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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

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