# SN74CBT3253CDBR

**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SSOP-16-208mil

SN74CBT3253CDBR from Texas Instruments, in a SSOP-16-208mil. 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 multiplexer 1, active low; when high, a high-impedance state exists between the 1A and 1B ports. |
| 2 | S1 | input | Select input S1 that, with S0, selects which B port connects to the A port in each multiplexer/demultiplexer; control inputs accept TTL or 5-V/3.3-V CMOS levels. |
| 3 | 1B4 | bidirectional | Multiplexer 1 B4 data port, connected to 1A when OE is low and S1 S0 = H H; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 4 | 1B3 | bidirectional | Multiplexer 1 B3 data port, connected to 1A when OE is low and S1 S0 = H L; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 5 | 1B2 | bidirectional | Multiplexer 1 B2 data port, connected to 1A when OE is low and S1 S0 = L H; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 6 | 1B1 | bidirectional | Multiplexer 1 B1 data port, connected to 1A when OE is low and S1 S0 = L L; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 7 | 1A | bidirectional | Multiplexer 1 common A data port, connected to one of 1B1-1B4 as selected by S1 and S0 when 1OE is low. |
| 9 | 2A | bidirectional | Multiplexer 2 common A data port, connected to one of 2B1-2B4 as selected by S1 and S0 when 2OE is low. |
| 10 | 2B1 | bidirectional | Multiplexer 2 B1 data port, connected to 2A when OE is low and S1 S0 = L L; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 11 | 2B2 | bidirectional | Multiplexer 2 B2 data port, connected to 2A when OE is low and S1 S0 = L H; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 12 | 2B3 | bidirectional | Multiplexer 2 B3 data port, connected to 2A when OE is low and S1 S0 = H L; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 13 | 2B4 | bidirectional | Multiplexer 2 B4 data port, connected to 2A when OE is low and S1 S0 = H H; supports 0 to 5-V signaling with undershoot protection to -2 V. |
| 14 | S0 | input | Select input S0 that, with S1, selects which B port connects to the A port in each multiplexer/demultiplexer; control inputs accept TTL or 5-V/3.3-V CMOS levels. |
| 15 | 2OE | input | Output-enable input for multiplexer 2, active low; when high, a high-impedance state exists between the 2A and 2B ports. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-208mil |
| Category | Logic |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN74CBT3253CDBR`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
- 3D model files: `sn74cbt3253cdbr-etched.step` / `sn74cbt3253cdbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74cbt3253cdbr.step` / `sn74cbt3253cdbr.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/sn74cbt3253c) (26 pp, sha256 `89e75930549ef68c`, retrieved 2026-09-30, tier: lcsc)
- **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/sn74cbt3253cdbr-datasheet.pdf)