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CD74HCT243M

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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CD74HCT243M

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-14

CD74HCT243M from Texas Instruments, in a SOIC-14. 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 OEB input Output-enable B control input; HIGH (with OEA HIGH) enables B-to-A data flow (An = output, Bn = input); LOW (with OEA LOW) enables A-to-B data flow; mixed OEA/OEB states force all I/O to high-Z; VIL = 0.8 V max, VIH = 2 V min (HCT type).
2 NC unconnected No internal connection.
3 A0 bidirectional Port A channel 0 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB.
4 A1 bidirectional Port A channel 1 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB.
5 A2 bidirectional Port A channel 2 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB.
6 A3 bidirectional Port A channel 3 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB.
7 GND power_in Ground reference; continuous current through GND pin must not exceed ±70 mA.
8 B3 bidirectional Port B channel 3 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB.
9 B2 bidirectional Port B channel 2 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB.
10 B1 bidirectional Port B channel 1 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB.
11 B0 bidirectional Port B channel 0 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB.
12 NC unconnected No internal connection.
13 OEA input Output-enable A control input; HIGH (with OEB HIGH) enables B-to-A data flow (An = output, Bn = input); LOW (with OEB LOW) enables A-to-B data flow; mixed OEA/OEB states force all I/O to high-Z; VIL = 0.8 V max, VIH = 2 V min (HCT type).
14 VCC power_in Positive supply voltage; HCT type: 4.5 V to 5.5 V recommended operating range; continuous current through VCC must not exceed ±70 mA.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-14
Category Logic
Pins 14

CAD (KiCad official)

  • Symbol: CD74HCT243M
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: cd74hct243m-etched.step / cd74hct243m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cd74hct243m.step / cd74hct243m.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (24 pp, sha256 40fb03b77b5d31c8, retrieved 2026-09-26, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-sonnet-4-6 (text+vision), consensus claude-opus-4-7 (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