74F74SJ Equivalent & Substitute Parts

Part Overview

The 74F74SJ 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 74F74SJ is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

74F74SJ

onsemiIn Stock: 336874F74SJ Datasheet

Current PartRFQ

SN74F74NSR

Texas InstrumentsIn Stock: 4077SN74F74NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F74SJ is determined by strict equivalence across the following critical parameters:

• Functional architecture: Dual D-type flip-flop with complementary outputs and set/reset capability
• Trigger mechanism: Positive edge triggering
• Package form factor: 14-SOIC (0.209", 5.30mm Width) surface mount
• Electrical specifications: Supply voltage range 4.5V ~ 5.5V, output drive capability (1 mA high, 20 mA low)
• Base product series: 74F logic family

The SN74F74NSR from Texas Instruments meets all substitution criteria. Both parts share identical functional specifications, package geometry, and electrical operating parameters within the 74F series standard.

Parameter Comparison

Engineering Selection Recommendations

The SN74F74NSR is a direct functional substitute for the 74F74SJ. Both components are REACH Unaffected and classified under ECCN EAR99. The SN74F74NSR carries Active product status and RoHS3 compliance, providing superior long-term availability and regulatory alignment compared to the obsolete 74F74SJ.

The SN74F74NSR exhibits slightly higher maximum propagation delay (8 ns versus 6.8 ns) and clock frequency rating (145 MHz versus 125 MHz), both within acceptable margins for 74F series logic applications. Electrical drive characteristics, supply voltage requirements, and thermal operating ranges are identical.

Frequently Asked Questions (FAQ)

Q: Can the SN74F74NSR directly replace the 74F74SJ in existing designs?

A: Yes. Both parts are pin-compatible 14-SOIC packages with identical functional specifications, electrical characteristics, and output drive capabilities. No circuit modifications are required.

Q: What is the difference in propagation delay between these parts?

A: The 74F74SJ specifies 6.8 ns maximum propagation delay at 5V with 50pF load, while the SN74F74NSR specifies 8 ns under identical conditions. This 1.2 ns difference is within standard 74F series tolerance and does not affect functional compatibility in typical applications.

Q: Are there packaging differences between the 74F74SJ and SN74F74NSR?

A: Both parts use the 14-SOIC (0.209", 5.30mm Width) surface mount package. The 74F74SJ is supplied in standard packaging, while the SN74F74NSR is available in Tape & Reel format. PCB footprints and reflow profiles are identical.

Q: What is the product status difference, and does it affect substitution?

A: The 74F74SJ is classified as Obsolete, while the SN74F74NSR is Active. The Active status of the SN74F74NSR ensures continued manufacturing support, documented availability, and regulatory compliance updates.

Q: Are both parts RoHS compliant?

A: The SN74F74NSR is RoHS3 Compliant. The 74F74SJ status is not specified in the provided data. Both parts are REACH Unaffected.