3KP17A-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 3KP17A-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 17V reverse standoff voltage with a 27.6V maximum clamping voltage and 108.7A peak pulse current capability in a through-hole P600 axial package. The 3KP17A-B is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

3KP17A-B

Littelfuse Inc.In Stock: 8803KP17A-B Datasheet

Current PartRFQ

5KP17A-B

LittelfuseIn Stock: 8795KP17A-B Datasheet

DirectRFQ

3KP17A-TP

Micro Commercial CoIn Stock: 9683KP17A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 3KP17A-B must maintain electrical equivalence across the critical parameters that define TVS diode functionality: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current rating. The substitution logic is based strictly on these electrical specifications and package compatibility.

The allowed substitution parameters are:

• Voltage - Reverse Standoff (Typ): 17V
• Voltage - Breakdown (Min): 18.9V
• Voltage - Clamping (Max) @ Ipp: 27.6V
• Current - Peak Pulse (10/1000µs): 108.7A or higher
• Power - Peak Pulse: 3000W or higher
• Package / Case: P600 or R-6 axial through-hole
• Operating Temperature Range: -55°C to 175°C or wider
• Type: Zener, Unidirectional

Substitutes are grouped into two categories: direct equivalents with identical electrical ratings and higher-rated alternatives that provide enhanced performance margins while maintaining the same voltage protection characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 5KP17A-B is a direct substitute manufactured by Littelfuse with active product status. It maintains identical voltage specifications (17V standoff, 18.9V breakdown, 27.6V clamping) and identical package form factor (P600 axial). The 5KP17A-B provides enhanced current handling (184.8A versus 108.7A) and power dissipation (5000W versus 3000W), offering superior performance margins for the same protection voltage. Both components are ROHS3 compliant.

The 3KP17A-TP, manufactured by Micro Commercial Co, is the manufacturer-recommended alternative. It provides electrical equivalence with identical voltage and current ratings (108.7A, 3000W) and active product status. The primary difference is the package form factor: R-6 axial versus P600 axial. Both are through-hole axial packages with compatible footprints for standard PCB layouts. This component maintains the same operating temperature range and offers REACH compliance status.

For applications requiring direct form-factor compatibility with existing designs, the 3KP17A-TP is the preferred selection. For applications where enhanced performance margins are beneficial, the 5KP17A-B provides higher current and power ratings while maintaining identical protection voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 5KP17A-B replace the 3KP17A-B in existing designs?

A: Yes. The 5KP17A-B maintains identical voltage specifications and uses the same P600 axial package. The higher current rating (184.8A versus 108.7A) and power dissipation (5000W versus 3000W) are compatible with applications designed for the 3KP17A-B, as they provide additional performance margin without changing the protection voltage threshold.

Q: What is the difference between P600 and R-6 packages?

A: Both P600 and R-6 are through-hole axial package designations for TVS diodes. The R-6 package used by the 3KP17A-TP is mechanically compatible with standard PCB layouts designed for axial components. Package selection depends on specific PCB footprint requirements and mechanical constraints.

Q: Are all substitute parts RoHS compliant?

A: The 5KP17A-B and 3KP17A-B are both ROHS3 compliant. The 3KP17A-TP RoHS status is not specified in the provided data. Verify RoHS compliance requirements with the component supplier if this is a design requirement.

Q: Can I use the 3KP17A-TP as a direct replacement for the 3KP17A-B?

A: Yes. The 3KP17A-TP provides electrical equivalence with identical voltage ratings (17V standoff, 18.9V breakdown, 27.6V clamping) and current handling (108.7A). The package form factor differs (R-6 versus P600), but both are compatible through-hole axial packages. Verify PCB footprint compatibility before implementation.

Q: Why does the 5KP17A-B have higher current and power ratings?

A: The 5KP17A-B belongs to the 5KP series, which is designed for higher transient energy absorption compared to the 3KP series. Both maintain the same voltage protection characteristics, but the 5KP series provides enhanced current handling and power dissipation capability for applications requiring greater transient protection margin.