CD4078 8-Input NOR/OR Gate


CD4078 belongs to the 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD4078 has 8-Input NOR/OR Gate

CD4078 has a supply voltage range of 5V to 20V, which is much higher than any contemporary logic family. It has buffered output which improves transfer characteristics by providing very high gain. All inputs are protected against static discharge with diodes to VDD and VSS.

CD4078 Features

  • High-Voltage Types (20V Rating)
  • Buffered Inputs and Outputs
  • Standard Symmetrical Output Characteristics
  • 100% Tested for Maximum Quiescent Current at 20V
  • 5V, 10V, and 15V Parametric Ratings
  • Maximum Input Current of 1μA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC
  • Noise Margin (Over Full Package Temperature Range):
    • 1V at VDD = 5V
    • 2V at VDD = 10V
    • 2.5V at VDD = 15V

CD4078 Specifications

Absolute Maximum Ratings

  • DC Supply Voltage Range, (VDD): -0.5V to +20V (Voltage Referenced to VSS Terminals)
  • Input Voltage Range, All Inputs: -0.5V to VDD +0.5V
  • DC Input Current, Any One Input: ±10mA
  • Operating Temperature Range: -55oC to +125oC Package Types D, F, K, H
  • Storage Temperature Range (TSTG): -65oC to +150oC
  • Lead Temperature (During Soldering): +265oC
    • At Distance 1/16 ± 1/32 Inch (1.59mm ± 0.79mm) from case for 10s Maximum

CD4078 Pinout Diagram

CD4078 Pin Description

Pin NoPin NameDescription
1K=(A+B+C+D+E+F+G+H)Output Of OR Gate
2AInput 1 Of NOR/OR Gate
3B Input 2 Of NOR/OR Gate
4C Input 3 Of NOR/OR Gate
5D Input 4 Of NOR/OR Gate
6NCNo Connection
7VSSSupply Voltage
8NC No Connection
9E Input 5 Of NOR/OR Gate
10F Input 6 Of NOR/OR Gate
11G Input 7 Of NOR/OR Gate
12H Input 8 Of NOR/OR Gate
13J=(A+B+C+D+E+F+G+H)’ Output Of NOR Gate
14VDDDrain Voltage

CD4078 Circuit


  • Mixer tank
  • An intrusion detection
  • Alarm system

CD4078 Alternative Equivalent

CD4001, CD4002, CD4025

Download CD4078 8-Input NOR/OR Gate Datasheet from the link given below.