component
CD40257BM
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# CD40257BM++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16++CD40257BM from Texas Instruments, in a SOIC-16. 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 | INPUT SELECT | input | Select input: low passes the A inputs to the outputs, high passes the B inputs. |+| 2 | A1 | input | Channel 1 data input A, routed to D1 when select is low. |+| 3 | B1 | input | Channel 1 data input B, routed to D1 when select is high. |+| 4 | D1 | tri_state | Channel 1 three-state output, high impedance when output disable is high. |+| 5 | A2 | input | Channel 2 data input A, routed to D2 when select is low. |+| 6 | B2 | input | Channel 2 data input B, routed to D2 when select is high. |+| 7 | D2 | tri_state | Channel 2 three-state output, high impedance when output disable is high. |+| 8 | VSS | power_in | Ground (negative supply) reference terminal for all voltages. |+| 9 | D3 | tri_state | Channel 3 three-state output, high impedance when output disable is high. |+| 10 | B3 | input | Channel 3 data input B, routed to D3 when select is high. |+| 11 | A3 | input | Channel 3 data input A, routed to D3 when select is low. |+| 12 | D4 | tri_state | Channel 4 three-state output, high impedance when output disable is high. |+| 13 | B4 | input | Channel 4 data input B, routed to D4 when select is high. |+| 14 | A4 | input | Channel 4 data input A, routed to D4 when select is low. |+| 15 | OUTPUT DISABLE | input | 3-state output disable: high puts all outputs in high impedance, low enables them. |+| 16 | VDD | power_in | Positive supply, recommended 3 V to 18 V, absolute maximum -0.5 V to +20 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `CD40257BM`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)+- 3D model files: `cd40257bm-etched.step` / `cd40257bm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd40257bm.step` / `cd40257bm.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/cd40257b) (10 pp, sha256 `d9965b2fa9121640`, retrieved 2026-10-05, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/cd40257bm-datasheet.pdf)
page.jsonadded+208@@ -0,0 +1,208 @@+{+ "slug": "cd40257bm",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "logic",+ "cd40257bm",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "cd40257bm.kicad_sym",+ "cd40257bm.kicad_mod",+ "cd40257bm.glb",+ "cd40257bm.step",+ "cd40257bm.lbr",+ "docs/hero.png",+ "docs/cd40257bm-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "cd40257bm-hero.glb",+ "cd40257bm-hero.overlay.json"+ ],+ "component": {+ "mpn": "CD40257BM",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-16",+ "pin_count": 16,+ "category": "Logic",+ "subcategory": "Signal Switches, Multiplexers, Decoders",+ "datasheet": "https://www.ti.com/cn/lit/gpn/cd40257b",+ "parts": {+ "symbol": "cd40257bm.kicad_sym",+ "footprint": "cd40257bm.kicad_mod",+ "model_3d": "cd40257bm-hero.glb",+ "model_3d_plain": "cd40257bm.glb",+ "model_3d_step": "cd40257bm-etched.step",+ "model_3d_step_plain": "cd40257bm.step",+ "lbr": "cd40257bm.lbr"+ },+ "distributor_links": {+ "lcsc": 2862216,+ "digikey": "2156-CD40257BM-ND",+ "mouser": "595-CD40257BM"+ },+ "distributor_check": {+ "checked_at": "2026-10-05T19:55:16Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "2156-CD40257BM-ND",+ "status": "found"+ },+ "mouser": {+ "pn": "595-CD40257BM",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "INPUT SELECT",+ "type": "input",+ "description": "Select input: low passes the A inputs to the outputs, high passes the B inputs."+ },+ {+ "number": "2",+ "name": "A1",+ "type": "input",+ "description": "Channel 1 data input A, routed to D1 when select is low."+ },+ {+ "number": "3",+ "name": "B1",+ "type": "input",+ "description": "Channel 1 data input B, routed to D1 when select is high."+ },+ {+ "number": "4",+ "name": "D1",+ "type": "tri_state",+ "description": "Channel 1 three-state output, high impedance when output disable is high."+ },+ {+ "number": "5",+ "name": "A2",+ "type": "input",+ "description": "Channel 2 data input A, routed to D2 when select is low."+ },+ {+ "number": "6",+ "name": "B2",+ "type": "input",+ "description": "Channel 2 data input B, routed to D2 when select is high."+ },+ {+ "number": "7",+ "name": "D2",+ "type": "tri_state",+ "description": "Channel 2 three-state output, high impedance when output disable is high."+ },+ {+ "number": "8",+ "name": "VSS",+ "type": "power_in",+ "description": "Ground (negative supply) reference terminal for all voltages."+ },+ {+ "number": "9",+ "name": "D3",+ "type": "tri_state",+ "description": "Channel 3 three-state output, high impedance when output disable is high."+ },+ {+ "number": "10",+ "name": "B3",+ "type": "input",+ "description": "Channel 3 data input B, routed to D3 when select is high."+ },+ {+ "number": "11",+ "name": "A3",+ "type": "input",+ "description": "Channel 3 data input A, routed to D3 when select is low."+ },+ {+ "number": "12",+ "name": "D4",+ "type": "tri_state",+ "description": "Channel 4 three-state output, high impedance when output disable is high."+ },+ {+ "number": "13",+ "name": "B4",+ "type": "input",+ "description": "Channel 4 data input B, routed to D4 when select is high."+ },+ {+ "number": "14",+ "name": "A4",+ "type": "input",+ "description": "Channel 4 data input A, routed to D4 when select is low."+ },+ {+ "number": "15",+ "name": "OUTPUT DISABLE",+ "type": "input",+ "description": "3-state output disable: high puts all outputs in high impedance, low enables them."+ },+ {+ "number": "16",+ "name": "VDD",+ "type": "power_in",+ "description": "Positive supply, recommended 3 V to 18 V, absolute maximum -0.5 V to +20 V."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-sonnet-5-5",+ "primary_mode": "text+vision",+ "consensus_model": "claude-opus-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Pin numbers were read from the functional diagram on page 1, which is a low-quality scan. The datash",+ "vision extraction: provenance cannot be text-verified; needs consensus"+ ],+ "pages_sent": 10,+ "cost_usd": 0.2837,+ "at": "2026-10-05T19:55:00"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/cd40257b",+ "pages": 10,+ "sha256": "d9965b2fa9121640",+ "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]"+ }+}