74ACT573SJX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACT573SJX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output capability 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 within the 4.5V to 5.5V supply voltage range and is suitable for applications requiring transparent latch functionality with tri-state output control.

Substiute Parts

74ACT573SJX

onsemiIn Stock: 88774ACT573SJX Datasheet

Current PartRFQ

MC74ACT573DWR2G

onsemiIn Stock: 2225MC74ACT573DWR2G Datasheet

SimilarRFQ

CD74ACT573M

Harris CorporationIn Stock: 2217CD74ACT573M Datasheet

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CD74ACT573M96

Harris CorporationIn Stock: 1927CD74ACT573M96 Datasheet

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SN74ACT573DW

Texas InstrumentsIn Stock: 2818SN74ACT573DW Datasheet

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SN74ACT573DWR

Texas InstrumentsIn Stock: 14076SN74ACT573DWR Datasheet

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SN74ACT573NSR

Texas InstrumentsIn Stock: 2810SN74ACT573NSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT573SJX is determined by the following critical parameters:

• Logic Type & Circuit Configuration: All substitute parts must be D-Type Transparent Latch devices with 8:8 circuit configuration to maintain functional equivalence
• Output Type: Tri-state output capability is required for direct substitution
• Supply Voltage: 4.5V ~ 5.5V compatibility is mandatory
• Output Current: 24mA high and low output current capability must be maintained
• Mounting Type: Surface mount technology is required
• Package Compatibility: Parts in 20-SOIC or 20-SOP packages are acceptable substitutes

Substitute parts are grouped into two categories:

Direct Equivalents (8:8 Configuration, Active or Discontinued Status): SN74ACT573DWR, SN74ACT573DW, CD74ACT573M, CD74ACT573M96

Parametric Equivalent (8:8 Configuration, Different Package Variant): SN74ACT573NSR (20-SO package variant)

Non-Equivalent (Different Circuit Configuration): MC74ACT573DWR2G features a 1:8 circuit configuration and does not qualify as a direct substitute due to functional differences.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ACT573DWR

The SN74ACT573DWR from Texas Instruments is the preferred substitute for the 74ACT573SJX. This part maintains identical electrical specifications including 6ns propagation delay, 24mA output current, and -40°C to 85°C operating temperature range. The device is currently in active production status, ensuring long-term availability. It carries ROHS3 compliance and MSL 1 rating, meeting modern environmental and handling requirements. The 20-SOIC package (0.295", 7.50mm width) is slightly wider than the original 20-SOP but remains compatible with standard surface mount assembly processes.

Secondary Recommendation: SN74ACT573NSR

The SN74ACT573NSR provides an alternative with identical electrical performance and active product status. This variant uses a 20-SO package (0.209", 5.30mm width) matching the original package width, reducing potential PCB layout modifications. ROHS3 compliance and MSL 1 rating are maintained.

Alternative Consideration: CD74ACT573M or CD74ACT573M96

These Harris Corporation parts offer superior propagation delay performance (3.1ns versus 6ns) and extended operating temperature range (-55°C to 125°C). However, both are obsolete and carry RoHS non-compliant status. Selection should be limited to applications where extended temperature performance is critical and RoHS compliance is not required.

Not Recommended: MC74ACT573DWR2G

This part features a 1:8 circuit configuration, which differs functionally from the 8:8 configuration of the 74ACT573SJX. It is not suitable as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT573DWR as a direct replacement for 74ACT573SJX?

A: Yes. Both parts share identical logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage (4.5V ~ 5.5V), propagation delay (6ns), output current (24mA), and operating temperature range (-40°C ~ 85°C). The primary difference is package width (0.295" versus 0.209"), which may require minor PCB layout adjustment but does not affect electrical compatibility.

Q: What is the difference between the 20-SOIC and 20-SO packages?

A: Both are 20-pin surface mount packages with identical pin configurations and electrical performance. The primary difference is package width: 20-SOIC measures 0.295" (7.50mm) while 20-SO measures 0.209" (5.30mm). The SN74ACT573NSR uses the narrower 20-SO package, matching the original 74ACT573SJX footprint more closely.

Q: Why is the 74ACT573SJX marked as obsolete?

A: The 74ACT573SJX is no longer manufactured by onsemi. Active substitutes from Texas Instruments (SN74ACT573DWR, SN74ACT573NSR) provide equivalent functionality with current production status and modern compliance certifications.

Q: Are the CD74ACT573M and CD74ACT573M96 suitable replacements?

A: These parts are functionally compatible but are also obsolete. They offer faster propagation delay (3.1ns) and wider operating temperature range (-55°C ~ 125°C) compared to the original part. However, they are RoHS non-compliant. Use only if extended temperature performance is required and RoHS compliance is not mandated.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive, restricting the use of specific hazardous materials in electrical and electronic equipment. SN74ACT573DWR and SN74ACT573NSR are ROHS3 compliant, while CD74ACT573M and CD74ACT573M96 are not.

Q: Does MSL 1 rating affect my assembly process?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture control requirements. Both the original 74ACT573SJX and recommended substitutes (SN74ACT573DWR, SN74ACT573NSR) carry MSL 1 rating, requiring no special moisture handling during storage or assembly.

Q: Can I use MC74ACT573DWR2G instead of 74ACT573SJX?

A: No. The MC74ACT573DWR2G has a 1:8 circuit configuration, while the 74ACT573SJX has an 8:8 configuration. This functional difference makes it unsuitable as a direct substitute, despite sharing the same logic type and output characteristics.