RL = 150Ω: VCC = ±5V | 7 |
| Output current | IO | 60 | 200 |  | mA | RL = 150Ω: RL = 10Ω, VCC = ±15V | 7 |
| Output current | IO | 50 | 160 |  | mA | RL = 150Ω: RL = 10Ω, VCC = ±5V | 7 |
| Supply current (each amplifier) | ICC |  | 7.5 | 10 | mA | RL = 150Ω: VCC = ±15V, TA = 25°C | 7 |
| Supply current (each amplifier) | ICC |  |  | 11 | mA | RL = 150Ω: VCC = ±15V, TA = full range | 7 |
| Supply current (each amplifier) | ICC |  | 6.5 | 9 | mA | RL = 150Ω: VCC = ±5V, TA = 25°C | 7 |
| Supply current (each amplifier) | ICC |  |  | 10 | mA | RL = 150Ω: VCC = ±5V, TA = full range | 7 |
| Power-supply rejection ratio | PSRR | 90 | 105 |  | dB | RL = 150Ω: VCC = ±5V or ±15V, TA = 25°C | 7 |
| Power-supply rejection ratio | PSRR | 85 |  |  | dB | RL = 150Ω: VCC = ±5V or ±15V, TA = full range | 7 |
| Open-loop gain | AOL | 93 | 100 |  | dB | RL = 1kΩ: VCC = ±15V, VO = ±10V, TA = 25°C | 8 |
| Open-loop gain | AOL | 92 |  |  | dB | RL = 1kΩ: VCC = ±15V, VO = ±10V, TA = full range | 8 |
| Open-loop gain | AOL | 92 | 98 |  | dB | RL = 1kΩ: VCC = ±5V, VO = ±2.5V, TA = 25°C | 8 |
| Open-loop gain | AOL | 91 |  |  | dB | RL = 1kΩ: VCC = ±5V, VO = ±2.5V, TA = full range | 8 |
| Input offset voltage | VOS |  | 0.2 | 1 | mV | RL = 1kΩ: VCC = ±5V or ±15V, TA = 25°C | 8 |
| Input bias current | IIB |  | 9 | 20 | μA | RL = 1kΩ: VCC = ±5V or ±15V, TA = 25°C | 8 |
| Input bias current | IIB |  |  | 33 | μA | RL = 1kΩ: VCC = ±5V or ±15V, TA = full range | 8 |
| Input offset current | IOS |  | 30 | 250 | nA | RL = 1kΩ: VCC = ±5V or ±15V, TA = 25°C | 8 |
| Input offset current | IOS |  |  | 400 | nA | RL = 1kΩ: VCC = ±5V or ±15V, TA = full range | 8 |
| Common-mode input voltage range | VICR | -13.8 | 14.3 |  | V | RL = 1kΩ: VCC = ±15V | 9 |
| Common-mode input voltage range | VICR | -3.8 | 4.3 |  | V | RL = 1kΩ: VCC = ±5V | 9 |
| Common-mode rejection ratio | CMRR | 85 | 104 |  | dB | RL = 1kΩ: VCC = ±15V, VICR = ±12V, TA = 25°C | 9 |
| Common-mode rejection ratio | CMRR | 80 |  |  | dB | RL = 1kΩ: VCC = ±15V, VICR = ±12V, TA = full range | 9 |
| Common-mode rejection ratio | CMRR | 90 | 106 |  | dB | RL = 1kΩ: VCC = ±5V, VICR = ±2.5V, TA = 25°C | 9 |
| Common-mode rejection ratio | CMRR | 85 |  |  | dB | RL = 1kΩ: VCC = ±5V, VICR = ±2.5V, TA = full range | 9 |
| Output voltage swing | VO | -13 | 13.6 |  | V | RL = 1kΩ: VCC = ±15V | 9 |
| Output voltage swing | VO | -3.4 | 3.8 |  | V | RL = 1kΩ: VCC = ±5V | 9 |
| Power-supply rejection ratio | PSRR | 90 | 105 |  | dB | RL = 1kΩ: VCC = ±5V or ±15V, TA = 25°C | 9 |
| Power-supply rejection ratio | PSRR | 85 |  |  | dB | RL = 1kΩ: VCC = ±5V or ±15V, TA = full range | 9 |
| Junction-to-ambient thermal resistance | RθJA |  | 120.6 |  | °C/W | OPA2891, D (SOIC) 8 pins | 5 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 62.7 |  | °C/W | OPA2891, D (SOIC) 8 pins | 5 |
| Junction-to-board thermal resistance | RθJB |  | 63.9 |  | °C/W | OPA2891, D (SOIC) 8 pins | 5 |
| Junction-to-top characterization parameter | ΨJT |  | 16.2 |  | °C/W | OPA2891, D (SOIC) 8 pins | 5 |
| Junction-to-board characterization parameter | ΨJB |  | 62.2 |  | °C/W | OPA2891, D (SOIC) 8 pins | 5 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | to a large copper plane. The thermal pad can be connected to any pin on the device, or any other | 3 |

## CAD (KiCad official)

- Symbol: `OPA2891DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `opa2891dr-etched.step` / `opa2891dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `opa2891dr.step` / `opa2891dr.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/opa2891.pdf) (41 pp, sha256 `52e8b4cc1fbec7f0`, retrieved 2026-10-17, tier: manufacturer)
- **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/opa2891dr-datasheet.pdf)