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Texas Instruments MM74HC257J — DC-DC Power Modules

MM74HC257J Multiplexer, 4 x 2:1, 2V~6V, -55°C~125°C

MPNMM74HC257J
End of Life

Fairchild MM74HC257J, 74HC series, Type Multiplexer, Circuit 4 x 2:1, Voltage - Supply 2V ~ 6V, Single Supply, Operating Temperature -55°C ~ 125°C, Current - Output High, Low 7.8mA, 7.8mA, Package Bulk.

$1.13Ref. price · indicative, final on quote
RoHSRoHS non-compliant
Series74HC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

MM74HC257J specifications
ParameterValue
TypeMultiplexer
Series74HC
Supply voltage2V ~ 6V
Voltage supply sourceSingle Supply
Current - output high, low7.8mA, 7.8mA
Operating temperature-55°C ~ 125°C
Circuit4 x 2:1
PackageBulk
Independent circuits1

Product details

The Fairchild MM74HC257J is a 74HC-series quad 2-input multiplexer with a single supply range of 2V to 6V. It routes one of two 4-bit data sources to a common output, controlled by a select line and an output-enable gate.

RoHS status — plan for leaded assembly

It is acceptable for builds where leaded solder is permitted.

No official successor is listed. The DIP package may have thinner availability than surface-mount variants.

Output drive — what 7.8 mA means for the load

The 7.8 mA output high and low current is the rated sink/source capability at the rated output voltage.

Frequently asked questions

What is the function of MM74HC257J?

It is a 4-bit 2-input multiplexer (4 x 2:1). It selects one of two 4-bit data buses and routes the chosen bus to the output, controlled by a single select line and an output-enable input.

What is the closest functional second-source — SN74LS348N?

The SN74LS348N is a priority encoder (1 x 8:3), not a multiplexer. It is not a functional replacement for the MM74HC257J. For a second-source multiplexer, look at the 74HC257 from TI, NXP, or other manufacturers in the same DIP package.