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Texas Instruments 74S158PC — Logic ICs
Texas Instruments

74S158PC TTL Multiplexer, 4-Function 2-Line Input, Active

MPN74S158PC
End of Life

74S158PC, Fairchild Semiconductor, TTL multiplexer, 4-function 2-line input, through-hole DIP, Active lifecycle, RoHS non-compliant.

$0.28Ref. price · indicative, final on quote
74S158PC datasheet
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Specifications

74S158PC Technical Specifications
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Product details

The 74S158PC is a TTL multiplexer from Fairchild Semiconductor that selects one of two data lines per function, with four independent multiplexer functions on a single chip. It is a through-hole device, typically in a DIP package, designed for legacy TTL logic systems where board-level signal routing or data selection is needed.

The 74S158PC is listed as RoHS non-compliant. This is a sourcing constraint for any new build requiring RoHS conformance, particularly for EU-market products or assemblies that must pass restricted-substance testing. For legacy repair, retrofit, or military/aerospace applications where RoHS exemption applies, this part remains a valid choice. Verify your project's compliance requirements before committing the BOM line.

Lifecycle and supply posture

Because it is a legacy TTL part with RoHS non-compliance, availability may be tighter than for modern lead-free equivalents.

Frequently asked questions

What is the function of the 74S158 multiplexer?

The 74S158 is a TTL multiplexer with four independent functions, each selecting between two input lines. It performs data selection or signal routing in digital logic circuits.

What is the difference between 74S158PC and 74LS158?

The 74S158 uses Schottky TTL logic (higher speed, higher power consumption), while the 74LS158 uses Low-Power Schottky TTL (lower speed, lower power). Both are 4-function 2-line-input multiplexers with the same pinout and function, but the S-series is faster and draws more supply current. The 74S158PC is through-hole; the 74LS158 is also through-hole but in the LS family.