MC74ACT74D Equivalent & Substitute Parts

Part Overview

The MC74ACT74D is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This component functions as a Set(Preset) and Reset flip-flop with complementary outputs, designed for digital logic applications requiring edge-triggered storage elements. The MC74ACT74D is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

MC74ACT74D

onsemiIn Stock: 2142MC74ACT74D Datasheet

Current PartRFQ

MC74ACT74DG

onsemiIn Stock: 2049MC74ACT74DG Datasheet

DirectRFQ

CD74ACT74M96

Texas InstrumentsIn Stock: 1786CD74ACT74M96 Datasheet

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CD74ACT74QM96G4Q1

Texas InstrumentsIn Stock: 3300CD74ACT74QM96G4Q1 Datasheet

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SN74ACT74D

Texas InstrumentsIn Stock: 3013SN74ACT74D Datasheet

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SN74ACT74DR

Texas InstrumentsIn Stock: 2228SN74ACT74DR Datasheet

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SN74ACT74MDREP

Texas InstrumentsIn Stock: 2064SN74ACT74MDREP Datasheet

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SN74ACT74NSR

Texas InstrumentsIn Stock: 3874SN74ACT74NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MC74ACT74D are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Parameters:

• Logic family: 74ACT series
• Function: Dual D-type flip-flop with Set(Preset) and Reset
• Output type: Complementary
• Trigger type: Positive Edge
• Voltage supply range: 4.5V to 5.5V
• Package type: 14-SOIC surface mount

Acceptable Variations:

• Clock frequency: 85 MHz to 210 MHz (higher frequency parts are backward compatible)
• Propagation delay: 7.5 ns to 11 ns (faster parts are backward compatible)
• Quiescent current: 2 µA to 4 µA (lower current parts are backward compatible)
• Input capacitance: 3 pF to 10 pF (variations acceptable within logic family)
• Operating temperature range: -40°C to 85°C minimum; extended ranges (-55°C to 125°C) are acceptable
• Product status: Active or Obsolete parts are functionally equivalent
• RoHS compliance: Both compliant and non-compliant parts are electrically equivalent

Package Considerations:

• Primary package: 14-SOIC (0.154", 3.90mm Width) - direct mechanical substitute
• Alternative package: 14-SOIC (0.209", 5.30mm Width) - same pinout, different body width; requires PCB layout verification

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC74ACT74DG

MC74ACT74DG is the direct equivalent substitute for MC74ACT74D. Both parts share identical electrical specifications, clock frequency (210 MHz), propagation delay (11 ns), and operating temperature range (-40°C to 85°C). MC74ACT74DG differs only in product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant). This part provides the most seamless replacement with no design modifications required.

Secondary Recommendations: SN74ACT74DR and SN74ACT74D

SN74ACT74DR (Active status) and SN74ACT74D (Discontinued at DiGi Electronics) are Texas Instruments equivalents with superior electrical performance. Both feature faster propagation delay (7.5 ns vs. 11 ns) and lower quiescent current (2 µA vs. 4 µA), making them functionally superior substitutes. These parts are backward compatible with the MC74ACT74D in all applications. SN74ACT74DR is currently active and recommended for new designs.

Alternative Recommendation: SN74ACT74MDREP

SN74ACT74MDREP offers extended operating temperature range (-55°C to 125°C) compared to the MC74ACT74D (-40°C to 85°C). This part is suitable for applications requiring wider temperature operation. Electrical specifications match the MC74ACT74D (210 MHz clock frequency, 11 ns propagation delay).

Package Consideration: SN74ACT74NSR

SN74ACT74NSR is electrically equivalent but uses a wider 14-SOIC package (0.209", 5.30mm Width) compared to the standard 14-SOIC (0.154", 3.90mm Width). This part requires PCB layout verification before substitution due to different body dimensions.

