Littelfuse 30KPA45 TVS Diode Equivalent & Substitute Parts

Part Overview

The Littelfuse 30KPA45 is a unidirectional Zener-type transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This component features a 45V reverse standoff voltage with an 81.27V maximum clamping voltage and can handle peak pulse currents of 391.5A at 30kW peak pulse power. The device is mounted in a through-hole P600 axial package and operates across a temperature range of -55°C to 175°C.

The 30KPA45 has reached obsolete product status. Identifying qualified substitute components ensures continued availability for repair, maintenance, and new production applications while maintaining electrical and mechanical compatibility with existing designs.

Substiute Parts

30KPA45

Littelfuse Inc.In Stock: 101530KPA45 Datasheet

Current PartRFQ

30KPA45A

MDE Semiconductor IncIn Stock: 210730KPA45A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 30KPA45 is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 45V and breakdown voltage minimum of 47.53V establish the protection threshold. Substitute parts must maintain this voltage class.
• Current Handling: Peak pulse current of 391.5A at 10/1000µs pulse duration defines the surge capacity. Substitute parts must support this current specification.
• Power Dissipation: Peak pulse power of 30kW establishes thermal performance requirements. Substitute parts must handle this power level.
• Package Compatibility: Through-hole P600 axial package ensures mechanical and electrical fit in existing PCB designs.
• Temperature Range: Operating range of -55°C to 175°C (junction temperature) must be maintained.
• Device Type: Unidirectional Zener-type TVS diode configuration must be preserved.

The 30KPA45A qualifies as a direct substitute based on matching all critical electrical parameters and package specifications while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The 30KPA45A is a qualified substitute for the obsolete 30KPA45 based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical reverse standoff voltage (45V), peak pulse current (391.5A), and peak pulse power (30kW) specifications. The 30KPA45A exhibits a lower maximum clamping voltage (77.4V versus 81.27V), which provides improved clamping performance and enhanced transient suppression.

Package Compatibility: Both devices use the P600 axial through-hole package, ensuring direct mechanical and electrical compatibility with existing PCB layouts and component footprints.

Compliance & Availability: The 30KPA45A holds active product status with ROHS3 compliance certification, ensuring long-term supply chain availability and regulatory compliance. The 30KPA45 is obsolete and subject to supply discontinuation.

Temperature Performance: Both parts operate across the full -55°C to 175°C junction temperature range, maintaining performance across industrial and extended temperature applications.

Selection of the 30KPA45A eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with designs originally specified for the 30KPA45.

Frequently Asked Questions (FAQ)

Q: Can the 30KPA45A be used as a direct replacement for the 30KPA45 in existing designs?

A: Yes. The 30KPA45A is electrically and mechanically compatible with the 30KPA45. Both devices share identical reverse standoff voltage (45V), peak pulse current (391.5A), power dissipation (30kW), operating temperature range (-55°C to 175°C), and P600 axial through-hole package specifications. The 30KPA45A actually provides superior clamping performance with a lower maximum clamping voltage (77.4V versus 81.27V).

Q: What are the key differences between the 30KPA45 and 30KPA45A?

A: The primary differences are manufacturer (Littelfuse Inc. versus MDE Semiconductor Inc), product status (obsolete versus active), and clamping voltage specification (81.27V maximum versus 77.4V maximum). All other electrical and mechanical parameters are identical. The lower clamping voltage of the 30KPA45A represents improved transient suppression performance.

Q: Are both parts RoHS compliant?

A: Yes. Both the 30KPA45 and 30KPA45A are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: Does the package type remain the same for both parts?

A: Yes. Both devices use the P600 axial through-hole package. No PCB layout modifications or component footprint changes are required when substituting the 30KPA45A for the 30KPA45.

Q: Why is the 30KPA45 listed as obsolete?

A: The 30KPA45 has reached end-of-life status and is no longer in active production. The 30KPA45A represents the current active equivalent, ensuring continued availability and supply chain reliability for new and existing applications.