74AC157SC Equivalent & Substitute Parts

Part Overview

The 74AC157SC is a 4 x 2:1 multiplexer logic IC manufactured by onsemi in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74AC157 series provides single-supply operation across a 2V to 6V range with 24mA output drive capability, suitable for digital signal routing and data selection applications in logic circuits.

Substiute Parts

74AC157SC

onsemiIn Stock: 160974AC157SC Datasheet

Current PartRFQ

MC74AC157DR2G

onsemiIn Stock: 1481MC74AC157DR2G Datasheet

DirectRFQ

MC74AC157DG

onsemiIn Stock: 1265MC74AC157DG Datasheet

Parametric EquivalentRFQ

CD74AC157M

Harris CorporationIn Stock: 3047CD74AC157M Datasheet

SimilarRFQ

CD74AC157M96

Texas InstrumentsIn Stock: 2723CD74AC157M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC157SC is determined by the following critical parameters: circuit configuration (4 x 2:1 multiplexer), output drive current (24mA), single-supply operation, package type (16-SOIC), and mounting method (surface mount). All substitute parts maintain these core electrical and mechanical specifications.

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and are sourced from the original manufacturer (onsemi). These parts differ only in packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete).

Parametric Equivalents provide identical functional performance with the same electrical parameters and package, sourced from onsemi with Active product status.

Similar Alternatives maintain the same circuit configuration, output drive, and package but may have extended operating temperature ranges or different supply voltage specifications from alternative manufacturers (Harris Corporation, Texas Instruments). These parts are functionally compatible but require verification of system temperature and voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement with Active product status: MC74AC157DR2G and MC74AC157DG are the primary substitutes. Both are manufactured by onsemi with identical electrical specifications to the 74AC157SC. MC74AC157DR2G is supplied in Tape & Reel format suitable for automated assembly, while MC74AC157DG is supplied in Tube format. Both carry ROHS3 compliance certification.

For extended operating temperature range: CD74AC157M (Harris Corporation) and CD74AC157M96 (Texas Instruments) extend the operating temperature range to -55°C ~ 125°C and support a lower minimum supply voltage of 1.5V. These parts are suitable for applications requiring wider temperature operation. CD74AC157M96 includes ROHS3 compliance and MSL rating.

For procurement continuity: All substitute parts maintain the 16-SOIC package and surface mount configuration, ensuring PCB layout compatibility. Selection should prioritize Active product status parts (MC74AC157DR2G, MC74AC157DG, CD74AC157M, CD74AC157M96) over the Obsolete 74AC157SC for long-term design support and availability.

Frequently Asked Questions (FAQ)

Q: Can MC74AC157DR2G replace 74AC157SC directly on the PCB? A: Yes. MC74AC157DR2G is electrically and mechanically identical to 74AC157SC, with the same 16-SOIC package, output drive current (24mA), supply voltage range (2V ~ 6V), and operating temperature range (-40°C ~ 85°C). The only difference is packaging format (Tape & Reel vs. bulk) and Active product status.

Q: What is the difference between MC74AC157DR2G and MC74AC157DG? A: Both parts are manufactured by onsemi with identical electrical specifications. The difference is packaging format: MC74AC157DR2G is supplied in Tape & Reel (TR) format for automated pick-and-place assembly, while MC74AC157DG is supplied in Tube format for manual handling. Select based on assembly process requirements.

Q: Can I use CD74AC157M or CD74AC157M96 as substitutes? A: Yes, with design verification. Both parts maintain the 4 x 2:1 multiplexer configuration, 24mA output drive, and 16-SOIC package. However, they extend the operating temperature range to -55°C ~ 125°C and support a lower minimum supply voltage (1.5V vs. 2V). Verify that your application does not depend on the original temperature or voltage specifications before substitution.

Q: Are all substitute parts RoHS compliant? A: MC74AC157DR2G, MC74AC157DG, and CD74AC157M96 carry ROHS3 compliance certification. CD74AC157M does not specify RoHS status. Verify compliance requirements for your application.

Q: What is the MSL (Moisture Sensitivity Level) for these parts? A: MC74AC157DR2G, MC74AC157DG, and CD74AC157M96 all carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. CD74AC157M does not specify MSL rating.

Q: Which substitute should I choose for new designs? A: For new designs, select from Active product status parts: MC74AC157DR2G (Tape & Reel), MC74AC157DG (Tube), CD74AC157M (Harris), or CD74AC157M96 (Texas Instruments). If your application requires extended temperature operation (-55°C ~ 125°C), choose CD74AC157M or CD74AC157M96. For standard temperature range (-40°C ~ 85°C), onsemi parts (MC74AC157DR2G or MC74AC157DG) provide continuity with the original manufacturer.