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SN74AHC245DWR
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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 @@+# SN74AHC245DWR++**Texas Instruments** · Buffer/Driver/Transceiver · SOIC-20-300mil++SN74AHC245DWR 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 that sets whether data transfers from A to B or from B to A; the datasheet specifies inputs (OE or DIR) up to 5.5 V. |+| 2 | A1 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 3 | A2 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 4 | A3 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 5 | A4 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 6 | A5 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 7 | A6 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 8 | A7 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 9 | A8 | bidirectional | A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 10 | GND | power_in | Ground reference pin for the device. |+| 11 | B8 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 12 | B7 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 13 | B6 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 14 | B5 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 15 | B4 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 16 | B3 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 17 | B2 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 18 | B1 | bidirectional | B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V. |+| 19 | OE | input | Output enable control; when set it disables the output section of the I/O ports, the input sections stay active, so the I/O pins must not float. |+| 20 | VCC | power_in | Supply pin; operating range 2 V to 5.5 V, with a 0.1 µF bypass capacitor placed close to the pin recommended. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-20-300mil |+| Category | Logic ICs |+| Pins | 20 |++## CAD (KiCad official)++- Symbol: `SN74AHC245DWR`+- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`+- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)+- 3D model files: `sn74ahc245dwr-etched.step` / `sn74ahc245dwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ahc245dwr.step` / `sn74ahc245dwr.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/sn74ahc245) (43 pp, sha256 `96c121e7cdb9f118`, retrieved 2026-10-07, 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-haiku-5-5` (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/sn74ahc245dwr-datasheet.pdf)
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Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "logic ics",+ "sn74ahc245dwr",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "sn74ahc245dwr.kicad_sym",+ "sn74ahc245dwr.kicad_mod",+ "sn74ahc245dwr.glb",+ "sn74ahc245dwr.step",+ "sn74ahc245dwr.lbr",+ "docs/hero.png",+ "docs/sn74ahc245dwr-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "sn74ahc245dwr-hero.glb",+ "sn74ahc245dwr-hero.overlay.json"+ ],+ "component": {+ "mpn": "SN74AHC245DWR",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-20-300mil",+ "pin_count": 20,+ "category": "Logic ICs",+ "subcategory": "Buffer/Driver/Transceiver",+ "datasheet": "https://www.ti.com/cn/lit/gpn/sn74ahc245",+ "parts": {+ "symbol": "sn74ahc245dwr.kicad_sym",+ "footprint": "sn74ahc245dwr.kicad_mod",+ "model_3d": "sn74ahc245dwr-hero.glb",+ "model_3d_plain": "sn74ahc245dwr.glb",+ "model_3d_step": "sn74ahc245dwr-etched.step",+ "model_3d_step_plain": "sn74ahc245dwr.step",+ "lbr": "sn74ahc245dwr.lbr"+ },+ "distributor_links": {+ "lcsc": "C132986",+ "digikey": "296-37411-2-ND",+ "mouser": "595-SN74AHC245DWR"+ },+ "distributor_check": {+ "checked_at": "2026-10-07T21:40:28Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "296-37411-2-ND",+ "status": "found",+ "lifecycle": "Active"+ },+ "mouser": {+ "pn": "595-SN74AHC245DWR",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "DIR",+ "type": "input",+ "description": "Direction control input that sets whether data transfers from A to B or from B to A; the datasheet specifies inputs (OE or DIR) up to 5.5 V."+ },+ {+ "number": "2",+ "name": "A1",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "3",+ "name": "A2",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "4",+ "name": "A3",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "5",+ "name": "A4",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "6",+ "name": "A5",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "7",+ "name": "A6",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "8",+ "name": "A7",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "9",+ "name": "A8",+ "type": "bidirectional",+ "description": "A-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "10",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference pin for the device."+ },+ {+ "number": "11",+ "name": "B8",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "12",+ "name": "B7",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "13",+ "name": "B6",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "14",+ "name": "B5",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "15",+ "name": "B4",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "16",+ "name": "B3",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "17",+ "name": "B2",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "18",+ "name": "B1",+ "type": "bidirectional",+ "description": "B-side bidirectional data input/output; output drive is limited to VCC, with IOH of -8 mA and IOL of 8 mA at VCC = 5 V ±0.5 V."+ },+ {+ "number": "19",+ "name": "OE",+ "type": "input",+ "description": "Output enable control; when set it disables the output section of the I/O ports, the input sections stay active, so the I/O pins must not float."+ },+ {+ "number": "20",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply pin; operating range 2 V to 5.5 V, with a 0.1 µF bypass capacitor placed close to the pin recommended."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-5-5",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Table 4-1 description column for the A-side pins is inconsistent with the pin names: A2 (pin 3) is d; Table 4-1 lists DIR and OE as type I/O. They are control inputs (the datasheet gives their input vol; The active level of OE is not stated in the provided pages; the function table (section 7.4, page 10"+ ],+ "pages_sent": 15,+ "cost_usd": 0.0924,+ "at": "2026-10-07T21:40:05"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74ahc245",+ "pages": 43,+ "sha256": "96c121e7cdb9f118",+ "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": "sn74ahc245dwr.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": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "sn74ahc245dwr-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": "d28c74666afac9fff8e4df5f167859f4ce884e8f83f4224432eb13c3471fe569",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}