MM74HCT74MX Equivalent & Substitute Parts

Part Overview

The MM74HCT74MX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This device functions as a Set/Preset and Reset element with complementary outputs, operating at a maximum clock frequency of 27 MHz with a propagation delay of 35ns at 5V and 50pF load. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the MM74HCT74MX becomes unavailable due to supply constraints, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications are needed for specific application requirements while maintaining functional and electrical compatibility within the 74HCT74 logic family.

Key Parameters

Parameter	MM74HCT74MX
Manufacturer	onsemi
Base Product Number	74HCT74
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Clock Frequency (Max)	27 MHz
Propagation Delay @ 5V, 50pF	35ns
Voltage Supply Range	4.5V ~ 5.5V
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT74MX is determined by strict adherence to the following electrical and mechanical parameters:

Core Compatibility Requirements:

Base product number must be 74HCT74
Package type must be 14-SOIC (0.154", 3.90mm Width)
Mounting type must be Surface Mount
Function must include Set/Preset and Reset
Output type must be Complementary
Number of elements must be 2
Number of bits per element must be 1
Voltage supply range must encompass 4.5V ~ 5.5V
Trigger type must be Positive Edge

Performance Parameters Affecting Substitution:

Clock frequency must be equal to or greater than 27 MHz
Propagation delay must be equal to or less than 35ns at specified voltage and load conditions
Current output specifications (High/Low) must meet or exceed 4.8mA
Quiescent current must not exceed 2 µA
Input capacitance must not exceed 5 pF

Compliance and Status Considerations:

Product status should be Active or equivalent production status
RoHS3 compliance is required for new designs
Moisture sensitivity level must be 1 (Unlimited)

Substitute parts are grouped by their ability to meet these parameters while potentially offering improved performance characteristics such as higher clock frequency, lower propagation delay, or extended operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Clock Freq (MHz)	Prop Delay (ns)	Output Current (mA)	Quiescent Current (µA)	Input Capacitance (pF)	Operating Temp (°C)	Product Status	RoHS Status	Packaging
MM74HCT74MX	onsemi	27	35 @ 5V	4.8 / 4.8	2	5	-40 ~ 85	Active	ROHS3	Tape & Reel
MC74HCT74ADG	onsemi	30	24 @ 5V	4 / 4	2	10	-55 ~ 125	Active	ROHS3	Tube
MC74HCT74ADR2G	onsemi	30	24 @ 5V	4 / 4	2	10	-55 ~ 125	Active	ROHS3	Tape & Reel
74HCT74D,653	NXP Semiconductors	59	44 @ 4.5V	4 / 4	40	4.6	-40 ~ 125	Active	Not specified	Not specified
74HCT74D-Q100,118	Nexperia USA Inc.	59	44 @ 4.5V	4 / 4	40	4.6	-40 ~ 125	Active	ROHS3	Tape & Reel
CD74HCT74M	Texas Instruments	50	35 @ 4.5V	4 / 4	4	10	-55 ~ 125	Discontinued	ROHS3	Tube
CD74HCT74M96	Harris Corporation	50	35 @ 4.5V	4 / 4	4	10	-55 ~ 125	Obsolete	Non-compliant	Not specified
CD74HCT74MT	Texas Instruments	50	35 @ 4.5V	4 / 4	4	10	-55 ~ 125	Discontinued	ROHS3	Cut Tape
SN74HCT74D	Texas Instruments	46	18 @ 5.5V	4 / 4	4	3	-40 ~ 85	Discontinued	ROHS3	Not specified
SN74HCT74DR	Texas Instruments	46	18 @ 5.5V	4 / 4	4	3	-40 ~ 85	Active	ROHS3	Cut Tape & Digi-Reel
SN74HCT74DT	Texas Instruments	46	25 @ 5.5V	4 / 4	4	3	-40 ~ 85	Discontinued	ROHS3	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

MC74HCT74ADR2G and MC74HCT74ADG from onsemi are direct functional equivalents with improved performance specifications. Both parts exceed the minimum clock frequency requirement at 30 MHz and deliver superior propagation delay performance at 24ns. The ADR2G variant is packaged in Tape & Reel format matching the original MM74HCT74MX packaging preference. Both parts maintain ROHS3 compliance and support extended operating temperature range from -55°C to 125°C.

