Equivalent & Substitute Parts for 5KP85-B TVS Diode

Part Overview

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

Substiute Parts

5KP85-B

LittelfuseIn Stock: 9445KP85-B Datasheet

Current PartRFQ

5KP85A

Diotec SemiconductorIn Stock: 44055KP85A Datasheet

DirectRFQ

5KP85A-B

Littelfuse Inc.In Stock: 10235KP85A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP85-B is determined by strict alignment of the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 85V
• Voltage - Breakdown (Min): within acceptable tolerance range
• Power - Peak Pulse: 5000W (5kW)
• Mounting Type: Through Hole
• Package / Case: P600, Axial
• Unidirectional Channels: 1
• Type: Zener
• RoHS Compliance: ROHS3 Compliant

The substitute parts identified below meet these core criteria and are classified as active products, providing viable alternatives for new designs and replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The 5KP85A-B (Littelfuse Inc.) is the primary substitute for the obsolete 5KP85-B. Both components are manufactured by Littelfuse, share identical reverse standoff voltage ratings, equivalent power handling, and matching thermal operating ranges. The 5KP85A-B maintains the same MSL classification and RoHS3 compliance status. This part is currently active with confirmed inventory availability.

The 5KP85A (Diotec Semiconductor) serves as a secondary substitute option. It meets all core electrical and mechanical substitution criteria, including the 85V reverse standoff voltage, 5000W peak pulse power rating, and P600 axial through-hole package. The Diotec variant operates across a slightly narrower lower temperature range (-50°C minimum versus -55°C) and carries different MSL classification. This part is active with substantial inventory availability.

Both substitute parts demonstrate lower clamping voltages (137V) compared to the original 5KP85-B (143.85V), which represents improved transient suppression performance within the same voltage class and power rating.

Frequently Asked Questions (FAQ)

Q: Can the 5KP85A-B directly replace the 5KP85-B in existing designs?

A: Yes. The 5KP85A-B is a direct substitute. Both parts share the same 85V reverse standoff voltage, 5000W peak pulse power rating, P600 axial through-hole package, and operating temperature range. The 5KP85A-B is manufactured by the same supplier (Littelfuse) and maintains equivalent RoHS3 compliance and MSL classification.

Q: What is the difference between the Littelfuse 5KP85A-B and the Diotec 5KP85A?

A: Both parts meet the core substitution criteria for the 5KP85-B. The primary differences are manufacturer origin and operating temperature range. The Littelfuse 5KP85A-B operates from -55°C to 175°C, while the Diotec 5KP85A operates from -50°C to 175°C. For applications requiring the full -55°C lower temperature specification, the Littelfuse variant is preferred.

Q: Are there any electrical performance differences between these substitutes?

A: The substitute parts exhibit lower maximum clamping voltages (137V) compared to the original 5KP85-B (143.85V), while maintaining the same 85V reverse standoff voltage and 5000W power rating. This represents improved transient suppression performance within the same voltage class.

Q: Is the P600 axial package compatible with existing PCB layouts designed for the 5KP85-B?

A: Yes. All identified substitutes use the P600 axial through-hole package, ensuring mechanical and footprint compatibility with designs originally specified for the 5KP85-B.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the 5KP85A-B and 5KP85A are ROHS3 compliant, matching the compliance status of the original 5KP85-B.