MM74HC174N Equivalent & Substitute Parts

Part Overview

The MM74HC174N is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 6 bits per element in a 16-DIP package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring this functionality.

Substiute Parts

MM74HC174N

onsemiIn Stock: 1894MM74HC174N Datasheet

Current PartRFQ

SN74HC174N

Texas InstrumentsIn Stock: 2756SN74HC174N Datasheet

DirectRFQ

CD74HC174E

Harris CorporationIn Stock: 1744CD74HC174E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC174N is determined by the following critical parameters:

• Functional equivalence: D-type flip-flop with 1 element, 6 bits per element, positive edge trigger, non-inverted output, and master reset function
• Electrical compatibility: Supply voltage range 2V ~ 6V, operating temperature range, output current specifications (5.2mA high and low)
• Package compatibility: 16-DIP (0.300", 7.62mm) through-hole mounting
• Series alignment: 74HC logic family

Both identified substitutes—SN74HC174N (Texas Instruments) and CD74HC174E (Harris Corporation)—meet these core substitution criteria. All three parts share identical functional specifications, package geometry, and electrical operating ranges.

Parameter Comparison

Engineering Selection Recommendations

SN74HC174N (Texas Instruments) is the primary substitute for new designs and ongoing production. This part is currently active in the product lifecycle, ensuring long-term availability and supply chain stability. It demonstrates superior performance with a 50 MHz clock frequency and 27ns propagation delay, while maintaining full electrical and functional compatibility with the MM74HC174N. RoHS3 compliance status provides regulatory alignment for modern manufacturing environments.

CD74HC174E (Harris Corporation) serves as an alternative substitute where supply constraints exist. While functionally equivalent and mechanically compatible, this part carries obsolete status similar to the original MM74HC174N. The extended operating temperature range (-55°C ~ 125°C) may provide advantages in extreme temperature applications, though this exceeds the original specification. RoHS non-compliance should be evaluated against project requirements.

Selection between substitutes should prioritize product lifecycle status, supply availability, and regulatory compliance requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can SN74HC174N directly replace MM74HC174N without circuit modifications?

A: Yes. Both parts are functionally and electrically equivalent within the 74HC logic family. They share identical pin configurations, package geometry (16-DIP), supply voltage range (2V ~ 6V), and output specifications. Direct socket substitution is valid.

Q: What is the significance of the different clock frequencies (31 MHz, 50 MHz, 35 MHz)?

A: Clock frequency represents the maximum operating speed. The SN74HC174N operates at 50 MHz, exceeding the MM74HC174N specification of 31 MHz. This provides design margin and is not a compatibility concern. Applications designed for 31 MHz will function correctly with the higher-rated substitute.

Q: Why is product status (Active vs. Obsolete) important for substitution?

A: Active products have guaranteed long-term availability and supply chain support. Obsolete products may face discontinuation or limited stock. For new designs, selecting an active substitute (SN74HC174N) ensures sustainable component sourcing.

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

A: No. All three parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging with matching pin assignments. Physical and electrical compatibility is confirmed.

Q: Does the CD74HC174E extended temperature range (-55°C ~ 125°C) affect compatibility?

A: No. Extended temperature range is a superset of the original specification (-40°C ~ 85°C). The CD74HC174E will function correctly in applications designed for the narrower range. Extended range capability does not create incompatibility.

Q: What compliance certifications should I verify for my application?

A: Verify RoHS compliance status against your manufacturing or regulatory requirements. SN74HC174N is RoHS3 compliant. CD74HC174E is RoHS non-compliant. Both parts are REACH unaffected and carry EAR99 ECCN classification.