74ACTQ74SCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ74SCX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-SOIC package. This component functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The part is currently obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring this logic function.

Substiute Parts

74ACTQ74SCX

onsemiIn Stock: 395674ACTQ74SCX Datasheet

Current PartRFQ

MC74ACT74DG

onsemiIn Stock: 2049MC74ACT74DG Datasheet

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MC74ACT74DR2G

onsemiIn Stock: 6226MC74ACT74DR2G Datasheet

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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

Substitution eligibility for the 74ACTQ74SCX is determined by the following critical parameters:

• Functional equivalence: D-type flip-flop with 2 elements, complementary outputs, set/preset and reset functions
• Trigger type: Positive edge triggering
• Package compatibility: 14-SOIC form factor (mechanical fit and pin assignment)
• Electrical specifications: Supply voltage range 4.5V ~ 5.5V, output current capability 24 mA minimum
• Timing performance: Propagation delay and clock frequency sufficient for application requirements
• Environmental rating: Operating temperature range and compliance certifications

Substitute parts are grouped into two categories based on product status and performance characteristics:

Category A - Active Status Parts: MC74ACT74DG, MC74ACT74DR2G, SN74ACT74DR, SN74ACT74MDREP, SN74ACT74NSR. These parts are currently in active production with RoHS3 compliance.

Category B - Obsolete/Discontinued Parts: CD74ACT74M96, CD74ACT74QM96G4Q1, SN74ACT74D. These parts share functional equivalence but have limited availability or discontinued status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended)

MC74ACT74DG and MC74ACT74DR2G are the preferred substitutes. Both are manufactured by onsemi, maintaining design continuity with the original 74ACTQ74SCX. These parts are in active production status with ROHS3 compliance and identical package dimensions (14-SOIC 0.154", 3.90mm). The MC74ACT74DR2G offers the additional advantage of tape and reel packaging for high-volume applications.

SN74ACT74DR (Texas Instruments) provides superior timing performance with 7.5 ns propagation delay and lower quiescent current (2 µA). This part is actively produced and ROHS3 compliant, making it suitable for applications where reduced power consumption is beneficial.

Secondary Substitutes (Conditional)

CD74ACT74M96 (Texas Instruments) is actively produced and ROHS3 compliant but exhibits lower clock frequency (85 MHz) and extended operating temperature range (-55°C ~ 125°C). This part is appropriate for applications requiring wider temperature operation.

SN74ACT74NSR differs mechanially with a wider 14-SOIC package (0.209", 5.30mm). This part is suitable only if PCB layout accommodates the larger package footprint.

Avoid

CD74ACT74QM96G4Q1 and SN74ACT74D are obsolete or discontinued at distributor level and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT74DG directly replace 74ACTQ74SCX without PCB modifications?

A: Yes. Both parts use identical 14-SOIC (0.154", 3.90mm) packaging with the same pin configuration. No PCB layout changes are required.

Q: What is the significance of the propagation delay difference between 74ACTQ74SCX (8 ns) and substitute parts?

A: The 74ACTQ74SCX specifies 8 ns maximum propagation delay. Substitute parts range from 7.5 ns to 11 ns. For applications with timing-critical requirements, SN74ACT74DR (7.5 ns) provides superior performance. Parts with 11 ns delays (MC74ACT74DG, MC74ACT74DR2G, SN74ACT74NSR) remain compatible with most standard logic applications but may require timing verification in high-speed circuits.

Q: Are all substitute parts RoHS3 compliant?

A: All active-status substitute parts (MC74ACT74DG, MC74ACT74DR2G, CD74ACT74M96, SN74ACT74DR, SN74ACT74MDREP, SN74ACT74NSR) are ROHS3 compliant. The original 74ACTQ74SCX RoHS status is not specified.

Q: What is the difference between MC74ACT74DG and MC74ACT74DR2G?

A: Both parts are functionally identical with matching electrical specifications. The primary difference is packaging format: MC74ACT74DG is supplied in tube packaging, while MC74ACT74DR2G is supplied in tape and reel format. Select based on your procurement and assembly process requirements.

Q: Can SN74ACT74NSR be used as a direct substitute?

A: SN74ACT74NSR is functionally equivalent but uses a wider 14-SOIC package (0.209", 5.30mm) compared to the standard 0.154" width. This part is compatible only if your PCB layout accommodates the larger package footprint. Verify physical clearance before selection.

Q: Which substitute offers the lowest power consumption?

A: SN74ACT74DR and SN74ACT74MDREP both specify 2 µA quiescent current, compared to 20 µA for the original 74ACTQ74SCX. These parts are optimal for battery-powered or low-power applications.

Q: Is CD74ACT74M96 suitable for automotive applications?

A: CD74ACT74M96 is not automotive-qualified. For automotive requirements, CD74ACT74QM96G4Q1 carries AEC-Q100 qualification, though this part is obsolete. Consult with your supplier for current automotive-grade alternatives.