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IC Pinouts / 74HC02

74HC02 Pinout

74HC02 Quad NOR Gate · Four 2-input NOR gates, high-speed CMOS, supply 2–6V.

DIP-14 Logic 14 pins No backend · 100% client-side
1Y 1
1A 2
1B 3
2Y 4
2A 5
2B 6
GND 7
74HC02 DIP-14
14 VCC
13 4Y
12 4B
11 4A
10 3Y
9 3B
8 3A
PowerGNDInputOutputI/OControl
PinNameTypeFunction
1 1Y Output Gate 1 output = NOR(1A,1B)
2 1A Input Gate 1 input A
3 1B Input Gate 1 input B
4 2Y Output Gate 2 output
5 2A Input Gate 2 input A
6 2B Input Gate 2 input B
7 GND GND Ground
8 3A Input Gate 3 input A
9 3B Input Gate 3 input B
10 3Y Output Gate 3 output
11 4A Input Gate 4 input A
12 4B Input Gate 4 input B
13 4Y Output Gate 4 output
14 VCC Power Supply + (2–6V)
How to · reading it

How to read the 74HC02 pinout

  1. 01

    Find pin 1

    One end of the chip has a half-circle notch or a dot; with the notch facing up, the top-left pin is pin 1.

  2. 02

    Count counter-clockwise

    Count counter-clockwise from pin 1: go down the left side first, then up the right side from the bottom.

  3. 03

    Check the table below

    Look up each pin's function by number in the table below; power/ground are color-coded, and alternate-function signals are in parentheses.

FAQ

Frequently asked questions

Why does the 74HC02 pinout look different from the 74HC00?

The 7402 is "output-first": each gate output sits before its two inputs, whereas the 7400/7408/7432 are "input-first". Watch this when swapping NAND/NOR layouts on a board.

How do I handle unused inputs?

CMOS inputs must never float — tie unused inputs to GND or VCC. For a NOR gate, tying unused inputs low keeps the gate responsive to the used input.

Data source

Pinout data comes from NXP/TI 74HC02 datasheet (standard DIP-14 numbering). Refer to the actual device datasheet as authoritative for the pinout.

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