74ACT158SC Equivalent & Substitute Parts

Part Overview

The 74ACT158SC is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74ACT158SC operates with a single supply voltage between 4.5V and 5.5V, delivering 24mA output current capability in both high and low states, and functions across the industrial temperature range of -40°C to 85°C.

Substiute Parts

74ACT158SC

onsemiIn Stock: 104974ACT158SC Datasheet

Current PartRFQ

MC74ACT157DG

onsemiIn Stock: 1689MC74ACT157DG Datasheet

Parametric EquivalentRFQ

CD74ACT158M96

Texas InstrumentsIn Stock: 2219CD74ACT158M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT158SC is determined by strict equivalence across the following critical parameters: circuit configuration (4 x 2:1 multiplexer), output current capability (24mA high and low), supply voltage range (4.5V ~ 5.5V), package type (16-SOIC), and mounting method (surface mount). All substitute parts must maintain these electrical and mechanical specifications to ensure functional compatibility.

The substitute parts are grouped as follows:

Parametric Equivalent: MC74ACT157DG (onsemi) — Maintains identical electrical specifications and package configuration with active product status.

Similar Substitute: CD74ACT158M96 (Texas Instruments) — Maintains identical electrical specifications and package configuration with extended operating temperature range (-55°C ~ 125°C) and active product status.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, MC74ACT157DG is the primary substitute for 74ACT158SC. Both parts are manufactured by onsemi, maintain identical electrical and thermal specifications, and are housed in the same 16-SOIC package. MC74ACT157DG carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

CD74ACT158M96 from Texas Instruments serves as an alternative substitute with identical core electrical specifications and package configuration. This part offers an extended operating temperature range (-55°C ~ 125°C) compared to the original specification (-40°C ~ 85°C), providing additional thermal margin for demanding applications. CD74ACT158M96 is also active and ROHS3 compliant.

Both substitute parts are REACH unaffected and classified under ECCN EAR99, maintaining the same regulatory status as the original component.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT157DG directly replace 74ACT158SC in existing designs?

A: Yes. MC74ACT157DG maintains identical electrical specifications (4 x 2:1 multiplexer configuration, 24mA output current, 4.5V ~ 5.5V supply voltage), operating temperature range (-40°C ~ 85°C), and 16-SOIC package dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between MC74ACT157DG and CD74ACT158M96?

A: Both parts are electrically equivalent with identical multiplexer configuration and output current ratings. The primary difference is the operating temperature range: MC74ACT157DG operates from -40°C to 85°C, while CD74ACT158M96 extends to -55°C to 125°C. CD74ACT158M96 is manufactured by Texas Instruments; MC74ACT157DG is manufactured by onsemi.

Q: Are the substitute parts available in the same packaging?

A: Yes. All three parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. PCB layout and footprint compatibility are maintained across all substitutes.

Q: What is the moisture sensitivity level for substitute parts?

A: Both MC74ACT157DG and CD74ACT158M96 have a Moisture Sensitivity Level (MSL) of 1 (Unlimited), matching the original 74ACT158SC specification.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both MC74ACT157DG and CD74ACT158M96 are ROHS3 compliant, supporting modern environmental and regulatory requirements.

Q: Why is 74ACT158SC marked as obsolete?

A: The original part is no longer in active production. MC74ACT157DG and CD74ACT158M96 are active alternatives that provide equivalent functionality with improved product lifecycle support.