74AC573SJX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74AC573SJX is a D-Type Transparent Latch IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-SOP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply voltage range with a propagation delay of 8.5ns and supports surface mount applications.

Substiute Parts

74AC573SJX

onsemiIn Stock: 104474AC573SJX Datasheet

Current PartRFQ

CD74AC573M

Texas InstrumentsIn Stock: 1643CD74AC573M Datasheet

SimilarRFQ

CD74AC573M96

Texas InstrumentsIn Stock: 9662CD74AC573M96 Datasheet

SimilarRFQ

SN74AC573DW

Texas InstrumentsIn Stock: 3219SN74AC573DW Datasheet

SimilarRFQ

SN74AC573DWG4

Texas InstrumentsIn Stock: 965SN74AC573DWG4 Datasheet

SimilarRFQ

SN74AC573DWR

Texas InstrumentsIn Stock: 6012SN74AC573DWR Datasheet

SimilarRFQ

SN74AC573NSR

Texas InstrumentsIn Stock: 792SN74AC573NSR Datasheet

SimilarRFQ

SN74AC373NSR

Texas InstrumentsIn Stock: 2896SN74AC373NSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC573SJX is determined by the following critical parameters:

Functional Equivalence: All substitute parts must maintain the D-Type Transparent Latch logic type with 8:8 circuit configuration and tri-state output capability.

Electrical Compatibility: Supply voltage range, output current ratings (24mA minimum for both high and low states), and propagation delay characteristics must support the original application requirements.

Package Compatibility: Physical package dimensions and mounting type (surface mount) must accommodate existing PCB layouts. The 20-SOIC package family includes variants with different body widths (0.209" and 0.295"), which may require PCB footprint verification.

Product Status Consideration: Active and Last Time Buy status parts provide better long-term availability compared to discontinued or obsolete classifications.

Compliance Standards: RoHS3 compliance and REACH unaffected status ensure regulatory alignment for new designs and procurement.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): SN74AC573NSR is the preferred substitute for the 74AC573SJX. Both parts share identical package dimensions (20-SOIC 0.209" width), matching supply voltage range (2V ~ 6V), operating temperature range (-40°C ~ 85°C), and output current specifications (24mA). The SN74AC573NSR maintains active product status with RoHS3 compliance, ensuring long-term availability and regulatory alignment.

Alternative with Enhanced Performance: SN74AC573DWR offers faster propagation delay (2.5ns versus 8.5ns) and active product status. The wider package body (0.295" versus 0.209") requires PCB footprint verification before implementation. This part is suitable for applications where improved timing performance is beneficial and PCB layout accommodates the larger package.

Extended Temperature Range Option: CD74AC573M96 provides the widest operating temperature range (-55°C ~ 125°C) and fastest propagation delay (3ns) with active product status. The wider package body and lower supply voltage floor (1.5V minimum) require design verification. This part is appropriate for industrial or extended-temperature applications.

Parametric Equivalent: SN74AC373NSR shares the same package footprint and electrical specifications as the 74AC573SJX but uses a different base product number (74AC373 versus 74AC573). Functional compatibility must be verified against specific application requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC573DWR as a direct replacement for 74AC573SJX?

A: SN74AC573DWR is functionally equivalent but requires PCB footprint verification. The package body width differs (0.295" versus 0.209"), which may affect land pattern compatibility. Electrical parameters (supply voltage, output current, operating temperature) are compatible. Verify PCB layout before implementation.

Q: What is the difference between CD74AC573M and CD74AC573M96?

A: Both parts are functionally identical D-Type Transparent Latches with 8:8 configuration. CD74AC573M is packaged in Tube format with Last Time Buy status, while CD74AC573M96 is packaged in Tape & Reel format with Active status. CD74AC573M96 is recommended for new designs due to active product status and better long-term availability.

Q: Is SN74AC373NSR compatible with designs using 74AC573SJX?

A: SN74AC373NSR is a parametric equivalent with matching package dimensions and electrical specifications. However, the base product number differs (74AC373 versus 74AC573), indicating a different internal circuit design. Functional compatibility must be verified against application-specific requirements before substitution.

Q: Why do some substitute parts have lower supply voltage minimums (1.5V versus 2V)?

A: Texas Instruments parts (CD74AC573M, CD74AC573M96) specify 1.5V minimum supply voltage, while onsemi and other Texas Instruments variants specify 2V minimum. Both ranges are compatible with standard 3.3V and 5V logic systems. Applications operating below 2V require verification of the lower-voltage parts.

Q: Which substitute part offers the best long-term availability?

A: CD74AC573M96 and SN74AC573DWR both maintain Active product status, providing the best long-term procurement continuity. CD74AC573M96 is available in Tape & Reel packaging with the highest inventory level (9617 pcs), making it the optimal choice for volume production.

Q: Are all substitute parts RoHS3 compliant?

A: All Texas Instruments substitute parts listed (CD74AC573M, CD74AC573M96, SN74AC573DW, SN74AC573DWG4, SN74AC573DWR, SN74AC573NSR, SN74AC373NSR) are RoHS3 compliant. The original onsemi part (74AC573SJX) does not specify RoHS status. Verify compliance requirements for your application before final part selection.