74HCT534N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT534N,652 is a D-Type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 8-bit data storage and transfer applications. This device features tri-state, inverted outputs and operates across a 4.5V to 5.5V supply voltage range with a maximum clock frequency of 40 MHz. The part is classified as obsolete, making identification of functionally equivalent substitutes essential for ongoing system maintenance, repair, and legacy design support.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT534N,652
Manufacturer	NXP USA Inc.
Category	Logic
Description	IC FF D-TYPE SNGL 8BIT 20DIP
Type	D-Type Flip Flop, 1 Element, 8 Bit
Output Type	Tri-State, Inverted
Clock Frequency	40 MHz
Voltage - Supply	4.5V ~ 5.5V
Trigger Type	Positive Edge
Package / Case	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 74HCT534N,652 is determined by strict equivalence across the following critical parameters:

Logic Function: D-Type flip-flop with 1 element, 8-bit configuration
Output Configuration: Tri-state, inverted outputs
Trigger Mechanism: Positive edge triggering
Package Type: 20-DIP (0.300", 7.62mm) through-hole mounting
Electrical Specifications: 4.5V to 5.5V supply voltage, positive edge trigger
Pin Compatibility: Identical pin count and signal routing

The CD74HCT534E, manufactured by Harris Corporation, meets all functional and electrical requirements for direct substitution. Both devices share the same base product number (74HCT534) and maintain compatibility across all critical operating parameters within specified tolerances.

Parameter Comparison

Parameter	74HCT534N,652 (NXP)	CD74HCT534E (Harris)	Compatibility
Type	D-Type, 1 Element, 8 Bit	D-Type, 1 Element, 8 Bit	Equivalent
Output Type	Tri-State, Inverted	Tri-State, Inverted	Equivalent
Trigger Type	Positive Edge	Positive Edge	Equivalent
Clock Frequency	40 MHz	50 MHz	Compatible (substitute exceeds specification)
Max Propagation Delay @ 4.5V, 50pF	30 ns	35 ns	Compatible (within tolerance)
Current - Output High, Low	6 mA, 6 mA	6 mA, 6 mA	Equivalent
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	Equivalent
Current - Quiescent (Iq)	8 µA	8 µA	Equivalent
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	Compatible (substitute exceeds specification)
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent

Engineering Selection Recommendations

The CD74HCT534E is a direct functional substitute for the 74HCT534N,652. Both devices are classified as obsolete, reflecting their legacy status in modern component inventories. The Harris Corporation variant demonstrates superior performance specifications in clock frequency (50 MHz vs. 40 MHz) and extended lower operating temperature range (-55°C vs. -40°C), making it suitable for applications requiring enhanced thermal performance.

The primary consideration for selection is compliance status. The 74HCT534N,652 maintains ROHS3 compliance, while the CD74HCT534E is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the NXP variant is the appropriate choice. For legacy systems without such constraints, the Harris substitute provides equivalent functionality with performance headroom.

Both devices share identical electrical characteristics for supply voltage, output current, quiescent current, and pin configuration, ensuring seamless integration into existing circuit designs without modification.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT534E replace the 74HCT534N,652 in my circuit?

A: Yes. Both devices are functionally equivalent D-Type flip-flops with identical logic function, output configuration, trigger mechanism, and package type. The CD74HCT534E meets or exceeds all electrical specifications of the original part.

Q: What is the difference in clock frequency between these parts?

A: The 74HCT534N,652 operates at a maximum of 40 MHz, while the CD74HCT534E operates at 50 MHz. The substitute part exceeds the original specification, providing additional performance margin without affecting compatibility.

Q: Are there temperature range differences?

A: Yes. The 74HCT534N,652 operates from -40°C to 125°C, while the CD74HCT534E operates from -55°C to 125°C. The substitute part supports a wider lower temperature range, beneficial for applications in extreme cold environments.

Q: What is the significance of the RoHS compliance difference?

A: The 74HCT534N,652 is ROHS3 compliant, meeting current environmental regulations for hazardous substance restrictions. The CD74HCT534E is RoHS non-compliant, indicating it may contain restricted substances. Selection depends on regulatory requirements for your application or end market.

Q: Are the packages identical?

A: Yes. Both devices use 20-DIP (0.300", 7.62mm) through-hole packaging with identical pin configurations, allowing direct board-level substitution without layout modifications.

Q: What is the propagation delay difference?

A: The 74HCT534N,652 has a maximum propagation delay of 30 ns at 4.5V with 50 pF load, while the CD74HCT534E has 35 ns under the same conditions. Both values are within acceptable tolerance for standard logic applications.

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

A: Both parts are obsolete. For new designs, consult current component datasheets and availability. If legacy compatibility is required, either part provides equivalent functionality within the specified electrical and thermal parameters.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message