74VHC74N Equivalent & Substitute Parts

Part Overview

The 74VHC74N is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-DIP 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 part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74VHC74N

onsemiIn Stock: 201974VHC74N Datasheet

Current PartRFQ

SN74AHC74N

Texas InstrumentsIn Stock: 5223SN74AHC74N Datasheet

DirectRFQ

CD74HC74E

Harris CorporationIn Stock: 1470CD74HC74E Datasheet

SimilarRFQ

SN74HC74N

Texas InstrumentsIn Stock: 13841SN74HC74N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74VHC74N is determined by the following critical parameters:

• Package compatibility: 14-DIP (0.300", 7.62mm) through-hole mounting
• Functional equivalence: Dual D-type flip-flop with set/preset and reset functions, complementary outputs, positive edge triggering
• Electrical performance: Clock frequency, propagation delay, supply voltage range, output current capability, and operating temperature range

Substitute parts are grouped into two categories:

Direct Substitutes maintain all critical electrical and functional parameters within acceptable tolerances for drop-in replacement.

Similar Substitutes share the same package and core functionality but may have different performance specifications, requiring design verification for specific applications.

Parameter Comparison

Engineering Selection Recommendations

SN74AHC74N (Texas Instruments) is the primary direct substitute. It maintains identical clock frequency (115 MHz), propagation delay (9.3ns @ 5V, 50pF), supply voltage range (2V ~ 5.5V), and output current (8mA). The part is currently active in production, ROHS3 compliant, and offers extended operating temperature range (-40°C ~ 125°C). This part provides the highest compatibility for direct replacement in existing designs.

SN74HC74N (Texas Instruments) is a similar substitute suitable for applications where reduced performance specifications are acceptable. Clock frequency is reduced to 60 MHz and propagation delay increases to 30ns @ 6V, 50pF. Output current is reduced to 5.2mA. The part is active in production and ROHS3 compliant. Operating temperature range matches the original part (-40°C ~ 85°C).

CD74HC74E (Harris Corporation) is a similar substitute with the lowest performance specifications. Clock frequency is 50 MHz, propagation delay is 30ns @ 6V, 50pF, and output current is 5.2mA. This part is obsolete and RoHS non-compliant. Use only when performance requirements permit and no other alternatives are available.

Frequently Asked Questions (FAQ)

Q: Can SN74AHC74N replace 74VHC74N in all applications?

A: Yes, for direct replacement. SN74AHC74N maintains identical electrical performance specifications (clock frequency, propagation delay, supply voltage, output current) and package configuration. The extended operating temperature range (-40°C ~ 125°C) provides additional margin.

Q: What are the limitations of using SN74HC74N as a substitute?

A: SN74HC74N has reduced clock frequency (60 MHz vs. 115 MHz) and increased propagation delay (30ns vs. 9.3ns). Output current is reduced to 5.2mA. These differences require design verification to confirm compatibility with timing-critical applications and high-current load requirements.

Q: Are all substitute parts pin-compatible?

A: Yes. All substitute parts use the 14-DIP (0.300", 7.62mm) package with identical pinout for dual D-type flip-flop functionality.

Q: Which substitute part has the best compliance status?

A: SN74AHC74N and SN74HC74N are both ROHS3 compliant and active in production. CD74HC74E is RoHS non-compliant and obsolete.

Q: What is the difference between 74VHC, 74AHC, and 74HC series?

A: 74VHC and 74AHC are advanced CMOS logic families with higher speed (115 MHz) and lower propagation delay (9.3ns). 74HC is a standard CMOS logic family with lower speed (50-60 MHz) and higher propagation delay (30ns). All three families share compatible pinouts and basic functionality.