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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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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 (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