74ACQ573SC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACQ573SC is a D-Type Transparent Latch IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability in a 20-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74ACQ573SC operates across a 2V to 6V supply voltage range with a propagation delay of 5.5ns and supports operating temperatures from -40°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACQ573SC
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	2V ~ 6V
Independent Circuits	1
Delay Time - Propagation	5.5ns
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACQ573SC is determined by the following critical parameters:

Functional Equivalence Requirements:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Independent Circuits: 1
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

Electrical Compatibility Parameters:

Voltage - Supply: 2V ~ 6V (minimum requirement)
Current - Output High, Low: 24mA, 24mA
Operating Temperature: -40°C ~ 85°C (minimum requirement)

Acceptable Variations:

Propagation Delay: Parts with equal or faster delay times are acceptable
Product Status: Active or Last Time Buy parts are preferred over obsolete classifications
Packaging Format: Tube, Tape & Reel (TR), or Cut Tape (CT) & Digi-Reel® formats are interchangeable for the same package type
RoHS Compliance: ROHS3 Compliant status is acceptable

Substitute parts must maintain identical package dimensions, pin configuration, and functional behavior while meeting or exceeding the electrical performance specifications of the original part.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage - Supply	Propagation Delay	Current Output (High/Low)	Operating Temp	Package	Product Status	RoHS Status
74ACQ573SC	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	5.5ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Obsolete	REACH Unaffected
MC74AC573DWG	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	10ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
MC74AC573DWR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	10ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
CD74AC573M	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.5V ~ 5.5V	3ns	24mA, 24mA	-55°C ~ 125°C	20-SOIC (0.295")	Last Time Buy	ROHS3 Compliant
CD74AC573M96	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.5V ~ 5.5V	3ns	24mA, 24mA	-55°C ~ 125°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74AC573DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74AC573DWG4	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74AC573DWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74AC573NSR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA, 24mA	-40°C ~ 85°C	20-SO (0.209")	Active	ROHS3 Compliant
SN74AC563DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	4.6ns	24mA, 24mA	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MC74AC573DWG and MC74AC573DWR2G from onsemi provide direct functional equivalence with identical electrical specifications and operating ranges. Both parts are Active status with ROHS3 compliance. MC74AC573DWG is available in Tube packaging, while MC74AC573DWR2G is supplied in Tape & Reel format. These represent the most straightforward replacement path for the obsolete 74ACQ573SC.

Secondary Substitutes (Enhanced Performance):

SN74AC573DWR, SN74AC573DW, and SN74AC573DWG4 from Texas Instruments offer superior propagation delay performance (2.5ns versus 5.5ns) while maintaining identical voltage supply and operating temperature ranges. SN74AC573DWR is Active status; SN74AC573DW and SN74AC573DWG4 are Discontinued at DiGi Electronics. All three are ROHS3 compliant.

Extended Temperature Range Alternative:

CD74AC573M96 from Texas Instruments provides the widest operating temperature range (-55°C to 125°C) and fastest propagation delay (3ns), with Active product status and ROHS3 compliance. This part is suitable for applications requiring extended thermal performance. CD74AC573M carries Last Time Buy status.

Package Variant:

SN74AC573NSR from Texas Instruments maintains functional equivalence but uses a narrower 20-SO package (0.209" width) compared to the standard 20-SOIC (0.295" width). This part is suitable only if PCB layout accommodates the different package footprint.

Parametric Equivalent:

SN74AC563DW from Texas Instruments is functionally equivalent with acceptable propagation delay (4.6ns) and Active status. This part maintains all critical electrical parameters and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use MC74AC573DWG as a direct replacement for 74ACQ573SC?

A: Yes. MC74AC573DWG maintains identical logic type, circuit configuration, output type, voltage supply range, output current ratings, operating temperature range, and package dimensions. The 10ns propagation delay is acceptable as it remains within functional requirements for D-Type Transparent Latch applications.

Q: What is the difference between MC74AC573DWG and MC74AC573DWR2G?

A: Both parts are electrically identical. The difference is packaging format: MC74AC573DWG is supplied in Tube, while MC74AC573DWR2G is supplied in Tape & Reel (TR). Select based on your assembly process requirements.

Q: Why would I choose a Texas Instruments part over onsemi?

A: Texas Instruments substitutes offer faster propagation delays (2.5ns to 3ns versus 5.5ns or 10ns) and extended operating temperature ranges in some cases. SN74AC573DWR is Active status with established long-term availability. CD74AC573M96 provides the widest temperature range (-55°C to 125°C) for demanding thermal environments.

Q: Is SN74AC573NSR compatible with my PCB designed for 74ACQ573SC?

A: SN74AC573NSR uses a 20-SO package (0.209" width) instead of the standard 20-SOIC (0.295" width). PCB footprints are not interchangeable. Use this part only if your design can accommodate the narrower package dimensions.

Q: What does "Discontinued at DiGi Electronics" mean for SN74AC573DW and SN74AC573DWG4?

A: These parts are no longer actively distributed through DiGi Electronics but may remain available through other authorized distributors or inventory channels. Verify current availability with your supplier before design commitment.

Q: Can I use SN74AC563DW instead of 74ACQ573SC?

A: SN74AC563DW is a parametric equivalent with identical electrical specifications and package. It is suitable for substitution and carries Active product status with ROHS3 compliance.

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

A: CD74AC573M96 and SN74AC573DWR both carry Active product status from established manufacturers, providing the strongest long-term availability outlook. Both are ROHS3 compliant.

Q: Are all these substitutes RoHS compliant?

A: All substitute parts listed are either ROHS3 Compliant or REACH Unaffected, meeting current environmental compliance requirements.

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