Four independent 2-input NOR gates in high-speed CMOS, SOIC-14. Each output goes high only when both inputs are low (it is an OR followed by an inversion). NOR is functionally complete, so these gates build any logic function, and a cross-coupled pair makes a simple SR latch. Note the pin order puts each gate's output first (1Y, then 1A, 1B), the mirror of the 74HC00 NAND layout. Runs 2-6 V.

Pinout

Pin	Name	Type	Function
1	1Y	output	Channel 1 NOR gate output Y = NOT(1A + 1B). Balanced CMOS push-pull output; ±4 mA drive at VCC = 4.5 V.
2	1A	input	Channel 1 NOR gate input A. Standard CMOS high-impedance input; VIH ≥ 3.15 V and VIL ≤ 1.35 V at VCC = 4.5 V.
3	1B	input	Channel 1 NOR gate input B. Standard CMOS high-impedance input; VIH ≥ 3.15 V and VIL ≤ 1.35 V at VCC = 4.5 V.
4	2Y	output	Channel 2 NOR gate output Y = NOT(2A + 2B). Balanced CMOS push-pull output; ±4 mA drive at VCC = 4.5 V.
5	2A	input	Channel 2 NOR gate input A. Standard CMOS high-impedance input.
6	2B	input	Channel 2 NOR gate input B. Standard CMOS high-impedance input.
7	GND	power_in	Ground reference (0 V). Supply return for all four NOR gates.
8	3A	input	Channel 3 NOR gate input A. Standard CMOS high-impedance input.
9	3B	input	Channel 3 NOR gate input B. Standard CMOS high-impedance input.
10	3Y	output	Channel 3 NOR gate output Y = NOT(3A + 3B). Balanced CMOS push-pull output; ±4 mA drive at VCC = 4.5 V.
11	4A	input	Channel 4 NOR gate input A. Standard CMOS high-impedance input.
12	4B	input	Channel 4 NOR gate input B. Standard CMOS high-impedance input.
13	4Y	output	Channel 4 NOR gate output Y = NOT(4A + 4B). Balanced CMOS push-pull output; ±4 mA drive at VCC = 4.5 V.
14	VCC	power_in	Positive supply rail. Operating range 2 V to 6 V (absolute max 7 V). Bypass with a 100 nF ceramic to GND close to the pin.

Key specifications

Parameter	Value
Type	Quad 2-input NOR gate
Gates	4 independent
Function	Y = NOT (A OR B)
Logic family	HC (high-speed CMOS)
Supply voltage	2-6 V
Pin note	output-first order (1Y, 1A, 1B)
Package	SOIC-14
Body (L×W×H)	8.65 × 3.9 × 1.75 mm

Ordering variants

Same part, different packaging or reel option.

SN74HC02D (SOIC-14, tube)
SN74HC02DR (SOIC-14, tape & reel)

CAD (KiCad official)

Symbol: 74xx:74HC02
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D)

Provenance

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

Datasheet: Texas Instruments datasheet (43 pp, sha256 c00a60e986d9a3bc, retrieved 2026-08-17, tier: manufacturer)
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