74ACTQ573SJ D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACTQ573SJ 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

74ACTQ573SJ

onsemiIn Stock: 89974ACTQ573SJ Datasheet

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MC74ACT573DWR2G

onsemiIn Stock: 2225MC74ACT573DWR2G Datasheet

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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

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ573SJ is determined by the following critical parameters:

• Logic Type: Must be D-Type Transparent Latch
• Circuit Configuration: Must be 8:8
• Output Type: Must be Tri-State
• Voltage - Supply: Must be 4.5V ~ 5.5V
• Current - Output High, Low: Must be 24mA, 24mA
• Mounting Type: Must be Surface Mount
• Package Compatibility: 20-SOIC or 20-SOP variants acceptable

Substitute parts are grouped into two categories based on package type and product status:

Group 1 - Active Status Parts (Preferred for New Designs)

• SN74ACT573DWR (Texas Instruments, 20-SOIC, Tape & Reel)
• SN74ACT573NSR (Texas Instruments, 20-SO, Tape & Reel)

Group 2 - Obsolete Status Parts (Legacy Support)

• CD74ACT573M (Harris Corporation, 20-SOIC, Tube)
• CD74ACT573M96 (Harris Corporation, 20-SOIC, Bulk)
• SN74ACT573DW (Texas Instruments, 20-SOIC, Tube)

Group 3 - Non-Compatible Substitute

• MC74ACT573DWR2G (onsemi, 1:8 circuit configuration - does not meet 8:8 requirement)

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Active Procurement:

SN74ACT573DWR and SN74ACT573NSR are the preferred substitutes. Both are manufactured by Texas Instruments with active product status, ROHS3 compliance, and unlimited moisture sensitivity rating. SN74ACT573DWR is supplied in Tape & Reel packaging suitable for automated assembly, while SN74ACT573NSR offers the same electrical characteristics in a narrower 20-SO package matching the original 74ACTQ573SJ footprint (0.209" width).

For Legacy System Support:

CD74ACT573M and CD74ACT573M96 provide functional equivalence with extended operating temperature range (-55°C ~ 125°C) and faster propagation delay (3.1ns). These parts are obsolete but remain available in inventory. Note that RoHS compliance is not achieved with these Harris Corporation variants.

SN74ACT573DW offers intermediate status between active and obsolete classifications, with ROHS3 compliance and standard operating temperature range.

Package Consideration:

The original 74ACTQ573SJ uses a narrower 20-SOP package (0.209" width). SN74ACT573NSR maintains this footprint. SN74ACT573DWR, CD74ACT573M, CD74ACT573M96, and SN74ACT573DW use the wider 20-SOIC package (0.295" width), requiring PCB layout verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT573DWR2G be used as a substitute for 74ACTQ573SJ?

A: No. MC74ACT573DWR2G has a 1:8 circuit configuration, while 74ACTQ573SJ requires 8:8 configuration. This fundamental difference in circuit topology makes it incompatible.

Q: What is the primary difference between SN74ACT573DWR and SN74ACT573NSR?

A: Both parts are electrically identical with 8:8 configuration, tri-state output, and identical propagation delay (6ns). The difference is package width: SN74ACT573DWR uses 20-SOIC (0.295" width), while SN74ACT573NSR uses 20-SO (0.209" width). SN74ACT573NSR matches the original 74ACTQ573SJ package footprint.

Q: Are the Harris Corporation parts (CD74ACT573M, CD74ACT573M96) suitable for new designs?

A: These parts are obsolete and not RoHS compliant. They are suitable only for legacy system maintenance where existing designs require exact functional replacement. For new designs, Texas Instruments active parts are recommended.

Q: What does the propagation delay difference mean for circuit performance?

A: The 74ACTQ573SJ has 6.5ns propagation delay. Substitutes range from 3.1ns (Harris parts) to 6ns (Texas Instruments parts). Faster propagation delay improves timing performance but does not create incompatibility. All values are within acceptable logic circuit tolerances for standard applications.

Q: Is moisture sensitivity a concern when substituting these parts?

A: The 74ACTQ573SJ and all recommended Texas Instruments substitutes have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Harris Corporation parts do not specify MSL rating. Standard handling procedures apply to all variants.

Q: Can I use SN74ACT573DW instead of SN74ACT573DWR?

A: Yes, electrically they are identical. SN74ACT573DW is supplied in Tube packaging while SN74ACT573DWR is supplied in Tape & Reel. The choice depends on assembly method: manual assembly typically uses Tube packaging, while automated assembly uses Tape & Reel.