74FCT157ATQG Equivalent & Substitute Parts

Part Overview

The 74FCT157ATQG 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 identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations. The 74FCT series multiplexer provides single-supply operation with standard TTL-compatible logic levels, suitable for data selection and routing applications in digital systems.

Substiute Parts

74FCT157ATQG

Renesas Electronics CorporationIn Stock: 104174FCT157ATQG Datasheet

Current PartRFQ

CY74FCT157CTQCT

Texas InstrumentsIn Stock: 1264CY74FCT157CTQCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74FCT157ATQG is determined by the following critical parameters that must remain consistent across equivalent parts:

Functional Parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Independent circuits: 1
• Logic family: 74FCT series

Electrical Parameters:

• Voltage supply range: 4.75V ~ 5.25V (single supply)
• Operating temperature range: -40°C ~ 85°C
• Output current capability: High and low output current ratings

Physical Parameters:

• Package type: 16-SSOP surface mount
• Package dimensions: 0.154" width (3.90mm)

The CY74FCT157CTQCT from Texas Instruments satisfies all substitution criteria, maintaining identical circuit configuration, voltage supply specifications, temperature range, and package form factor while providing enhanced output current capability.

Parameter Comparison

Engineering Selection Recommendations

The CY74FCT157CTQCT is a direct functional substitute for the 74FCT157ATQG. Both components share identical circuit topology, voltage specifications, temperature range, and package form factor, enabling pin-compatible replacement in existing designs.

The Texas Instruments CY74FCT157CTQCT offers the advantage of active product status with ROHS3 compliance, supporting long-term supply chain continuity. The enhanced output current ratings (32mA high, 64mA low versus 15mA high, 48mA low) provide improved drive capability without compromising compatibility. The higher moisture sensitivity level (MSL 2 versus MSL 1) reflects standard modern manufacturing practices and does not impact functionality in typical operating environments.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT157CTQCT directly replace the 74FCT157ATQG in existing PCB designs?

A: Yes. Both components are pin-compatible 16-SSOP packages with identical pinout, voltage supply requirements, and operating temperature specifications. No PCB modifications are required.

Q: What is the significance of the different output current ratings?

A: The CY74FCT157CTQCT provides higher output current capability (32mA high, 64mA low) compared to the 74FCT157ATQG (15mA high, 48mA low). This enhancement increases the component's ability to drive external loads without degradation, making it suitable for applications requiring greater fan-out or lower impedance loads.

Q: Why is the 74FCT157ATQG classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The CY74FCT157CTQCT maintains active production status, ensuring availability for new designs and ongoing system support.

Q: Does the difference in Moisture Sensitivity Level (MSL) affect compatibility?

A: No. MSL 2 (1 Year) for the CY74FCT157CTQCT is a standard specification for modern surface mount components and does not impact electrical or functional compatibility. Standard moisture control practices during storage and assembly are sufficient.

Q: Are both components RoHS compliant?

A: The CY74FCT157CTQCT is ROHS3 compliant. RoHS compliance status for the 74FCT157ATQG is not specified in the available data.