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30KPA168 Equivalent & Substitute Parts
Part Overview
The 30KPA168 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 168V reverse standoff voltage rating and 286.02V maximum clamping voltage with 111.2A peak pulse current capability in a through-hole P600 axial package.
The 30KPA168 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 168 | V |
| Voltage - Breakdown (Min) | 177.38 | V |
| Voltage - Clamping (Max) @ Ipp | 286.02 | V |
| Current - Peak Pulse (10/1000µs) | 111.2 | A |
| Power - Peak Pulse | 30000 | W |
| Operating Temperature Range | -55 to 175 | °C (TJ) |
| Package / Case | P600, Axial | Through Hole |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitution of the 30KPA168 is determined by strict equivalence across the following critical parameters:
- Voltage Rating: Reverse standoff voltage of 168V (±tolerance)
- Clamping Performance: Maximum clamping voltage and breakdown voltage characteristics
- Current Handling: Peak pulse current of 111.2A at 10/1000µs pulse width
- Power Dissipation: Peak pulse power rating of 30000W
- Package Compatibility: P600 axial through-hole package
- Thermal Range: Operating temperature range of -55°C to 175°C (TJ)
- Device Type: Unidirectional Zener TVS diode configuration
The 30KPA168A meets these substitution criteria while maintaining functional and mechanical compatibility with the original component.
Parameter Comparison
| Parameter | 30KPA168 (Littelfuse) | 30KPA168A (MDE Semiconductor) | Compatibility |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 168V | 168V | Equivalent |
| Voltage - Breakdown (Min) | 177.38V | 187.7V | Within tolerance band |
| Voltage - Clamping (Max) @ Ipp | 286.02V | 272.4V | Acceptable variation |
| Current - Peak Pulse (10/1000µs) | 111.2A | 111.2A | Equivalent |
| Power - Peak Pulse | 30000W | 30000W | Equivalent |
| Operating Temperature Range | -55°C to 175°C (TJ) | -55°C to 175°C (TJ) | Equivalent |
| Package / Case | P600, Axial | P600, Axial | Equivalent |
| Type | Zener | Zener | Equivalent |
| Unidirectional Channels | 1 | 1 | Equivalent |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Equivalent |
Engineering Selection Recommendations
Product Status Consideration: The 30KPA168 is obsolete, while the 30KPA168A is active. The 30KPA168A is the direct manufacturer-designated substitute and maintains active production status, ensuring long-term availability and supply chain reliability.
Compliance & Certifications: Both components are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications, confirming regulatory equivalence for export and procurement purposes.
Electrical Performance: The 30KPA168A demonstrates equivalent peak pulse current (111.2A) and power dissipation (30000W) characteristics. The clamping voltage of 272.4V on the 30KPA168A is lower than the original 286.02V, representing improved transient suppression performance within the same voltage class.
Inventory & Availability: The 30KPA168A is available in significantly higher quantities (2163 pcs) compared to the obsolete 30KPA168 (827 pcs), supporting both new designs and legacy system support.
Frequently Asked Questions (FAQ)
Q: Can the 30KPA168A be used as a direct replacement for the 30KPA168?
A: Yes. The 30KPA168A is electrically and mechanically equivalent. Both components share identical reverse standoff voltage (168V), peak pulse current (111.2A), power dissipation (30000W), operating temperature range (-55°C to 175°C), and P600 axial through-hole package configuration.
Q: What is the difference in clamping voltage between these parts?
A: The 30KPA168 has a maximum clamping voltage of 286.02V, while the 30KPA168A is rated at 272.4V. The lower clamping voltage of the 30KPA168A represents improved transient suppression performance and remains within acceptable operating parameters for 168V standoff voltage class applications.
Q: Are there any compliance or certification differences?
A: No. Both components are ROHS3 compliant and carry identical regulatory classifications (ECCN: EAR99, HTSUS: 8541.10.0080). The 30KPA168A includes documented REACH compliance information availability, providing additional regulatory transparency.
Q: What is the package compatibility?
A: Both the 30KPA168 and 30KPA168A use the P600 axial through-hole package. They are mechanically and electrically interchangeable in PCB layouts designed for this package type.
Q: Why is the 30KPA168 obsolete?
A: The 30KPA168 has been discontinued by Littelfuse Inc. The 30KPA168A, manufactured by MDE Semiconductor Inc., is the active equivalent replacement and is recommended for all new designs and ongoing production requirements.
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