MM74HC14N Equivalent & Substitute Parts

Part Overview

The MM74HC14N is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in a 14-MDIP package. This logic component operates across a 2V to 6V supply voltage range and is designed for digital signal inversion applications requiring hysteresis input characteristics. The MM74HC14N is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Direct functional equivalents from active manufacturers provide continuity for applications currently using this component.

Substiute Parts

MM74HC14N

onsemiIn Stock: 35164MM74HC14N Datasheet

Current PartRFQ

CD74HC14E

Texas InstrumentsIn Stock: 16325CD74HC14E Datasheet

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SN74HC14N

Texas InstrumentsIn Stock: 4144SN74HC14N Datasheet

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TC74HC14APF

Toshiba Semiconductor and StorageIn Stock: 4576TC74HC14APF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HC14N is determined by strict equivalence across the following critical parameters:

• Logic Configuration: All substitute parts maintain 6-channel inverter topology with Schmitt trigger inputs
• Electrical Specifications: Supply voltage range (2V ~ 6V), input logic levels, and output current ratings remain consistent across all qualified substitutes
• Package Compatibility: All substitutes use 14-DIP through-hole packaging with identical 0.300" (7.62mm) pitch, ensuring direct PCB compatibility
• Functional Performance: Propagation delay specifications and quiescent current ratings fall within acceptable engineering tolerances

The three qualified substitutes (CD74HC14E, SN74HC14N, TC74HC14APF) meet these criteria and are sourced from active manufacturers, addressing the obsolete status of the original MM74HC14N.

Parameter Comparison

Engineering Selection Recommendations

CD74HC14E (Texas Instruments): This substitute maintains full electrical and thermal compatibility with the MM74HC14N, including the extended operating temperature range of -55°C to 125°C. The CD74HC14E carries ROHS3 compliance and active product status, making it suitable for applications requiring regulatory adherence and long-term availability. Propagation delay is 23ns at 6V with 50pF load, representing a 2ns increase from the original specification.

SN74HC14N (Texas Instruments): This part provides direct electrical equivalence with identical propagation delay (21ns) and quiescent current specifications. Operating temperature range is restricted to -40°C to 85°C, which is acceptable for commercial and industrial applications within this thermal envelope. ROHS3 compliance and active status support modern supply chain requirements.

TC74HC14APF (Toshiba Semiconductor and Storage): This substitute offers the lowest quiescent current specification at 1 µA maximum, providing potential power consumption advantages in battery-operated or low-power applications. Input logic level low threshold extends to 1.5V, which may require evaluation in noise-sensitive environments. Operating temperature range is -40°C to 85°C. ROHS3 compliance and active product status ensure regulatory and availability continuity.

Selection between these three substitutes depends on specific application requirements: extended temperature range applications favor CD74HC14E; cost-optimized designs with standard temperature requirements may use SN74HC14N; power-constrained applications benefit from TC74HC14APF's lower quiescent current.

Frequently Asked Questions (FAQ)

Q: Can MM74HC14N be directly replaced with any of these substitutes on existing PCBs?

A: Yes. All three substitutes use identical 14-DIP through-hole packaging with 0.300" (7.62mm) pitch, enabling direct socket replacement without PCB modification.

Q: What is the primary reason for substitution?

A: The MM74HC14N is classified as obsolete. The three active substitutes ensure continued availability and support for new production runs and design continuity.

Q: Are there differences in propagation delay between substitutes?

A: CD74HC14E specifies 23ns maximum propagation delay at 6V with 50pF load, while SN74HC14N and TC74HC14APF both specify 21ns. This 2ns difference is within typical logic circuit tolerances but should be evaluated for timing-critical applications.

Q: Which substitute is best for extended temperature applications?

A: CD74HC14E maintains the original -55°C to 125°C operating range. SN74HC14N and TC74HC14APF are limited to -40°C to 85°C, suitable for commercial and industrial environments.

Q: Do all substitutes meet modern regulatory requirements?

A: All three substitutes carry ROHS3 compliance and REACH Unaffected status. The original MM74HC14N does not specify RoHS status, making the substitutes preferable for applications requiring regulatory documentation.

Q: Is there a power consumption difference between substitutes?

A: TC74HC14APF specifies 1 µA maximum quiescent current, compared to 2 µA for the other substitutes. This 50% reduction may provide measurable benefits in ultra-low-power applications.

Q: Are input logic level thresholds identical across all parts?

A: TC74HC14APF specifies input logic level low threshold of 0.3V to 1.5V, while MM74HC14N, CD74HC14E, and SN74HC14N specify 0.3V to 1.2V. This difference is minor but should be considered in noise-sensitive or marginal signal applications.