74ACQ573SCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACQ573SCX 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.

The 74ACQ573SCX operates across a supply voltage range of 2V to 6V with a propagation delay of 5.5ns and output current capability of 24mA for both high and low states. The device is designed for surface mount applications and carries MSL Level 1 (unlimited moisture sensitivity).

Substiute Parts

74ACQ573SCX

onsemiIn Stock: 235474ACQ573SCX Datasheet

Current PartRFQ

MC74AC573DWG

onsemiIn Stock: 3269MC74AC573DWG Datasheet

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MC74AC573DWR2G

onsemiIn Stock: 1952MC74AC573DWR2G Datasheet

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CD74AC573M

Texas InstrumentsIn Stock: 1643CD74AC573M Datasheet

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CD74AC573M96

Texas InstrumentsIn Stock: 9662CD74AC573M96 Datasheet

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SN74AC573DW

Texas InstrumentsIn Stock: 3219SN74AC573DW 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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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACQ573SCX is determined by strict equivalence across the following critical parameters:

Core Functional 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:

• Supply Voltage Range: Must encompass or match 2V ~ 6V
• Output Current: Must support 24mA minimum for both high and low states
• Operating Temperature: Must support -40°C ~ 85°C minimum range

Acceptable Variations:

• Propagation Delay: Faster delays are acceptable (lower values indicate improved performance)
• Packaging Format: Tube, Tape & Reel (TR), or Cut Tape (CT) formats are interchangeable for the same electrical package
• Product Status: Active or Last Time Buy parts are preferred over obsolete classifications
• RoHS Compliance: ROHS3 Compliant status is preferred for environmental and regulatory alignment

Substitute parts meeting these criteria maintain functional and electrical compatibility with the 74ACQ573SCX while offering improved availability and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MC74AC573DWG and MC74AC573DWR2G from onsemi maintain identical electrical specifications to the 74ACQ573SCX within the same manufacturer ecosystem. Both parts are Active status with ROHS3 compliance, offering direct functional replacement with improved product lifecycle support. The 10ns propagation delay represents acceptable performance degradation for most applications requiring the original 5.5ns specification.

Secondary Substitutes (Texas Instruments):

SN74AC573DWR and CD74AC573M96 provide superior electrical performance with faster propagation delays (2.5ns and 3ns respectively) and extended operating temperature ranges. SN74AC573DWR maintains identical supply voltage specifications (2V ~ 6V) and is currently Active status. CD74AC573M96 offers the widest operating temperature range (-55°C ~ 125°C) and lowest propagation delay (3ns), with supply voltage range of 1.5V ~ 5.5V, suitable for applications requiring enhanced thermal performance.

Alternative Consideration:

SN74AC573NSR is Active status with superior propagation delay (2.5ns) but features a narrower package width (0.209" versus 0.295"), requiring PCB layout verification before substitution.

Avoid:

SN74AC573DW and SN74AC573DWG4 are listed as Discontinued at DiGi Electronics, limiting long-term procurement viability despite meeting electrical requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute MC74AC573DWG for the 74ACQ573SCX without circuit modifications?

A: Yes. MC74AC573DWG maintains identical logic type, circuit configuration, output type, supply voltage range, output current capability, operating temperature range, and package specifications. The 10ns propagation delay is slower than the original 5.5ns but remains within acceptable tolerance for most D-Type Transparent Latch applications. Verify timing-critical paths in your specific circuit design.

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 format, while MC74AC573DWR2G is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly process requirements.

Q: Why does CD74AC573M96 have a different supply voltage range (1.5V ~ 5.5V) compared to the 74ACQ573SCX (2V ~ 6V)?

A: CD74AC573M96 operates across a narrower but lower voltage range. It is compatible with 2V ~ 5.5V applications but cannot operate at 5.5V ~ 6V. Verify your circuit's supply voltage specification before selecting this substitute.

Q: Is SN74AC573NSR a direct replacement for the 74ACQ573SCX?

A: SN74AC573NSR is electrically compatible but features a different package width (0.209" versus 0.295"). While the pin configuration and electrical specifications match, the physical dimensions require PCB layout verification. Consult your PCB design files and component footprint library before substitution.

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 future procurement is not guaranteed. For new designs or long-term production, select Active status parts such as CD74AC573M96, MC74AC573DWG, or SN74AC573DWR.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry ROHS3 Compliant status, meeting environmental and regulatory requirements equivalent to or exceeding the original 74ACQ573SCX specification.