74ACT257SC Equivalent & Substitute Parts

Part Overview

The 74ACT257SC is a 4 x 2:1 multiplexer logic integrated circuit 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 74ACT257SC operates with a single 4.5V to 5.5V supply and delivers 24mA output current capability across its four independent 2:1 multiplexer circuits.

Substiute Parts

74ACT257SC

onsemiIn Stock: 102374ACT257SC Datasheet

Current PartRFQ

MC74ACT257DR2G

onsemiIn Stock: 2766MC74ACT257DR2G Datasheet

DirectRFQ

MC74ACT157DG

onsemiIn Stock: 1689MC74ACT157DG Datasheet

Parametric EquivalentRFQ

CD74ACT257M

Harris CorporationIn Stock: 2314CD74ACT257M Datasheet

SimilarRFQ

CD74ACT257M96

Texas InstrumentsIn Stock: 5625CD74ACT257M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT257SC is determined by the following critical parameters: circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), voltage supply range (4.5V ~ 5.5V), and mounting method (surface mount). Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging from the original manufacturer, differing only in product status or packaging format (tape & reel versus tube).

Parametric Equivalents provide the same circuit function and package but may originate from different manufacturers or have different base product numbers while maintaining core electrical compatibility.

Similar Parts share the same circuit function and package but exhibit variations in output current capability and operating temperature range, requiring design verification before substitution.

Parameter Comparison

Engineering Selection Recommendations

MC74ACT257DR2G is the primary direct substitute for the 74ACT257SC. Both parts are manufactured by onsemi with identical electrical specifications and operating parameters. MC74ACT257DR2G is currently in active production status with ROHS3 compliance, making it the preferred choice for new designs and ongoing procurement. The only difference is packaging format (tape & reel versus tube).

MC74ACT157DG provides an alternative from onsemi with identical electrical performance and active product status. This part is supplied in tube packaging and maintains full compatibility with the 74ACT257SC electrical requirements.

CD74ACT257M96 from Texas Instruments is an active product suitable for applications requiring extended operating temperature range (-55°C ~ 125°C) and higher output current capability (75mA). This part is ROHS3 compliant and available in tape & reel format. Selection of this part requires confirmation that the higher output current does not introduce thermal or power dissipation concerns in the target application.

CD74ACT257M from Harris Corporation is obsolete and should be avoided for new designs unless legacy system support is required.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT257DR2G directly replace 74ACT257SC in existing designs? A: Yes. MC74ACT257DR2G maintains identical electrical specifications, voltage supply range, output current, and operating temperature. The difference in packaging format (tape & reel) does not affect electrical compatibility.

Q: What is the difference between MC74ACT257DR2G and MC74ACT157DG? A: Both parts are onsemi products with identical electrical specifications. The primary difference is packaging format: MC74ACT257DR2G is supplied in tape & reel format, while MC74ACT157DG is supplied in tube format. Selection depends on procurement and assembly requirements.

Q: When should CD74ACT257M96 be selected instead of MC74ACT257DR2G? A: CD74ACT257M96 should be selected when the application requires extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C) or higher output current capability (75mA versus 24mA). Both parts maintain the same 4.5V ~ 5.5V supply voltage and 16-SOIC package.

Q: Are all substitute parts ROHS3 compliant? A: MC74ACT257DR2G, MC74ACT157DG, and CD74ACT257M96 are ROHS3 compliant. CD74ACT257M is RoHS non-compliant and obsolete.

Q: Does package type affect electrical performance? A: No. Tape & reel and tube packaging formats contain identical die and electrical performance. Package selection is determined by assembly equipment compatibility and procurement volume requirements.