MM74C74M Equivalent & Substitute Parts

Part Overview

The MM74C74M is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-SOIC surface mount package. This device features complementary outputs, positive edge triggering, and set/reset functionality. The MM74C74M is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

MM74C74M

onsemiIn Stock: 872MM74C74M Datasheet

Current PartRFQ

SN74HC74DR

Texas InstrumentsIn Stock: 3409SN74HC74DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74C74M is determined by the following critical parameters:

• Functional equivalence: Dual D-type flip-flop with complementary outputs, positive edge triggering, and set/reset capability
• Package compatibility: 14-SOIC surface mount package with identical pinout and mechanical dimensions
• Logic family compatibility: The 74HC series maintains functional pin compatibility with the 74C series
• Output characteristics: Complementary output configuration
• Trigger mechanism: Positive edge triggering

The SN74HC74DR from Texas Instruments satisfies these substitution criteria. While the 74HC series operates at different electrical specifications (lower supply voltage range, higher clock frequency, reduced propagation delay), the functional logic behavior and pinout remain compatible for direct replacement in applications where the 74HC electrical characteristics are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC74DR is an active product from Texas Instruments and represents the primary substitute for the obsolete MM74C74M. Both devices share identical pinout, package dimensions, and core logic functionality. The SN74HC74DR is RoHS3 compliant, providing regulatory advantage over the obsolete onsemi part.

Selection of the SN74HC74DR requires verification that the application tolerates the reduced supply voltage range (2V ~ 6V versus 3V ~ 15V) and narrower operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C). Applications operating at supply voltages above 6V or below 2V, or requiring extended temperature operation below -40°C or above 85°C, cannot use the SN74HC74DR as a direct substitute.

The improved electrical performance of the SN74HC74DR (higher clock frequency, lower propagation delay, reduced quiescent current) provides benefits in power consumption and timing margin for most applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC74DR replace the MM74C74M in all applications?

A: The SN74HC74DR is functionally equivalent in logic operation and pinout. However, applications must operate within the SN74HC74DR supply voltage range of 2V ~ 6V and temperature range of -40°C ~ 85°C. If your application requires operation outside these ranges, the SN74HC74DR is not suitable.

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

A: The 74C series operates across a wider supply voltage range (3V ~ 15V) and extended temperature range (-55°C ~ 125°C). The 74HC series operates at lower supply voltages (2V ~ 6V) with faster propagation delay and lower quiescent current. Both series maintain identical pinout and logic functionality for D-type flip-flops.

Q: Are the packages physically identical?

A: Yes. Both the MM74C74M and SN74HC74DR use the 14-SOIC (0.154", 3.90mm Width) surface mount package with identical pin assignments and mechanical dimensions, enabling direct PCB replacement.

Q: What is the significance of the obsolete status of the MM74C74M?

A: Obsolete status indicates that onsemi has discontinued production and support. The SN74HC74DR, as an active product, ensures ongoing availability, technical support, and compliance with current regulatory standards.

Q: Does the SN74HC74DR meet RoHS requirements?

A: Yes. The SN74HC74DR is RoHS3 compliant, meeting current environmental and material restriction standards.