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Texas Instruments MM74HC257J — DC-DC Power Modules
Texas Instruments

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
MM74HC257J datasheet
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Specifications

MM74HC257J Technical Specifications
ParameterValue
TypeMultiplexer
Series74HC
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

What the MM74HC257J is and where it fits

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. The -55°C to 125°C temperature range suits it for military, avionics, and industrial control environments where the board sees wide thermal cycling. The 7.8 mA output drive at both high and low states is typical for HC logic — enough to drive a CMOS load or a single TTL gate, but not a long backplane trace without a buffer.

RoHS status — plan for leaded assembly

This part is marked RoHS non-compliant. It is acceptable for builds where leaded solder is permitted.

Lifecycle and sourcing posture

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.