# SN74HC266DR

**Texas Instruments** · Logic Gates · SOIC-14

SN74HC266DR from Texas Instruments, in a SOIC-14. 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 | input | Input A for XNOR gate 1; performs boolean function Y = A ⊕ B |
| 2 | 1B | input | Input B for XNOR gate 1; performs boolean function Y = A ⊕ B |
| 3 | 1Y | output | Open-drain output Y for XNOR gate 1; capable of ±4-mA output drive at 5V |
| 4 | 2Y | output | Open-drain output Y for XNOR gate 2; capable of ±4-mA output drive at 5V |
| 5 | 2A | input | Input A for XNOR gate 2; performs boolean function Y = A ⊕ B |
| 6 | 2B | input | Input B for XNOR gate 2; performs boolean function Y = A ⊕ B |
| 7 | GND | power_in | Ground; return path for output drain current and reference for logic levels |
| 8 | 3A | input | Input A for XNOR gate 3; performs boolean function Y = A ⊕ B |
| 9 | 3B | input | Input B for XNOR gate 3; performs boolean function Y = A ⊕ B |
| 10 | 3Y | output | Open-drain output Y for XNOR gate 3; capable of ±4-mA output drive at 5V |
| 11 | 4Y | output | Open-drain output Y for XNOR gate 4; capable of ±4-mA output drive at 5V |
| 12 | 4A | input | Input A for XNOR gate 4; performs boolean function Y = A ⊕ B |
| 13 | 4B | input | Input B for XNOR gate 4; performs boolean function Y = A ⊕ B |
| 14 | VCC | power_in | Positive supply voltage; operating range 2V to 6V per Recommended Operating Conditions |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Logic |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN74HC266DR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `sn74hc266dr-etched.step` / `sn74hc266dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hc266dr.step` / `sn74hc266dr.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/sn74hc266.pdf) (24 pp, sha256 `0187c82ba6ba934f`, retrieved 2026-10-06, tier: manufacturer)
- **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/sn74hc266dr-datasheet.pdf)