MM74HC74AN Equivalent & Substitute Parts

Part Overview

The MM74HC74AN 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 MM74HC74AN is classified as obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

MM74HC74AN

onsemiIn Stock: 5425MM74HC74AN Datasheet

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CD74HC74E

Harris CorporationIn Stock: 1470CD74HC74E Datasheet

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SN74AC74N

Texas InstrumentsIn Stock: 1342SN74AC74N Datasheet

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SN74HC74N

Texas InstrumentsIn Stock: 13841SN74HC74N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74HC74AN are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Criteria:

• Identical logic function: Dual D-type flip-flop with Set/Preset and Reset capability
• Identical output configuration: Complementary outputs
• Identical trigger mechanism: Positive edge-triggered
• Identical package form factor: 14-DIP (0.300", 7.62mm)
• Identical mounting type: Through Hole
• Compatible supply voltage range: 2V ~ 6V
• Compatible operating temperature range: minimum -40°C, maximum 85°C or wider

Substitute Parts Identified:

1. SN74HC74N (Texas Instruments) – Direct series equivalent with active product status
2. CD74HC74E (Harris Corporation) – Same series with extended temperature range
3. SN74AC74N (Texas Instruments) – Advanced CMOS variant with enhanced performance characteristics

All three substitute parts maintain the identical 14-DIP package, through-hole mounting, and core D-type flip-flop functionality required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

SN74HC74N (Texas Instruments) – Recommended Primary Substitute

The SN74HC74N is the optimal substitute for the MM74HC74AN. Both components belong to the 74HC series with identical electrical specifications, package form factor, and operating parameters. The SN74HC74N maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. This part is functionally interchangeable with no design modifications required.

SN74AC74N (Texas Instruments) – Performance-Enhanced Alternative

The SN74AC74N represents an advanced CMOS variant offering superior performance characteristics. It provides faster propagation delay (10ns versus 19ns), higher clock frequency capability (160 MHz versus 94 MHz), and lower quiescent current (2 µA versus 4 µA). The SN74AC74N maintains active product status and ROHS3 compliance. This substitute is suitable for applications requiring enhanced speed performance while maintaining the same 14-DIP package footprint. Pin-level compatibility is maintained.

CD74HC74E (Harris Corporation) – Extended Temperature Range Alternative

The CD74HC74E offers an extended operating temperature range (-55°C to 125°C) compared to the MM74HC74AN (-40°C to 85°C). This substitute is appropriate for applications requiring operation in extreme temperature environments. However, the CD74HC74E is classified as obsolete and RoHS non-compliant, making it less suitable for new designs or applications with regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC74N directly replace the MM74HC74AN without PCB modifications?

A: Yes. Both components share identical 14-DIP package dimensions, pin configuration, and electrical specifications within the 74HC series. Direct pin-for-pin substitution is supported without PCB layout changes.

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

A: The 74AC series (represented by SN74AC74N) provides enhanced performance with faster propagation delays, higher maximum clock frequencies, and greater output drive current. The 74HC series maintains lower power consumption. Both series are functionally compatible at the logic level but differ in speed and current characteristics.

Q: Is the SN74AC74N a drop-in replacement for the MM74HC74AN?

A: Yes, the SN74AC74N is pin-compatible and functionally equivalent. However, the increased output drive current (24mA versus 5.2mA) and faster propagation delay may affect circuit timing in applications with tight timing constraints. Verification of circuit behavior is recommended for timing-critical applications.

Q: Why is the MM74HC74AN listed as obsolete?

A: The MM74HC74AN is an older onsemi product. Active alternatives from major manufacturers such as Texas Instruments (SN74HC74N, SN74AC74N) provide equivalent or superior functionality with ongoing production and support.

Q: Does the CD74HC74E extended temperature range make it suitable for all applications?

A: The CD74HC74E is suitable only for applications requiring operation beyond the standard -40°C to 85°C range. For standard industrial and commercial applications, the SN74HC74N is the preferred substitute due to its active product status and RoHS3 compliance.

Q: Are all substitute parts available in the same packaging options?

A: All qualified substitute parts are available in 14-DIP through-hole packaging. Packaging variants (tube, reel) may differ by supplier and manufacturer, but the physical package form factor remains identical across all substitutes.

Q: What compliance certifications should I verify for new designs?

A: For new designs, prioritize parts with ROHS3 compliance and active product status. The SN74HC74N and SN74AC74N both meet these requirements. The CD74HC74E, while functionally equivalent, carries RoHS non-compliance status and should be avoided in applications subject to regulatory compliance mandates.