CD4001B — Quad 2-Input NOR Gate

Overview

The CD4001B (HEF4001B) is a quad 2-input NOR gate IC in the classic CMOS 4000 series manufactured by Texas Instruments, ON Semiconductor, and Renesas. Containing four independent 2-input NOR gates in a 14-pin DIP/SOIC package, it operates over a wide voltage range of 3.0V to 18.0V DC.

Providing high noise immunity, symmetrical output characteristics, and negligible static power consumption, the CD4001B is widely used in 12V automotive control circuits, high-voltage bistable latches, RC oscillators, and industrial sensor threshold gating.

Quick reference


Supply Voltage (`VDD`)	3.0 V to 18.0 V DC
Logic Family	CMOS 4000 Series (CD4000 / HEF4000)
Independent Gates	4 (Quad 2-Input NOR)
Propagation Delay	$60\text{ ns}$ typical at $VDD = 10\text{V}$
Output Drive Current	$\pm 1.5\text{ mA}$ at $VDD = 10\text{V}$
Package	14-pin DIP / SOIC-14 / TSSOP-14

Pinout (DIP-14 Package)

text

             ┌───┴───┐
          1A 1│ 1   14│ VDD
          1B 2│       │13 4B
         1/Y 3│ CD4001│12 4A
         2/Y 4│       │11 4/Y
          2A 5│       │10 3/Y
          2B 6│       │9  3B
         VSS 7│       │8  3A
             └───────┘

Note: Pinout of CD4001 (outputs on Pins 3, 4, 10, 11) is different from 74HC02 (outputs on Pins 1, 4, 10, 13).

Pin	Name	Description
1	`1A`	Gate 1 Input A
2	`1B`	Gate 1 Input B
3	`1/Y`	Gate 1 Output ( $1Y = \overline{1A + 1B}$ )
4	`2/Y`	Gate 2 Output ( $2Y = \overline{2A + 2B}$ )
5	`2A`	Gate 2 Input A
6	`2B`	Gate 2 Input B
7	`VSS`	Ground reference (0 V)
8	`3A`	Gate 3 Input A
9	`3B`	Gate 3 Input B
10	`3/Y`	Gate 3 Output ( $3Y = \overline{3A + 3B}$ )
11	`4/Y`	Gate 4 Output ( $4Y = \overline{4A + 4B}$ )
12	`4A`	Gate 4 Input A
13	`4B`	Gate 4 Input B
14	`VDD`	Positive power supply voltage (+3.0V to +18.0V DC)

Function & Truth Table (Per Gate)

Input A	Input B	Output Y
Low ( $L$ )	Low ( $L$ )	High ( $H$ )
Low ( $L$ )	High ( $H$ )	Low ( $L$ )
High ( $H$ )	Low ( $L$ )	Low ( $L$ )
High ( $H$ )	High ( $H$ )	Low ( $L$ )

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	$V_{DD}$	3.0	10.0	18.0	V	DC
High-Level Input Voltage	$V_{IH}$	3.5	—	—	V	$V_{DD} = 5\text{V}$
Low-Level Input Voltage	$V_{IL}$	—	—	1.5	V	$V_{DD} = 5\text{V}$
Propagation Delay ( $A,B \rightarrow Y$ )	$t_{PHL}, t_{PLH}$	—	60	120	ns	$V_{DD} = 10\text{V}$
High Output Drive Current	$I_{OH}$	$-0.5$	$-1.6$	—	mA	$V_{DD} = 5\text{V}, V_{OH} = 4.6\text{V}$
Quiescent Supply Current	$I_{DD}$	—	0.02	1.0	µA	$V_{DD} = 5\text{V}$

Typical Applications

12V Active-HIGH Sensor Latch Circuit