74ACT573SJ D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACT573SJ is a D-Type Transparent Latch 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 part operates within the 4.5V to 5.5V supply voltage range with a 6ns propagation delay and 24mA output current capability in both high and low states.

Substiute Parts

74ACT573SJ

onsemiIn Stock: 230274ACT573SJ Datasheet

Current PartRFQ

SN74ACT573NSR

Texas InstrumentsIn Stock: 2810SN74ACT573NSR Datasheet

DirectRFQ

CD74ACT573M

Harris CorporationIn Stock: 2217CD74ACT573M Datasheet

SimilarRFQ

CD74ACT573M96

Harris CorporationIn Stock: 1927CD74ACT573M96 Datasheet

SimilarRFQ

SN74ACT573DW

Texas InstrumentsIn Stock: 2818SN74ACT573DW Datasheet

SimilarRFQ

SN74ACT573DWR

Texas InstrumentsIn Stock: 14076SN74ACT573DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT573SJ is determined by strict equivalence across the following critical parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Supply Voltage Range: 4.5V ~ 5.5V
• Independent Circuits: 1
• Propagation Delay: 6ns (primary specification)
• Output Current: 24mA (both high and low states)
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Base Product Number: 74ACT573

Substitute parts are classified into two categories: Direct Substitutes (identical electrical and mechanical specifications with active product status) and Similar Substitutes (functionally equivalent but with variations in package dimensions, operating temperature range, or product status).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74ACT573NSR (Texas Instruments)

The SN74ACT573NSR is the recommended direct substitute for the 74ACT573SJ. This part maintains identical electrical specifications (6ns propagation delay, 24mA output current, -40°C to 85°C operating range) and package dimensions (20-SOIC 0.209" width). The part holds Active product status and is ROHS3 compliant, ensuring long-term availability and regulatory compliance. Packaging is supplied in Tape & Reel format suitable for automated assembly.

Secondary Substitute: SN74ACT573DWR (Texas Instruments)

The SN74ACT573DWR provides functional equivalence with identical electrical performance and Active product status. This part differs in package dimensions (20-SOIC 0.295" width) and is also ROHS3 compliant. The larger package width may require PCB layout verification before implementation.

Alternative Substitutes: CD74ACT573M and CD74ACT573M96 (Harris Corporation)

Both Harris Corporation parts (CD74ACT573M and CD74ACT573M96) offer improved propagation delay performance (3.1ns versus 6ns) and extended operating temperature range (-55°C to 125°C). However, both are classified as Obsolete and are RoHS non-compliant. These parts are suitable only when extended temperature performance is required and regulatory compliance is not a constraint.

Discontinued Part: SN74ACT573DW (Texas Instruments)

The SN74ACT573DW is discontinued at DiGi Electronics and should not be selected for new designs despite maintaining electrical equivalence to the original part.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT573NSR be used as a direct replacement for 74ACT573SJ?

A: Yes. The SN74ACT573NSR is electrically and mechanically equivalent to the 74ACT573SJ. Both parts share identical propagation delay (6ns), output current (24mA), operating temperature range (-40°C to 85°C), and package dimensions (20-SOIC 0.209" width). The primary advantage is Active product status and ROHS3 compliance.

Q: What is the difference between the 0.209" and 0.295" package widths?

A: These dimensions refer to the physical width of the 20-SOIC package body. The 0.209" width (narrow body) is used by SN74ACT573NSR, while the 0.295" width (wide body) is used by CD74ACT573M, CD74ACT573M96, SN74ACT573DW, and SN74ACT573DWR. PCB footprints must match the selected package width; parts are not interchangeable on the same PCB layout without modification.

Q: Why do CD74ACT573M and CD74ACT573M96 have faster propagation delay?

A: The 3.1ns propagation delay specification for Harris parts differs from the 6ns specification of the original part. This represents a different device variant within the 74ACT573 family. Faster propagation delay does not affect functional compatibility but may impact timing-critical applications.

Q: Are all substitute parts RoHS compliant?

A: No. SN74ACT573NSR and SN74ACT573DWR are ROHS3 compliant. CD74ACT573M and CD74ACT573M96 are RoHS non-compliant. Compliance requirements depend on end-use application and regional regulations.

Q: What is the difference between Tape & Reel and Tube packaging?

A: Tape & Reel packaging is optimized for automated pick-and-place assembly and is the standard for high-volume production. Tube packaging is used for lower-volume applications and manual assembly. Both packaging formats contain the same electronic component; the difference is in handling and assembly methodology.

Q: Can I use SN74ACT573DWR in place of SN74ACT573NSR?

A: Yes, with PCB layout verification. Both parts are electrically identical and Active. The difference is package width (0.295" versus 0.209"), which requires confirmation that the PCB footprint accommodates the wider body dimension.