CD74AC257M Equivalent & Substitute Parts

Part Overview

The CD74AC257M is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design requirements and production needs. The CD74AC257M operates as a single multiplexer circuit with dual output capability, suitable for signal routing and data selection applications in digital logic systems.

Substiute Parts

CD74AC257M

Texas InstrumentsIn Stock: 1822CD74AC257M Datasheet

Current PartRFQ

CD74AC257M96

Texas InstrumentsIn Stock: 1798CD74AC257M96 Datasheet

DirectRFQ

CD74AC157M

Harris CorporationIn Stock: 3047CD74AC157M Datasheet

Parametric EquivalentRFQ

MC74AC257DR2G

onsemiIn Stock: 3329MC74AC257DR2G Datasheet

MFR RecommendedRFQ

CD74AC158M

Texas InstrumentsIn Stock: 1945CD74AC158M Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74AC257M is determined by strict equivalence across the following critical parameters:

Circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC surface mount), output current capability (24mA high and low), voltage supply range compatibility, and operating temperature range. Parts are grouped into three substitution categories:

Direct Packaging Substitute: CD74AC257M96 maintains identical electrical specifications and circuit configuration but differs only in packaging format (Tape & Reel versus Tube). This part is functionally interchangeable at the circuit level.

Parametric Equivalent: CD74AC157M and CD74AC158M share the same 4 x 2:1 circuit configuration, 16-SOIC package, output current ratings, and voltage supply range. These parts are electrically equivalent for the specified parameters.

Manufacturer-Recommended Substitute: MC74AC257DR2G from onsemi provides the same 4 x 2:1 multiplexer function in 16-SOIC packaging with identical output current specifications. Voltage supply range is 2V ~ 6V (broader than the main part) and operating temperature is -40°C ~ 85°C (narrower than the main part).

Parameter Comparison

Engineering Selection Recommendations

CD74AC257M96 is the primary substitute for the discontinued CD74AC257M. Both parts are manufactured by Texas Instruments with identical electrical specifications and operating ranges. The only difference is packaging format (Tape & Reel versus Tube), which does not affect circuit performance. This part is currently active and in stock.

CD74AC157M and CD74AC158M are parametric equivalents suitable for applications where the specified electrical parameters are sufficient. Both maintain the 4 x 2:1 multiplexer configuration, 16-SOIC package, and identical output current and voltage supply specifications. CD74AC158M is manufactured by Texas Instruments and maintains full compatibility with the original part's operating temperature range.

MC74AC257DR2G from onsemi is a manufacturer-recommended substitute with identical circuit function and package. The voltage supply range extends to 6V (compared to 5.5V maximum for the original part), providing broader supply compatibility. The operating temperature range is narrower (-40°C ~ 85°C versus -55°C ~ 125°C), which may limit use in extreme temperature applications. This part is ROHS3 compliant and currently active.

All substitute parts maintain ROHS3 compliance and are suitable for applications requiring the 4 x 2:1 multiplexer function in 16-SOIC surface mount packaging.

Frequently Asked Questions (FAQ)

Q: Can CD74AC257M96 be used as a direct replacement for CD74AC257M?

A: Yes. CD74AC257M96 is electrically identical to CD74AC257M with the same circuit configuration, voltage supply range (1.5V ~ 5.5V), output current (24mA), and operating temperature range (-55°C ~ 125°C). The only difference is packaging format (Tape & Reel versus Tube), which does not affect circuit performance.

Q: What is the difference between CD74AC257M and CD74AC157M?

A: Both parts are 4 x 2:1 multiplexers in 16-SOIC packages with identical output current specifications (24mA) and voltage supply ranges (1.5V ~ 5.5V). The base product numbers differ (74AC257 versus 74AC157), but they share the same electrical parameters for the specified criteria. CD74AC157M is manufactured by Harris Corporation.

Q: Can MC74AC257DR2G replace CD74AC257M in all applications?

A: MC74AC257DR2G is functionally equivalent for the 4 x 2:1 multiplexer circuit in 16-SOIC packaging. However, the operating temperature range is narrower (-40°C ~ 85°C versus -55°C ~ 125°C). Applications requiring operation below -40°C or above 85°C must use CD74AC257M96, CD74AC157M, or CD74AC158M instead.

Q: Are all substitute parts ROHS3 compliant?

A: CD74AC257M96, CD74AC158M, and MC74AC257DR2G are all ROHS3 compliant. CD74AC157M compliance status is not specified in the provided data.

Q: What packaging formats are available for these multiplexer parts?

A: CD74AC257M is supplied in Tube packaging. CD74AC257M96 and MC74AC257DR2G are supplied in Tape & Reel (TR) format. CD74AC158M is supplied in Tube packaging. Packaging format does not affect electrical performance.