MM74HC373MTCX from onsemi, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	OE	input	Output Enable (active LOW). When HIGH, all Q outputs are placed in the high-impedance state.
2	1Q	tri_state	Latch 1 Q output (3-state). Follows 1D when LE is HIGH; holds last value when LE is LOW.
3	1D	input	Latch 1 D input.
4	2D	input	Latch 2 D input.
5	2Q	tri_state	Latch 2 Q output (3-state).
6	3Q	tri_state	Latch 3 Q output (3-state).
7	3D	input	Latch 3 D input.
8	4D	input	Latch 4 D input.
9	4Q	tri_state	Latch 4 Q output (3-state).
10	GND	power_in	Ground reference (0 V).
11	LE	input	Latch Enable. When HIGH, Q outputs follow D inputs (transparent). When LOW, Q outputs are latched.
12	5Q	tri_state	Latch 5 Q output (3-state).
13	5D	input	Latch 5 D input.
14	6D	input	Latch 6 D input.
15	6Q	tri_state	Latch 6 Q output (3-state).
16	7Q	tri_state	Latch 7 Q output (3-state).
17	7D	input	Latch 7 D input.
18	8D	input	Latch 8 D input.
19	8Q	tri_state	Latch 8 Q output (3-state).
20	VCC	power_in	Positive supply voltage. Operating range 2 V to 6 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MM74HC373MTCX
MM74HC373MTCXM
MM74HC373MTCXMX
MM74HC373MTCXN

CAD (KiCad official)

Symbol: MM74HC373MTCX
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

Provenance

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

Datasheet: onsemi datasheet (10 pp, sha256 304befb6d4582287, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF