74F573SCX Equivalent & Substitute Parts

Part Overview

The 74F573SCX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-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 74F series logic family provides standard digital latch functionality suitable for data storage and bus interface applications.

Substiute Parts

74F573SCX

onsemiIn Stock: 207474F573SCX Datasheet

Current PartRFQ

SN74F573DW

Texas InstrumentsIn Stock: 2234SN74F573DW Datasheet

DirectRFQ

SN74F573DWR

Texas InstrumentsIn Stock: 2576SN74F573DWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F573SCX are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Substitution Criteria:

• Logic Type: D-Type Transparent Latch (identical function)
• Circuit Configuration: 8:8 (identical channel and bit width)
• Output Type: Tri-State (identical output control capability)
• Package / Case: 20-SOIC (identical physical footprint and pin count)
• Voltage - Supply: 4.5V ~ 5.5V (identical operating voltage range)
• Operating Temperature: 0°C ~ 70°C (identical temperature range)
• Mounting Type: Surface Mount (identical assembly method)

The substitute parts SN74F573DW and SN74F573DWR, both manufactured by Texas Instruments, meet all core substitution criteria. These parts maintain identical logic functionality, circuit topology, electrical specifications, and physical packaging, enabling direct replacement in existing designs and new implementations.

Parameter Comparison

Engineering Selection Recommendations

SN74F573DWR (Texas Instruments) - Recommended Primary Substitute

The SN74F573DWR is the preferred substitute for the obsolete 74F573SCX. This part carries Active product status, ensuring long-term availability and continued manufacturer support. It is ROHS3 compliant, meeting current environmental and regulatory requirements. The Tape & Reel packaging format supports high-volume manufacturing and automated assembly processes. Propagation delay of 8.6ns remains within acceptable performance parameters for standard 74F logic applications.

SN74F573DW (Texas Instruments) - Secondary Substitute

The SN74F573DW provides equivalent functionality with Last Time Buy status, indicating limited future availability. This part is ROHS3 compliant and supplied in Tube packaging, suitable for lower-volume applications and manual assembly. Propagation delay specifications match the SN74F573DWR variant.

Both Texas Instruments substitutes maintain full electrical and mechanical compatibility with the 74F573SCX across all critical parameters, enabling direct replacement without circuit redesign or board layout modification.

Frequently Asked Questions (FAQ)

Q: Can SN74F573DW and SN74F573DWR be used interchangeably with 74F573SCX?

A: Yes. Both Texas Instruments parts are direct functional equivalents. They share identical logic type, circuit configuration, output type, package, voltage range, temperature range, and output current specifications. The primary difference is packaging format (Tube vs. Tape & Reel) and product lifecycle status.

Q: What is the significance of the propagation delay difference (5.3ns vs. 8.6ns)?

A: The 74F573SCX specifies 5.3ns propagation delay, while both substitute parts specify 8.6ns. This 3.3ns difference is within typical 74F logic family tolerances and does not affect functional compatibility in standard digital latch applications. System timing analysis should confirm acceptability for specific circuit requirements.

Q: Why is SN74F573DWR recommended over SN74F573DW?

A: SN74F573DWR carries Active product status, ensuring continued availability and manufacturer support. SN74F573DW is designated Last Time Buy, indicating limited future supply. For new designs and long-term production, SN74F573DWR provides supply chain stability.

Q: Are there any compliance differences between the main part and substitutes?

A: The 74F573SCX compliance status is not specified in available documentation. Both SN74F573DW and SN74F573DWR are ROHS3 compliant, meeting current environmental regulations. Both parts carry REACH Unaffected status and EAR99 export classification, matching the main part specifications.

Q: Does the packaging format affect electrical performance?

A: No. Tube and Tape & Reel packaging formats contain identical die and internal construction. Packaging differences affect only handling, storage, and assembly processes. Electrical specifications and performance are identical between packaging variants.

Q: Can the 74F573SCX be used in new designs?

A: The 74F573SCX is classified as obsolete. For new designs, SN74F573DWR is the appropriate selection due to its Active product status and assured long-term availability.