MM74C373WM Equivalent & Substitute Parts

Part Overview

The MM74C373WM 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-SOIC surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a wide supply voltage range of 3V to 15V with a propagation delay of 70ns and supports independent circuit operation with 24mA output current capability.

Substiute Parts

MM74C373WM

onsemiIn Stock: 764MM74C373WM Datasheet

Current PartRFQ

MM74HC373WM

Fairchild SemiconductorIn Stock: 1608MM74HC373WM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74C373WM is determined by strict equivalence in the following critical parameters:

• Logic Function: D-Type Transparent Latch with identical 8:8 circuit configuration and tri-state output
• Package Compatibility: 20-SOIC surface mount package with matching 0.295" (7.50mm) width
• Electrical Interface: Pin-for-pin compatibility with functional equivalence
• Supply Voltage Range: The substitute must operate within overlapping or compatible voltage specifications
• Output Characteristics: Tri-state output capability with compatible current ratings

The MM74HC373WM qualifies as a direct substitute based on these criteria. Both parts share the same base product number (74C373 vs 74HC373), identical package format, and equivalent functional architecture. The 74HC series represents an active-production alternative to the obsolete 74C series, maintaining functional compatibility while offering improved performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The MM74HC373WM serves as the primary substitute for the obsolete MM74C373WM. Both components maintain identical functional architecture and package specifications, enabling direct replacement in 20-SOIC surface mount applications.

Voltage Compatibility Consideration: The MM74C373WM operates across 3V to 15V, while the MM74HC373WM operates across 2V to 6V. Design implementations operating within the 2V to 6V overlap range support direct substitution without circuit modification. Designs requiring operation above 6V supply voltage cannot use the MM74HC373WM substitute.

Performance Characteristics: The MM74HC373WM provides superior propagation delay performance (19ns versus 70ns) and reduced output current requirements (7.8mA versus 24mA), resulting in lower power consumption and faster signal transitions.

Temperature Range: The MM74C373WM supports extended temperature operation (-55°C to 125°C) compared to the MM74HC373WM (-40°C to 85°C). Applications requiring operation below -40°C or above 85°C must retain the original MM74C373WM specification.

Product Status: The MM74HC373WM maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete MM74C373WM.

Frequently Asked Questions (FAQ)

Q: Can the MM74HC373WM directly replace the MM74C373WM in all applications?

A: Direct replacement is possible only when the design operates within the 2V to 6V supply voltage range and the -40°C to 85°C temperature range. Designs exceeding these boundaries require the original MM74C373WM or alternative solutions.

Q: What are the key differences between the 74C and 74HC series?

A: The 74C series operates across a wider supply voltage range (3V to 15V) with higher output current capability (24mA). The 74HC series operates at lower voltages (2V to 6V) with reduced output current (7.8mA) but provides faster propagation delay (19ns versus 70ns) and lower power consumption.

Q: Are the packages identical between MM74C373WM and MM74HC373WM?

A: Yes. Both components use the 20-SOIC surface mount package with identical 0.295" (7.50mm) width, enabling direct PCB footprint compatibility.

Q: What compliance certifications apply to these parts?

A: Both the MM74C373WM and MM74HC373WM carry EAR99 ECCN classification and HTSUS code 8542.39.0001. The MM74C373WM is REACH Unaffected with MSL 1 (Unlimited). Compliance verification for the MM74HC373WM should be confirmed with the supplier.

Q: How does the propagation delay difference affect circuit performance?

A: The MM74HC373WM provides 19ns propagation delay compared to 70ns for the MM74C373WM. This faster response time may improve overall system timing performance but does not create incompatibility in applications designed for the slower MM74C373WM specification.