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74LS32 Quad-2-Input OR Gate

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The 74LS32 is a Dual Input OR Gate with Quad package. It contains four independent gates each of which performs the logic OR function. Each gate has two inputs that’s why it is named Quad 2-Input OR Gate. Logic level gates like 74LS32 and flip-flops play a vital role in digital electronics.


Pin Description

Pin Number

Pin Name



OR Gate Input pin (A)

First Input pin for the OR gate


OR Gate Input pin (B)

Second Input pin for the OR gate


OR Gate Output pin (Q)

Output pin for the OR gate



Connect to the ground of the circuit.


Vcc (Vdd)

Used to power the IC. Typically +5V is used



  • Dual Input OR Gate – Quad Package
  • Supply Voltage: 5 to 7V 
  • Input Voltage: 5 to 7V
  • Operating temperature range = -55°C to 125°C
  • Available in 14-pin SOIC package


Note: Complete Technical Details can be found at the datasheet give at the end of this page.


Equivalent for 74LS32: CD4071

Other Logic Gates:  74LS00, 74LS08, 74LS02, 74LS04, 74HCT04


How to use 74LS32

74LS32 or 74LS32N has 12 input output pins for a total of four OR gates. To use the 74LS32 Logic gate IC, just power it using the Vcc and ground pins. The typical operating voltage of the IC is +5V, but it can also be operated in +7V. The output voltage of the IC on the pin Y will be equal to the operating voltage of the IC. As per the OR gate truth table, when either one or both the input of the Gate is high the output will be high. Truth table of OR gate is given as:

        A        B       Q
        0        0        0
        1        0        1
        0        1        1
        1          1        1

74LS32 IC Internal Diagram

According to the truth table when both the inputs are low output will be zero. When either one or both the input of the Gate is high the output will be high.  



  • Basic Logic Circuits
  • Encoders and Decoders
  • Multiplexers and De-multiplexers
  • Oscillator circuits
  • Networking and Digital Systems 



2D Model of 74LS32 Quad 2-Input OR Gate

Component Datasheet

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