74ACTQ573MTCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ573MTCX 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-TSSOP surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across supply voltage, output characteristics, and timing specifications while accommodating available packaging and product status options.

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
Output Current (High/Low)	24mA / 24mA
Propagation Delay	6.5ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	20-TSSOP
Independent Circuits	1

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Logic Type: D-Type Transparent Latch
Output Type: Tri-State
Supply Voltage: 4.5V ~ 5.5V
Output Current: 24mA / 24mA
Operating Temperature: -40°C ~ 85°C
Independent Circuits: 1

Secondary Considerations:

Circuit Configuration (8:8 preferred for direct pin compatibility)
Propagation Delay (6ns to 10.5ns acceptable range)
Package Type (20-TSSOP or 20-SSOP with equivalent pitch)
Product Status (Active status preferred for long-term availability)

Substitute parts are grouped by their adherence to these parameters. Parts maintaining identical circuit configuration and package type provide direct functional replacement. Parts with alternative circuit configurations or package variants require design verification for mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Circuit	Propagation Delay (ns)	Package	Product Status	Packaging Type
74ACTQ573MTCX	onsemi	8:8	6.5	20-TSSOP	Obsolete	Tube
SN74ACT573PWR	Texas Instruments	8:8	6	20-TSSOP	Active	Cut Tape & Digi-Reel
SN74ACT563PWR	Texas Instruments	8:8	6.5	20-TSSOP	Active	Tape & Reel
SN74ACT573DBR	Texas Instruments	8:8	6	20-SSOP	Active	Tape & Reel
SN74ACT573PW	Texas Instruments	8:8	6	20-TSSOP	Discontinued at DiGi Electronics	Tube
MC74ACT573DTR2G	onsemi	1:8	10.5	20-TSSOP	Active	Tape & Reel

Engineering Selection Recommendations

Recommended Primary Substitutes:

SN74ACT573PWR and SN74ACT563PWR are the preferred alternatives. Both maintain identical electrical specifications to the 74ACTQ573MTCX, including 8:8 circuit configuration, 20-TSSOP package, and propagation delay within 0.5ns variance. Both parts carry Active product status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and regulatory compliance.

Secondary Substitutes:

SN74ACT573DBR provides electrical equivalence with identical 8:8 configuration and 6ns propagation delay. The package variant (20-SSOP vs. 20-TSSOP) requires PCB footprint verification due to different body width (5.30mm vs. 4.40mm), though pin pitch remains compatible.

SN74ACT573PW offers direct package and circuit compatibility but carries Discontinued at DiGi Electronics status, limiting future procurement viability.

Alternative Configuration:

MC74ACT573DTR2G maintains onsemi manufacturer continuity and 20-TSSOP package compatibility. The 1:8 circuit configuration and 10.5ns propagation delay represent functional differences requiring design-level evaluation for timing-critical applications.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT573PWR directly replace 74ACTQ573MTCX without PCB modification?

A: Yes. SN74ACT573PWR maintains identical pin count, package footprint (20-TSSOP), circuit configuration (8:8), and electrical specifications. No PCB layout changes are required.

Q: What is the difference between 20-TSSOP and 20-SSOP packages?

A: Both packages contain 20 pins with identical pitch. The primary difference is body width: 20-TSSOP measures 4.40mm width while 20-SSOP measures 5.30mm width. PCB footprints are not interchangeable without layout modification.

Q: Why is MC74ACT573DTR2G listed as a substitute if the circuit configuration differs?

A: MC74ACT573DTR2G is a parametric equivalent offering the same logic type, output type, supply voltage, and output current specifications. The 1:8 circuit configuration (versus 8:8) represents a functional difference that may be acceptable depending on application requirements. Design verification is necessary.

Q: Which substitute offers the best long-term availability?

A: SN74ACT573PWR and SN74ACT563PWR both carry Active product status from Texas Instruments, indicating ongoing production and supply continuity. Both include ROHS3 compliance certification.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status. The original 74ACTQ573MTCX does not specify RoHS status due to its obsolete classification.

Q: What packaging options are available for the recommended substitutes?

A: SN74ACT573PWR is supplied in Cut Tape and Digi-Reel format. SN74ACT563PWR is supplied in Tape & Reel format. Both are available in quantities supporting production requirements.

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