MM74HC373N D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The MM74HC373N is a D-Type Transparent Latch integrated circuit manufactured by onsemi, featuring an 8:8 channel configuration with tri-state output capability. This logic component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply voltage range and is housed in a 20-pin DIP package suitable for through-hole mounting applications.

Substiute Parts

MM74HC373N

onsemiIn Stock: 1914MM74HC373N Datasheet

Current PartRFQ

SN74HC373N

Texas InstrumentsIn Stock: 3577SN74HC373N Datasheet

DirectRFQ

CD74HC373E

Harris CorporationIn Stock: 1338CD74HC373E Datasheet

UpgradeRFQ

TC74HC373APF

Toshiba Semiconductor and StorageIn Stock: 21347TC74HC373APF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC373N is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Voltage - Supply: 2V ~ 6V
• Independent Circuits: 1
• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

All identified substitute parts maintain identical values across these critical parameters. Variations in propagation delay time, operating temperature range, product status, and compliance certifications do not preclude functional substitution when electrical performance requirements are met.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74HC373N (Texas Instruments)

The SN74HC373N is the preferred substitute for the MM74HC373N. This part maintains active product status, ensuring long-term availability and supply chain stability. The SN74HC373N carries ROHS3 compliance certification, meeting current environmental and regulatory standards. Propagation delay of 15ns is faster than the original specification, providing improved timing performance without compromising functional compatibility.

Secondary Recommendation: TC74HC373APF (Toshiba Semiconductor and Storage)

The TC74HC373APF serves as an alternative substitute with active product status and RoHS compliance. This part offers the fastest propagation delay at 12ns among all available options, suitable for applications requiring enhanced timing performance. Inventory availability is significantly higher at 21,318 pieces, supporting high-volume procurement requirements.

Tertiary Option: CD74HC373E (Harris Corporation)

The CD74HC373E is functionally compatible but carries obsolete product status classification. This part features an extended operating temperature range of -55°C to 125°C, applicable to industrial or harsh environment applications. However, RoHS non-compliance status may restrict use in regulated markets or applications with environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC373N directly replace the MM74HC373N without circuit modifications?

A: Yes. Both parts share identical logic type, circuit configuration, output type, supply voltage range, and package specifications. Direct pin-for-pin substitution is supported without circuit redesign.

Q: What is the significance of the propagation delay differences between substitute parts?

A: Propagation delay variations (12ns to 30ns) reflect manufacturing differences between suppliers. Selection depends on timing-critical circuit requirements. Faster propagation delays (SN74HC373N at 15ns, TC74HC373APF at 12ns) provide margin for timing-sensitive applications. The CD74HC373E at 30ns remains within acceptable parameters for non-critical timing paths.

Q: Does RoHS compliance affect functional compatibility?

A: RoHS compliance status does not affect electrical or functional performance. It reflects manufacturing process and material composition standards. RoHS-compliant parts (SN74HC373N, TC74HC373APF) are recommended for new designs and regulated applications. RoHS non-compliant parts (CD74HC373E) may face procurement restrictions in certain markets.

Q: Are all substitute parts available in the same 20-DIP package?

A: Yes. All substitute parts are housed in 20-DIP (0.300", 7.62mm) packages with through-hole mounting, ensuring mechanical and board-level compatibility with the original MM74HC373N design.

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

A: The SN74HC373N (Texas Instruments) and TC74HC373APF (Toshiba) both carry active product status, ensuring ongoing manufacturing and supply chain support. The TC74HC373APF demonstrates higher current inventory levels at 21,318 pieces.

Q: Can the CD74HC373E be used in applications requiring extended temperature operation?

A: Yes. The CD74HC373E supports an operating temperature range of -55°C to 125°C, compared to -40°C to 85°C for other options. This extended range is suitable for industrial, automotive, or harsh environment applications. However, obsolete product status and RoHS non-compliance should be evaluated against project requirements.