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74VHC244MTC

onsemi · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

74VHC244MTC from onsemi, in a TSSOP-20. 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	OE1	input	Active-LOW 3-STATE output enable input for outputs O0-O3 (pins 12, 14, 16, 18).
2	I0	input	Buffer input 0, drives output O0 (pin 18) when OE1 is LOW.
3	O4	tri_state	3-STATE buffer output 4, follows I4 when OE2 is LOW and is high impedance when OE2 is HIGH.
4	I1	input	Buffer input 1, drives output O1 (pin 16) when OE1 is LOW.
5	O5	tri_state	3-STATE buffer output 5, follows I5 when OE2 is LOW and is high impedance when OE2 is HIGH.
6	I2	input	Buffer input 2, drives output O2 (pin 14) when OE1 is LOW.
7	O6	tri_state	3-STATE buffer output 6, follows I6 when OE2 is LOW and is high impedance when OE2 is HIGH.
8	I3	input	Buffer input 3, drives output O3 (pin 12) when OE1 is LOW.
9	O7	tri_state	3-STATE buffer output 7, follows I7 when OE2 is LOW and is high impedance when OE2 is HIGH.
10	GND	power_in	Ground.
11	I7	input	Buffer input 7, drives output O7 (pin 9) when OE2 is LOW.
12	O3	tri_state	3-STATE buffer output 3, follows I3 when OE1 is LOW and is high impedance when OE1 is HIGH.
13	I6	input	Buffer input 6, drives output O6 (pin 7) when OE2 is LOW.
14	O2	tri_state	3-STATE buffer output 2, follows I2 when OE1 is LOW and is high impedance when OE1 is HIGH.
15	I5	input	Buffer input 5, drives output O5 (pin 5) when OE2 is LOW.
16	O1	tri_state	3-STATE buffer output 1, follows I1 when OE1 is LOW and is high impedance when OE1 is HIGH.
17	I4	input	Buffer input 4, drives output O4 (pin 3) when OE2 is LOW.
18	O0	tri_state	3-STATE buffer output 0, follows I0 when OE1 is LOW and is high impedance when OE1 is HIGH.
19	OE2	input	Active-LOW 3-STATE output enable input for outputs O4-O7 (pins 3, 5, 7, 9).
20	VCC	power_in	Positive supply voltage.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	TSSOP-20
Category	Logic
Pins	20

CAD (KiCad official)

Symbol: 74VHC244MTC
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)
3D model files: 74vhc244mtc-etched.step / 74vhc244mtc-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74vhc244mtc.step / 74vhc244mtc.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (10 pp, sha256 70dde42bac97d583, retrieved 2026-10-19, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (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