74ACT74SJ Equivalent & Substitute Parts

Part Overview

The 74ACT74SJ is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, featuring complementary outputs and positive edge triggering. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The 74ACT series architecture remains consistent across multiple manufacturers, enabling direct functional substitution when electrical and mechanical parameters align.

Substiute Parts

74ACT74SJ

onsemiIn Stock: 573174ACT74SJ Datasheet

Current PartRFQ

74ACT11074NSR

Texas InstrumentsIn Stock: 117274ACT11074NSR Datasheet

DirectRFQ

SN74ACT74NSR

Texas InstrumentsIn Stock: 3874SN74ACT74NSR Datasheet

DirectRFQ

74ACT11074D

Texas InstrumentsIn Stock: 143774ACT11074D Datasheet

SimilarRFQ

CD74ACT74QM96G4Q1

Texas InstrumentsIn Stock: 3300CD74ACT74QM96G4Q1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT74SJ is determined by the following critical parameters:

• Logic Function: Dual D-type flip-flop with complementary outputs and positive edge triggering
• Package Compatibility: 14-SOIC form factor with matching pin configuration
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), output drive capability (24mA), and operating temperature range (-40°C ~ 85°C minimum)
• Timing Performance: Clock frequency and propagation delay specifications must meet or exceed application requirements

Substitute parts are categorized as follows:

Direct Substitutes maintain identical or superior electrical performance with compatible packaging and active product status.

Similar Substitutes provide functional equivalence with variations in package dimensions, clock frequency, or product lifecycle status that may require design consideration.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Package Dimensions):

SN74ACT74NSR is the primary direct substitute for 74ACT74SJ. This Texas Instruments part maintains the 14-SOIC (0.209", 5.30mm Width) package, matches the 210 MHz clock frequency and 11ns propagation delay specification, and carries active product status with ROHS3 compliance. The lower quiescent current (2 µA vs. 20 µA) and reduced input capacitance (3 pF vs. 4.5 pF) represent improved electrical characteristics suitable for power-sensitive applications.

74ACT11074NSR provides an alternative direct substitute with identical package dimensions and active status. This part operates at 125 MHz with 8.5ns propagation delay, representing faster switching performance. The reduced quiescent current (4 µA) and input capacitance (4.6 pF) offer efficiency improvements. Selection between SN74ACT74NSR and 74ACT11074NSR depends on clock frequency requirements within the application circuit.

For Package-Variant Substitution (Smaller Package Dimensions):

74ACT11074D and CD74ACT74QM96G4Q1 utilize the 14-SOIC (0.154", 3.90mm Width) package, representing a more compact form factor. These parts are functionally equivalent but require PCB layout modification to accommodate the reduced package width. 74ACT11074D maintains active product status with ROHS3 compliance. CD74ACT74QM96G4Q1 is automotive-grade (AEC-Q100 qualified) with extended operating temperature range (-40°C ~ 125°C), suitable for temperature-critical applications, though product status is obsolete.

Compliance Considerations:

All active substitute parts (74ACT11074NSR, SN74ACT74NSR, 74ACT11074D) are ROHS3 compliant, meeting environmental regulatory requirements. The main part (74ACT74SJ) and CD74ACT74QM96G4Q1 lack specified RoHS status documentation.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT74NSR directly replace 74ACT74SJ without PCB modification?

A: Yes. SN74ACT74NSR maintains identical package dimensions (14-SOIC, 0.209" width), pin configuration, and electrical specifications (supply voltage, output drive, operating temperature). No PCB layout changes are required. The part is pin-compatible and functionally equivalent.

Q: What is the difference between 74ACT11074NSR and SN74ACT74NSR?

A: Both are Texas Instruments parts with identical package dimensions and active status. The primary difference is clock frequency: 74ACT11074NSR operates at 125 MHz with 8.5ns propagation delay, while SN74ACT74NSR operates at 210 MHz with 11ns propagation delay. SN74ACT74NSR matches the original 74ACT74SJ clock frequency specification. Selection depends on application timing requirements.

Q: Why do 74ACT11074D and CD74ACT74QM96G4Q1 have different package dimensions?

A: These parts use the 14-SOIC (0.154", 3.90mm Width) package, which is a more compact variant than the original 14-SOIC (0.209", 5.30mm Width). The narrower package requires PCB footprint modification. Electrical functionality remains identical; only physical dimensions differ.

Q: Is CD74ACT74QM96G4Q1 suitable for automotive applications?

A: CD74ACT74QM96G4Q1 carries AEC-Q100 automotive qualification and extended operating temperature range (-40°C ~ 125°C). However, this part is classified as obsolete. For new automotive designs, 74ACT11074D or SN74ACT74NSR are recommended as active alternatives.

Q: What does "active" product status mean compared to "obsolete"?

A: Active parts are currently manufactured and supported by the supplier with guaranteed availability and technical support. Obsolete parts are no longer manufactured; existing inventory may be available through distributors, but long-term supply is not assured. For new designs, active parts are preferred.

Q: Are there quiescent current differences between substitute parts?

A: Yes. The original 74ACT74SJ specifies 20 µA quiescent current. All substitute parts operate at lower quiescent current: SN74ACT74NSR (2 µA), 74ACT11074NSR (4 µA), 74ACT11074D (4 µA), and CD74ACT74QM96G4Q1 (4 µA). This represents improved power efficiency in all substitutes.

Q: Can I use 74ACT11074D if my PCB layout accommodates the smaller package?

A: Yes. 74ACT11074D is functionally equivalent with active product status and ROHS3 compliance. The smaller package (0.154" width) requires PCB footprint modification but provides no electrical performance penalty. Verify that your PCB design rules and assembly equipment support the narrower package dimensions.