MC74ACT573N Equivalent & Substitute Parts

Part Overview

The MC74ACT573N is a D-Type Transparent Latch logic IC manufactured by onsemi, housed in a 20-DIP package. This component functions as a single-channel 1:8 transparent latch with tri-state output capability, operating within the 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement continuity.

Substiute Parts

MC74ACT573N

onsemiIn Stock: 2998MC74ACT573N Datasheet

Current PartRFQ

CD74ACT573E

Harris CorporationIn Stock: 2214CD74ACT573E Datasheet

SimilarRFQ

SN74ACT573N

Texas InstrumentsIn Stock: 2082SN74ACT573N Datasheet

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SN74ACT573NE4

Texas InstrumentsIn Stock: 874SN74ACT573NE4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MC74ACT573N is determined by the following critical parameters:

Core Compatibility Requirements:

• Logic Type: D-Type Transparent Latch
• Output Type: Tri-State
• Voltage - Supply: 4.5V ~ 5.5V
• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Independent Circuits: 1
• Current - Output High, Low: 24mA, 24mA

Allowable Variations:

• Circuit Configuration: 1:8 or 8:8 (both configurations support the required functionality)
• Delay Time - Propagation: May vary (3.1ns to 10.5ns range acceptable)
• Operating Temperature: May extend beyond -40°C ~ 85°C
• Product Status: Active or Obsolete
• RoHS Compliance: May differ

All identified substitutes maintain identical electrical performance characteristics within the specified supply voltage and output current parameters, ensuring functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ACT573N (Texas Instruments)

The SN74ACT573N is the preferred substitute for new designs and ongoing procurement. This part maintains active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Electrical parameters are fully compatible with the MC74ACT573N, with identical supply voltage, output current, and operating temperature range specifications.

Secondary Option: CD74ACT573E (Harris Corporation)

The CD74ACT573E provides functional equivalence with extended operating temperature range (-55°C ~ 125°C), suitable for applications requiring broader thermal performance. This part is classified as obsolete, limiting its suitability for new procurement despite technical compatibility.

Tertiary Option: SN74ACT573NE4 (Texas Instruments)

The SN74ACT573NE4 offers ROHS3 compliance and identical electrical specifications to the primary recommendation. However, this variant is discontinued at DiGi Electronics, restricting availability for future orders.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT573N directly replace the MC74ACT573N in existing circuits?

A: Yes. Both parts share identical electrical specifications for supply voltage (4.5V ~ 5.5V), output current (24mA, 24mA), and operating temperature range (-40°C ~ 85°C). The 20-DIP package and through-hole mounting are identical, enabling direct pin-for-pin substitution.

Q: What is the significance of the circuit configuration difference (1:8 vs. 8:8)?

A: Both configurations support the same functional operation as D-Type Transparent Latches with tri-state outputs. The circuit designation reflects internal architecture but does not affect substitution compatibility for applications designed around the MC74ACT573N.

Q: Does RoHS compliance affect substitution eligibility?

A: RoHS compliance status does not determine functional substitution eligibility. However, for new designs and procurement, ROHS3-compliant parts such as SN74ACT573N are preferred to meet current regulatory and environmental standards.

Q: Are there differences in propagation delay between substitutes?

A: Propagation delays vary across substitutes (3.1ns to 10.5ns). For timing-critical applications, verify that the substitute's delay specification meets circuit requirements. The SN74ACT573N and SN74ACT573NE4 both specify 6ns propagation delay.

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

A: The SN74ACT573N (Texas Instruments) is the optimal choice for long-term availability, as it maintains active product status and ROHS3 compliance. Both the MC74ACT573N and CD74ACT573E are classified as obsolete.