# SN74CBT3253DBQR

**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SSOP-16-150mil

SN74CBT3253DBQR from Texas Instruments, in a SSOP-16-150mil. 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 | Active-low output enable for mux 1; high disconnects 1A from 1B1-1B4, TTL-compatible input (VIH min 2 V, VIL max 0.8 V). |
| 2 | S1 | input | Select input S1 shared by both multiplexers, chooses the B port with S0; TTL-compatible input (VIH min 2 V, VIL max 0.8 V). |
| 3 | 1B4 | bidirectional | Channel 4 port B of multiplexer 1, connected to 1A when S1 = H and S0 = H with 1OE low. |
| 4 | 1B3 | bidirectional | Channel 3 port B of multiplexer 1, connected to 1A when S1 = H and S0 = L with 1OE low. |
| 5 | 1B2 | bidirectional | Channel 2 port B of multiplexer 1, connected to 1A when S1 = L and S0 = H with 1OE low. |
| 6 | 1B1 | bidirectional | Channel 1 port B of multiplexer 1, connected to 1A when S1 = L and S0 = L with 1OE low. |
| 7 | 1A | bidirectional | Common port A of multiplexer 1, switched to one of 1B1-1B4 with on-state resistance of 5 Ω typ-max 7 Ω at 4.5 V, 64 mA. |
| 8 | GND | power_in | Ground; unused control inputs must be held at VCC or GND. |
| 9 | 2A | bidirectional | Common port A of multiplexer 2, switched to one of 2B1-2B4 with continuous channel current rated at 128 mA max. |
| 10 | 2B1 | bidirectional | Channel 1 port B of multiplexer 2, connected to 2A when S1 = L and S0 = L with 2OE low. |
| 11 | 2B2 | bidirectional | Channel 2 port B of multiplexer 2, connected to 2A when S1 = L and S0 = H with 2OE low. |
| 12 | 2B3 | bidirectional | Channel 3 port B of multiplexer 2, connected to 2A when S1 = H and S0 = L with 2OE low. |
| 13 | 2B4 | bidirectional | Channel 4 port B of multiplexer 2, connected to 2A when S1 = H and S0 = H with 2OE low. |
| 14 | S0 | input | Select input S0 shared by both multiplexers, chooses the B port with S1; TTL-compatible input (VIH min 2 V, VIL max 0.8 V). |
| 15 | 2OE | input | Active-low output enable for mux 2; high disconnects 2A from 2B1-2B4, TTL-compatible input (VIH min 2 V, VIL max 0.8 V). |
| 16 | VCC | power_in | Supply voltage, recommended 4 V to 5.5 V, absolute maximum -0.5 V to 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-150mil |
| Category | Logic |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN74CBT3253DBQR`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-150mil (KiCad packages3D, STEP)
- 3D model files: `sn74cbt3253dbqr-etched.step` / `sn74cbt3253dbqr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74cbt3253dbqr.step` / `sn74cbt3253dbqr.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/sn74cbt3253) (23 pp, sha256 `e6985bcba97d587d`, retrieved 2026-10-05, 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/sn74cbt3253dbqr-datasheet.pdf)