Littelfuse 3KP64 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP64 is a unidirectional transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. It features a 64V reverse standoff voltage with a 108.15V maximum clamping voltage and 29.1A peak pulse current capability in a through-hole P600 axial package. The 3KP64 is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	64	V
Voltage - Breakdown (Min)	67.37	V
Voltage - Clamping (Max) @ Ipp	108.15	V
Current - Peak Pulse (10/1000µs)	29.1	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	-
Package / Case	P600, Axial	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the obsolete 3KP64 is determined by the following critical electrical and mechanical parameters:

Voltage Class: 64V reverse standoff voltage (primary selection criterion)
Package Compatibility: P600 axial through-hole package (mechanical and thermal interface requirement)
Unidirectional Configuration: Single-channel zener TVS diode topology
Application Class: General-purpose transient voltage suppression
Thermal Performance: Operating temperature range compatibility

The 5KP64A from Diotec Semiconductor satisfies all substitution criteria. Both devices maintain identical 64V reverse standoff voltage and P600 axial package specifications, ensuring direct mechanical and electrical compatibility in existing circuit designs.

Parameter Comparison

Parameter	3KP64 (Littelfuse)	5KP64A (Diotec)	Unit
Voltage - Reverse Standoff (Typ)	64	64	V
Voltage - Breakdown (Min)	67.37	71.1	V
Voltage - Clamping (Max) @ Ipp	108.15	103	V
Current - Peak Pulse (10/1000µs)	29.1	49	A
Power - Peak Pulse	3000	5000	W
Operating Temperature (Min)	-55	-50	°C
Operating Temperature (Max)	175	175	°C
Mounting Type	Through Hole	Through Hole	-
Package / Case	P600, Axial	P600, Axial	-
Type	Zener	Zener	-
Unidirectional Channels	1	1	-

Engineering Selection Recommendations

The 5KP64A is the direct functional equivalent for the obsolete 3KP64. Selection is based on the following engineering factors:

Product Status: The 3KP64 is obsolete. The 5KP64A is active and in production, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: Both devices share the critical 64V reverse standoff voltage specification. The 5KP64A demonstrates superior performance characteristics with higher peak pulse current (49A vs. 29.1A) and greater peak pulse power (5000W vs. 3000W), providing enhanced transient suppression capability without compromising circuit protection thresholds.

Package Compatibility: Identical P600 axial through-hole packages enable direct mechanical substitution without PCB redesign or layout modification.

Compliance: The 3KP64 carries ROHS3 compliance certification. The 5KP64A RoHS status is listed as not applicable by the manufacturer. Verify RoHS compliance requirements with your supply chain or regulatory documentation if ROHS3 certification is mandatory for your application.

Temperature Range: The 5KP64A minimum operating temperature is -50°C compared to the 3KP64 at -55°C. Confirm this 5°C difference does not impact your application's thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5KP64A directly replace the 3KP64 in existing designs?

A: Yes. Both devices share identical 64V reverse standoff voltage and P600 axial package specifications. Direct mechanical and electrical substitution is possible without circuit modification.

Q: What are the key differences between these devices?

A: The 5KP64A provides higher peak pulse current (49A vs. 29.1A) and greater peak pulse power (5000W vs. 3000W). The 5KP64A has a slightly higher minimum breakdown voltage (71.1V vs. 67.37V) and lower maximum clamping voltage (103V vs. 108.15V). The 5KP64A minimum operating temperature is -50°C versus -55°C for the 3KP64.

Q: Are there any compliance considerations when substituting?

A: The 3KP64 is ROHS3 compliant. The 5KP64A RoHS status is not applicable per the manufacturer. Verify your application's compliance requirements before implementation.

Q: Why does the 5KP64A have higher power and current ratings?

A: The 5KP64A is from the 5KP series, which is a higher-power TVS diode family compared to the 3KP series. Both maintain the same voltage class (64V), making them functionally equivalent for voltage protection, while the 5KP64A offers enhanced transient energy absorption capability.

Q: Is the P600 package the same for both devices?

A: Yes. Both devices use the P600 axial through-hole package, ensuring identical footprint and mounting compatibility.

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