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3KP30 Transient Voltage Suppressor - Equivalent & Substitute Parts
Part Overview
The 3KP30 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This component features a 30V reverse standoff voltage rating and 3000W peak pulse power handling capability in a through-hole P600 axial package.
The 3KP30 is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure continued availability for new production builds and field replacements where this device is specified.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 30 | V |
| Voltage - Breakdown (Min) | 31.55 | V |
| Voltage - Clamping (Max) @ Ipp | 50.82 | V |
| Current - Peak Pulse (10/1000µs) | 62 | A |
| Power - Peak Pulse | 3000 | W |
| Operating Temperature Range | -55 to 175 | °C (TJ) |
| Package / Case | P600, Axial | Through Hole |
| Type | Zener | Unidirectional |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KP30 is determined by the following critical parameters:
- Voltage Rating Match: Reverse standoff voltage must be 30V (±tolerance acceptable within standard TVS specifications)
- Package Compatibility: P600 axial through-hole package required for mechanical and electrical compatibility
- Unidirectional Configuration: Single-channel Zener TVS diode topology
- Power Handling: Peak pulse power rating must meet or exceed 3000W to maintain protection performance
- Temperature Range: Operating temperature range must encompass the application requirements
The 5KP30A from Diotec Semiconductor satisfies all substitution criteria. It maintains the 30V standoff voltage, uses the identical P600 axial package, and provides enhanced power handling (5000W) with improved peak pulse current capability (103A vs. 62A).
Parameter Comparison
| Parameter | 3KP30 (Littelfuse) | 5KP30A (Diotec) | Unit |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 30 | 30 | V |
| Voltage - Breakdown (Min) | 31.55 | 33.3 | V |
| Voltage - Clamping (Max) @ Ipp | 50.82 | 48.4 | V |
| Current - Peak Pulse (10/1000µs) | 62 | 103 | A |
| Power - Peak Pulse | 3000 | 5000 | W |
| Operating Temperature Range | -55 to 175 | -50 to 175 | °C (TJ) |
| Package / Case | P600, Axial | P600, Axial | Through Hole |
| Type | Zener, Unidirectional | Zener, Unidirectional | — |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | — |
| Product Status | Obsolete | Active | — |
Engineering Selection Recommendations
The 5KP30A is a direct functional substitute for the 3KP30. Both components are ROHS3 compliant and maintain identical voltage standoff ratings and package form factors.
The 5KP30A offers performance advantages: higher peak pulse power rating (5000W vs. 3000W), increased peak pulse current capability (103A vs. 62A), and lower clamping voltage (48.4V vs. 50.82V). These characteristics provide enhanced transient suppression performance without compromising circuit compatibility.
The 5KP30A maintains active product status with established supply chain availability, whereas the 3KP30 is obsolete. The 5KP30A is available in Tape & Reel packaging, suitable for automated assembly processes.
The minimum operating temperature of the 5KP30A is -50°C compared to -55°C for the 3KP30. Applications requiring operation below -50°C require design review.
Frequently Asked Questions (FAQ)
Q: Can the 5KP30A be used as a direct replacement for the 3KP30 in existing designs?
A: Yes. Both components share identical reverse standoff voltage (30V), package type (P600 axial), and unidirectional Zener topology. The 5KP30A provides equivalent or superior electrical performance across all critical parameters.
Q: What are the key differences between these two parts?
A: The 5KP30A provides higher peak pulse power handling (5000W vs. 3000W), greater peak pulse current (103A vs. 62A), and lower clamping voltage (48.4V vs. 50.82V). The minimum operating temperature differs by 5°C (-50°C vs. -55°C).
Q: Are both parts mechanically compatible in the same PCB footprint?
A: Yes. Both use the P600 axial through-hole package with identical mechanical dimensions and pin spacing.
Q: What is the significance of the lower clamping voltage in the 5KP30A?
A: Lower clamping voltage indicates more effective transient suppression, as the device clamps voltage spikes to a lower level, providing better protection for downstream components.
Q: Are there any compliance or certification differences?
A: Both components are ROHS3 compliant. The 5KP30A has active product status with established supply chain support, while the 3KP30 is obsolete.
Q: Can the 5KP30A handle higher transient currents than the 3KP30?
A: Yes. The 5KP30A is rated for 103A peak pulse current compared to 62A for the 3KP30, providing greater margin for high-energy transient events.
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