74HCT74N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT74N,652 is a dual D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., housed in a 14-DIP through-hole package. This component functions as a 2-element D-type flip-flop with complementary outputs, positive edge triggering, and set/reset capability. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and new production requirements. Substitute parts must maintain functional equivalence across electrical characteristics, logic family compatibility, and package specifications.

Substiute Parts

74HCT74N,652

NXP USA Inc.In Stock: 81174HCT74N,652 Datasheet

Current PartRFQ

CD74HCT74E

Texas InstrumentsIn Stock: 1973CD74HCT74E Datasheet

UpgradeRFQ

74HCT74D,653

NXP SemiconductorsIn Stock: 1945774HCT74D,653 Datasheet

MFR RecommendedRFQ

SN74HCT74N

Texas InstrumentsIn Stock: 5983SN74HCT74N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HCT74N,652 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Logic family: 74HCT series
• Function: Dual D-type flip-flop with complementary outputs and positive edge triggering
• Number of elements: 2
• Number of bits per element: 1
• Output type: Complementary
• Set/Reset function capability
• Voltage supply range: 4.5V ~ 5.5V
• Package compatibility: 14-DIP or equivalent surface-mount alternatives (14-SOIC)
• Mounting type: Through-hole or surface-mount

Substitute parts are grouped into two categories:

1. Direct Package Equivalent (Through-Hole 14-DIP): Parts maintaining identical 14-DIP through-hole packaging for direct socket replacement without PCB modification.

2. Package Alternative (Surface-Mount 14-SOIC): Parts offering the same logic function in surface-mount packaging, requiring PCB redesign but providing active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

For Direct Through-Hole Replacement (No PCB Modification):

SN74HCT74N (Texas Instruments) and CD74HCT74E (Texas Instruments) both provide active product status with 14-DIP through-hole packaging. SN74HCT74N offers improved propagation delay performance (25 ns @ 5.5V) and lower quiescent current (4 µA), making it the preferred choice for new designs requiring enhanced speed characteristics. CD74HCT74E provides comparable performance with extended temperature range (-55°C ~ 125°C) and is available in tube packaging. Both parts maintain full ROHS3 compliance and are actively manufactured.

For Surface-Mount Implementation (PCB Redesign Required):

74HCT74D,653 (NXP Semiconductors) offers active product status in 14-SOIC surface-mount packaging with high inventory availability (19,375 pcs). This part maintains identical electrical characteristics to the original 74HCT74N,652, including 59 MHz clock frequency and 44 ns propagation delay, while providing the manufacturing advantages of surface-mount technology. This option is suitable for new PCB designs or redesigns targeting modern manufacturing processes.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with current environmental and safety standards. Selection should prioritize active product status to ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can I use CD74HCT74E as a direct replacement for 74HCT74N,652 without any circuit modifications?

A: Yes. CD74HCT74E is pin-compatible and functionally equivalent, housed in the same 14-DIP through-hole package. No circuit modifications are required. However, note that CD74HCT74E has lower quiescent current (4 µA vs. 40 µA) and improved propagation delay (35 ns vs. 44 ns), which may affect timing-sensitive applications.

Q: What is the difference between the through-hole and surface-mount substitute options?

A: SN74HCT74N and CD74HCT74E are through-hole 14-DIP packages suitable for direct socket replacement. 74HCT74D,653 is a surface-mount 14-SOIC package requiring PCB redesign. All three are functionally equivalent and maintain the same logic family and electrical specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (CD74HCT74E, 74HCT74D,653, and SN74HCT74N) are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: Which substitute part has the best performance characteristics?

A: SN74HCT74N offers the fastest propagation delay (25 ns @ 5.5V) and lowest quiescent current (4 µA). However, its operating temperature range is limited to -40°C ~ 85°C. CD74HCT74E provides extended temperature range (-55°C ~ 125°C) with good performance metrics (35 ns propagation delay, 4 µA quiescent current).

Q: Can I use these parts interchangeably in existing designs?

A: Yes, for through-hole applications. SN74HCT74N and CD74HCT74E are pin-compatible with 74HCT74N,652 and can be used interchangeably without PCB modification. 74HCT74D,653 requires PCB redesign due to different package type (surface-mount vs. through-hole).

Q: What is the inventory status of these substitute parts?

A: CD74HCT74E has 1,900 pcs available; SN74HCT74N has 5,880 pcs available; 74HCT74D,653 has 19,375 pcs available. All parts are actively manufactured and in stock.

Q: Are there any electrical parameter differences I should be aware of?

A: All parts maintain the same voltage supply range (4.5V ~ 5.5V) and output current specifications (4mA). Minor variations exist in quiescent current, propagation delay, and input capacitance. Refer to the Parameter Comparison table for detailed specifications.