74HC74N Equivalent & Substitute Parts

Part Overview

The 74HC74N is a dual D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., housed in a 14-DIP package. This component functions as a Set/Preset and Reset element with complementary outputs, designed for positive edge-triggered applications. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

74HC74N,652

NXP USA Inc.In Stock: 124774HC74N,652 Datasheet

Current PartRFQ

CD74HC74E

Harris CorporationIn Stock: 1470CD74HC74E Datasheet

DirectRFQ

SN74HC74AN

Texas InstrumentsIn Stock: 1115SN74HC74AN Datasheet

MFR RecommendedRFQ

SN74HC74N

Texas InstrumentsIn Stock: 13841SN74HC74N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC74N are qualified based on the following electrical and mechanical parameters:

• Package Compatibility: All substitutes must use 14-DIP (0.300", 7.62mm) through-hole mounting to ensure direct board-level replacement without layout modifications.
• Functional Equivalence: All substitutes must be dual D-type flip-flops with 2 elements, 1 bit per element, complementary outputs, and positive edge triggering.
• Voltage Supply Range: All substitutes must operate within 2V ~ 6V supply voltage range.
• Output Characteristics: All substitutes must provide 5.2 mA output current capability for both high and low states.
• Series Classification: All substitutes belong to the 74HC logic family, ensuring consistent electrical behavior and timing characteristics.

The following parts meet these substitution criteria:

1. CD74HC74E (Harris Corporation) - Direct functional equivalent with identical package and core electrical specifications.
2. SN74HC74N (Texas Instruments) - Active product status with full parameter compatibility and enhanced availability.
3. SN74HC74AN (Texas Instruments) - Alternative variant with active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74HC74N (Texas Instruments)

The SN74HC74N is the preferred substitute for the 74HC74N. This part maintains full electrical and mechanical compatibility while offering Active product status, ensuring long-term availability and supply chain stability. The SN74HC74N is ROHS3 compliant and provides equivalent propagation delay performance (30 ns) with lower quiescent current (4 µA versus 40 µA), resulting in improved power efficiency. The 14-PDIP package is directly compatible with the original 14-DIP footprint.

Secondary Recommendation: CD74HC74E (Harris Corporation)

The CD74HC74E provides direct functional equivalence with identical electrical specifications and package compatibility. However, this part carries Obsolete product status and RoHS non-compliance, limiting its suitability for new designs or applications requiring regulatory compliance. This option is suitable only for legacy system maintenance where RoHS compliance is not mandated.

Alternative Option: SN74HC74AN (Texas Instruments)

The SN74HC74AN is an active Texas Instruments product with ROHS3 compliance. Detailed electrical and package specifications are not fully provided in the available data; verification of complete parameter compatibility is required before selection for critical applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC74N directly replace the 74HC74N without PCB modifications?

A: Yes. Both parts use the 14-DIP (0.300", 7.62mm) through-hole package with identical pin configurations. Direct board-level substitution is possible without layout changes.

Q: What is the significance of the lower quiescent current in the SN74HC74N?

A: The SN74HC74N draws 4 µA quiescent current compared to 40 µA in the 74HC74N. This 10-fold reduction in standby current consumption results in lower power dissipation during idle states, beneficial for battery-powered or power-constrained applications.

Q: Why is the CD74HC74E not recommended as a primary substitute?

A: The CD74HC74E is classified as Obsolete and is RoHS non-compliant. While electrically equivalent, its obsolete status creates supply chain risk, and RoHS non-compliance may violate regulatory requirements in applications subject to environmental directives.

Q: Are there differences in propagation delay between the substitutes?

A: Yes. The 74HC74N specifies 37 ns maximum propagation delay at 6V with 50 pF load. The SN74HC74N and CD74HC74E both specify 30 ns under identical conditions, representing faster switching performance. For timing-critical applications, this difference must be evaluated against system requirements.

Q: What is the operating temperature range difference between substitutes?

A: The 74HC74N operates from -40°C to 125°C. The CD74HC74E extends the lower limit to -55°C, suitable for military or extreme cold-environment applications. The SN74HC74N operates from -40°C to 85°C, which is adequate for commercial and industrial temperature ranges but does not extend to the upper limit of the original part.

Q: Is the SN74HC74AN a suitable alternative to the SN74HC74N?

A: The SN74HC74AN is an active Texas Instruments product with ROHS3 compliance. However, complete electrical and package specifications are not fully documented in the available reference data. Detailed datasheet verification is required to confirm full compatibility before selection.