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Quad 2-Input Multiplexer IC - 74HC157

Quad 2-Input Multiplexer IC - 74HC157

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  • Expand any data input point
  • Multiplex dual data buses
  • Generate four functions of two variables (one variable is common)
  • Source programmable counters

Quad 2-Input Multiplexer IC - 74HC157

The 74HC Series 74HC157 is a 16-Pin Quad 2-Input Multiplexer IC having 2V to 6V Operating Voltage range with 1uA Low Input current and high noise immunity. It selects 4 bits of data from two sources under the control of a common data select input (S). The enable input (E) is active LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of all other input conditions.


Pinout of 74HC157 IC

Pin Number

Pin Name



Input A

This is the first input line of the 2:1 Multiplexer


Input B

This is the second input line of the 2:1 Multiplexer


Output Y

This is the output line pin of the Multiplexer


Line Select (S)

The select pin selects one of the two input lines and gives it to the output line


Enable (E)

Active low pin. Grounded for normal operation



Connected to the ground of the system



This pin powers the IC, typically +5V is used.

Also check 74LS161 Synch 4-Bit Counter. It has an operating voltage range of 4.5V to 5.5V and a temperature range of -55°C to +125°C
Also check 74HC151 IC74HC151 - 8-Input Multiplexer IC), used as a Data Selector/Multiplexer with full on-chip decoding to select one of eight data sources based on a unique three-binary code at select inputs

Package Includes:

  • 1 x IC - 74HC157


Type DIP
Voltage Rating 2 to 6V
Current Rating 1µA low input current
Temperature Rating -55 to 125 Deg C
Number of pins 16
Noise Immunity NIL = 30%, NIH = 30% of VCC at VCC = 5V
Dimensions 7x5x3mm
Weight 2g

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1.What is 74HC157?

  • The 74HC157 (74HCT157) is a high-speed Si-gate CMOS device that is pin compatible with Low-power Schottky TTL. The 74HC/HCT157 is frequently used to transfer data between two groups of registers and four common output buses.

2.Is IC 74157 multiplexer?

  • The 74HC157 is a two-input (2:1) multiplexer integrated circuit. Because it contains four similar multiplexers, it is known as a Quad package 2-Input Multiplexer. As we know, a Multiplexer accepts two or more inputs and selects one of them as the output based on the Select line status.