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SN74CBT3257CDBQR
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Texas Instruments Signal Switches, Multiplexers, Decoders, SSOP-16-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# SN74CBT3257CDBQR++**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.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74cbt3257cdbqr.step` / `sn74cbt3257cdbqr.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/sn74cbt3257c) (26 pp, sha256 `37d4cf1233a4b4e3`, 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/sn74cbt3257cdbqr-datasheet.pdf)
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VIH 2 V min, VIL 0.8 V max, must be held at VCC or GND when unused."+ },+ {+ "number": "2",+ "name": "1B1",+ "type": "bidirectional",+ "description": "Channel 1 B1 port, connected to 1A when OE is low and S is low; supports 0 to 5.5 V data levels."+ },+ {+ "number": "3",+ "name": "1B2",+ "type": "bidirectional",+ "description": "Channel 1 B2 port, connected to 1A when OE is low and S is high; supports 0 to 5.5 V data levels."+ },+ {+ "number": "4",+ "name": "1A",+ "type": "bidirectional",+ "description": "Channel 1 A port, switched to 1B1 or 1B2 depending on S; high impedance when OE is high."+ },+ {+ "number": "5",+ "name": "2B1",+ "type": "bidirectional",+ "description": "Channel 2 B1 port, connected to 2A when OE is low and S is low; supports 0 to 5.5 V data levels."+ },+ {+ "number": "6",+ "name": "2B2",+ "type": "bidirectional",+ "description": "Channel 2 B2 port, connected to 2A when OE is low and S is high; supports 0 to 5.5 V data levels."+ },+ {+ "number": "7",+ "name": "2A",+ "type": "bidirectional",+ "description": "Channel 2 A port, switched to 2B1 or 2B2 depending on S; high impedance when OE is high."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference."+ },+ {+ "number": "9",+ "name": "3A",+ "type": "bidirectional",+ "description": "Channel 3 A port, switched to 3B1 or 3B2 depending on S; high impedance when OE is high."+ },+ {+ "number": "10",+ "name": "3B2",+ "type": "bidirectional",+ "description": "Channel 3 B2 port, connected to 3A when OE is low and S is high; supports 0 to 5.5 V data levels."+ },+ {+ "number": "11",+ "name": "3B1",+ "type": "bidirectional",+ "description": "Channel 3 B1 port, connected to 3A when OE is low and S is low; supports 0 to 5.5 V data levels."+ },+ {+ "number": "12",+ "name": "4A",+ "type": "bidirectional",+ "description": "Channel 4 A port, switched to 4B1 or 4B2 depending on S; high impedance when OE is high."+ },+ {+ "number": "13",+ "name": "4B2",+ "type": "bidirectional",+ "description": "Channel 4 B2 port, connected to 4A when OE is low and S is high; supports 0 to 5.5 V data levels."+ },+ {+ "number": "14",+ "name": "4B1",+ "type": "bidirectional",+ "description": "Channel 4 B1 port, connected to 4A when OE is low and S is low; supports 0 to 5.5 V data levels."+ },+ {+ "number": "15",+ "name": "OE",+ "type": "input",+ "description": "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."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply voltage, 4 V to 5.5 V recommended operating range (absolute maximum 7 V)."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [],+ "pages_sent": 26,+ "cost_usd": 0.1667,+ "at": "2026-09-30T01:21:06"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74cbt3257c",+ "pages": 26,+ "sha256": "37d4cf1233a4b4e3",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 16,+ "described": 16,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}