component
SN74CBT3257CDBQR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SSOP-16-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN74CBT3257CDBQR
Texas Instruments · Signal Switches, Multiplexers, Decoders · SSOP-16-150mil
SN74CBT3257CDBQR 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 | S | input | Select input that chooses between the B1 and B2 port for each A port; VIH 2 V min, VIL 0.8 V max, must be held at VCC or GND when unused. |
| 2 | 1B1 | bidirectional | Channel 1 B1 port, connected to 1A when OE is low and S is low; supports 0 to 5.5 V data levels. |
| 3 | 1B2 | bidirectional | Channel 1 B2 port, connected to 1A when OE is low and S is high; supports 0 to 5.5 V data levels. |
| 4 | 1A | bidirectional | Channel 1 A port, switched to 1B1 or 1B2 depending on S; high impedance when OE is high. |
| 5 | 2B1 | bidirectional | Channel 2 B1 port, connected to 2A when OE is low and S is low; supports 0 to 5.5 V data levels. |
| 6 | 2B2 | bidirectional | Channel 2 B2 port, connected to 2A when OE is low and S is high; supports 0 to 5.5 V data levels. |
| 7 | 2A | bidirectional | Channel 2 A port, switched to 2B1 or 2B2 depending on S; high impedance when OE is high. |
| 8 | GND | power_in | Ground reference. |
| 9 | 3A | bidirectional | Channel 3 A port, switched to 3B1 or 3B2 depending on S; high impedance when OE is high. |
| 10 | 3B2 | bidirectional | Channel 3 B2 port, connected to 3A when OE is low and S is high; supports 0 to 5.5 V data levels. |
| 11 | 3B1 | bidirectional | Channel 3 B1 port, connected to 3A when OE is low and S is low; supports 0 to 5.5 V data levels. |
| 12 | 4A | bidirectional | Channel 4 A port, switched to 4B1 or 4B2 depending on S; high impedance when OE is high. |
| 13 | 4B2 | bidirectional | Channel 4 B2 port, connected to 4A when OE is low and S is high; supports 0 to 5.5 V data levels. |
| 14 | 4B1 | bidirectional | Channel 4 B1 port, connected to 4A when OE is low and S is low; supports 0 to 5.5 V data levels. |
| 15 | OE | input | Active-low output enable; low enables the switches and high gives a high-impedance state between A and B, and it should be tied to VCC through a pullup resistor for power up/down. |
| 16 | VCC | power_in | Supply voltage, 4 V to 5.5 V recommended operating range (absolute maximum 7 V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-150mil |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74CBT3257CDBQR - Footprint:
Package_SO:SSOP-16_5.3x6.2mm_P0.65mm - 3D model: SSOP-16-150mil (KiCad packages3D, STEP)
- 3D model files:
sn74cbt3257cdbqr-etched.step/sn74cbt3257cdbqr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74cbt3257cdbqr.step/sn74cbt3257cdbqr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (26 pp, sha256
37d4cf1233a4b4e3, retrieved 2026-09-30, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).