74HC00 Pinout

74HC00 Quad NAND Gate · Quad 2-input NAND gate. The most classic digital logic chip.

DIP-14 Logic 14 pins No backend · 100% client-side

1A 1

1B 2

1Y 3

2A 4

2B 5

2Y 6

GND 7

74HC00 DIP-14

14 VCC

13 4B

12 4A

11 4Y

10 3B

9 3A

8 3Y

PowerGNDInputOutputI/OControl

Pin	Name	Type	Function
1	1A	Input	Gate 1 input A
2	1B	Input	Gate 1 input B
3	1Y	Output	Gate 1 output (1A·1B)′
4	2A	Input	Gate 2 input A
5	2B	Input	Gate 2 input B
6	2Y	Output	Gate 2 output
7	GND	GND	Ground
8	3Y	Output	Gate 3 output
9	3A	Input	Gate 3 input A
10	3B	Input	Gate 3 input B
11	4Y	Output	Gate 4 output
12	4A	Input	Gate 4 input A
13	4B	Input	Gate 4 input B
14	VCC	Power	Supply + (2–6V)

How to · reading it

How to read the 74HC00 pinout

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.
02
Count counter-clockwise
Count counter-clockwise from pin 1: go down the left side first, then up the right side from the bottom.
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

Why is NAND called a "universal gate"?

Using only NAND gates you can build NOT/AND/OR and any logic function whatsoever, which makes the 74HC00 a cornerstone of digital circuits.

Same pinout as the 74HC08/32?

Same layout (quad 2-input gates, 7=GND / 14=VCC); the only difference is gate logic: 00=NAND, 08=AND, 32=OR.

Data source

Pinout data comes from NXP/TI 74HC00 datasheet (standard DIP-14 numbering). Refer to the actual device datasheet as authoritative for the pinout.