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CY74FCT543ATQCT

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-24-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CY74FCT543ATQCT

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SSOP-24-150mil

CY74FCT543ATQCT from Texas Instruments, in a SSOP-24-150mil. 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 LEBA input B-to-A latch-enable input (active low); a low level makes the B-to-A latches transparent and a low-to-high transition stores the data.
2 OEBA input B-to-A output-enable input (active low); with CEBA low it enables the 3-state A outputs.
3 A0 bidirectional A-to-B data input or B-to-A 3-state output, bit 0.
4 A1 bidirectional A-to-B data input or B-to-A 3-state output, bit 1.
5 A2 bidirectional A-to-B data input or B-to-A 3-state output, bit 2.
6 A3 bidirectional A-to-B data input or B-to-A 3-state output, bit 3.
7 A4 bidirectional A-to-B data input or B-to-A 3-state output, bit 4.
8 A5 bidirectional A-to-B data input or B-to-A 3-state output, bit 5.
9 A6 bidirectional A-to-B data input or B-to-A 3-state output, bit 6.
10 A7 bidirectional A-to-B data input or B-to-A 3-state output, bit 7.
11 CEAB input A-to-B enable input (active low); must be low to enter data from A or to take data from B.
12 GND power_in Ground.
13 OEAB input A-to-B output-enable input (active low); with CEAB low it enables the 3-state B outputs.
14 LEAB input A-to-B latch-enable input (active low); a low level makes the A-to-B latches transparent and a low-to-high transition stores the data.
15 B7 bidirectional B-to-A data input or A-to-B 3-state output, bit 7.
16 B6 bidirectional B-to-A data input or A-to-B 3-state output, bit 6.
17 B5 bidirectional B-to-A data input or A-to-B 3-state output, bit 5.
18 B4 bidirectional B-to-A data input or A-to-B 3-state output, bit 4.
19 B3 bidirectional B-to-A data input or A-to-B 3-state output, bit 3.
20 B2 bidirectional B-to-A data input or A-to-B 3-state output, bit 2.
21 B1 bidirectional B-to-A data input or A-to-B 3-state output, bit 1.
22 B0 bidirectional B-to-A data input or A-to-B 3-state output, bit 0.
23 CEBA input B-to-A enable input (active low); must be low to enter data from B or to take data from A.
24 VCC power_in Supply voltage; recommended 4.75 V to 5.25 V for CY74FCT543T.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SSOP-24-150mil
Category Logic
Pins 24

CAD (KiCad official)

  • Symbol: CY74FCT543ATQCT
  • Footprint: Package_SO:SSOP-24_5.3x8.2mm_P0.65mm
  • 3D model: SSOP-24-150mil (KiCad packages3D, STEP)
  • 3D model files: cy74fct543atqct-etched.step / cy74fct543atqct-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cy74fct543atqct.step / cy74fct543atqct.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (13 pp, sha256 1cca59eba0ac2344, retrieved 2026-10-07, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-4-5-20251001 (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