MM74HCT573N D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The MM74HCT573N is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 channel configuration with tri-state output in a 20-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The part operates within a 4.5V to 5.5V supply voltage range and is suitable for through-hole mounting applications requiring transparent latch functionality.

Substiute Parts

MM74HCT573N

onsemiIn Stock: 861MM74HCT573N Datasheet

Current PartRFQ

CD74HCT573E

Harris CorporationIn Stock: 3066CD74HCT573E Datasheet

SimilarRFQ

SN74HCT573N

Texas InstrumentsIn Stock: 2486SN74HCT573N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT573N 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
• Supply Voltage Range: Must support 4.5V ~ 5.5V
• Package / Case: Must be 20-DIP (0.300", 7.62mm)
• Mounting Type: Must be Through Hole

All identified substitute parts meet these core electrical and mechanical requirements, ensuring functional compatibility within the specified operating parameters.

Parameter Comparison

Engineering Selection Recommendations

SN74HCT573N (Texas Instruments) is the primary substitute for new designs and production continuity. This part maintains active product status, ensuring long-term availability and supply chain stability. The SN74HCT573N is ROHS3 compliant, meeting current environmental and regulatory requirements. Propagation delay of 25ns and output current specifications of 6mA are within acceptable operating margins for applications designed around the MM74HCT573N.

CD74HCT573E (Harris Corporation) is an alternative substitute where supply constraints exist. This part offers an extended operating temperature range of -55°C to 125°C, suitable for applications requiring broader thermal performance. However, the CD74HCT573E is classified as RoHS non-compliant and obsolete, limiting its applicability to legacy system maintenance or specialized thermal requirements.

Selection between SN74HCT573N and CD74HCT573E should prioritize regulatory compliance, supply availability, and thermal operating requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT573N directly replace MM74HCT573N in existing designs?

A: Yes. Both parts share identical logic type, circuit configuration, output type, supply voltage range, and 20-DIP package. Propagation delay differences (25ns vs. 17ns) are within acceptable timing margins for most applications. Verify timing-critical paths in your specific design.

Q: What is the primary advantage of SN74HCT573N over CD74HCT573E?

A: SN74HCT573N maintains active product status and ROHS3 compliance, ensuring regulatory alignment and long-term supply availability. CD74HCT573E is obsolete and RoHS non-compliant, making it unsuitable for new designs or applications requiring environmental certifications.

Q: Are there package or mounting differences between these substitutes?

A: No. All three parts use identical 20-DIP (0.300", 7.62mm) through-hole packages, ensuring direct mechanical compatibility on existing PCB layouts without redesign.

Q: Does the propagation delay difference affect circuit performance?

A: Propagation delay varies across the three parts: MM74HCT573N (17ns), SN74HCT573N (25ns), and CD74HCT573E (35ns). For timing-critical applications, verify that the substitute's delay specification meets your system's setup and hold time requirements.

Q: Which substitute is recommended for new production?

A: SN74HCT573N is the recommended substitute for new production due to active status, ROHS3 compliance, and established supply chain availability through major distributors.