Equivalent & Substitute Parts for 3KP24-B TVS Diode

Part Overview

The 3KP24-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 24V reverse standoff voltage with a 40.85V maximum clamping voltage and 77.1A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KP24-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	24V
Voltage - Clamping (Max) @ Ipp	40.85V
Current - Peak Pulse (10/1000µs)	77.1A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 3KP24-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage must be 24V (±tolerance per manufacturer specifications)
Package Type: Through-hole axial configuration (P600 or equivalent mechanical form factor)
Clamping Voltage: Maximum clamping voltage at peak pulse current should not exceed 40.85V to maintain circuit protection integrity
Peak Pulse Current: Minimum 77.1A capability at 10/1000µs pulse width
Power Dissipation: Minimum 3000W peak pulse power rating
Operating Temperature Range: -55°C to 175°C junction temperature
Compliance: ROHS3 compliance required

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (P600 Package): Parts maintaining identical or superior electrical performance with P600 axial packaging, suitable for direct board-level replacement without mechanical modification.

Category B - Functional Equivalents (Alternative Packages): Parts meeting electrical specifications but with different package configurations (DO-15, R-6), requiring mechanical adaptation or board redesign.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
3KP24-B	Littelfuse Inc.	24V	40.85V	77.1A	3000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP24A-B	Littelfuse Inc.	24V	38.9V	131.1A	5000W	P600, Axial	Active	ROHS3 Compliant
15KPA24AE3/TR13	Microchip Technology	24V	40.7V	371A	15000W	P600, Axial	Active	ROHS3 Compliant
15KPA24E3/TR13	Microchip Technology	24V	—	—	15000W	P600, Axial	Active	ROHS3 Compliant
3KP24A-TP	Micro Commercial Co	24V	38.9V	—	3000W	R-6, Axial	Active	ROHS3 Compliant
5KP24A-E3/54	Vishay General Semiconductor	24V	38.9V	129A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP24A-E3/73	Vishay General Semiconductor	24V	38.9V	129A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP24AHE3/54	Vishay General Semiconductor	24V	38.9V	129A	5000W	P600, Axial	Active	ROHS3 Compliant
P5KE24A-AP	Micro Commercial Co	24V	38.9V	12.8A	500W	DO-15, Axial	Active	—
P5KE24A-BP	Micro Commercial Co	24V	38.9V	12.8A	500W	DO-15, Axial	Active	—
P5KE24A-TP	Micro Commercial Co	24V	38.9V	12.8A	500W	DO-15, Axial	Active	—

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - P600 Package)

The 5KP24A-E3/54 and 5KP24A-E3/73 from Vishay General Semiconductor are the preferred direct substitutes. Both maintain the P600 axial package, meet or exceed the 3KP24-B electrical specifications with 38.9V clamping voltage and 129A peak pulse current, and are active products with ROHS3 compliance. The 5KP24A-B from Littelfuse Inc. offers superior performance with 131.1A peak pulse current and 5000W power rating while maintaining package compatibility.

The 15KPA24AE3/TR13 from Microchip Technology provides the highest performance margin with 371A peak pulse current and 15000W power rating, suitable for applications requiring enhanced transient protection. The 15KPA24E3/TR13 variant is also available with equivalent performance specifications.

Secondary Substitutes (Alternative Package - R-6 or DO-15)

The 3KP24A-TP from Micro Commercial Co maintains the 3000W power rating and 38.9V clamping voltage but uses an R-6 axial package instead of P600. This requires mechanical board redesign or adapter solutions.

The P5KE24A-AP, P5KE24A-BP, and P5KE24A-TP variants use DO-15 packaging with significantly reduced peak pulse current (12.8A) and power rating (500W). These are suitable only for low-energy transient suppression applications and are not recommended as direct replacements for the 3KP24-B in high-current protection circuits.

Automotive-Grade Option

The 5KP24AHE3/54 from Vishay General Semiconductor is qualified to AEC-Q101 automotive standards, providing equivalent electrical performance to the standard 5KP24A-E3/54 with automotive-grade reliability certification.

Frequently Asked Questions (FAQ)

Q: Can the P5KE24A series (DO-15 package) replace the 3KP24-B?

A: The P5KE24A series is electrically compatible for 24V standoff voltage and clamping characteristics but is not recommended as a direct replacement. The peak pulse current rating of 12.8A and power dissipation of 500W are significantly lower than the 3KP24-B specification of 77.1A and 3000W. Use only in applications with confirmed low-energy transient requirements.

Q: What is the difference between 5KP24A-E3/54 and 5KP24A-E3/73?

A: Both parts are electrically identical with 24V standoff voltage, 38.9V clamping voltage, 129A peak pulse current, and 5000W power rating in P600 axial packaging. The suffix designations (E3/54 and E3/73) indicate different packaging or tape configurations. Either is suitable for direct replacement of the 3KP24-B.

Q: Is the 5KP24AHE3/54 suitable for non-automotive applications?

A: Yes. The 5KP24AHE3/54 meets AEC-Q101 automotive qualification but is fully compatible with general-purpose applications. It provides the same electrical performance as the standard 5KP24A-E3/54 with additional reliability certification.

Q: Why is the 15KPA24AE3/TR13 rated for 15000W when the 3KP24-B is only 3000W?

A: The 15KPA24AE3/TR13 is a higher-performance device in the same package family. The increased power rating reflects superior thermal management and transient handling capability. It is a valid substitute that provides enhanced protection margin without compatibility issues.

Q: Can I use the 3KP24A-TP (R-6 package) as a direct board replacement?

A: No. The R-6 package has different mechanical dimensions than the P600 package. Board-level replacement requires either mechanical adaptation or PCB redesign. Electrical performance is equivalent at 3000W and 38.9V clamping voltage.

Q: Are all substitute parts ROHS3 compliant?

A: The Littelfuse, Microchip, and Vishay parts listed are ROHS3 compliant. The Micro Commercial Co P5KE24A series does not specify ROHS status in the provided data. Verify compliance requirements with your procurement specifications before selection.

Q: What is the operating temperature range for substitute parts?

A: All listed substitutes operate across -55°C to 175°C junction temperature, matching the 3KP24-B specification. The P5KE24A series extends to -65°C minimum, providing wider low-temperature operation if required.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message