3KP170-B Equivalent & Substitute Parts

Part Overview

The 3KP170-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 170V reverse standoff voltage, 288.75V maximum clamping voltage, and 10.9A peak pulse current capability in a through-hole P600 axial package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Substiute Parts

3KP170-B

Littelfuse Inc.In Stock: 10733KP170-B Datasheet

Current PartRFQ

5KP170A-B

Littelfuse Inc.In Stock: 11975KP170A-B Datasheet

DirectRFQ

15KPA170AE3/TR13

Microchip TechnologyIn Stock: 105115KPA170AE3/TR13 Datasheet

MFR RecommendedRFQ

3KP170A-TP

Micro Commercial CoIn Stock: 11103KP170A-TP Datasheet

MFR RecommendedRFQ

5KP170A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 81915KP170A-E3/54 Datasheet

MFR RecommendedRFQ

5KP170A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 8195KP170A-E3/73 Datasheet

MFR RecommendedRFQ

5KP170AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 8695KP170AHE3/54 Datasheet

MFR RecommendedRFQ

5KP170AHE3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 9265KP170AHE3/73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP170-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: Must be 170V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable range (275V–288.75V)
• Current - Peak Pulse (10/1000µs): Must support minimum 10.9A
• Power - Peak Pulse: Must support minimum 3000W
• Operating Temperature Range: Must support -55°C ~ 175°C
• Mounting Type: Through Hole
• Package / Case: P600 or R-6 axial packages
• Type: Zener, unidirectional

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (Same Power Rating) Parts with 3kW peak pulse power and 10.9A peak pulse current, maintaining identical electrical performance.

Category 2: Enhanced Performance Substitutes (Higher Power Rating) Parts with 5kW or 15kW peak pulse power, providing superior transient suppression capability while maintaining voltage compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance): The 3KP170A-TP from Micro Commercial Co is the closest direct equivalent, maintaining identical 10.9A peak pulse current and 3000W power rating. This part is active and suitable for applications requiring the same transient suppression characteristics as the obsolete 3KP170-B. Note that the package designation differs (R-6 versus P600), but both are through-hole axial configurations with compatible footprints.

For Enhanced Protection (Higher Power Rating): The 5KP170A-B from Littelfuse Inc. and the 5KP170A-E3/54, 5KP170A-E3/73 variants from Vishay provide 5000W peak pulse power with 18.2–18.5A peak pulse current. These parts maintain the same 170V reverse standoff voltage and P600 package, offering superior transient suppression capability for applications requiring increased margin.

For Maximum Protection (Highest Power Rating): The 15KPA170AE3/TR13 from Microchip Technology delivers 15000W peak pulse power with 55.4A peak pulse current, maintaining 170V reverse standoff voltage and P600 package compatibility. This part is suitable for high-energy transient environments.

Automotive-Grade Options: The 5KP170AHE3/54 and 5KP170AHE3/73 from Vishay are AEC-Q101 qualified automotive-grade variants, providing the same electrical performance as standard 5KP170A parts with automotive reliability certification.

All substitute parts are RoHS3 compliant and operate across the -55°C ~ 175°C temperature range, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP170A part as a direct replacement for the 3KP170-B? A: Yes, with design consideration. The 5KP170A maintains the same 170V reverse standoff voltage and clamping voltage range (275V), but provides higher peak pulse current (18.5A versus 10.9A) and power rating (5000W versus 3000W). This represents an upgrade in protection capability and is electrically compatible. The P600 package footprint is identical.

Q: What is the difference between 5KP170A-E3/54 and 5KP170A-E3/73? A: Both parts are electrically identical Vishay TransZorb® diodes with 170V reverse standoff, 275V clamping voltage, and 18.2A peak pulse current. The suffix designations (54 and 73) indicate different packaging or tape configurations. Selection depends on your procurement and assembly requirements.

Q: Are the automotive-grade variants (5KP170AHE3/54, 5KP170AHE3/73) suitable for non-automotive applications? A: Yes. These AEC-Q101 qualified parts meet automotive reliability standards and are fully compatible with general-purpose applications. They provide the same electrical performance as standard variants with additional qualification documentation.

Q: Why does the 3KP170A-TP use an R-6 package instead of P600? A: Both R-6 and P600 are through-hole axial package designations for similar form factors. The R-6 package is functionally equivalent for PCB mounting and provides the same electrical performance. Verify footprint compatibility with your PCB design before selection.

Q: Can I use the 15KPA170AE3/TR13 in place of the 3KP170-B? A: Yes. The 15KPA170AE3/TR13 maintains the same 170V reverse standoff voltage and P600 package, but provides significantly higher peak pulse current (55.4A) and power rating (15000W). This represents a substantial upgrade suitable for high-energy transient protection applications. Verify that your circuit design can accommodate the enhanced performance characteristics.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant and meet the same environmental standards as the original 3KP170-B.