5KP85 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP85 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features an 85V reverse standoff voltage rating and 5000W peak pulse power handling capability in a through-hole P600 axial package. The 5KP85 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

5KP85

Littelfuse Inc.In Stock: 8235KP85 Datasheet

Current PartRFQ

5KP85A

Diotec SemiconductorIn Stock: 44055KP85A Datasheet

DirectRFQ

5KP85E3/TR13

Microchip TechnologyIn Stock: 9135KP85E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5KP85 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 85V to maintain circuit protection thresholds
• Power - Peak Pulse: Must be 5000W (5kW) to handle transient energy without degradation
• Package / Case: Must be P600, Axial for mechanical and electrical compatibility
• Type: Must be Zener unidirectional TVS diode
• Unidirectional Channels: Must be 1 channel
• RoHS Compliance: Must meet ROHS3 requirements for regulatory compliance

The substitute parts identified below meet all these core criteria while maintaining functional equivalence. Secondary parameters such as voltage breakdown minimum, clamping voltage, and peak pulse current may vary within acceptable engineering tolerances for the application category.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products from established manufacturers and meet all mandatory substitution criteria. Selection between 5KP85A and 5KP85E3/TR13 should be based on the following factors:

5KP85A (Diotec Semiconductor): This part offers the lowest clamping voltage at 137V and the highest peak pulse current at 36A. It is suitable for applications requiring aggressive transient suppression with lower clamping characteristics. The operating temperature range extends to -50°C minimum, which is acceptable for most industrial applications. REACH status information is available upon request.

5KP85E3/TR13 (Microchip Technology): This part maintains the full operating temperature range of -55°C to 175°C, matching the original 5KP85 specification. The clamping voltage is 151V with a peak pulse current of 33.1A. This part is designated as REACH Unaffected, providing regulatory clarity for supply chain compliance. The extended low-temperature rating makes this option preferable for applications requiring full -55°C operation.

Both parts are ROHS3 compliant and rated for 5000W peak pulse power, ensuring functional equivalence in transient protection circuits.

Frequently Asked Questions (FAQ)

Q: Can 5KP85A and 5KP85E3/TR13 be used interchangeably with the original 5KP85?

A: Both substitute parts meet the core substitution criteria: 85V reverse standoff voltage, 5000W peak pulse power rating, P600 axial package, and ROHS3 compliance. They are functionally equivalent for general-purpose transient voltage suppression applications. Differences in clamping voltage and peak pulse current are within acceptable tolerances for the TVS diode category.

Q: What is the significance of the voltage clamping difference between the three parts?

A: The clamping voltage determines the maximum voltage the TVS diode will allow across the protected circuit during a transient event. The 5KP85 clamps at 143.85V, the 5KP85A at 137V, and the 5KP85E3/TR13 at 151V. Selection depends on the specific circuit protection requirements. Lower clamping voltage provides more aggressive protection but may increase component stress.

Q: Does the operating temperature range difference affect substitution?

A: The 5KP85A operates from -50°C to 175°C, while both the original 5KP85 and 5KP85E3/TR13 operate from -55°C to 175°C. For applications requiring operation below -50°C, the 5KP85E3/TR13 is the appropriate choice. For applications with minimum operating temperatures above -50°C, either substitute is acceptable.

Q: Are all three parts RoHS compliant?

A: Yes, all three parts are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What does the P600 package designation mean?

A: P600 is a through-hole axial package format for discrete diodes. All three parts use this identical package, ensuring mechanical and electrical compatibility in existing PCB designs without layout modifications.