3KP170 Equivalent & Substitute Parts

Part Overview

The 3KP170 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 170V reverse standoff voltage rating and 288.75V maximum clamping voltage with 10.9A peak pulse current capability in a through-hole P600 axial package.

The 3KP170 is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure availability for new production runs, repairs, and system upgrades where this protection function remains required.

Substiute Parts

3KP170

Littelfuse Inc.In Stock: 8833KP170 Datasheet

Current PartRFQ

5KP170A

Littelfuse Inc.In Stock: 70425KP170A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP170 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating Match: Reverse standoff voltage of 170V and breakdown voltage range (179.1V minimum) must be maintained to ensure proper circuit protection threshold
• Package Compatibility: P600 axial through-hole package is required for mechanical and electrical compatibility with existing PCB layouts
• Diode Type and Configuration: Unidirectional Zener TVS diode with single channel configuration
• Temperature Operating Range: -55°C to 175°C junction temperature capability
• RoHS3 Compliance: Environmental and regulatory compliance requirement

The 5KP170A qualifies as a direct substitute based on matching all critical parameters while offering enhanced performance characteristics in peak pulse current and power dissipation capacity.

Parameter Comparison

Engineering Selection Recommendations

The 5KP170A is the qualified substitute for the obsolete 3KP170 based on the following engineering criteria:

Electrical Compatibility: Both components maintain the same 170V reverse standoff voltage and P600 axial package configuration, ensuring direct functional replacement in existing circuit designs without PCB modification.

Enhanced Performance: The 5KP170A provides superior peak pulse current (18.5A versus 10.9A) and peak pulse power dissipation (5000W versus 3000W), delivering improved transient protection margin while maintaining lower clamping voltage (275V versus 288.75V).

Regulatory and Compliance Status: Both components are RoHS3 compliant with MSL Level 1 (unlimited moisture sensitivity), meeting current environmental and manufacturing standards. The 5KP170A holds active product status with confirmed availability, eliminating supply chain risk associated with the obsolete 3KP170.

Temperature Performance: Identical operating temperature range (-55°C to 175°C junction temperature) ensures thermal compatibility across all application environments.

Frequently Asked Questions (FAQ)

Q: Can the 5KP170A be used as a direct replacement for the 3KP170 without circuit modification?

A: Yes. Both components share identical reverse standoff voltage (170V), breakdown voltage range, operating temperature limits, and P600 axial through-hole package configuration. No PCB layout or schematic changes are required.

Q: What are the key differences between the 3KP170 and 5KP170A?

A: The primary differences are product status and performance ratings. The 5KP170A is an active product with higher peak pulse current (18.5A versus 10.9A) and power dissipation (5000W versus 3000W), while maintaining lower maximum clamping voltage (275V versus 288.75V). These characteristics provide enhanced transient suppression capability.

Q: Are there any package or mounting considerations when substituting the 5KP170A?

A: No. Both components use identical P600 axial through-hole packaging. Mechanical fit, lead spacing, and PCB hole diameter requirements are identical, allowing direct component substitution without assembly process changes.

Q: Does the 5KP170A meet the same compliance requirements as the 3KP170?

A: Yes. The 5KP170A is RoHS3 compliant with MSL Level 1 rating, matching the compliance profile of the 3KP170. Both components meet current environmental and manufacturing standards.

Q: Why is the 3KP170 classified as obsolete?

A: The 3KP170 has been discontinued by Littelfuse Inc. The 5KP170A represents the current active product offering in this voltage and package category, providing equivalent functionality with enhanced performance characteristics and assured long-term availability.