74AC573SJ D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74AC573SJ 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 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74AC573 series maintains functional compatibility across multiple manufacturers and packaging variants, enabling direct substitution based on electrical and mechanical parameter alignment.

Substiute Parts

74AC573SJ

onsemiIn Stock: 78474AC573SJ Datasheet

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MC74AC573DWR2G

onsemiIn Stock: 1952MC74AC573DWR2G Datasheet

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CD74AC573M

Texas InstrumentsIn Stock: 1643CD74AC573M Datasheet

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CD74AC573M96

Texas InstrumentsIn Stock: 9662CD74AC573M96 Datasheet

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SN74AC573DW

Texas InstrumentsIn Stock: 3219SN74AC573DW Datasheet

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SN74AC573DWG4

Texas InstrumentsIn Stock: 965SN74AC573DWG4 Datasheet

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SN74AC573DWR

Texas InstrumentsIn Stock: 6012SN74AC573DWR Datasheet

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SN74AC573NSR

Texas InstrumentsIn Stock: 792SN74AC573NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC573SJ is determined by the following critical parameters:

Functional Compatibility Requirements:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Independent Circuits: 1

Electrical Compatibility Requirements:

• Voltage Supply Range: Must encompass or match 2V ~ 6V
• Output Current: 24mA minimum for both High and Low states
• Propagation Delay: Acceptable within design timing constraints

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount
• Package Case: 20-SOIC or 20-SO variants with compatible pin configuration

All substitute parts listed maintain the base product number 74AC573 and satisfy these core substitution criteria. Variations in propagation delay, operating temperature range, and packaging format (tape & reel, tube, cut tape) do not affect functional substitutability but may impact application-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: SN74AC573NSR is the optimal substitute for 74AC573SJ. Both parts share identical package dimensions (20-SOIC 0.209", 5.30mm Width), matching the original PCB footprint without layout modification. SN74AC573NSR maintains active product status with ROHS3 compliance and superior propagation delay (2.5ns vs 8.5ns), providing performance enhancement with no functional compromise.

Alternative Recommendations:

For applications requiring extended operating temperature range (-55°C to 125°C) and lower propagation delay (3ns), CD74AC573M96 provides active product status with ROHS3 compliance. This part requires PCB footprint adjustment due to package width difference (7.50mm vs 5.30mm) but offers broader environmental specifications.

SN74AC573DWR serves as an active alternative with matching voltage supply range (2V ~ 6V) and operating temperature (-40°C ~ 85°C). This part requires footprint modification and is available in cut tape and digi-reel packaging.

MC74AC573DWR2G maintains onsemi manufacturer continuity with active product status and ROHS3 compliance, though propagation delay (10ns) is higher than the original specification.

Avoid: CD74AC573M and SN74AC573DW are classified as Last Time Buy and Discontinued at DiGi Electronics respectively, making them unsuitable for new designs or long-term procurement.

Frequently Asked Questions (FAQ)

Q: Can SN74AC573NSR replace 74AC573SJ without PCB modification? A: Yes. Both parts use identical 20-SOIC packaging with 0.209" (5.30mm) width, ensuring direct footprint compatibility without layout changes.

Q: What is the primary reason for substitution? A: The 74AC573SJ is classified as obsolete. Active alternatives ensure design continuity and long-term component availability.

Q: Does faster propagation delay in substitute parts affect compatibility? A: No. Faster propagation delay (2.5ns to 3ns vs 8.5ns) improves timing performance without creating functional incompatibility. Applications designed for 8.5ns delay operate correctly with faster substitutes.

Q: Are all substitute parts RoHS compliant? A: All active and last-time-buy substitute parts listed are ROHS3 compliant. The original 74AC573SJ does not specify RoHS status.

Q: What is the difference between CD74AC573M and CD74AC573M96? A: Both are Texas Instruments parts with identical electrical specifications. CD74AC573M is Last Time Buy; CD74AC573M96 is Active. CD74AC573M96 is recommended for new designs.

Q: Can I use parts with different package widths (5.30mm vs 7.50mm)? A: Package width differences require PCB footprint modification. SN74AC573NSR maintains the original 5.30mm width for direct replacement. Wider packages (7.50mm) require layout adjustment.

Q: What is the voltage supply compatibility range? A: The original 74AC573SJ operates at 2V ~ 6V. Substitute parts either match this range or provide broader compatibility (1.5V ~ 5.5V for Texas Instruments CD74AC573 variants). All substitutes are compatible with the original supply voltage specification.

Q: Are there packaging format differences among substitutes? A: Yes. Substitutes are available in tube, tape & reel (TR), and cut tape (CT) formats. Packaging format does not affect electrical or mechanical compatibility but may impact procurement and assembly processes.