Not Recommended for Direct Substitution: CD74ACT74M96 and CD74ACT74QM96G4Q1

CD74ACT74M96 and CD74ACT74QM96G4Q1 feature reduced clock frequency (85 MHz vs. 210 MHz) and are not recommended as direct substitutes for timing-critical applications. CD74ACT74QM96G4Q1 includes automotive qualification (AEC-Q100) and extended temperature range, suitable only for automotive applications requiring these certifications.

Frequently Asked Questions (FAQ)

Q: Can I use MC74ACT74DG as a direct replacement for MC74ACT74D?

A: Yes. MC74ACT74DG is a direct electrical equivalent with identical specifications for clock frequency, propagation delay, voltage supply range, output current, and operating temperature. The only differences are product status (Active vs. Obsolete) and RoHS compliance. No design modifications are required.

Q: What is the difference between the 14-SOIC (0.154", 3.90mm) and 14-SOIC (0.209", 5.30mm) packages?

A: Both packages have identical pinouts and electrical characteristics but differ in body width. The 0.154" width is the standard narrow SOIC package, while the 0.209" width is a wider variant. PCB footprints are not interchangeable without layout modification. Verify your PCB design before substituting SN74ACT74NSR (0.209" width) for the standard 0.154" width parts.

Q: Are Texas Instruments SN74ACT74 parts compatible with the onsemi MC74ACT74D?

A: Yes. All SN74ACT74 variants (SN74ACT74D, SN74ACT74DR, SN74ACT74MDREP, SN74ACT74NSR) are functionally compatible with MC74ACT74D. They share the same 74ACT logic family, dual D-type flip-flop function, complementary outputs, and positive edge trigger. Some variants offer improved performance (faster propagation delay, lower quiescent current) or extended temperature ranges.

Q: What does "Obsolete" product status mean for the MC74ACT74D?

A: Obsolete status indicates the manufacturer has discontinued production. The MC74ACT74D is no longer available from onsemi. Active equivalent parts such as MC74ACT74DG (onsemi) or SN74ACT74DR (Texas Instruments) should be used for new designs and ongoing procurement.

Q: Can I substitute a part with lower quiescent current (2 µA) for the original 4 µA specification?

A: Yes. Lower quiescent current is a beneficial characteristic. Parts with 2 µA quiescent current (SN74ACT74D, SN74ACT74DR, SN74ACT74MDREP, SN74ACT74NSR) consume less power than the original 4 µA specification and are fully compatible substitutes.

Q: Is RoHS compliance required for my application?

A: RoHS compliance depends on your application and regional requirements. MC74ACT74D is RoHS non-compliant, while all substitute parts listed (MC74ACT74DG, CD74ACT74M96, CD74ACT74QM96G4Q1, SN74ACT74D, SN74ACT74DR, SN74ACT74MDREP, SN74ACT74NSR) are ROHS3 Compliant. If RoHS compliance is mandatory, select from the compliant alternatives.

Q: Why do some parts have faster propagation delays (7.5 ns vs. 11 ns)?

A: Propagation delay variation reflects manufacturing process differences between manufacturers and product lines. Faster propagation delay (7.5 ns) is a performance improvement and does not affect compatibility. Parts with faster delays are backward compatible with designs specified for 11 ns delays.

Q: Can I use CD74ACT74M96 with its 85 MHz clock frequency instead of 210 MHz?

A: CD74ACT74M96 is electrically compatible but operates at reduced maximum clock frequency (85 MHz vs. 210 MHz). Use this part only if your application clock frequency does not exceed 85 MHz. For applications requiring 210 MHz operation, select parts with 210 MHz specification (MC74ACT74DG, SN74ACT74D, SN74ACT74DR, SN74ACT74MDREP, SN74ACT74NSR).

Q: What is the difference between Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) packaging?

A: Both are reel-based packaging formats for automated assembly. Cut Tape (CT) & Digi-Reel allows individual piece selection, while Tape & Reel (TR) is continuous reel format. Both formats contain the same component in identical packages. Selection depends on your assembly process requirements and order quantities.