5KP24-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP24-B is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 24V reverse standoff voltage rating with a 40.85V maximum clamping voltage and 5000W peak pulse power handling capability in a P600 axial through-hole package.

The 5KP24-B is classified as obsolete. Identifying suitable substitute components ensures design continuity and maintains protection performance in applications requiring transient voltage suppression at the 24V nominal level.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP24-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	24V
Voltage - Breakdown (Min)	25.29V
Voltage - Clamping (Max) @ Ipp	40.85V
Power - Peak Pulse	5000W (5kW)
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 of the 5KP24-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage must be 24V nominal to maintain circuit protection thresholds
Clamping Voltage: Maximum clamping voltage at peak pulse current determines transient suppression effectiveness
Power Dissipation: Peak pulse power rating of 5000W establishes thermal and current handling capability
Package Type: P600 axial through-hole package defines mechanical and electrical interface compatibility
Unidirectionality: Single-channel unidirectional configuration for standard transient protection
Temperature Range: Operating range of -55°C to 175°C ensures performance across industrial applications
Compliance: ROHS3 compliance and general-purpose application classification

Substitute parts are grouped into two categories based on package compatibility and electrical performance alignment:

Category A - Direct Package Compatibility (P600 Axial) Parts maintaining the P600 axial package with 24V nominal rating and 5000W power dissipation.

Category B - Alternative Package Options (DO-15/DO-201 Axial) Parts with equivalent voltage protection characteristics but different package form factors, suitable when mechanical constraints permit package substitution.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status
5KP24-B	Littelfuse Inc.	24V	40.85V	5000W	P600, Axial	Obsolete
5KP24A	Littelfuse Inc.	24V	38.9V	5000W	P600, Axial	Active
5KP24A-B	Littelfuse Inc.	24V	38.9V	5000W	P600, Axial	Active
SLD24U-017-B	Littelfuse Inc.	24V	38.9V	5000W	P600, Axial	Active
1.5KE30A	Taiwan Semiconductor Corporation	25.6V	41.4V	1500W	DO-201AA, DO-27, Axial	Active
1.5KE33A	Good-Ark Semiconductor	28.2V	45.7V	1500W	DO-201AE, Axial	Active
5KP30A	Diotec Semiconductor	30V	48.4V	5000W	P600, Axial	Active
P6KE30A	Taiwan Semiconductor Corporation	25.6V	41.4V	600W	DO-204AC, DO-15, Axial	Active
P6KE33A	Fairchild Semiconductor	28.2V	45.7V	600W	DO-204AC, DO-15, Axial	Active
SA30A	Taiwan Semiconductor Corporation	30V	64.3V	500W	DO-204AC, DO-15, Axial	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended)

5KP24A and 5KP24A-B are direct functional replacements manufactured by Littelfuse Inc. Both maintain the 24V reverse standoff voltage, P600 axial package, and 5000W power dissipation of the original 5KP24-B. These parts are in active production status with ROHS3 compliance. The 5KP24A is available in cut tape packaging, while 5KP24A-B is supplied in bulk format. Clamping voltage is 38.9V, which is lower than the original 40.85V specification but remains within acceptable transient suppression parameters for 24V nominal protection circuits.

SLD24U-017-B is an automotive-grade alternative from Littelfuse Inc. with AEC-Q101 qualification. It maintains identical electrical specifications to 5KP24A (24V standoff, 38.9V clamping, 5000W power) in the P600 axial package. This option is suitable for applications requiring automotive-grade component certification.

Secondary Substitutes (Alternative Package Options)

1.5KE30A (Taiwan Semiconductor Corporation) and 1.5KE33A (Good-Ark Semiconductor) provide transient suppression in the DO-201 axial package. These parts operate at higher voltage ratings (25.6V and 28.2V respectively) with reduced power dissipation (1500W). Selection of these alternatives requires confirmation that the application circuit can accommodate the higher standoff voltage and reduced peak pulse power handling.

5KP30A (Diotec Semiconductor) maintains the P600 axial package and 5000W power rating but operates at 30V reverse standoff voltage. This part is suitable only for applications where the higher voltage rating does not compromise circuit protection requirements.

P6KE30A and P6KE33A (DO-15 package) and SA30A (DO-15 package) offer reduced power dissipation (600W and 500W respectively) in compact axial packages. These options are applicable only to low-energy transient suppression circuits where peak pulse power requirements are significantly lower than the original 5000W specification.

Frequently Asked Questions (FAQ)

Q: Can 5KP24A directly replace 5KP24-B without circuit modification?

A: Yes. The 5KP24A maintains the same 24V reverse standoff voltage, P600 axial package, and 5000W peak pulse power rating. The clamping voltage is 38.9V compared to 40.85V in the original part, representing a 4.8% reduction that remains within acceptable transient suppression performance for 24V protection circuits. No circuit modification is required.

Q: What is the difference between 5KP24A and 5KP24A-B?

A: Both parts are electrically identical with 24V standoff voltage, 38.9V clamping voltage, and 5000W power dissipation in the P600 axial package. The difference is packaging format: 5KP24A is supplied in cut tape, while 5KP24A-B is supplied in bulk. Selection depends on procurement and assembly requirements.

Q: Can I use 1.5KE30A as a substitute for 5KP24-B?

A: 1.5KE30A is not a direct substitute. While it provides transient voltage suppression, it operates at 25.6V reverse standoff voltage (higher than 24V) and has significantly reduced power dissipation (1500W versus 5000W). This part is suitable only if the application circuit can tolerate the higher voltage threshold and lower peak pulse power handling. Package form factor also differs (DO-201 versus P600).

Q: Why is SA30A listed as a substitute if it has higher clamping voltage and lower power rating?

A: SA30A is included as an alternative option for applications where mechanical space constraints require a compact DO-15 package and where transient energy levels are lower than the original 5000W specification. The 30V standoff voltage and 64.3V clamping voltage represent a different protection profile suitable only for specific circuit requirements. This part should not be selected as a general replacement without circuit analysis.

Q: Is SLD24U-017-B suitable for automotive applications?

A: Yes. SLD24U-017-B carries AEC-Q101 automotive qualification and is suitable for automotive-grade applications. It maintains the same electrical specifications as 5KP24A (24V standoff, 38.9V clamping, 5000W power) in the P600 axial package with automotive-grade reliability assurance.

Q: What package compatibility considerations apply when selecting a substitute?

A: The original 5KP24-B uses a P600 axial through-hole package. Direct substitutes 5KP24A, 5KP24A-B, and SLD24U-017-B maintain this package form factor and require no mechanical redesign. Alternative packages (DO-201 and DO-15) have different physical dimensions and pin spacing. Package substitution requires verification of PCB layout compatibility and mechanical clearance before implementation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, consistent with the original 5KP24-B specification.

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