MM74HC74ASJ Equivalent & Substitute Parts

Part Overview

The MM74HC74ASJ 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 flip-flop with complementary outputs, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional equivalence while meeting the same electrical and mechanical specifications required for direct board-level replacement.

Substiute Parts

MM74HC74ASJ

onsemiIn Stock: 1090MM74HC74ASJ Datasheet

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74HC74D,653

NXP SemiconductorsIn Stock: 100040474HC74D,653 Datasheet

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CD74HC74M

Texas InstrumentsIn Stock: 1274CD74HC74M Datasheet

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CD74HC74M96

Texas InstrumentsIn Stock: 1555CD74HC74M96 Datasheet

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CD74HC74MT

Texas InstrumentsIn Stock: 964CD74HC74MT Datasheet

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SN74HC74DG4

Texas InstrumentsIn Stock: 3229SN74HC74DG4 Datasheet

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SN74HC74DR

Texas InstrumentsIn Stock: 3409SN74HC74DR Datasheet

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SN74HC74DRG4

Texas InstrumentsIn Stock: 3392SN74HC74DRG4 Datasheet

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SN74HC74DT

Texas InstrumentsIn Stock: 2931SN74HC74DT Datasheet

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SN74HC74NSR

Texas InstrumentsIn Stock: 3409SN74HC74NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HC74ASJ is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Base product number: 74HC74 (ensures functional equivalence)
• Type: D-Type flip-flop with 2 elements, 1 bit per element
• Output type: Complementary
• Function: Set (Preset) and Reset capability
• Trigger type: Positive edge triggered
• Voltage supply range: 2V to 6V
• Output current capability: 5.2 mA high and low
• Quiescent current: 4 µA maximum
• Mounting type: Surface mount
• Moisture sensitivity: MSL 1 (Unlimited)

Package Compatibility: The MM74HC74ASJ uses 14-SOIC (0.209", 5.30mm Width) packaging. Substitute parts must use either the same 14-SOIC (0.209", 5.30mm Width) package or the narrower 14-SOIC (0.154", 3.90mm Width) variant, both of which are mechanically compatible with standard 14-pin SOIC footprints.

Performance Parameters: Clock frequency, propagation delay, and input capacitance may vary among substitutes within acceptable ranges for 74HC74 logic family devices. These variations do not prevent functional substitution provided all critical electrical parameters remain within specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74HC74NSR (Texas Instruments) is the preferred substitute. It maintains identical package dimensions (14-SOIC 0.209", 5.30mm Width) as the MM74HC74ASJ, eliminating any PCB footprint concerns. This part is currently active in production with ROHS3 compliance and meets all electrical specifications. Operating temperature range matches the original (-40°C to 85°C).

SN74HC74DR (Texas Instruments) provides superior propagation delay performance (15 ns versus 19 ns) while maintaining all other critical electrical parameters. This part uses the narrower 14-SOIC (0.154", 3.90mm Width) package, which is mechanically compatible with standard 14-pin SOIC footprints. Active product status and ROHS3 compliance ensure long-term availability.

Secondary Substitutes (Acceptable with Verification):

CD74HC74M96 (Texas Instruments) is an active product with ROHS3 compliance. Extended operating temperature range (-55°C to 125°C) provides additional margin. The narrower package variant (14-SOIC 0.154", 3.90mm Width) is compatible with standard footprints. Quiescent current and propagation delay specifications remain within acceptable ranges.

74HC74D,653 (NXP Semiconductors) is an active product suitable for applications where the higher quiescent current specification (40 µA versus 4 µA) is acceptable. Extended operating temperature range (-40°C to 125°C) may benefit certain applications. The narrower package variant requires standard 14-pin SOIC footprint compatibility.

Obsolete Alternatives (Not Recommended for New Designs):

CD74HC74M and SN74HC74DT are classified as obsolete or discontinued at DiGi Electronics. These parts should not be selected for new production designs due to uncertain long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC74DR as a direct replacement for MM74HC74ASJ?

A: Yes. SN74HC74DR is functionally equivalent and electrically compatible. Both are D-type flip-flops with identical logic function, output type, and electrical specifications. The primary difference is package width: SN74HC74DR uses the narrower 14-SOIC (0.154", 3.90mm) variant versus the MM74HC74ASJ's 14-SOIC (0.209", 5.30mm). Both packages are mechanically compatible with standard 14-pin SOIC PCB footprints. SN74HC74DR offers superior propagation delay performance (15 ns) and is currently in active production.

Q: What is the difference between the two 14-SOIC package variants?

A: The MM74HC74ASJ uses 14-SOIC (0.209", 5.30mm Width), while most substitute parts use 14-SOIC (0.154", 3.90mm Width). The difference refers to the body width of the package. Both variants have identical pin pitch and are compatible with standard 14-pin SOIC footprints. The narrower variant (3.90mm) is more commonly used in modern production and offers improved PCB space efficiency.

Q: Why does the 74HC74D,653 from NXP have higher quiescent current (40 µA)?

A: Quiescent current variation among 74HC74 logic family devices reflects different manufacturing processes and design approaches between manufacturers. The 40 µA specification for 74HC74D,653 remains within acceptable ranges for most applications. If quiescent current is critical to your design, select substitutes with 4 µA specifications such as SN74HC74DR or CD74HC74M96.

Q: Are all substitute parts ROHS3 compliant?

A: Texas Instruments substitutes (SN74HC74DR, CD74HC74M96, SN74HC74NSR) are explicitly ROHS3 compliant. The NXP 74HC74D,653 does not specify RoHS status in the provided data. For applications requiring RoHS3 compliance, select Texas Instruments alternatives.

Q: Can I use parts with extended temperature ranges (-55°C to 125°C) in place of the MM74HC74ASJ (-40°C to 85°C)?

A: Yes. Extended temperature range parts such as CD74HC74M96 (-55°C to 125°C) are fully compatible with applications requiring only -40°C to 85°C operation. The extended range provides additional design margin and is not a limitation for substitution.

Q: What is the significance of product status (Active, Obsolete, Discontinued)?

A: Product status indicates manufacturing and availability status. Active products are currently in production with assured long-term availability. Obsolete or discontinued parts may have limited stock and uncertain future availability. For new designs and production continuity, select active products such as SN74HC74DR, SN74HC74NSR, or CD74HC74M96.