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SN74LS390D

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Texas Instruments Counters, Dividers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LS390D

Texas Instruments · Counters, Dividers · SOIC-16

SN74LS390D from Texas Instruments, in a SOIC-16. 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 1CKA input Counter 1 clock input A for the divide-by-2 section (falling-edge triggered per logic diagram, input A).
2 1CLR input Direct clear input for counter 1, which resets all its outputs low.
3 1QA output Counter 1 output QA, the divide-by-2 output.
4 1CKB input Counter 1 clock input B for the divide-by-5 section.
5 1QB output Counter 1 output QB of the divide-by-5 section.
6 1QC output Counter 1 output QC of the divide-by-5 section.
7 1QD output Counter 1 output QD of the divide-by-5 section.
8 GND power_in Ground.
9 2QD output Counter 2 output QD of the divide-by-5 section.
10 2QC output Counter 2 output QC of the divide-by-5 section.
11 2QB output Counter 2 output QB of the divide-by-5 section.
12 2CKB input Counter 2 clock input B for the divide-by-5 section.
13 2QA output Counter 2 output QA, the divide-by-2 output.
14 2CLR input Direct clear input for counter 2, which resets all its outputs low.
15 2CKA input Counter 2 clock input A for the divide-by-2 section.
16 VCC power_in Positive supply voltage.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16
Category Logic
Pins 16

CAD (KiCad official)

  • Symbol: SN74LS390D
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74ls390d-etched.step / sn74ls390d-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls390d.step / sn74ls390d.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (37 pp, sha256 01ffbca0db1f34ba, retrieved 2026-10-08, 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