74FCT257CTQG Equivalent & Substitute Parts

Part Overview

The 74FCT257CTQG is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Renesas Electronics Corporation in a 16-QSOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74FCT257CTQG operates across a temperature range of -40°C to 85°C and delivers output currents of 15mA (high) and 48mA (low) with single supply voltage operation.

Substiute Parts

74FCT257CTQG

Renesas Electronics CorporationIn Stock: 102774FCT257CTQG Datasheet

Current PartRFQ

CY74FCT2257ATQCT

Cypress Semiconductor CorpIn Stock: 983CY74FCT2257ATQCT Datasheet

MFR RecommendedRFQ

CY74FCT257ATQCT

Texas InstrumentsIn Stock: 928CY74FCT257ATQCT Datasheet

MFR RecommendedRFQ

CY74FCT257TQCT

Texas InstrumentsIn Stock: 979CY74FCT257TQCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74FCT257CTQG is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the identical 4 x 2:1 multiplexer circuit configuration with 1 independent circuit, ensuring pin-compatible operation.

Package Compatibility: All substitute parts are available in 16-SSOP (0.154", 3.90mm Width) surface mount packaging, matching the physical footprint and mounting requirements of the original component.

Operating Temperature Range: All substitute parts operate across the -40°C to 85°C temperature range, maintaining thermal performance specifications.

Voltage Supply: All substitute parts operate with single supply voltage in the 4.75V ~ 5.25V range, compatible with standard logic supply voltages.

Series Compatibility: All substitute parts belong to the 74FCT logic series, ensuring functional and electrical compatibility within the same product family.

The substitute parts listed below meet these core substitution criteria and are available from active product lines, addressing the obsolescence status of the original component.

Parameter Comparison

Engineering Selection Recommendations

CY74FCT2257ATQCT (Cypress Semiconductor): This part is available in active production status with Bulk packaging. Output current specifications (15mA high, 12mA low) most closely align with the original 74FCT257CTQG. MSL rating of 1 (Unlimited) matches the original component's moisture sensitivity level. This part is suitable for applications requiring output current characteristics similar to the original design.

CY74FCT257ATQCT (Texas Instruments): This part is available in active production status with Tape & Reel packaging and carries ROHS3 compliance certification. Output current specifications (32mA high, 64mA low) exceed the original component's ratings. MSL rating of 2 (1 Year) indicates standard moisture sensitivity handling. This part is suitable for applications where higher output drive capability is acceptable or beneficial.

CY74FCT257TQCT (Texas Instruments): This part is available in active production status with Tape & Reel packaging and carries ROHS3 compliance certification. Output current specifications (32mA high, 64mA low) match the CY74FCT257ATQCT. MSL rating of 2 (1 Year) indicates standard moisture sensitivity handling. This part is suitable for applications where higher output drive capability is acceptable or beneficial.

All three substitute parts maintain functional equivalence through identical circuit configuration, compatible packaging, matching operating temperature range, and series compatibility within the 74FCT logic family.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT2257ATQCT directly replace the 74FCT257CTQG?

A: Yes. Both parts share identical 4 x 2:1 multiplexer circuit configuration, 16-SSOP package footprint, -40°C to 85°C operating temperature range, and 74FCT series compatibility. The output current specifications (15mA high, 12mA low) are comparable to the original component.

Q: What is the difference between the Cypress and Texas Instruments substitute options?

A: The Cypress CY74FCT2257ATQCT provides output current specifications (15mA high, 12mA low) most similar to the original 74FCT257CTQG. The Texas Instruments options (CY74FCT257ATQCT and CY74FCT257TQCT) provide higher output current capability (32mA high, 64mA low) and include ROHS3 compliance certification. All three maintain functional equivalence through identical circuit configuration and package compatibility.

Q: Are there packaging differences between the substitute parts?

A: The Cypress CY74FCT2257ATQCT is supplied in Bulk packaging. The Texas Instruments parts (CY74FCT257ATQCT and CY74FCT257TQCT) are supplied in Tape & Reel (TR) packaging. All three parts use the same 16-SSOP physical package and are compatible with standard surface mount assembly processes.

Q: What does MSL rating mean for these components?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture absorption during storage and handling. The original 74FCT257CTQG carries MSL 1 (Unlimited), indicating minimal moisture sensitivity. The Cypress substitute carries MSL 1 (Unlimited). The Texas Instruments substitutes carry MSL 2 (1 Year), indicating standard moisture sensitivity with a one-year floor life under controlled storage conditions.

Q: Are the substitute parts compliant with environmental regulations?

A: All substitute parts carry REACH Unaffected status. The Texas Instruments options (CY74FCT257ATQCT and CY74FCT257TQCT) include ROHS3 compliance certification. The Cypress option does not specify RoHS status in the provided data.