IDT74FCT257ATSOG Equivalent & Substitute Parts

Part Overview

The IDT74FCT257ATSOG 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 essential for ongoing system support and new design implementations. The part operates across a temperature range of -40°C to 85°C and is suitable for applications requiring multiplexing functionality in single supply configurations.

Substiute Parts

IDT74FCT257ATSOG

Renesas Electronics CorporationIn Stock: 1196IDT74FCT257ATSOG Datasheet

Current PartRFQ

CY74FCT257CTSOC

Texas InstrumentsIn Stock: 4237CY74FCT257CTSOC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IDT74FCT257ATSOG is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount form factor
• Operating temperature range: -40°C to 85°C minimum
• Voltage supply architecture: Single supply operation
• Independent circuits: 1 circuit per device
• Moisture sensitivity level: MSL 1 or better

The CY74FCT257CTSOC from Texas Instruments satisfies all substitution criteria. Both devices share identical circuit topology, package specifications, and thermal operating ranges. The substitute part maintains compatibility with existing PCB layouts and thermal management designs while offering active product status and enhanced output current specifications.

Parameter Comparison

Engineering Selection Recommendations

The CY74FCT257CTSOC is the qualified substitute for the IDT74FCT257ATSOG based on the following engineering criteria:

Functional Equivalence: Both devices implement identical 4 x 2:1 multiplexer logic with matching circuit topology and pin configuration within the 16-SOIC package.

Thermal Compatibility: Operating temperature ranges are identical across both parts, ensuring thermal performance parity in system applications.

Product Lifecycle Status: The substitute part maintains active product status with established supply chains, whereas the original part is obsolete. This transition eliminates long-term availability risk.

Compliance and Certifications: The CY74FCT257CTSOC carries ROHS3 compliance certification, meeting modern regulatory requirements. Both parts maintain REACH unaffected status and identical MSL ratings.

Output Current Enhancement: The substitute part provides increased output current specifications (32mA/64mA versus 15mA/48mA), offering improved drive capability for downstream logic circuits without compromising compatibility.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT257CTSOC be used as a direct replacement for the IDT74FCT257ATSOG?

A: Yes. Both devices share identical circuit topology (4 x 2:1 multiplexer), package form factor (16-SOIC), and operating temperature range (-40°C to 85°C). Pin configuration and functional behavior are equivalent, enabling direct PCB substitution.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer (Renesas versus Texas Instruments), product status (obsolete versus active), and output current ratings. The CY74FCT257CTSOC provides higher output current (32mA/64mA) compared to the IDT74FCT257ATSOG (15mA/48mA) and includes ROHS3 compliance certification.

Q: Are there any package or mounting considerations for substitution?

A: No. Both parts use identical 16-SOIC surface mount packaging with 0.295" width (7.50mm). Existing PCB layouts, solder profiles, and assembly processes require no modification.

Q: Does the higher output current of the substitute part affect circuit design?

A: The increased output current of the CY74FCT257CTSOC is a performance enhancement that does not negatively impact existing designs. Systems designed for the original part specifications will operate within the substitute part's capabilities.

Q: What is the supply voltage requirement for the CY74FCT257CTSOC?

A: The substitute part operates at 4.75V to 5.25V single supply voltage. Verify that your system power supply falls within this range before implementation.