SN74HCT74DR from Texas Instruments is an active production part with ROHS3 compliance. This device demonstrates the fastest propagation delay at 18ns at 5.5V and operates within the specified temperature range of -40°C to 85°C. The part is available in Cut Tape and Digi-Reel packaging formats.

Secondary Substitutes (Performance Considerations):

74HCT74D-Q100,118 from Nexperia USA Inc. is an automotive-qualified part (AEC-Q100) with active production status and ROHS3 compliance. This part offers the highest clock frequency at 59 MHz and is suitable for applications requiring automotive-grade reliability. Packaging is provided in Tape & Reel format.

Not Recommended for New Designs:

CD74HCT74M96 from Harris Corporation carries obsolete status and RoHS non-compliance, making it unsuitable for new product development. CD74HCT74M and CD74HCT74MT from Texas Instruments are discontinued at DiGi Electronics and should not be selected for new designs despite ROHS3 compliance. SN74HCT74D and SN74HCT74DT are discontinued at DiGi Electronics and should be avoided for new applications.

Frequently Asked Questions (FAQ)

Q: Can MC74HCT74ADR2G directly replace MM74HCT74MX in existing designs?

A: Yes. MC74HCT74ADR2G meets all core compatibility requirements including package type (14-SOIC), mounting method (Surface Mount), functional characteristics (dual D-type flip-flop with complementary outputs), and voltage supply range (4.5V ~ 5.5V). The part exceeds performance specifications with 30 MHz clock frequency versus 27 MHz and 24ns propagation delay versus 35ns. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating.

Q: What is the difference between MC74HCT74ADG and MC74HCT74ADR2G?

A: Both parts are functionally and electrically identical with identical performance specifications. The primary difference is packaging format. MC74HCT74ADG is supplied in Tube packaging while MC74HCT74ADR2G is supplied in Tape & Reel format. Selection depends on manufacturing process requirements and handling equipment compatibility.

Q: Why do some substitute parts show higher quiescent current specifications?

A: The 74HCT74D,653 from NXP Semiconductors and 74HCT74D-Q100,118 from Nexperia USA Inc. both specify 40 µA quiescent current compared to 2 µA for the MM74HCT74MX. This represents a different manufacturing process or die revision within the 74HCT74 family. While this exceeds the original specification, it remains acceptable for most applications where quiescent current is not a critical design constraint. Verify application power budget requirements before selection.

Q: Is SN74HCT74DR suitable for high-speed applications?

A: Yes. SN74HCT74DR from Texas Instruments delivers the fastest propagation delay at 18ns at 5.5V, making it suitable for applications requiring minimal signal delay. The part maintains active production status with ROHS3 compliance and operates within the -40°C to 85°C temperature range. Clock frequency of 46 MHz exceeds the 27 MHz minimum requirement.

Q: Can automotive-qualified 74HCT74D-Q100,118 be used in non-automotive applications?

A: Yes. Automotive qualification (AEC-Q100) indicates enhanced reliability testing and quality assurance. Parts qualified to automotive standards are fully compatible with commercial and industrial applications. The 74HCT74D-Q100,118 meets all electrical and mechanical requirements for the MM74HCT74MX substitution criteria and is available in active production status with ROHS3 compliance.

Q: What packaging formats are available for substitute parts?

A: Substitute parts are available in Tape & Reel (TR), Tube, Cut Tape (CT), and Cut Tape with Digi-Reel formats. The MM74HCT74MX original part uses Tape & Reel packaging. MC74HCT74ADR2G and 74HCT74D-Q100,118 also use Tape & Reel format for direct manufacturing process compatibility. Tube and Cut Tape variants require different handling and placement equipment.

Q: Are there any compliance or certification differences between substitute parts?

A: Most active production substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). All parts share REACH Unaffected status and EAR99 export classification. The 74HCT74D-Q100,118 includes additional AEC-Q100 automotive qualification. CD74HCT74M96 is RoHS non-compliant and should not be used in new designs. Verify specific compliance requirements for your application before final part selection.

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