component
CD74HCT640M
Public Made by Adomby adom
Texas Instruments Buffer/Driver/Transceiver, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+57@@ -0,0 +1,57 @@+# CD74HCT640M++**Texas Instruments** · Buffer/Driver/Transceiver · SOIC-20-300mil++CD74HCT640M from Texas Instruments, in a SOIC-20-300mil. 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 | DIR | input | Direction control input: selects A-to-B or B-to-A data flow; HCT input levels VIL 0.8V max, VIH 2V min. |+| 2 | A0 | bidirectional | A-bus I/O 0 (three-state); output is inverted version of B0 input when enabled. |+| 3 | A1 | bidirectional | A-bus I/O 1 (three-state); output is inverted version of B1 input when enabled. |+| 4 | A2 | bidirectional | A-bus I/O 2 (three-state); output is inverted version of B2 input when enabled. |+| 5 | A3 | bidirectional | A-bus I/O 3 (three-state); output is inverted version of B3 input when enabled. |+| 6 | A4 | bidirectional | A-bus I/O 4 (three-state); output is inverted version of B4 input when enabled. |+| 7 | A5 | bidirectional | A-bus I/O 5 (three-state); output is inverted version of B5 input when enabled. |+| 8 | A6 | bidirectional | A-bus I/O 6 (three-state); output is inverted version of B6 input when enabled. |+| 9 | A7 | bidirectional | A-bus I/O 7 (three-state); output is inverted version of B7 input when enabled. |+| 10 | GND | power_in | Ground reference (0V). |+| 11 | B7 | bidirectional | B-bus I/O 7 (three-state); output is inverted version of A7 input when enabled. |+| 12 | B6 | bidirectional | B-bus I/O 6 (three-state); output is inverted version of A6 input when enabled. |+| 13 | B5 | bidirectional | B-bus I/O 5 (three-state); output is inverted version of A5 input when enabled. |+| 14 | B4 | bidirectional | B-bus I/O 4 (three-state); output is inverted version of A4 input when enabled. |+| 15 | B3 | bidirectional | B-bus I/O 3 (three-state); output is inverted version of A3 input when enabled. |+| 16 | B2 | bidirectional | B-bus I/O 2 (three-state); output is inverted version of A2 input when enabled. |+| 17 | B1 | bidirectional | B-bus I/O 1 (three-state); output is inverted version of A1 input when enabled. |+| 18 | B0 | bidirectional | B-bus I/O 0 (three-state); output is inverted version of A0 input when enabled. |+| 19 | OE | input | Active-low output enable: low enables outputs, high puts A and B ports in high impedance. |+| 20 | VCC | power_in | Supply voltage; 4.5V to 5.5V for HCT types, with 0.1 µF bypass capacitor recommended. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-20-300mil |+| Category | Logic ICs |+| Pins | 20 |++## CAD (KiCad official)++- Symbol: `CD74HCT640M`+- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`+- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)+- 3D model files: `cd74hct640m-etched.step` / `cd74hct640m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd74hct640m.step` / `cd74hct640m.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/cd74hct640) (19 pp, sha256 `21ee67f9e5d6228b`, retrieved 2026-10-08, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/cd74hct640m-datasheet.pdf)
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HCT input levels VIL 0.8V max, VIH 2V min."+ },+ {+ "number": "2",+ "name": "A0",+ "type": "bidirectional",+ "description": "A-bus I/O 0 (three-state); output is inverted version of B0 input when enabled."+ },+ {+ "number": "3",+ "name": "A1",+ "type": "bidirectional",+ "description": "A-bus I/O 1 (three-state); output is inverted version of B1 input when enabled."+ },+ {+ "number": "4",+ "name": "A2",+ "type": "bidirectional",+ "description": "A-bus I/O 2 (three-state); output is inverted version of B2 input when enabled."+ },+ {+ "number": "5",+ "name": "A3",+ "type": "bidirectional",+ "description": "A-bus I/O 3 (three-state); output is inverted version of B3 input when enabled."+ },+ {+ "number": "6",+ "name": "A4",+ "type": "bidirectional",+ "description": "A-bus I/O 4 (three-state); output is inverted version of B4 input when enabled."+ },+ {+ "number": "7",+ "name": "A5",+ "type": "bidirectional",+ "description": "A-bus I/O 5 (three-state); output is inverted version of B5 input when enabled."+ },+ {+ "number": "8",+ "name": "A6",+ "type": "bidirectional",+ "description": "A-bus I/O 6 (three-state); output is inverted version of B6 input when enabled."+ },+ {+ "number": "9",+ "name": "A7",+ "type": "bidirectional",+ "description": "A-bus I/O 7 (three-state); output is inverted version of B7 input when enabled."+ },+ {+ "number": "10",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference (0V)."+ },+ {+ "number": "11",+ "name": "B7",+ "type": "bidirectional",+ "description": "B-bus I/O 7 (three-state); output is inverted version of A7 input when enabled."+ },+ {+ "number": "12",+ "name": "B6",+ "type": "bidirectional",+ "description": "B-bus I/O 6 (three-state); output is inverted version of A6 input when enabled."+ },+ {+ "number": "13",+ "name": "B5",+ "type": "bidirectional",+ "description": "B-bus I/O 5 (three-state); output is inverted version of A5 input when enabled."+ },+ {+ "number": "14",+ "name": "B4",+ "type": "bidirectional",+ "description": "B-bus I/O 4 (three-state); output is inverted version of A4 input when enabled."+ },+ {+ "number": "15",+ "name": "B3",+ "type": "bidirectional",+ "description": "B-bus I/O 3 (three-state); output is inverted version of A3 input when enabled."+ },+ {+ "number": "16",+ "name": "B2",+ "type": "bidirectional",+ "description": "B-bus I/O 2 (three-state); output is inverted version of A2 input when enabled."+ },+ {+ "number": "17",+ "name": "B1",+ "type": "bidirectional",+ "description": "B-bus I/O 1 (three-state); output is inverted version of A1 input when enabled."+ },+ {+ "number": "18",+ "name": "B0",+ "type": "bidirectional",+ "description": "B-bus I/O 0 (three-state); output is inverted version of A0 input when enabled."+ },+ {+ "number": "19",+ "name": "OE",+ "type": "input",+ "description": "Active-low output enable: low enables outputs, high puts A and B ports in high impedance."+ },+ {+ "number": "20",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply voltage; 4.5V to 5.5V for HCT types, with 0.1 µF bypass capacitor recommended."+ }+ ],+ "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: Package hint SOIC-20-300mil; datasheet names the package DW (SOIC-20, body width 7.4-7.6 mm, MS-013)",+ "vision extraction: provenance cannot be text-verified; needs consensus"+ ],+ "pages_sent": 19,+ "cost_usd": 0.4361,+ "at": "2026-10-08T14:41:52"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/cd74hct640",+ "pages": 19,+ "sha256": "21ee67f9e5d6228b",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 20,+ "described": 20,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "cd74hct640m.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 10.3,+ 12.8,+ 2.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "59a10b341e6972b31d81802a048060326da627d8b92dcf4263064f4f62ec808e",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "cd74hct640m-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 10.3,+ 12.8,+ 2.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "d641ddf4de1ef2e4ce0d95a0416ed3199420df45817897e585361195ab835cb6",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}