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SN74ALS645A-1NSR

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74ALS645A-1NSR

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOP-20-208mil

SN74ALS645A-1NSR from Texas Instruments, in a SOP-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 DIR input Direction-control input: high transmits A data to the B bus, low transmits B data to the A bus (when OE is low).
2 A1 bidirectional A-bus I/O port 1 with 3-state output; I/O ports tolerate up to 5.5 V.
3 A2 bidirectional A-bus I/O port 2 with 3-state output; I/O ports tolerate up to 5.5 V.
4 A3 bidirectional A-bus I/O port 3 with 3-state output; I/O ports tolerate up to 5.5 V.
5 A4 bidirectional A-bus I/O port 4 with 3-state output; I/O ports tolerate up to 5.5 V.
6 A5 bidirectional A-bus I/O port 5 with 3-state output; I/O ports tolerate up to 5.5 V.
7 A6 bidirectional A-bus I/O port 6 with 3-state output; I/O ports tolerate up to 5.5 V.
8 A7 bidirectional A-bus I/O port 7 with 3-state output; I/O ports tolerate up to 5.5 V.
9 A8 bidirectional A-bus I/O port 8 with 3-state output; I/O ports tolerate up to 5.5 V.
10 GND power_in Ground reference.
11 B8 bidirectional B-bus I/O port 8 with 3-state output; I/O ports tolerate up to 5.5 V.
12 B7 bidirectional B-bus I/O port 7 with 3-state output; I/O ports tolerate up to 5.5 V.
13 B6 bidirectional B-bus I/O port 6 with 3-state output; I/O ports tolerate up to 5.5 V.
14 B5 bidirectional B-bus I/O port 5 with 3-state output; I/O ports tolerate up to 5.5 V.
15 B4 bidirectional B-bus I/O port 4 with 3-state output; I/O ports tolerate up to 5.5 V.
16 B3 bidirectional B-bus I/O port 3 with 3-state output; I/O ports tolerate up to 5.5 V.
17 B2 bidirectional B-bus I/O port 2 with 3-state output; I/O ports tolerate up to 5.5 V.
18 B1 bidirectional B-bus I/O port 1 with 3-state output; I/O ports tolerate up to 5.5 V.
19 OE input Active-low output-enable input; a high level disables the outputs and isolates the A and B buses.
20 VCC power_in Supply voltage, recommended 4.5 V to 5.5 V (absolute maximum 7 V).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOP-20-208mil
Category Logic
Pins 20

CAD (KiCad official)

  • Symbol: SN74ALS645A-1NSR
  • Footprint: Package_SO:SOP-20_7.5x12.8mm_P1.27mm
  • 3D model: SOP-20-208mil, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 2.65 mm nominal SOIC height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: sn74als645a-1nsr-etched.step / sn74als645a-1nsr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74als645a-1nsr.step / sn74als645a-1nsr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (20 pp, sha256 e5bfc2517772955d, retrieved 2026-10-11, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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