N74F74D Equivalent & Substitute Parts

Part Overview

The N74F74D is a dual D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., housed in a 14-SOIC surface mount package. This component functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The N74F74D is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional equivalence while offering improved availability and active product status from alternative manufacturers.

Substiute Parts

N74F74D,602

NXP USA Inc.In Stock: 762N74F74D,602 Datasheet

Current PartRFQ

SN74F74D

Texas InstrumentsIn Stock: 5804SN74F74D Datasheet

DirectRFQ

SN74F74DR

Texas InstrumentsIn Stock: 8068SN74F74DR Datasheet

DirectRFQ

SN74F74NSR

Texas InstrumentsIn Stock: 4077SN74F74NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the N74F74D is determined by strict equivalence across the following parameters:

• Functional Type: D-Type flip-flop with 2 elements, 1 bit per element, complementary outputs
• Logic Function: Set(Preset) and Reset capability with positive edge triggering
• Electrical Specifications: 4.5V ~ 5.5V supply voltage, 0°C ~ 70°C operating temperature range
• Package Compatibility: 14-SOIC surface mount package
• Compliance: ROHS3 compliant, MSL 1 rating

All substitute parts listed maintain these core parameters. Variations in clock frequency and propagation delay do not preclude substitution, as these represent performance enhancements rather than functional incompatibilities. Package width variations (0.154" vs 0.209") are noted but do not affect electrical substitution eligibility within the 14-SOIC family.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74F74DR (Texas Instruments)

The SN74F74DR is the preferred substitute for the obsolete N74F74D. This part maintains identical electrical specifications and package dimensions (14-SOIC, 0.154" width), ensuring direct pin-compatible replacement. The SN74F74DR carries Active product status, guaranteeing long-term availability and supply chain stability. ROHS3 compliance and MSL 1 rating match the original specification. The improved propagation delay (5.8ns vs 8ns) and higher clock frequency (145 MHz vs 125 MHz) provide performance enhancement without introducing compatibility concerns.

Secondary Substitute: SN74F74D (Texas Instruments)

The SN74F74D is functionally equivalent with identical package dimensions and electrical specifications. However, this part carries Last Time Buy status, indicating limited future availability. Selection of this part should be restricted to applications requiring immediate procurement where SN74F74DR availability is constrained.

Alternative Substitute: SN74F74NSR (Texas Instruments)

The SN74F74NSR is functionally equivalent but features a wider 14-SOIC package (0.209" vs 0.154"). This part is suitable for applications where PCB layout accommodates the increased package width. Active product status ensures availability. Propagation delay matches the original specification (8ns), making this part appropriate for timing-sensitive applications requiring exact delay characteristics.

Frequently Asked Questions (FAQ)

Q: Can the SN74F74DR directly replace the N74F74D without PCB modifications?

A: Yes. The SN74F74DR is pin-compatible and maintains identical package dimensions (14-SOIC, 0.154" width). No PCB layout changes are required for direct substitution.

Q: What is the difference between SN74F74D and SN74F74DR?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: SN74F74D is supplied in Tube packaging, while SN74F74DR is supplied in Cut Tape and Digi-Reel format. SN74F74DR carries Active product status compared to SN74F74D's Last Time Buy status.

Q: Is the SN74F74NSR compatible with the original N74F74D design?

A: The SN74F74NSR is functionally and electrically equivalent but features a wider package (0.209" vs 0.154"). Electrical compatibility is confirmed, but PCB footprint verification is required before implementation.

Q: Why does the SN74F74DR have faster propagation delay than the N74F74D?

A: The SN74F74DR specification lists 5.8ns maximum propagation delay compared to 8ns for the N74F74D. This represents improved performance from the Texas Instruments manufacturing process and does not affect functional compatibility. Designs specified for 8ns delay will operate correctly with the faster 5.8ns part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SN74F74D, SN74F74DR, SN74F74NSR) are ROHS3 compliant with MSL 1 rating, matching the original N74F74D specification.

Q: What is the recommended substitute for new designs?

A: The SN74F74DR is recommended for new designs. This part offers Active product status, ensuring long-term availability, combined with improved performance specifications and identical package compatibility with the original N74F74D.