74ACT573SC Equivalent & Substitute Parts

Part Overview

The 74ACT573SC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 8:8 circuit configuration with 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 74ACT573 series maintains consistent functional characteristics across multiple manufacturers and packaging variants, enabling direct substitution based on electrical and mechanical parameter alignment.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.5V ~ 5.5V
Propagation Delay	6ns
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Independent Circuits	1

Substitute Part Grouping Explanation

Substitution of the 74ACT573SC is determined by the following critical parameters:

Primary Substitution Criteria:

Logic Type: D-Type Transparent Latch (must match)
Circuit Configuration: 8:8 (must match for direct pin-compatible substitution)
Output Type: Tri-State (must match)
Supply Voltage: 4.5V ~ 5.5V (must match)
Output Current: 24mA / 24mA (must match)
Package Type: 20-SOIC with 0.295" width (must match for PCB compatibility)
Mounting Type: Surface Mount (must match)

Secondary Consideration:

Propagation Delay: 6ns baseline; parts with equal or faster delay are acceptable
Operating Temperature: -40°C ~ 85°C baseline; extended ranges are acceptable
Product Status: Active parts preferred over obsolete for long-term availability

Substitute parts are grouped into two categories:

Direct Equivalents (8:8 Configuration): Parts maintaining identical circuit configuration, package dimensions, and electrical specifications as the 74ACT573SC.

Similar Parts (1:8 Configuration): Parts with different circuit configuration (1:8 instead of 8:8) that share the same base product number but differ in functional arrangement and are not pin-compatible.

Parameter Comparison

Part Number	Manufacturer	Circuit Config	Propagation Delay	Operating Temp	Package	Product Status	RoHS Status
74ACT573SC	onsemi	8:8	6ns	-40°C ~ 85°C	20-SOIC (0.295")	Obsolete	REACH Unaffected
SN74ACT573DWR	Texas Instruments	8:8	6ns	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74ACT573DW	Texas Instruments	8:8	6ns	-40°C ~ 85°C	20-SOIC (0.295")	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74ACT573NSR	Texas Instruments	8:8	6ns	-40°C ~ 85°C	20-SO (0.209")	Active	ROHS3 Compliant
CD74ACT573M	Harris Corporation	8:8	3.1ns	-55°C ~ 125°C	20-SOIC (0.295")	Obsolete	RoHS non-compliant
CD74ACT573M96	Harris Corporation	8:8	3.1ns	-55°C ~ 125°C	20-SOIC (0.295")	Obsolete	RoHS non-compliant
MC74ACT573DWG	onsemi	1:8	10.5ns	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
MC74ACT573DWR2G	onsemi	1:8	10.5ns	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitute: SN74ACT573DWR

The SN74ACT573DWR from Texas Instruments is the optimal substitute for the 74ACT573SC. This part maintains complete electrical and mechanical compatibility with identical circuit configuration (8:8), propagation delay (6ns), output current specifications (24mA/24mA), and package dimensions (20-SOIC, 0.295" width). The part is currently in active production status, ensuring long-term availability and supply chain stability. ROHS3 compliance provides regulatory alignment for modern manufacturing environments.

Secondary Substitute: SN74ACT573DW

The SN74ACT573DW offers identical electrical specifications and package compatibility but carries a discontinued status at DiGi Electronics. This part remains suitable for applications where existing inventory is available but should not be selected for new designs requiring guaranteed long-term procurement.

Alternative with Extended Temperature Range: CD74ACT573M or CD74ACT573M96

The Harris Corporation CD74ACT573M and CD74ACT573M96 variants provide faster propagation delay (3.1ns versus 6ns) and extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C). Both parts are obsolete and RoHS non-compliant. Selection of these parts is appropriate only when extended temperature performance is a critical design requirement and inventory availability can be confirmed.

Package Variant: SN74ACT573NSR

The SN74ACT573NSR from Texas Instruments maintains 8:8 circuit configuration and identical electrical specifications but uses a narrower 20-SO package (0.209" width versus 0.295"). This part is not pin-compatible with the original 74ACT573SC due to different package dimensions and should only be selected if PCB layout accommodates the narrower package footprint.

Not Recommended for Direct Substitution: MC74ACT573DWG and MC74ACT573DWR2G

The MC74ACT573DWG and MC74ACT573DWR2G variants feature 1:8 circuit configuration instead of 8:8, resulting in different pin assignments and functional behavior. These parts are not pin-compatible with the 74ACT573SC and cannot serve as direct substitutes despite sharing the same base product number and package type.

Frequently Asked Questions (FAQ)

Q: Can the MC74ACT573DWG or MC74ACT573DWR2G be used as substitutes for the 74ACT573SC?

A: No. Although these parts share the same base product number (74ACT573) and package type (20-SOIC), they feature a different circuit configuration (1:8 instead of 8:8). This difference results in incompatible pin assignments and functional behavior. Direct substitution is not possible without circuit redesign.

Q: What is the difference between the SN74ACT573DWR and SN74ACT573DW?

A: Both parts are electrically and mechanically identical with matching circuit configuration (8:8), propagation delay (6ns), and package dimensions (20-SOIC, 0.295" width). The primary difference is product status: SN74ACT573DWR is in active production, while SN74ACT573DW is discontinued at DiGi Electronics. For new designs, SN74ACT573DWR is the preferred choice for supply continuity.

Q: Why is the SN74ACT573NSR not recommended as a direct substitute?

A: The SN74ACT573NSR uses a narrower 20-SO package (0.209" width) compared to the original 74ACT573SC (20-SOIC, 0.295" width). This dimensional difference results in a different PCB footprint and is not pin-compatible without layout modification. Selection of this part requires PCB redesign.

Q: Can the CD74ACT573M be used if faster propagation delay is needed?

A: The CD74ACT573M offers faster propagation delay (3.1ns versus 6ns) and extended operating temperature range (-55°C ~ 125°C). However, this part is obsolete and RoHS non-compliant. It should only be selected if inventory is available and extended temperature performance is a critical design requirement. For new designs, SN74ACT573DWR is the recommended choice.

Q: Are all substitute parts RoHS compliant?

A: No. The CD74ACT573M and CD74ACT573M96 are RoHS non-compliant. The SN74ACT573DWR, SN74ACT573DW, SN74ACT573NSR, MC74ACT573DWG, and MC74ACT573DWR2G are ROHS3 compliant. For applications requiring RoHS compliance, select from the ROHS3 compliant variants.

Q: What packaging options are available for the 74ACT573 series?

A: The 74ACT573 series is available in multiple packaging formats: Tube, Tape & Reel (TR), and Bulk. The package type (20-SOIC or 20-SO) determines PCB footprint compatibility. Packaging format (Tube, TR, Bulk) affects procurement quantity and handling but does not impact electrical or mechanical compatibility.

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