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SN74CBT3253CDBR
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Texas Instruments Signal Switches, Multiplexers, Decoders, SSOP-16-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+50@@ -0,0 +1,50 @@+# 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)
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when high, a high-impedance state exists between the 1A and 1B ports."+ },+ {+ "number": "2",+ "name": "S1",+ "type": "input",+ "description": "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."+ },+ {+ "number": "3",+ "name": "1B4",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "4",+ "name": "1B3",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "5",+ "name": "1B2",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "6",+ "name": "1B1",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "7",+ "name": "1A",+ "type": "bidirectional",+ "description": "Multiplexer 1 common A data port, connected to one of 1B1-1B4 as selected by S1 and S0 when 1OE is low."+ },+ {+ "number": "9",+ "name": "2A",+ "type": "bidirectional",+ "description": "Multiplexer 2 common A data port, connected to one of 2B1-2B4 as selected by S1 and S0 when 2OE is low."+ },+ {+ "number": "10",+ "name": "2B1",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "11",+ "name": "2B2",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "12",+ "name": "2B3",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "13",+ "name": "2B4",+ "type": "bidirectional",+ "description": "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."+ },+ {+ "number": "14",+ "name": "S0",+ "type": "input",+ "description": "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."+ },+ {+ "number": "15",+ "name": "2OE",+ "type": "input",+ "description": "Output-enable input for multiplexer 2, active low; when high, a high-impedance state exists between the 2A and 2B ports."+ }+ ],+ "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": [+ "extractor flagged: Pins 8 (GND) and 16 (VCC) are not explicitly labeled in the logic diagram; assignments are based on ",+ "1/16 pins cited to the wrong page (name found elsewhere): ['16:VCC@p3']"+ ],+ "pages_sent": 26,+ "cost_usd": 0.176,+ "at": "2026-09-30T01:33:41"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74cbt3253c",+ "pages": 26,+ "sha256": "89e75930549ef68c",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 14,+ "described": 14,+ "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]"+ }+}