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SN74LS240DBR
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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+56@@ -0,0 +1,56 @@+# SN74LS240DBR++**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · SSOP-20-208mil++SN74LS240DBR from Texas Instruments, in a SSOP-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 | 1G | input | Channel 1 output enable; the datasheet describes these G inputs as symmetrical, active-low output-control inputs. |+| 2 | 1A1 | input | Channel 1 A-side data input 1; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 3 | 2Y4 | tri_state | Channel 2 Y-side three-state output 4; SN74LS24x devices are rated for IOL up to 24 mA. |+| 4 | 1A2 | input | Channel 1 A-side data input 2; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 5 | 2Y3 | tri_state | Channel 2 Y-side three-state output 3; SN74LS24x devices are rated for IOL up to 24 mA. |+| 6 | 1A3 | input | Channel 1 A-side data input 3; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 7 | 2Y2 | tri_state | Channel 2 Y-side three-state output 2; SN74LS24x devices are rated for IOL up to 24 mA. |+| 8 | 1A4 | input | Channel 1 A-side data input 4; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 9 | 2Y1 | tri_state | Channel 2 Y-side three-state output 1; SN74LS24x devices are rated for IOL up to 24 mA. |+| 10 | GND | power_in | Ground reference; the datasheet states voltages are referenced to the network ground terminal. |+| 11 | 2A1 | input | Channel 2 A-side data input 1; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 12 | 1Y4 | tri_state | Channel 1 Y-side three-state output 4; SN74LS24x devices are rated for IOL up to 24 mA. |+| 13 | 2A2 | input | Channel 2 A-side data input 2; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 14 | 1Y3 | tri_state | Channel 1 Y-side three-state output 3; SN74LS24x devices are rated for IOL up to 24 mA. |+| 15 | 2A3 | input | Channel 2 A-side data input 3; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 16 | 1Y2 | tri_state | Channel 1 Y-side three-state output 2; SN74LS24x devices are rated for IOL up to 24 mA. |+| 17 | 2A4 | input | Channel 2 A-side data input 4; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin. |+| 18 | 1Y1 | tri_state | Channel 1 Y-side three-state output 1; SN74LS24x devices are rated for IOL up to 24 mA. |+| 19 | 2G/2G | input | Channel 2 output enable; for the SN74LS240 this is the 2G control (the footnote gives 2G/2G for LS241/S241 and 2G for all other drivers), and the datasheet describes these G inputs as active-low output controls. |+| 20 | VCC | power_in | Power supply; SN74xS24x devices are specified for VCC of 4.75 V to 5.25 V (5 V nominal). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SSOP-20-208mil |+| Category | Logic |+| Pins | 20 |++## CAD (KiCad official)++- Symbol: `SN74LS240DBR`+- Footprint: `Package_SO:SSOP-20_5.3x7.2mm_P0.65mm`+- 3D model: SSOP-20-208mil (KiCad packages3D, STEP)+- 3D model files: `sn74ls240dbr-etched.step` / `sn74ls240dbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls240dbr.step` / `sn74ls240dbr.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/sn74ls241) (42 pp, sha256 `05f3258985319fe3`, 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/sn74ls240dbr-datasheet.pdf)
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the datasheet describes these G inputs as symmetrical, active-low output-control inputs."+ },+ {+ "number": "2",+ "name": "1A1",+ "type": "input",+ "description": "Channel 1 A-side data input 1; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "3",+ "name": "2Y4",+ "type": "tri_state",+ "description": "Channel 2 Y-side three-state output 4; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "4",+ "name": "1A2",+ "type": "input",+ "description": "Channel 1 A-side data input 2; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "5",+ "name": "2Y3",+ "type": "tri_state",+ "description": "Channel 2 Y-side three-state output 3; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "6",+ "name": "1A3",+ "type": "input",+ "description": "Channel 1 A-side data input 3; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "7",+ "name": "2Y2",+ "type": "tri_state",+ "description": "Channel 2 Y-side three-state output 2; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "8",+ "name": "1A4",+ "type": "input",+ "description": "Channel 1 A-side data input 4; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "9",+ "name": "2Y1",+ "type": "tri_state",+ "description": "Channel 2 Y-side three-state output 1; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "10",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference; the datasheet states voltages are referenced to the network ground terminal."+ },+ {+ "number": "11",+ "name": "2A1",+ "type": "input",+ "description": "Channel 2 A-side data input 1; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "12",+ "name": "1Y4",+ "type": "tri_state",+ "description": "Channel 1 Y-side three-state output 4; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "13",+ "name": "2A2",+ "type": "input",+ "description": "Channel 2 A-side data input 2; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "14",+ "name": "1Y3",+ "type": "tri_state",+ "description": "Channel 1 Y-side three-state output 3; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "15",+ "name": "2A3",+ "type": "input",+ "description": "Channel 2 A-side data input 3; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "16",+ "name": "1Y2",+ "type": "tri_state",+ "description": "Channel 1 Y-side three-state output 2; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "17",+ "name": "2A4",+ "type": "input",+ "description": "Channel 2 A-side data input 4; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."+ },+ {+ "number": "18",+ "name": "1Y1",+ "type": "tri_state",+ "description": "Channel 1 Y-side three-state output 1; SN74LS24x devices are rated for IOL up to 24 mA."+ },+ {+ "number": "19",+ "name": "2G/2G",+ "type": "input",+ "description": "Channel 2 output enable; for the SN74LS240 this is the 2G control (the footnote gives 2G/2G for LS241/S241 and 2G for all other drivers), and the datasheet describes these G inputs as active-low output controls."+ },+ {+ "number": "20",+ "name": "VCC",+ "type": "power_in",+ "description": "Power supply; SN74xS24x devices are specified for VCC of 4.75 V to 5.25 V (5 V nominal)."+ }+ ],+ "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 pin table on page 3 is shared by the DB, DW, J, N, NS and W packages. The DB (SSOP-20) pinout wa; Text extraction dropped the overbars on the output-enable names. Pin 1 is printed as 1G and pin 19 a; The printed pin table says type O for the Y outputs. I mapped them to KiCad tri_state because the da"+ ],+ "pages_sent": 13,+ "cost_usd": 0.0942,+ "at": "2026-10-08T16:06:46"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74ls241",+ "pages": 42,+ "sha256": "05f3258985319fe3",+ "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": "sn74ls240dbr.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 7.8,+ 7.2,+ 2.1+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "c9a01a276d0b4d9561efd58f2fcee56f52c1b6ab464ea7a0380cab4e87a924e6",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "sn74ls240dbr-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 7.8,+ 7.2,+ 2.1+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "906d04eae3702c6058c4095cf121e5c7ebdc53ca76002083c8d3d559454de314",+ "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]"+ }+}