# SN74AUC2G66DCTR

**Texas Instruments** · Analog Switches, Multiplexers · MSOP-8

SN74AUC2G66DCTR from Texas Instruments, in a MSOP-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 | 1A | passive | Analog switch 1 A-side input/output terminal; the I/O port voltage is limited to 0 V to VCC (absolute maximum -0.5 V to VCC + 0.5 V). |
| 2 | 1B | passive | Analog switch 1 B-side input/output terminal; the I/O port voltage is limited to 0 V to VCC (absolute maximum -0.5 V to VCC + 0.5 V). |
| 3 | 2C | input | Control input for analog switch 2; logic low sets the switch OFF and logic high sets it ON, with control input voltage rated 0 V to 3.6 V. |
| 4 | GND | power_in | Ground reference; all voltages are specified with respect to ground. |
| 5 | 2A | passive | Analog switch 2 A-side input/output terminal; the I/O port voltage is limited to 0 V to VCC (absolute maximum -0.5 V to VCC + 0.5 V). |
| 6 | 2B | passive | Analog switch 2 B-side input/output terminal; the I/O port voltage is limited to 0 V to VCC (absolute maximum -0.5 V to VCC + 0.5 V). |
| 7 | 1C | input | Control input for analog switch 1; logic low sets the switch OFF and logic high sets it ON, with control input voltage rated 0 V to 3.6 V. |
| 8 | VCC | power_in | Supply voltage, recommended 0.8 V to 2.7 V (absolute maximum -0.5 V to 3.6 V); unused inputs must be held at VCC or GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | MSOP-8 |
| Category | Interface |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `SN74AUC2G66DCTR`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `sn74auc2g66dctr-etched.step` / `sn74auc2g66dctr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74auc2g66dctr.step` / `sn74auc2g66dctr.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/sn74auc2g66) (25 pp, sha256 `9b8d006b9b3dee8b`, retrieved 2026-10-08, tier: lcsc)
- **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/sn74auc2g66dctr-datasheet.pdf)