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Texas Instruments SN74HC251N — Discrete Semiconductors
Texas Instruments

SN74HC251N Multiplexer, 1 x 8:1, 16-DIP, 74HC Series

MPNSN74HC251N
End of Life

Texas Instruments SN74HC251N, 74HC series, Multiplexer, 1 x 8:1 circuit, Through Hole 16-DIP (0.300", 7.62mm), Single Supply 2V ~ 6V, -40°C ~ 85°C.

$0.93Ref. price · indicative, final on quote
SN74HC251N datasheet
Packaging16-DIP (0.300", 7.62mm)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
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Specifications

SN74HC251N Technical Specifications
ParameterValue
TypeMultiplexer
Series74HC
Mounting typeThrough Hole
Voltage2V ~ 6V
Voltage supply sourceSingle Supply
Current - output high, low7.8mA, 7.8mA
Operating temperature-40°C ~ 85°C
Circuit1 x 8:1
PackageTube
Case16-DIP (0.300\", 7.62mm)
Independent circuits1

Product details

Package and mounting

The SN74HC251N is a single 8-to-1 multiplexer in a 16-pin DIP package. It selects one of eight data inputs and routes it to a single output, controlled by a three-bit address.

Output drive — what 7.8 mA means for your load

The high and low output current is rated at 7.8 mA each. That's enough to drive standard CMOS inputs and low-power logic, but don't plan on lighting an LED or pulling a relay coil directly — you'll want a buffer or transistor stage. On a repair bench, if the board's output trace looks clean but the next gate isn't toggling, check that the load doesn't exceed this figure.

Lifecycle and supply posture

The SN74HC251N carries an Active product status and is ROHS3 compliant.

Frequently asked questions

What is the function of the 74HC251 multiplexer?

It is a single 8-to-1 multiplexer: it selects one of eight data inputs based on a three-bit address and routes that signal to the single output. The 74HC family operates from 2V to 6V single supply.

What is the difference between 74HC251 and 74LS251?

The 74HC251 runs on CMOS technology with a wider supply range (2V to 6V) and lower power consumption than the 74LS251 bipolar version, which typically runs on 5V and draws higher supply current. The HC variant also offers the full industrial temperature range (-40°C to 85°C) versus the 74LS251's commercial 0°C to 70°C range.