Equivalent & Substitute Parts for 3KP85 TVS Diode

Part Overview

The 3KP85 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This component features an 85V reverse standoff voltage rating and 3000W peak pulse power handling capability in a through-hole P600 axial package. The 3KP85 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

3KP85

Littelfuse Inc.In Stock: 10353KP85 Datasheet

Current PartRFQ

5KP85A

Diotec SemiconductorIn Stock: 44055KP85A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP85 is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 85V is the primary selection criterion
• Package Compatibility: P600 axial through-hole package ensures mechanical and electrical compatibility
• Unidirectional Configuration: Single-channel TVS diode topology
• Power Handling Capability: Peak pulse power rating must meet or exceed application requirements
• Thermal Range: Operating temperature range must support the intended application environment
• Compliance Standards: RoHS3 compliance for regulatory alignment

The 5KP85A from Diotec Semiconductor meets all substitution criteria with enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 5KP85A is a direct substitute for the obsolete 3KP85. Both components share identical reverse standoff voltage (85V), unidirectional topology, and P600 axial package configuration. The 5KP85A maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

The 5KP85A demonstrates enhanced electrical performance with higher peak pulse current (36A versus 21.9A) and greater peak pulse power handling (5000W versus 3000W). The clamping voltage is lower (137V versus 143.85V), providing improved transient suppression characteristics. The minimum operating temperature is -50°C compared to -55°C for the 3KP85; this represents a 5°C reduction in the lower temperature bound and should be evaluated against specific application requirements.

Selection of the 5KP85A is appropriate for applications where the original 3KP85 specifications are met or exceeded by the substitute part's electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the 5KP85A directly replace the 3KP85 in existing designs?

A: Yes. Both components share the same 85V reverse standoff voltage, P600 axial through-hole package, and unidirectional TVS diode configuration. No circuit modifications are required for mechanical or electrical compatibility.

Q: What is the significance of the lower clamping voltage in the 5KP85A?

A: The 5KP85A exhibits a clamping voltage of 137V compared to 143.85V in the 3KP85. Lower clamping voltage indicates more effective transient suppression, as the component clamps voltage spikes to a lower level. This represents an improvement in performance for the protected circuit.

Q: Does the 5KP85A support the full temperature range of the 3KP85?

A: The 5KP85A operates from -50°C to 175°C, while the 3KP85 operates from -55°C to 175°C. The 5°C difference at the lower temperature limit should be evaluated against application requirements. If operation below -50°C is required, the 3KP85 specifications must be maintained or an alternative part selected.

Q: Are both components RoHS3 compliant?

A: Yes. Both the 3KP85 and 5KP85A are ROHS3 compliant, meeting current regulatory requirements for hazardous substance restrictions.

Q: Why is the 3KP85 listed as obsolete?

A: The 3KP85 is classified as obsolete by the manufacturer, indicating it is no longer in active production. The 5KP85A represents the active equivalent for ongoing procurement and design support.