74F74SJX Equivalent & Substitute Parts

Part Overview

The 74F74SJX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-SOIC surface mount package. This component features complementary outputs, positive edge triggering, and set/reset functionality. The 74F74SJX is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

74F74SJX

onsemiIn Stock: 1629374F74SJX Datasheet

Current PartRFQ

SN74F74NSR

Texas InstrumentsIn Stock: 4077SN74F74NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F74SJX is determined by strict alignment of the following critical parameters:

• Functional Architecture: Dual D-type flip-flop with 1 bit per element and complementary outputs
• Trigger Mechanism: Positive edge triggering with set/preset and reset capability
• Electrical Specifications: Supply voltage range 4.5V–5.5V, operating temperature 0°C–70°C
• Package Compatibility: 14-SOIC (0.209", 5.30mm Width) surface mount configuration
• Logic Series: 74F family classification

The SN74F74NSR from Texas Instruments meets all substitution criteria. Both components share identical functional specifications, package geometry, and electrical operating parameters, enabling direct substitution in applications requiring the 74F74 logic function.

Parameter Comparison

Engineering Selection Recommendations

The SN74F74NSR is the qualified substitute for the 74F74SJX. Selection rationale is based on the following factors:

Product Status: The 74F74SJX is obsolete, while the SN74F74NSR maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: Both components share identical REACH status (REACH Unaffected), ECCN classification (EAR99), and HTSUS code (8542.39.0001). The SN74F74NSR carries RoHS3 compliance certification, meeting modern regulatory requirements.

Electrical & Functional Equivalence: All critical parameters—supply voltage, operating temperature, output drive capability, and logic function—are identical. The SN74F74NSR exhibits marginally higher clock frequency (145 MHz vs. 125 MHz) and slightly increased propagation delay (8 ns vs. 6.8 ns), both within acceptable tolerance for 74F logic family applications.

Package Compatibility: Identical 14-SOIC package geometry ensures direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the SN74F74NSR directly replace the 74F74SJX without circuit modification?

A: Yes. Both components are pin-compatible, functionally identical D-type flip-flops with complementary outputs in the same 14-SOIC package. No circuit changes are required.

Q: What is the significance of the higher clock frequency in the SN74F74NSR?

A: The SN74F74NSR operates at 145 MHz versus 125 MHz for the 74F74SJX. This represents improved performance headroom and does not restrict compatibility in applications designed for the 74F74 specification.

Q: Are there packaging differences between these parts?

A: Both components use 14-SOIC (0.209", 5.30mm Width) surface mount packaging. The 74F74SJX is supplied in standard packaging, while the SN74F74NSR is available in Tape & Reel format, which is standard for high-volume production environments.

Q: Why is product status relevant to substitution?

A: The 74F74SJX is obsolete, meaning onsemi no longer manufactures or supports this component. The SN74F74NSR maintains active production status, guaranteeing continued availability, technical support, and compliance with current manufacturing standards.

Q: Do both parts meet the same regulatory requirements?

A: Both components share identical REACH and ECCN classifications. The SN74F74NSR additionally carries RoHS3 compliance, which is required for many modern applications and markets.