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SN74HCT240NSR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+57@@ -0,0 +1,57 @@+# SN74HCT240NSR++**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · SOIC-20-208mil++SN74HCT240NSR from Texas Instruments, in a SOIC-20-208mil. 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 1 input (active low); controls tri-state outputs of section 1 buffers (1Y1-1Y4). |+| 2 | 1A1 | input | Input A1 for section 1 buffer; inverted output appears on 1Y1 when 1OE is low. |+| 3 | 2Y4 | tri_state | Tri-state output Y4 for section 2; drives inverted version of input 2A4 when 2OE is low, otherwise high impedance. |+| 4 | 1A2 | input | Input A2 for section 1 buffer; inverted output appears on 1Y2 when 1OE is low. |+| 5 | 2Y3 | tri_state | Tri-state output Y3 for section 2; drives inverted version of input 2A3 when 2OE is low, otherwise high impedance. |+| 6 | 1A3 | input | Input A3 for section 1 buffer; inverted output appears on 1Y3 when 1OE is low. |+| 7 | 2Y2 | tri_state | Tri-state output Y2 for section 2; drives inverted version of input 2A2 when 2OE is low, otherwise high impedance. |+| 8 | 1A4 | input | Input A4 for section 1 buffer; inverted output appears on 1Y4 when 1OE is low. |+| 9 | 2Y1 | tri_state | Tri-state output Y1 for section 2; drives inverted version of input 2A1 when 2OE is low, otherwise high impedance. |+| 10 | GND | power_in | Ground reference pin. |+| 11 | 2A1 | input | Input A1 for section 2 buffer; inverted output appears on 2Y1 when 2OE is low. |+| 12 | 1Y4 | tri_state | Tri-state output Y4 for section 1; drives inverted version of input 1A4 when 1OE is low, otherwise high impedance. |+| 13 | 2A2 | input | Input A2 for section 2 buffer; inverted output appears on 2Y2 when 2OE is low. |+| 14 | 1Y3 | tri_state | Tri-state output Y3 for section 1; drives inverted version of input 1A3 when 1OE is low, otherwise high impedance. |+| 15 | 2A3 | input | Input A3 for section 2 buffer; inverted output appears on 2Y3 when 2OE is low. |+| 16 | 1Y2 | tri_state | Tri-state output Y2 for section 1; drives inverted version of input 1A2 when 1OE is low, otherwise high impedance. |+| 17 | 2A4 | input | Input A4 for section 2 buffer; inverted output appears on 2Y4 when 2OE is low. |+| 18 | 1Y1 | tri_state | Tri-state output Y1 for section 1; drives inverted version of input 1A1 when 1OE is low, otherwise high impedance. |+| 19 | 2OE | input | Output Enable 2 input (active low); controls tri-state outputs of section 2 buffers (2Y1-2Y4). |+| 20 | VCC | power_in | Positive power supply pin; nominal 5V with operating range 4.5V to 5.5V per section 4.2. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-20-208mil |+| Category | Logic |+| Pins | 20 |++## CAD (KiCad official)++- Symbol: `SN74HCT240NSR`+- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`+- 3D model: SOIC-20-208mil (KiCad packages3D, STEP)+- 3D model files: `sn74hct240nsr-etched.step` / `sn74hct240nsr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hct240nsr.step` / `sn74hct240nsr.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/sn74hct240) (30 pp, sha256 `898d3fff8f0abec6`, retrieved 2026-09-27, 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 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/sn74hct240nsr-datasheet.pdf)
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controls tri-state outputs of section 1 buffers (1Y1-1Y4)."+ },+ {+ "number": "2",+ "name": "1A1",+ "type": "input",+ "description": "Input A1 for section 1 buffer; inverted output appears on 1Y1 when 1OE is low."+ },+ {+ "number": "3",+ "name": "2Y4",+ "type": "tri_state",+ "description": "Tri-state output Y4 for section 2; drives inverted version of input 2A4 when 2OE is low, otherwise high impedance."+ },+ {+ "number": "4",+ "name": "1A2",+ "type": "input",+ "description": "Input A2 for section 1 buffer; inverted output appears on 1Y2 when 1OE is low."+ },+ {+ "number": "5",+ "name": "2Y3",+ "type": "tri_state",+ "description": "Tri-state output Y3 for section 2; drives inverted version of input 2A3 when 2OE is low, otherwise high impedance."+ },+ {+ "number": "6",+ "name": "1A3",+ "type": "input",+ "description": "Input A3 for section 1 buffer; inverted output appears on 1Y3 when 1OE is low."+ },+ {+ "number": "7",+ "name": "2Y2",+ "type": "tri_state",+ "description": "Tri-state output Y2 for section 2; drives inverted version of input 2A2 when 2OE is low, otherwise high impedance."+ },+ {+ "number": "8",+ "name": "1A4",+ "type": "input",+ "description": "Input A4 for section 1 buffer; inverted output appears on 1Y4 when 1OE is low."+ },+ {+ "number": "9",+ "name": "2Y1",+ "type": "tri_state",+ "description": "Tri-state output Y1 for section 2; drives inverted version of input 2A1 when 2OE is low, otherwise high impedance."+ },+ {+ "number": "10",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference pin."+ },+ {+ "number": "11",+ "name": "2A1",+ "type": "input",+ "description": "Input A1 for section 2 buffer; inverted output appears on 2Y1 when 2OE is low."+ },+ {+ "number": "12",+ "name": "1Y4",+ "type": "tri_state",+ "description": "Tri-state output Y4 for section 1; drives inverted version of input 1A4 when 1OE is low, otherwise high impedance."+ },+ {+ "number": "13",+ "name": "2A2",+ "type": "input",+ "description": "Input A2 for section 2 buffer; inverted output appears on 2Y2 when 2OE is low."+ },+ {+ "number": "14",+ "name": "1Y3",+ "type": "tri_state",+ "description": "Tri-state output Y3 for section 1; drives inverted version of input 1A3 when 1OE is low, otherwise high impedance."+ },+ {+ "number": "15",+ "name": "2A3",+ "type": "input",+ "description": "Input A3 for section 2 buffer; inverted output appears on 2Y3 when 2OE is low."+ },+ {+ "number": "16",+ "name": "1Y2",+ "type": "tri_state",+ "description": "Tri-state output Y2 for section 1; drives inverted version of input 1A2 when 1OE is low, otherwise high impedance."+ },+ {+ "number": "17",+ "name": "2A4",+ "type": "input",+ "description": "Input A4 for section 2 buffer; inverted output appears on 2Y4 when 2OE is low."+ },+ {+ "number": "18",+ "name": "1Y1",+ "type": "tri_state",+ "description": "Tri-state output Y1 for section 1; drives inverted version of input 1A1 when 1OE is low, otherwise high impedance."+ },+ {+ "number": "19",+ "name": "2OE",+ "type": "input",+ "description": "Output Enable 2 input (active low); controls tri-state outputs of section 2 buffers (2Y1-2Y4)."+ },+ {+ "number": "20",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive power supply pin; nominal 5V with operating range 4.5V to 5.5V per section 4.2."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.2",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.2",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-4-6",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Package designation mismatch: user specified package hint 'SOIC-20-208mil', but MPN SN74HCT240NSR is"+ ],+ "pages_sent": 30,+ "cost_usd": 0.2851,+ "at": "2026-09-27T08:58:11"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74hct240",+ "pages": 30,+ "sha256": "898d3fff8f0abec6",+ "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"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}