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SN74LS240DBR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN74LS240DBR
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ls240dbr.step/sn74ls240dbr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (42 pp, sha256
05f3258985319fe3, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).