74ACT74SJX Equivalent & Substitute Parts

Part Overview

The 74ACT74SJX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, designed for digital logic applications requiring edge-triggered storage elements. This device features complementary outputs, positive edge triggering, and operates across the standard 4.5V to 5.5V supply voltage range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

74ACT74SJX

onsemiIn Stock: 78274ACT74SJX Datasheet

Current PartRFQ

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 of the 74ACT74SJX is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

• Type: D-Type Flip Flop with dual elements
• Number of Elements: 2
• Number of Bits per Element: 1
• Output Type: Complementary
• Trigger Type: Positive Edge
• Voltage Supply Range: 4.5V ~ 5.5V
• Operating Temperature Range: -40°C ~ 85°C minimum
• Package Type: 14-SOIC

Performance Parameters (Allowable Variation):

• Clock Frequency: 85 MHz minimum
• Max Propagation Delay: 11 ns maximum at 5V, 50pF
• Current Output: 24 mA minimum (High and Low)
• Quiescent Current: No upper limit specified
• Input Capacitance: No upper limit specified

Substitute parts must maintain all mandatory equivalence parameters. Performance parameters may vary within the specified ranges, provided the substitute meets or exceeds the minimum performance thresholds of the original part.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT74NSR (Texas Instruments) - Recommended Direct Substitute

The SN74ACT74NSR is the optimal substitute for the 74ACT74SJX. This part maintains identical electrical specifications including clock frequency (210 MHz), propagation delay (11 ns @ 5V, 50pF), and output current ratings. The device is currently in active production status, ensuring long-term availability and supply chain stability. The SN74ACT74NSR carries ROHS3 compliance certification and is available in standard cut tape and digi-reel packaging formats. The 14-SOIC package dimensions match the original part (0.209", 5.30mm width), enabling direct PCB-level substitution without layout modifications.

74ACT11074D (Texas Instruments) - Performance-Enhanced Alternative

The 74ACT11074D provides superior performance characteristics with reduced propagation delay (8.5 ns versus 11 ns) and maintains the 210 MHz clock frequency specification. This part is actively produced and ROHS3 compliant. The package dimensions differ slightly (0.154", 3.90mm width versus 0.209", 5.30mm width), requiring PCB layout verification before implementation. This substitute is suitable for applications where improved timing performance is beneficial and PCB redesign is feasible.

CD74ACT74QM96G4Q1 (Texas Instruments) - Extended Temperature Alternative

The CD74ACT74QM96G4Q1 extends the operating temperature range to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. This part is classified as obsolete but remains available in inventory. The reduced clock frequency (85 MHz) and increased propagation delay (9.5 ns) remain within acceptable parameters for most applications. The package dimensions match the 74ACT11074D (0.154", 3.90mm width). This substitute is appropriate for automotive or extended-temperature applications where the original part's temperature range is insufficient.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT74NSR be used as a direct replacement for the 74ACT74SJX without PCB modifications?

A: Yes. The SN74ACT74NSR maintains identical electrical specifications and package dimensions (14-SOIC, 0.209", 5.30mm width). No PCB layout changes are required for direct substitution.

Q: What is the primary difference between the 74ACT11074D and the 74ACT74SJX?

A: The 74ACT11074D offers improved propagation delay performance (8.5 ns versus 11 ns) but uses a different package width (0.154", 3.90mm versus 0.209", 5.30mm). PCB layout verification is necessary before implementation.

Q: Is the CD74ACT74QM96G4Q1 suitable for standard industrial applications?

A: The CD74ACT74QM96G4Q1 is functionally equivalent for standard applications but is classified as obsolete. The SN74ACT74NSR is the recommended choice for new designs and ongoing production due to its active status and superior supply chain availability.

Q: Do all substitute parts maintain the same output current specifications?

A: Yes. All substitute parts specified maintain identical output current ratings of 24 mA for both high and low states, ensuring compatibility with existing load requirements.

Q: What compliance certifications should be verified for new designs?

A: The SN74ACT74NSR and 74ACT11074D both carry ROHS3 compliance certification. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification. Verify specific compliance requirements for your application before final part selection.

Q: Can the CD74ACT74QM96G4Q1 be used in applications requiring the full 210 MHz clock frequency?

A: The CD74ACT74QM96G4Q1 is rated for 85 MHz maximum clock frequency, which is lower than the original 210 MHz specification. Use this part only in applications where the reduced clock frequency meets system requirements.