# OPA857IRGTR

**Texas Instruments** · Special Purpose Amplifiers · VQFN-16(3x3)

OPA857IRGTR from Texas Instruments, in a VQFN-16(3x3). 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 | GND | power_in | Ground connection. |
| 2 | CTRL | input | Control input to select transimpedance gain: GND (logic 0) selects 5-kΩ internal resistance, +VS (logic 1) selects 20-kΩ internal resistance. |
| 3 | GND | power_in | Ground connection. |
| 4 | GND | power_in | Ground connection. |
| 5 | OUTN | output | Common-mode voltage output reference with 25-Ω series internal resistor. |
| 6 | GND | power_in | Ground connection. |
| 7 | GND | power_in | Ground connection. |
| 8 | OUT | output | Signal output with 25-Ω series internal resistor limiting load current. |
| 9 | +VS | power_in | Supply voltage input, 2.7 V to 3.6 V. |
| 10 | +VS | power_in | Supply voltage input, 2.7 V to 3.6 V. |
| 11 | +VS | power_in | Supply voltage input, 2.7 V to 3.6 V. |
| 12 | GND | power_in | Ground connection. |
| 13 | Test_SD | input | Test mode enable pin; connect to GND for normal operation, connect to +VS to enable test mode. |
| 14 | Test_IN | input | Test mode input; connect to +VS during normal operation. |
| 15 | IN | input | Transimpedance amplifier input with internal protection diodes, maximum 10-mA input current. |
| 16 | NC | unconnected | Not connected. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-16(3x3) |
| Category | Amplifiers/Comparators |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `OPA857IRGTR`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: VQFN-16(3x3) (KiCad packages3D, STEP)
- 3D model files: `opa857irgtr-etched.step` / `opa857irgtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `opa857irgtr.step` / `opa857irgtr.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/opa857) (34 pp, sha256 `345c9fe5e4bb5ed7`, retrieved 2026-10-05, 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-4-5-20251001` (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/opa857irgtr-datasheet.pdf)