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Littelfuse 5KP24 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts
Part Overview
The Littelfuse 5KP24 is a unidirectional transient voltage suppressor diode designed for general-purpose overvoltage protection applications. This through-hole P600 axial package component operates across a temperature range of -55°C to 175°C and provides 5000W peak pulse power dissipation capability. The 5KP24 is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | 5KP24 | — |
| Manufacturer | Littelfuse Inc. | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 24 | V |
| Voltage - Breakdown (Min) | 25.29 | V |
| Voltage - Clamping (Max) @ Ipp | 40.85 | V |
| Power - Peak Pulse | 5000 | W |
| Mounting Type | Through Hole | — |
| Package / Case | P600, Axial | — |
| Operating Temperature | -55 to 175 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution of the 5KP24 is determined by the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Unidirectional channel configuration (1 channel required)
- Reverse standoff voltage tolerance around 24V nominal
- Clamping voltage performance within the 38.9V to 48.4V range
- Peak pulse power rating of 5000W or higher
- Through-hole axial mounting compatibility
- Operating temperature range of -55°C to 175°C minimum
- ROHS3 compliance
Substitute Categories:
Category A - Direct Electrical Equivalents (P600 Package, 5000W): Components maintaining identical package form factor and power rating with equivalent voltage characteristics.
Category B - Functional Equivalents (Alternative Packages, Reduced Power): Components with compatible voltage performance but different package types (DO-201, DO-15) and lower power ratings (1500W, 600W, 500W). These require mechanical redesign but maintain electrical protection function.
Category C - Automotive-Grade Equivalent (P600 Package, 5000W): AEC-Q101 qualified component with identical electrical and mechanical specifications.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (Max) @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Package / Case | Product Status | Operating Temp (°C) |
|---|---|---|---|---|---|---|---|---|
| 5KP24 | Littelfuse Inc. | 24 | 40.85 | — | 5000 | P600, Axial | Obsolete | -55 to 175 |
| 5KP24A | Littelfuse Inc. | 24 | 38.9 | 131.1 | 5000 | P600, Axial | Active | -55 to 175 |
| SLD24U-017-B | Littelfuse Inc. | 24 | 38.9 | 131.1 | 5000 | P600, Axial | Active | -55 to 175 |
| 5KP30A | Diotec Semiconductor | 30 | 48.4 | 103 | 5000 | P600, Axial | Active | -50 to 175 |
| 1.5KE30A | Taiwan Semiconductor Corporation | 25.6 | 41.4 | 38 | 1500 | DO-201AA, Axial | Active | -55 to 175 |
| 1.5KE33A | Good-Ark Semiconductor | 28.2 | 45.7 | 32.8 | 1500 | DO-201AE, Axial | Active | -55 to 175 |
| P6KE30A | Taiwan Semiconductor Corporation | 25.6 | 41.4 | 14.5 | 600 | DO-15, Axial | Active | — |
| P6KE33A | Fairchild Semiconductor | 28.2 | 45.7 | 13.8 | 600 | DO-15, Axial | Active | -50 to 175 |
| SA30A | Taiwan Semiconductor Corporation | 30 | 64.3 | 10.8 | 500 | DO-15, Axial | Active | -55 to 175 |
Engineering Selection Recommendations
Primary Recommendation - Direct Replacement (No Redesign Required):
The 5KP24A (Littelfuse Inc.) and SLD24U-017-B (Littelfuse Inc.) are direct functional equivalents. Both maintain the P600 axial package, 5000W peak pulse power rating, 24V reverse standoff voltage, and -55°C to 175°C operating temperature range. Both components are active products with ROHS3 compliance. The SLD24U-017-B carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.
Secondary Recommendation - Same Package, Higher Voltage Rating:
The 5KP30A (Diotec Semiconductor) provides identical P600 packaging and 5000W power rating with a 30V reverse standoff voltage. This component is suitable for applications where higher voltage protection is acceptable. Operating temperature minimum is -50°C versus -55°C for the original part.
Alternative Recommendation - Different Package, Lower Power Rating:
The 1.5KE30A (Taiwan Semiconductor Corporation) and 1.5KE33A (Good-Ark Semiconductor) offer 1500W peak pulse power in DO-201 axial packages. These components are suitable for lower-power applications or space-constrained designs where the reduced power rating is acceptable. Both maintain ROHS3 compliance and -55°C to 175°C operating temperature range.
The P6KE30A (Taiwan Semiconductor Corporation) and P6KE33A (Fairchild Semiconductor) provide 600W peak pulse power in DO-15 axial packages. These are appropriate for low-power signal protection applications only.
Compliance Consideration:
All recommended substitutes maintain ROHS3 compliance. The SLD24U-017-B additionally carries AEC-Q101 automotive qualification for applications requiring automotive-grade component certification.
Frequently Asked Questions (FAQ)
Q: Can the 5KP24A directly replace the obsolete 5KP24 without circuit modification?
A: Yes. The 5KP24A maintains identical package form factor (P600 axial), electrical specifications (24V reverse standoff, 40.85V clamping voltage range), and power rating (5000W). No circuit redesign is required.
Q: What is the difference between the 5KP24A and SLD24U-017-B?
A: Both components are electrically and mechanically identical with 24V standoff voltage, 38.9V clamping voltage, and 5000W power rating in P600 packages. The SLD24U-017-B carries AEC-Q101 automotive qualification; the 5KP24A does not. Selection depends on automotive certification requirements.
Q: Can I use the 5KP30A as a substitute for the 5KP24?
A: The 5KP30A is functionally compatible with identical P600 packaging and 5000W power rating. However, it has a 30V reverse standoff voltage versus 24V for the original part. This higher voltage rating is suitable only if the application circuit can tolerate increased protection threshold voltage.
Q: Why would I choose a 1.5KE30A over the 5KP24A?
A: The 1.5KE30A is appropriate only if circuit board space is severely constrained or if the application requires lower power dissipation (1500W versus 5000W). The DO-201 package is physically smaller than P600. This substitution requires mechanical redesign of the circuit board layout.
Q: Are the DO-15 package components (P6KE30A, P6KE33A) suitable replacements?
A: The DO-15 package components are suitable only for low-power signal protection applications. With 600W peak pulse power ratings, they are inadequate for applications requiring the original 5000W protection capability. These components require both mechanical redesign and circuit re-evaluation.
Q: What is the operating temperature difference between the 5KP24 and 5KP30A?
A: The 5KP24 operates from -55°C to 175°C. The 5KP30A operates from -50°C to 175°C. The 5KP30A has a 5°C higher minimum operating temperature. This difference is significant only for applications requiring operation below -50°C.
Q: Do all substitute parts have ROHS3 compliance?
A: Yes. All recommended substitute components listed in the parameter comparison table maintain ROHS3 compliance, matching the environmental compliance status of the original 5KP24.
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