74AC573SC Equivalent & Substitute Parts

Part Overview

The 74AC573SC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74AC573 series provides transparent latch functionality suitable for data storage and bus interface applications in digital logic systems.

Substiute Parts

74AC573SC

onsemiIn Stock: 105174AC573SC Datasheet

Current PartRFQ

MC74AC573DWG

onsemiIn Stock: 3269MC74AC573DWG Datasheet

DirectRFQ

MC74AC573DWR2G

onsemiIn Stock: 1952MC74AC573DWR2G Datasheet

SimilarRFQ

SN74AC573DW

Texas InstrumentsIn Stock: 3219SN74AC573DW Datasheet

DirectRFQ

CD74AC573M

Texas InstrumentsIn Stock: 1643CD74AC573M Datasheet

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CD74AC573M96

Texas InstrumentsIn Stock: 9662CD74AC573M96 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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SN74AC373DW

Texas InstrumentsIn Stock: 2420SN74AC373DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC573SC is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Voltage Supply Range: 2V ~ 6V (minimum overlap requirement)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Current Output: 24mA / 24mA
• Operating Temperature: -40°C ~ 85°C (minimum overlap requirement)

Packaging Variants: Substitute parts may differ in packaging format (Tube, Tape & Reel, Cut Tape) without affecting electrical compatibility, as these represent distribution methods only.

Propagation Delay Tolerance: Propagation delay variations (2.5ns to 10ns) are acceptable within the 74AC logic family specifications and do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status):

• MC74AC573DWG and MC74AC573DWR2G (onsemi) provide direct electrical and mechanical compatibility with active product status, ensuring long-term availability and supply chain continuity.
• SN74AC573DWR (Texas Instruments) offers active status with improved propagation delay performance (2.5ns) and RoHS3 compliance.

Secondary Substitutes (Limited Availability):

• SN74AC573NSR (Texas Instruments) maintains active status but uses a narrower 20-SO package (5.30mm width) compared to the standard 20-SOIC (7.50mm width), requiring PCB layout verification.
• CD74AC573M96 (Texas Instruments) provides active status with extended operating temperature range (-55°C ~ 125°C) and wider voltage supply tolerance (1.5V ~ 5.5V), suitable for demanding environmental applications.

Discontinued Parts (Not Recommended for New Designs):

• SN74AC573DW, SN74AC573DWG4, and SN74AC373DW are discontinued at DiGi Electronics and should not be selected for new production designs.
• CD74AC573M carries Last Time Buy status and represents end-of-life inventory.

Compliance Considerations: All substitute parts maintain RoHS3 compliance and REACH unaffected status, consistent with the original 74AC573SC specifications.

Frequently Asked Questions (FAQ)

Q: Can MC74AC573DWG replace 74AC573SC directly? A: Yes. MC74AC573DWG meets all critical electrical parameters (8:8 circuit, tri-state output, 2V ~ 6V supply, 24mA output current) and uses the identical 20-SOIC package. The 10ns propagation delay is within acceptable 74AC logic family tolerance. Packaging format (Tube) differs from the original but does not affect electrical function.

Q: What is the difference between SN74AC573DWR and SN74AC573DW? A: Both parts are electrically identical with 2.5ns propagation delay and 20-SOIC packaging. The primary difference is packaging format: SN74AC573DWR uses Cut Tape & Digi-Reel distribution (active status), while SN74AC573DW uses Tube distribution (discontinued at DiGi Electronics). SN74AC573DWR is recommended for new designs.

Q: Why does SN74AC573NSR have a different package designation (20-SO vs. 20-SOIC)? A: SN74AC573NSR uses a 20-SO package with 5.30mm width, compared to the standard 20-SOIC with 7.50mm width. Both are surface-mount SOIC variants with identical pin counts and electrical specifications. PCB footprint verification is required before substitution, as the narrower package may not be compatible with existing board layouts designed for the wider 20-SOIC.

Q: Can CD74AC573M96 be used in applications requiring -40°C ~ 85°C operation? A: Yes. CD74AC573M96 supports the extended temperature range of -55°C ~ 125°C, which encompasses the -40°C ~ 85°C requirement. The wider voltage supply range (1.5V ~ 5.5V) also provides additional design margin compared to the 2V ~ 6V specification of 74AC573SC.

Q: Are there functional differences between 74AC573 and 74AC373 series parts? A: SN74AC373DW is a parametric equivalent with identical circuit configuration (8:8), output type (tri-state), and package (20-SOIC). The 7.5ns propagation delay differs from the original 8.5ns but remains within acceptable logic family specifications. Both parts function as D-Type Transparent Latches and are electrically interchangeable.

Q: What does "Last Time Buy" status mean for CD74AC573M? A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but no future production is planned. This status makes CD74AC573M unsuitable for new designs; active alternatives such as CD74AC573M96 or MC74AC573DWG are recommended.