# BUF634AIDR

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

BUF634AIDR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BW | input | Bandwidth adjustment input; connect to V- pin for wide-bandwidth mode (210 MHz) or leave floating for low-quiescent current mode (35 MHz). |
| 2 | NC | unconnected | No internal connection. |
| 3 | VIN | power_in | Signal input; accepts linear input voltage range of -13 V to +13 V at RL = 1 kΩ. |
| 4 | V- | power_in | Negative power supply; operating range ±2.25 V to ±18 V total supply voltage. |
| 5 | NC | unconnected | No internal connection. |
| 6 | VO | output | Output; delivers up to ±250 mA continuous output current with output voltage swing from 1.6 V to 2.5 V from supplies depending on output current. |
| 7 | V+ | power_in | Positive power supply; operating range ±2.25 V to ±18 V total supply voltage. |
| 8 | NC | unconnected | No internal connection. |

## 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 VS = (V+) – (V–) | VS |  |  | 40 | V | printed as 40 (±20) | 4 |
| Input voltage | VIN | -0.5 |  | 0.5 | V | printed as VS ± 0.5 V | 4 |
| Operating ambient temperature | TA | -40 |  | 125 | °C |  | 4 |
| Junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Supply voltage (recommended) | VS | 2.25 | 15 | 18 | V | printed as ±2.25 / ±15 / ±18 V | 4 |
| Ambient temperature (recommended) | TA | -40 | 25 | 125 | °C | limited by RθJA and TJ,Max for safe operation (footnote 1) | 4 |
| Input offset voltage (Wide-BW mode) | VOS |  | 36 | 65 | mV | TA = 25℃ | 5 |
| Input bias current (Wide-BW mode) | IB |  | 0.25 | 2 | µA | VIN = 0 V | 5 |
| Gain (Wide-BW mode), RL = 1 kΩ | G |  | 0.95 | 0.99 | V/V | VO = ±10 V, RL = 1 kΩ | 5 |
| Gain (Wide-BW mode), RL = 100 Ω | G |  | 0.93 | 0.95 | V/V | VO = ±10 V, RL = 100 Ω | 5 |
| Gain (Wide-BW mode), RL = 67 Ω | G |  | 0.91 | 0.93 | V/V | VO = ±10 V, RL = 67 Ω | 5 |
| Linear input voltage range (Wide-BW mode) |  | -13 |  | 13 | V | RL = 1 kΩ, IB < 10 µA | 5 |
| Output headroom to supplies (Wide-BW mode) |  |  | 1.6 | 1.8 | V | IO = ±10 mA | 5 |
| Output headroom to supplies (Wide-BW mode) |  |  | 2 | 2.2 | V | IO = ±100 mA | 5 |
| Output headroom to supplies (Wide-BW mode) |  |  | 2.2 | 2.5 | V | IO = ±150 mA | 5 |
| Short-circuit current (Wide-BW mode) | ISC |  | 375 | 550 | mA |  | 5 |
| Operating voltage range (Wide-BW mode) | VS | 2.25 |  | 18 | V | printed as ±2.25 / ±18 V | 5 |
| Quiescent current (Wide-BW mode) | IQ |  | 8.5 | 12 | mA | IO = 0 mA | 5 |
| Power-supply rejection ratio (Wide-BW mode) | PSRR | 64 | 75 |  | dB | VS = ±2.25 V to ±18 V | 5 |
| Input offset voltage (Low-IQ mode) | VOS |  | 36 | 65 | mV | TA = 25℃ | 6 |
| Input bias current (Low-IQ mode) | IB |  | 0.03 | 0.25 | µA | VIN = 0 V | 6 |
| Gain (Low-IQ mode), RL = 1 kΩ | G |  | 0.95 | 0.99 | V/V | VO = ±10 V, RL = 1 kΩ | 6 |
| Gain (Low-IQ mode), RL = 100 Ω | G |  | 0.93 | 0.95 | V/V | VO = ±10 V, RL = 100 Ω | 6 |
| Gain (Low-IQ mode), RL = 67 Ω | G |  | 0.91 | 0.93 | V/V | VO = ±10 V, RL = 67 Ω | 6 |
| Linear input voltage range (Low-IQ mode) |  | -13 |  | 13 | V | RL = 1 kΩ, IB < 10 µA | 6 |
| Output headroom to supplies (Low-IQ mode) |  |  | 1.6 | 1.8 | V | IO = ±10 mA | 6 |
| Output headroom to supplies (Low-IQ mode) |  |  | 2 | 2.2 | V | IO = ±100 mA | 6 |
| Output headroom to supplies (Low-IQ mode) |  |  | 2.2 | 2.5 | V | IO = ±150 mA | 6 |
| Short-circuit current (Low-IQ mode) | ISC |  | 350 | 550 | mA |  | 6 |
| Operating voltage range (Low-IQ mode) | VS | 2.25 |  | 18 | V | printed as ±2.25 / ±18 V | 6 |
| Quiescent current (Low-IQ mode) | IQ |  | 1.5 | 2.3 | mA | IO = 0 | 6 |
| Power-supply rejection ratio (Low-IQ mode) | PSRR | 64 | 80 |  | dB | VS = ±2.25 V to ±18 V | 6 |
| Junction-to-ambient thermal resistance (D SOIC) | RθJA |  | 122.9 |  | °C/W | D (SOIC) package, 8 pins | 4 |
| Junction-to-case (top) thermal resistance (D SOIC) | RθJC(top) |  | 55.2 |  | °C/W | D (SOIC) package, 8 pins | 4 |
| Junction-to-board thermal resistance (D SOIC) | RθJB |  | 68.4 |  | °C/W | D (SOIC) package, 8 pins | 4 |
| Junction-to-top characterization parameter (D SOIC) | ΨJT |  | 12.1 |  | °C/W | D (SOIC) package, 8 pins | 4 |
| Junction-to-board characterization parameter (D SOIC) | ΨJB |  | 67.2 |  | °C/W | D (SOIC) package, 8 pins | 4 |

## CAD (KiCad official)

- Symbol: `BUF634AIDR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `buf634aidr-etched.step` / `buf634aidr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `buf634aidr.step` / `buf634aidr.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/buf634a.pdf) (47 pp, sha256 `556148100a323c7c`, retrieved 2026-09-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/buf634aidr-datasheet.pdf)