N74F74D Equivalent & Substitute Parts

Part Overview

The N74F74D is a dual D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The N74F74D provides two independent D-type flip-flops with complementary outputs, set/preset and reset functions, and positive edge triggering suitable for digital logic applications requiring state storage and synchronization.

Substiute Parts

N74F74D,623

Nexperia USA Inc.In Stock: 1090N74F74D,623 Datasheet

Current PartRFQ

SN74F74D

Texas InstrumentsIn Stock: 5804SN74F74D Datasheet

DirectRFQ

SN74F74DR

Texas InstrumentsIn Stock: 8068SN74F74DR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the N74F74D are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Compatibility Criteria:

• Series: 74F (same logic family)
• Type: D-Type Flip-Flop (identical function)
• Number of Elements: 2 (same configuration)
• Number of Bits per Element: 1 (same bit width)
• Output Type: Complementary (same output configuration)
• Trigger Type: Positive Edge (same triggering mechanism)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
• Operating Temperature: 0°C ~ 70°C (same operating range)

Mechanical Compatibility Criteria:

• Package / Case: 14-SOIC (0.154", 3.90mm Width) (identical footprint)
• Mounting Type: Surface Mount (same mounting method)

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute parts SN74F74D and SN74F74DR meet all electrical and mechanical compatibility requirements. Performance variations in clock frequency and propagation delay represent improvements over the original part and do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

SN74F74DR (Texas Instruments) - Recommended Primary Substitute

The SN74F74DR is the preferred substitute for the obsolete N74F74D. This part carries Active product status, ensuring long-term availability and supply chain stability. It meets all electrical and mechanical compatibility requirements with identical pin configuration, voltage supply range, and operating temperature specifications. The improved clock frequency (145 MHz vs. 125 MHz) and reduced propagation delay (5.8 ns vs. 8 ns) provide performance enhancement without introducing compatibility issues. ROHS3 compliance and MSL 1 rating match the original part. Packaging in Cut Tape (CT) & Digi-Reel® format supports both prototype and production volume requirements.

SN74F74D (Texas Instruments) - Secondary Substitute

The SN74F74D serves as an alternative substitute with identical electrical and mechanical specifications to the SN74F74DR. This part carries Last Time Buy status, indicating limited future availability. Selection of this part should be reserved for applications where specific packaging requirements (Tube format) are mandated or where inventory constraints necessitate immediate procurement. All compliance certifications and performance characteristics align with the primary substitute.

Frequently Asked Questions (FAQ)

Q: Can the SN74F74D or SN74F74DR be used as direct replacements for the N74F74D without circuit modification?

A: Yes. Both Texas Instruments parts are direct pin-for-pin and functionally equivalent substitutes. The 14-SOIC package footprint is identical, and all electrical parameters fall within compatible ranges. No circuit modifications are required for substitution.

Q: What is the significance of the improved clock frequency and propagation delay in the substitute parts?

A: The SN74F74D and SN74F74DR operate at 145 MHz with 5.8 ns propagation delay compared to the N74F74D at 125 MHz with 8 ns delay. These improvements represent enhanced performance specifications that do not compromise backward compatibility. Circuits designed for the original part will function correctly with the substitute parts.

Q: Why is the SN74F74DR recommended over the SN74F74D?

A: The SN74F74DR carries Active product status, ensuring continued manufacturing and availability. The SN74F74D is designated Last Time Buy, indicating that production will cease and future procurement may become difficult. For new designs and long-term applications, the SN74F74DR provides supply chain security.

Q: Are there any differences in packaging between the substitute parts?

A: Yes. The SN74F74D is supplied in Tube packaging, while the SN74F74DR is supplied in Cut Tape (CT) & Digi-Reel® format. Both use the identical 14-SOIC (0.154", 3.90mm Width) surface mount package. Packaging selection depends on production volume and assembly process requirements.

Q: Do the substitute parts maintain the same compliance certifications as the original N74F74D?

A: Yes. Both SN74F74D and SN74F74DR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance profile. REACH status is unaffected for all three parts.

Q: What is the base product number for these parts?

A: The base product number for all three parts is 74F74, indicating they belong to the same logic family and functional category. Suffix designations (D, DR) indicate manufacturer and packaging variations.