74VHCT573ASJX Equivalent & Substitute Parts

Part Overview

The 74VHCT573ASJX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOP package. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74VHCT573ASJX

onsemiIn Stock: 110574VHCT573ASJX Datasheet

Current PartRFQ

SN74AHCT573DW

Texas InstrumentsIn Stock: 27250SN74AHCT573DW Datasheet

SimilarRFQ

SN74AHCT573DWR

Texas InstrumentsIn Stock: 2208SN74AHCT573DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHCT573ASJX is determined by strict alignment across the following critical parameters:

• Logic Type & Circuit Configuration: Must be D-Type Transparent Latch with 8:8 circuit configuration
• Output Characteristics: Tri-state output capability required
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V, output current 8mA (high and low), operating temperature -40°C ~ 85°C
• Mounting & Package: Surface mount technology with 20-pin SOIC package footprint compatibility
• Independent Circuits: Single channel (1) configuration

The substitute parts identified—SN74AHCT573DW and SN74AHCT573DWR—meet all specified electrical and mechanical parameters. Both are manufactured by Texas Instruments and belong to the 74AHCT logic series, maintaining functional equivalence with the original 74VHCT573ASJX component.

Parameter Comparison

Engineering Selection Recommendations

SN74AHCT573DWR is the primary recommended substitute. This component carries Active product status from Texas Instruments, ensuring continued availability and supply chain stability. It maintains full electrical and functional equivalence to the 74VHCT573ASJX while offering ROHS3 compliance and superior propagation delay performance (1ns versus 5.1ns). The Cut Tape and Digi-Reel packaging format supports both prototype and production-volume applications.

SN74AHCT573DW serves as a secondary alternative, offering identical electrical specifications and ROHS3 compliance. However, its Last Time Buy status indicates limited future availability, making it suitable only for applications with defined end-of-life timelines.

Both substitutes feature 20-SOIC packages with slightly larger body dimensions (0.295" versus 0.209" width) compared to the original component. PCB layout verification is required to confirm mechanical compatibility within existing footprints.

Frequently Asked Questions (FAQ)

Q: Can SN74AHCT573DW and SN74AHCT573DWR be used interchangeably with 74VHCT573ASJX?

A: Both Texas Instruments components meet all specified electrical parameters (supply voltage, output current, operating temperature, logic function, and circuit configuration). Functional substitution is valid. Physical package dimensions differ slightly (0.295" versus 0.209" width), requiring PCB footprint verification.

Q: What is the significance of the propagation delay difference (5.1ns vs. 1ns)?

A: The substitute parts exhibit faster propagation delay, which is a performance improvement. This faster response time is compatible with systems designed for the original 5.1ns specification and does not create functional incompatibility.

Q: Why is SN74AHCT573DWR recommended over SN74AHCT573DW?

A: SN74AHCT573DWR maintains Active product status, ensuring long-term availability and supply continuity. SN74AHCT573DW is designated Last Time Buy, indicating limited future procurement windows.

Q: Are there package compatibility concerns?

A: Both substitute parts use 20-SOIC packaging but with different body widths (7.50mm versus 5.30mm). Verify that existing PCB footprints accommodate the larger package dimension before implementation.

Q: Do the substitute parts meet compliance requirements?

A: Both SN74AHCT573DW and SN74AHCT573DWR are ROHS3 compliant. Both carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original component.