MM74C74MX Equivalent & Substitute Parts

Part Overview

The MM74C74MX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in the 74C series. This device features two independent D-type flip-flops with set and reset functions, complementary outputs, and positive edge triggering. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MM74C74MX operates across a wide supply voltage range of 3V to 15V and is housed in a 14-SOIC surface mount package.

Substiute Parts

MM74C74MX

onsemiIn Stock: 969MM74C74MX Datasheet

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HEF4013BT,653

Nexperia USA Inc.In Stock: 1000178HEF4013BT,653 Datasheet

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SN74HC74DR

Texas InstrumentsIn Stock: 3409SN74HC74DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74C74MX are qualified based on the following core electrical and mechanical parameters:

Functional Equivalence: All substitute parts must be dual D-type flip-flops with complementary outputs, positive edge triggering, and set/reset functionality.

Package Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB compatibility without layout modifications.

Electrical Parameters: Substitute parts must support the required supply voltage range and maintain compatible propagation delay characteristics. The original part operates at 3V to 15V; substitutes must cover this range or be suitable for the specific voltage used in the application.

Output Characteristics: Current output ratings (high and low) and input capacitance must be within acceptable ranges for the application circuit.

Operating Temperature: Substitute parts must support the required temperature range for the application environment.

The two qualified substitute parts—HEF4013BT,653 (Nexperia) and SN74HC74DR (Texas Instruments)—meet all functional and package requirements while offering active product status and improved performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

HEF4013BT,653 (Nexperia): This substitute is suitable for applications requiring the full 3V to 15V supply voltage range of the original MM74C74MX. The HEF4013BT,653 maintains voltage compatibility while offering improved performance with 40 MHz clock frequency and reduced propagation delay (60ns). The part is ROHS3 compliant and carries active product status, ensuring long-term availability. Quiescent current is significantly reduced to 4 µA compared to the original 60 µA, providing power efficiency benefits. The operating temperature range extends to -40°C to 125°C, which covers most industrial applications, though it does not extend to the original -55°C minimum.

SN74HC74DR (Texas Instruments): This substitute is appropriate for applications operating within the 2V to 6V supply voltage range. The SN74HC74DR delivers superior performance with 60 MHz clock frequency and minimal propagation delay (15ns @ 6V), making it ideal for high-speed logic applications. The part is ROHS3 compliant with active product status. However, the supply voltage range is narrower than the original part, limiting its use to lower voltage systems. The operating temperature range is -40°C to 85°C, which is suitable for commercial and industrial environments but does not extend to the original -55°C minimum or the upper 125°C limit.

Selection Criteria: Choose HEF4013BT,653 for designs requiring the extended 3V to 15V supply voltage compatibility of the original MM74C74MX. Select SN74HC74DR for applications operating at 2V to 6V where high-speed performance and minimal propagation delay are critical requirements.

Frequently Asked Questions (FAQ)

Q: Can the HEF4013BT,653 directly replace the MM74C74MX in all applications?

A: The HEF4013BT,653 is functionally equivalent and uses the same 14-SOIC package, enabling direct PCB substitution. However, verify that your application operates within the -40°C to 125°C temperature range. If your design requires operation below -40°C, the HEF4013BT,653 is not suitable.

Q: What is the key difference between the HEF4013BT,653 and SN74HC74DR?

A: The primary difference is supply voltage range. The HEF4013BT,653 supports 3V to 15V (matching the original MM74C74MX), while the SN74HC74DR operates only at 2V to 6V. The SN74HC74DR offers superior speed performance with 60 MHz clock frequency and 15ns propagation delay compared to the HEF4013BT,653 at 40 MHz and 60ns.

Q: Is the SN74HC74DR compatible with the original MM74C74MX supply voltage range?

A: No. The SN74HC74DR maximum supply voltage is 6V, which is below the original part's 15V maximum. Use the SN74HC74DR only in applications designed for 2V to 6V operation.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the HEF4013BT,653 and SN74HC74DR are ROHS3 compliant, meeting environmental and regulatory requirements for modern electronics manufacturing.

Q: What is the package compatibility status?

A: All three parts—MM74C74MX, HEF4013BT,653, and SN74HC74DR—use the 14-SOIC (0.154", 3.90mm Width) surface mount package. No PCB layout modifications are required for substitution.

Q: Which substitute part has lower power consumption?

A: Both substitute parts have significantly lower quiescent current (4 µA) compared to the original MM74C74MX (60 µA), providing improved power efficiency in either case.

Q: Can I use the SN74HC74DR in a design originally specified for the MM74C74MX?

A: Only if your circuit operates within the 2V to 6V supply voltage range and the -40°C to 85°C temperature range. If your design requires the extended voltage or temperature specifications of the original part, use the HEF4013BT,653 instead.