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SN74F240DWR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+56@@ -0,0 +1,56 @@+# SN74F240DWR++**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · SOIC-20++SN74F240DWR from Texas Instruments, in a SOIC-20. 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 | Active-low output enable for buffer section 1; when low the 1Y outputs follow the 1A inputs, and when high the 1Y outputs are in the high-impedance state. |+| 2 | 1A1 | input | Data input 1A1 of the first 4-bit buffer section, passed to output 1Y1 when 1OE is low. |+| 3 | 2Y4 | tri_state | Buffered 3-state output 2Y4 of the second buffer section, high-impedance when 2OE is high. |+| 4 | 1A2 | input | Data input 1A2 of the first buffer section, passed to output 1Y2 when 1OE is low. |+| 5 | 2Y3 | tri_state | Buffered 3-state output 2Y3 of the second buffer section, high-impedance when 2OE is high. |+| 6 | 1A3 | input | Data input 1A3 of the first buffer section, passed to output 1Y3 when 1OE is low. |+| 7 | 2Y2 | tri_state | Buffered 3-state output 2Y2 of the second buffer section, high-impedance when 2OE is high. |+| 8 | 1A4 | input | Data input 1A4 of the first buffer section, passed to output 1Y4 when 1OE is low. |+| 9 | 2Y1 | tri_state | Buffered 3-state output 2Y1 of the second buffer section, high-impedance when 2OE is high. |+| 10 | GND | power_in | Ground reference pin for the device. |+| 11 | 2A1 | input | Data input 2A1 of the second buffer section, passed to output 2Y1 when 2OE is low. |+| 12 | 1Y4 | tri_state | Buffered 3-state output 1Y4 of the first buffer section, high-impedance when 1OE is high. |+| 13 | 2A2 | input | Data input 2A2 of the second buffer section, passed to output 2Y2 when 2OE is low. |+| 14 | 1Y3 | tri_state | Buffered 3-state output 1Y3 of the first buffer section, high-impedance when 1OE is high. |+| 15 | 2A3 | input | Data input 2A3 of the second buffer section, passed to output 2Y3 when 2OE is low. |+| 16 | 1Y2 | tri_state | Buffered 3-state output 1Y2 of the first buffer section, high-impedance when 1OE is high. |+| 17 | 2A4 | input | Data input 2A4 of the second buffer section, passed to output 2Y4 when 2OE is low. |+| 18 | 1Y1 | tri_state | Buffered 3-state output 1Y1 of the first buffer section, high-impedance when 1OE is high. |+| 19 | 2OE | input | Active-low output enable for buffer section 2; when low the 2Y outputs follow the 2A inputs, and when high the 2Y outputs are in the high-impedance state. |+| 20 | VCC | power_in | Positive supply pin; recommended supply range is 4.5 V to 5.5 V (5 V nominal) for the SN74F240. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-20 |+| Category | Logic |+| Pins | 20 |++## CAD (KiCad official)++- Symbol: `SN74F240DWR`+- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`+- 3D model: SOIC-20 (KiCad packages3D, STEP)+- 3D model files: `sn74f240dwr-etched.step` / `sn74f240dwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74f240dwr.step` / `sn74f240dwr.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/sn54f240) (19 pp, sha256 `4e091c0b5e5b11a7`, retrieved 2026-10-08, tier: lcsc)+- **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/sn74f240dwr-datasheet.pdf)
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when low the 1Y outputs follow the 1A inputs, and when high the 1Y outputs are in the high-impedance state."+ },+ {+ "number": "2",+ "name": "1A1",+ "type": "input",+ "description": "Data input 1A1 of the first 4-bit buffer section, passed to output 1Y1 when 1OE is low."+ },+ {+ "number": "3",+ "name": "2Y4",+ "type": "tri_state",+ "description": "Buffered 3-state output 2Y4 of the second buffer section, high-impedance when 2OE is high."+ },+ {+ "number": "4",+ "name": "1A2",+ "type": "input",+ "description": "Data input 1A2 of the first buffer section, passed to output 1Y2 when 1OE is low."+ },+ {+ "number": "5",+ "name": "2Y3",+ "type": "tri_state",+ "description": "Buffered 3-state output 2Y3 of the second buffer section, high-impedance when 2OE is high."+ },+ {+ "number": "6",+ "name": "1A3",+ "type": "input",+ "description": "Data input 1A3 of the first buffer section, passed to output 1Y3 when 1OE is low."+ },+ {+ "number": "7",+ "name": "2Y2",+ "type": "tri_state",+ "description": "Buffered 3-state output 2Y2 of the second buffer section, high-impedance when 2OE is high."+ },+ {+ "number": "8",+ "name": "1A4",+ "type": "input",+ "description": "Data input 1A4 of the first buffer section, passed to output 1Y4 when 1OE is low."+ },+ {+ "number": "9",+ "name": "2Y1",+ "type": "tri_state",+ "description": "Buffered 3-state output 2Y1 of the second buffer section, high-impedance when 2OE is high."+ },+ {+ "number": "10",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference pin for the device."+ },+ {+ "number": "11",+ "name": "2A1",+ "type": "input",+ "description": "Data input 2A1 of the second buffer section, passed to output 2Y1 when 2OE is low."+ },+ {+ "number": "12",+ "name": "1Y4",+ "type": "tri_state",+ "description": "Buffered 3-state output 1Y4 of the first buffer section, high-impedance when 1OE is high."+ },+ {+ "number": "13",+ "name": "2A2",+ "type": "input",+ "description": "Data input 2A2 of the second buffer section, passed to output 2Y2 when 2OE is low."+ },+ {+ "number": "14",+ "name": "1Y3",+ "type": "tri_state",+ "description": "Buffered 3-state output 1Y3 of the first buffer section, high-impedance when 1OE is high."+ },+ {+ "number": "15",+ "name": "2A3",+ "type": "input",+ "description": "Data input 2A3 of the second buffer section, passed to output 2Y3 when 2OE is low."+ },+ {+ "number": "16",+ "name": "1Y2",+ "type": "tri_state",+ "description": "Buffered 3-state output 1Y2 of the first buffer section, high-impedance when 1OE is high."+ },+ {+ "number": "17",+ "name": "2A4",+ "type": "input",+ "description": "Data input 2A4 of the second buffer section, passed to output 2Y4 when 2OE is low."+ },+ {+ "number": "18",+ "name": "1Y1",+ "type": "tri_state",+ "description": "Buffered 3-state output 1Y1 of the first buffer section, high-impedance when 1OE is high."+ },+ {+ "number": "19",+ "name": "2OE",+ "type": "input",+ "description": "Active-low output enable for buffer section 2; when low the 2Y outputs follow the 2A inputs, and when high the 2Y outputs are in the high-impedance state."+ },+ {+ "number": "20",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive supply pin; recommended supply range is 4.5 V to 5.5 V (5 V nominal) for the SN74F240."+ }+ ],+ "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: The DW (SOIC-20) pinout is taken from the page 1 TOP VIEW labelled 'SN74F240 ... DB, DW, OR N PACKAG"+ ],+ "pages_sent": 19,+ "cost_usd": 0.0765,+ "at": "2026-10-08T01:41:09"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn54f240",+ "pages": 19,+ "sha256": "4e091c0b5e5b11a7",+ "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": "sn74f240dwr.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": "sn74f240dwr-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": "845714bf6ceefc1206378069de631ecd23a1d2ae9e3b2c459bf9a2b159bb14df",+ "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]"+ }+}