# SN74CBT3306DR

**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-8

SN74CBT3306DR 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 | 1OE | input | Output-enable for bus switch 1; when high the 1A-1B switch is disabled, and when low the A port is connected to the B port (TTL-compatible input). Unused control inputs must be held at VCC or GND. |
| 2 | 1A | passive | A port of bus switch 1, a 5-Ω FET pass switch to 1B when 1OE is low; continuous channel current is limited to 128 mA. |
| 3 | 1B | passive | B port of bus switch 1, a 5-Ω FET pass switch to 1A when 1OE is low; continuous channel current is limited to 128 mA. |
| 4 | GND | power_in | Ground reference; unused control inputs must be held at VCC or GND for proper operation. |
| 5 | 2A | passive | A port of bus switch 2, a 5-Ω FET pass switch to 2B when 2OE is low; continuous channel current is limited to 128 mA. |
| 6 | 2B | passive | B port of bus switch 2, a 5-Ω FET pass switch to 2A when 2OE is low; continuous channel current is limited to 128 mA. |
| 7 | 2OE | input | Output-enable for bus switch 2; when high the 2A-2B switch is disabled, and when low the A port is connected to the B port (TTL-compatible input). Unused control inputs must be held at VCC or GND. |
| 8 | VCC | power_in | Supply voltage, recommended 4 V to 5.5 V; absolute maximum is -0.5 V to 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Logic |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `SN74CBT3306DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `sn74cbt3306dr-etched.step` / `sn74cbt3306dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74cbt3306dr.step` / `sn74cbt3306dr.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/sn74cbt3306.pdf) (11 pp, sha256 `305f77732da91374`, retrieved 2026-10-08, 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/sn74cbt3306dr-datasheet.pdf)