IDT74FCT257ATSOG8 Equivalent & Substitute Parts

Part Overview

The IDT74FCT257ATSOG8 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Renesas Electronics Corporation in a 16-SOIC surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 85°C and is suitable for applications requiring multiplexing of multiple signal channels.

Substiute Parts

IDT74FCT257ATSOG8

Renesas Electronics CorporationIn Stock: 1229IDT74FCT257ATSOG8 Datasheet

Current PartRFQ

CY74FCT257CTSOC

Texas InstrumentsIn Stock: 4237CY74FCT257CTSOC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IDT74FCT257ATSOG8 is based on the following critical parameters that must remain consistent:

Circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), mounting method (surface mount), operating temperature range (-40°C to 85°C), and series classification (74FCT). The substitute part CY74FCT257CTSOC from Texas Instruments maintains identical circuit topology, package dimensions, and thermal operating range. Both parts share the same base product number (74FCT257) and MSL rating, confirming functional and mechanical compatibility. Output current specifications differ between the main part and substitute, with the substitute providing higher drive capability (32mA/64mA versus 15mA/48mA).

Parameter Comparison

Engineering Selection Recommendations

The CY74FCT257CTSOC from Texas Instruments is the designated substitute for the obsolete IDT74FCT257ATSOG8. Selection of this alternative is supported by matching circuit topology, identical package specifications, and equivalent thermal operating range. The substitute part maintains active product status, ensuring long-term availability and supply chain continuity. Both components share identical REACH compliance and export classification (EAR99), with the substitute additionally certified as RoHS3 compliant. The substitute provides enhanced output current capability, which represents an improvement over the original specification and does not introduce compatibility constraints in standard multiplexer applications.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT257CTSOC directly replace the IDT74FCT257ATSOG8 in existing designs?

A: Yes. Both parts share identical 16-SOIC package dimensions, circuit configuration (4 x 2:1 multiplexer), and operating temperature range (-40°C to 85°C). Pin-to-pin compatibility is maintained, allowing direct PCB substitution without layout modifications.

Q: What is the significance of the higher output current in the substitute part?

A: The CY74FCT257CTSOC provides 32mA/64mA output current compared to the original 15mA/48mA specification. This represents increased drive capability and does not create compatibility issues in applications designed for the original part, as the substitute can deliver equal or greater current to loads.

Q: Why is the original part classified as obsolete?

A: The IDT74FCT257ATSOG8 is no longer in active production by Renesas Electronics Corporation. The CY74FCT257CTSOC maintains active status with Texas Instruments, providing reliable long-term availability for new designs and production support.

Q: Are there compliance or regulatory differences between the two parts?

A: Both parts share identical REACH compliance status (REACH Unaffected) and export classification (EAR99). The substitute additionally carries RoHS3 compliance certification, meeting current environmental and regulatory requirements.

Q: What packaging format is available for the substitute part?

A: The CY74FCT257CTSOC is supplied in tube packaging, suitable for automated assembly processes and standard component handling procedures.