# SN74CBT3305CPWR

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

SN74CBT3305CPWR from Texas Instruments, in a TSSOP-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 input for bus switch 1; high connects 1A to 1B, low gives high impedance between them, and it can be driven by TTL or 5-V/3.3-V CMOS outputs. |
| 2 | 1A | bidirectional | Bus switch 1 A port, connected to 1B when 1OE is high, with undershoot protection down to -2 V and 0 to 5.5 V data voltage range. |
| 3 | 1B | bidirectional | Bus switch 1 B port, connected to 1A when 1OE is high, with undershoot protection down to -2 V and 0 to 5.5 V data voltage range. |
| 4 | GND | power_in | Ground pin; continuous current through VCC or GND is limited to ±100 mA. |
| 5 | 2A | bidirectional | Bus switch 2 A port, connected to 2B when 2OE is high, with undershoot protection down to -2 V and 0 to 5.5 V data voltage range. |
| 6 | 2B | bidirectional | Bus switch 2 B port, connected to 2A when 2OE is high, with undershoot protection down to -2 V and 0 to 5.5 V data voltage range. |
| 7 | 2OE | input | Output-enable input for bus switch 2; high connects 2A to 2B, low gives high impedance between them, and it can be driven by TTL or 5-V/3.3-V CMOS outputs. |
| 8 | VCC | power_in | Supply voltage pin with a recommended operating range of 4 V to 5.5 V and an absolute maximum of 7 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN74CBT3305CPWR`
- Footprint: `Package_SO:TSSOP-8_3x3mm_P0.65mm`
- 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `sn74cbt3305cpwr-etched.step` / `sn74cbt3305cpwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74cbt3305cpwr.step` / `sn74cbt3305cpwr.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/sn74cbt3305c.pdf) (18 pp, sha256 `96456caabbbe6397`, 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/sn74cbt3305cpwr-datasheet.pdf)