MM74HCT74N Equivalent & Substitute Parts

Part Overview

The MM74HCT74N is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-DIP package. This component functions as a Set/Preset and Reset element with complementary outputs, designed for digital logic applications requiring edge-triggered flip-flop functionality. The MM74HCT74N is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence while meeting the same electrical and mechanical specifications.

Substiute Parts

MM74HCT74N

onsemiIn Stock: 2144MM74HCT74N Datasheet

Current PartRFQ

SN74HCT74N

Texas InstrumentsIn Stock: 5983SN74HCT74N Datasheet

DirectRFQ

CD74HCT74E

Texas InstrumentsIn Stock: 1973CD74HCT74E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74HCT74N are qualified based on the following criteria:

Functional Equivalence: All substitute parts must be dual D-type flip-flops with complementary outputs, positive edge triggering, and Set/Preset and Reset functions.

Package Compatibility: All parts must use 14-DIP (0.300", 7.62mm) through-hole packaging to ensure direct board-level compatibility.

Electrical Parameters: Supply voltage range (4.5V ~ 5.5V) and operating temperature range must be met or exceeded by substitute parts.

Series Compatibility: All parts belong to the 74HCT logic series, ensuring TTL/CMOS compatibility and standardized pin configurations.

The MM74HCT74N has two qualified substitutes: SN74HCT74N (direct manufacturer equivalent from Texas Instruments) and CD74HCT74E (functional equivalent with extended operating temperature range).

Parameter Comparison

Engineering Selection Recommendations

SN74HCT74N (Texas Instruments) is the primary direct substitute for the MM74HCT74N. Both parts share identical functional specifications, package configuration, and operating temperature range. The SN74HCT74N offers improved performance characteristics with higher clock frequency (46 MHz vs. 27 MHz) and faster propagation delay (25ns vs. 35ns). The SN74HCT74N is currently in active production status with ROHS3 compliance, making it suitable for new designs and production environments requiring modern component certifications.

CD74HCT74E (Texas Instruments) serves as a functional equivalent with extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C). This part is appropriate for applications requiring operation beyond standard industrial temperature limits. The CD74HCT74E maintains identical package configuration and core functionality while offering ROHS3 compliance and active product status. Clock frequency and propagation delay specifications are comparable to the original MM74HCT74N.

Both substitute parts are manufactured by Texas Instruments, a primary supplier of 74HCT series logic components, and maintain full electrical and mechanical compatibility with the MM74HCT74N in 14-DIP through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT74N and CD74HCT74E be used interchangeably with MM74HCT74N?

A: Both parts are functionally equivalent and pin-compatible with the MM74HCT74N. Selection depends on application requirements. Use SN74HCT74N for standard industrial applications (-40°C ~ 85°C). Use CD74HCT74E for extended temperature range applications (-55°C ~ 125°C).

Q: What are the key differences between SN74HCT74N and CD74HCT74E?

A: The primary difference is operating temperature range. CD74HCT74E supports -55°C ~ 125°C, while SN74HCT74N supports -40°C ~ 85°C. Input capacitance differs (3 pF vs. 10 pF). Both maintain identical package, voltage supply, and core flip-flop functionality.

Q: Are all substitute parts available in 14-DIP through-hole packaging?

A: Yes. Both SN74HCT74N and CD74HCT74E are supplied in 14-DIP (0.300", 7.62mm) through-hole packages, ensuring direct board-level compatibility with MM74HCT74N designs.

Q: Do substitute parts meet modern compliance requirements?

A: Yes. Both SN74HCT74N and CD74HCT74E are ROHS3 compliant and carry active product status from Texas Instruments, meeting current manufacturing and environmental compliance standards.

Q: What is the impact of different propagation delay specifications?

A: SN74HCT74N offers faster propagation delay (25ns @ 5.5V) compared to MM74HCT74N (35ns @ 5V). This represents improved performance and does not create compatibility issues in applications designed for the original part. CD74HCT74E maintains 35ns propagation delay, matching the original specification.

Q: Can these parts be soldered directly into existing MM74HCT74N board positions?

A: Yes. All substitute parts use identical 14-DIP through-hole pin configuration and spacing, allowing direct replacement without board redesign or rework.