3KP75 Equivalent & Substitute Parts

Part Overview

The 3KP75 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 75V reverse standoff voltage rating with a 127.05V maximum clamping voltage and 24.8A peak pulse current capability in a through-hole P600 axial package. The 3KP75 is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement.

Substiute Parts

3KP75

Littelfuse Inc.In Stock: 10193KP75 Datasheet

Current PartRFQ

5KP75A

Littelfuse Inc.In Stock: 42025KP75A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP75 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating: Reverse standoff voltage of 75V and compatible breakdown voltage range (78.93V minimum)
• Package Compatibility: P600 axial through-hole package for direct mechanical and electrical interchange
• Unidirectional Configuration: Single channel Zener TVS diode topology
• Operating Temperature Range: -55°C to 175°C junction temperature capability
• Compliance: ROHS3 compliance for regulatory alignment

The 5KP75A qualifies as a direct substitute based on matching all critical parameters while offering enhanced performance characteristics in peak pulse power handling.

Parameter Comparison

Engineering Selection Recommendations

The 5KP75A is a qualified substitute for the obsolete 3KP75 based on the following criteria:

• Electrical Compatibility: Both devices maintain the 75V reverse standoff voltage specification. The 5KP75A exhibits a slightly higher minimum breakdown voltage (83.3V vs. 78.93V) and lower maximum clamping voltage (121V vs. 127.05V), both within acceptable tolerance for general-purpose transient suppression applications.

• Mechanical Interchange: Identical P600 axial through-hole package enables direct board-level substitution without layout modifications.

• Regulatory Compliance: Both components are ROHS3 compliant, ensuring regulatory alignment for new designs and legacy system updates.

• Product Status: The 5KP75A is active in production, providing long-term availability and supply chain stability compared to the obsolete 3KP75.

• Enhanced Performance: The 5KP75A offers superior peak pulse current (42.1A vs. 24.8A) and peak pulse power (5000W vs. 3000W), providing additional margin for transient suppression in demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the 5KP75A be used as a direct replacement for the 3KP75 in existing designs?

A: Yes. Both devices share identical reverse standoff voltage (75V), operating temperature range (-55°C to 175°C), and P600 axial through-hole package. No circuit modifications or board redesign are required for substitution.

Q: What are the key electrical differences between the 3KP75 and 5KP75A?

A: The primary differences are peak pulse current (42.1A vs. 24.8A) and peak pulse power (5000W vs. 3000W). The 5KP75A provides enhanced transient suppression capability. The clamping voltage is slightly lower (121V vs. 127.05V), which is beneficial for circuit protection.

Q: Are there any compliance or certification differences?

A: Both components are ROHS3 compliant. The 5KP75A includes REACH Unaffected status, providing additional regulatory documentation for international applications.

Q: Why is the 3KP75 obsolete?

A: The 3KP75 has been discontinued by Littelfuse Inc. The 5KP75A represents the current production alternative with equivalent electrical specifications and enhanced performance characteristics.

Q: Does the package change affect PCB assembly?

A: No. Both components use the identical P600 axial through-hole package. Existing PCB designs, footprints, and assembly processes require no modification.