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SN74AHC244QDWRQ1

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74AHC244QDWRQ1

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-20-300mil

SN74AHC244QDWRQ1 from Texas Instruments, in a SOIC-20-300mil. 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 1OE input Active-low output enable for buffer 1 (1Y1 to 1Y4): when OE is low the 1A inputs pass to the 1Y outputs, and when OE is high the 1Y outputs are high-impedance (Z).
2 1A1 input Data input 1A1 of buffer 1; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
3 2Y4 output Data output 2Y4 of buffer 2, which goes to high-impedance (Z) when 2OE is high.
4 1A2 input Data input 1A2 of buffer 1; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
5 2Y3 output Data output 2Y3 of buffer 2, which goes to high-impedance (Z) when 2OE is high.
6 1A3 input Data input 1A3 of buffer 1; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
7 2Y2 output Data output 2Y2 of buffer 2, which goes to high-impedance (Z) when 2OE is high.
8 1A4 input Data input 1A4 of buffer 1; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
9 2Y1 output Data output 2Y1 of buffer 2, which goes to high-impedance (Z) when 2OE is high.
10 GND power_in Ground pin for the device.
11 2A1 input Data input 2A1 of buffer 2; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
12 1Y4 output Data output 1Y4 of buffer 1, which goes to high-impedance (Z) when 1OE is high.
13 2A2 input Data input 2A2 of buffer 2; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
14 1Y3 output Data output 1Y3 of buffer 1, which goes to high-impedance (Z) when 1OE is high.
15 2A3 input Data input 2A3 of buffer 2; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
16 1Y2 output Data output 1Y2 of buffer 1, which goes to high-impedance (Z) when 1OE is high.
17 2A4 input Data input 2A4 of buffer 2; the datasheet specifies an input voltage range of 0 V to 5.5 V and says unused inputs must be held at VCC or GND.
18 1Y1 output Data output 1Y1 of buffer 1, which goes to high-impedance (Z) when 1OE is high.
19 2OE input Active-low output enable for buffer 2 (2Y1 to 2Y4): when OE is low the 2A inputs pass to the 2Y outputs, and when OE is high the 2Y outputs are high-impedance (Z).
20 VCC power_in Supply pin; the recommended supply range is 2 V to 5.5 V, and each VCC pin should be bypassed close to the device (0.1 µF recommended for a single supply).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-20-300mil
Category Logic
Pins 20

CAD (KiCad official)

  • Symbol: SN74AHC244QDWRQ1
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
  • 3D model files: sn74ahc244qdwrq1-etched.step / sn74ahc244qdwrq1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ahc244qdwrq1.step / sn74ahc244qdwrq1.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (27 pp, sha256 b8d4fd97ed6baa6f, retrieved 2026-10-08, 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 0.3, primary claude-haiku-5-5 (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