3KP170C-B Equivalent & Substitute Parts

Part Overview

The 3KP170C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 170V reverse standoff voltage with a 288.75V maximum clamping voltage and 10.9A peak pulse current capability in a P600 axial through-hole package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

3KP170C-B

Littelfuse Inc.In Stock: 8463KP170C-B Datasheet

Current PartRFQ

5KP170CA-B

Littelfuse Inc.In Stock: 9325KP170CA-B Datasheet

DirectRFQ

15KP170CA-TP

Micro Commercial CoIn Stock: 98315KP170CA-TP Datasheet

MFR RecommendedRFQ

15KPA170CAE3/TR13

Microchip TechnologyIn Stock: 113315KPA170CAE3/TR13 Datasheet

MFR RecommendedRFQ

30KP170CA-TP

Micro Commercial CoIn Stock: 102430KP170CA-TP Datasheet

MFR RecommendedRFQ

3KP170CA-TP

Micro Commercial CoIn Stock: 7653KP170CA-TP Datasheet

MFR RecommendedRFQ

AK10-170C-BP

Micro Commercial CoIn Stock: 727AK10-170C-BP Datasheet

MFR RecommendedRFQ

AK6-170C-BP

Micro Commercial CoIn Stock: 1191AK6-170C-BP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP170C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 170V (all substitutes maintain this specification)
• Voltage - Clamping (Max) @ Ipp: Range 260V–288.75V (acceptable variance for general-purpose protection)
• Current - Peak Pulse (10/1000µs): Minimum 10.9A (substitutes may exceed this rating)
• Power - Peak Pulse: Minimum 3000W (substitutes may exceed this rating)
• Operating Temperature: -55°C ~ 175°C (all substitutes meet or exceed this range)
• Mounting Type: Through Hole (all substitutes are through-hole mounted)
• Package Compatibility: P600 or R-6 axial packages (both are standard axial through-hole formats)
• RoHS Compliance: ROHS3 Compliant (all substitutes maintain compliance)

Substitutes are grouped by power rating capability and package format. Higher power-rated devices (5kW, 15kW, 30kW) provide enhanced transient suppression capacity while maintaining the same voltage protection threshold. Package variants (P600 vs. R-6) are mechanically compatible in standard through-hole PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Same Power Rating):

• 3KP170CA-TP (Micro Commercial Co) provides the closest functional equivalent with identical 3kW power rating and 10.9A peak pulse current. This part is active and available in R-6 axial package format, suitable for direct substitution in standard through-hole PCB layouts.

Enhanced Protection (Higher Power Ratings):

• 5KP170CA-B (Littelfuse Inc., 5kW) offers increased transient suppression capacity with 18.5A peak pulse current while maintaining the same voltage protection threshold. Recommended for applications requiring higher energy absorption.
• 15KPA170CAE3/TR13 (Microchip Technology, 15kW) and 15KP170CA-TP (Micro Commercial Co, 15kW) provide substantial protection enhancement with significantly higher power dissipation capability.
• 30KP170CA-TP (Micro Commercial Co, 30kW) delivers maximum protection capacity for demanding transient suppression requirements.

High-Current Applications:

• AK10-170C-BP and AK6-170C-BP (Micro Commercial Co) feature specialized right-angle bend packages with extremely high peak pulse current ratings (10kA and 6kA respectively using 8/20µs pulse definition). These are suitable for high-energy transient environments but operate at a reduced maximum temperature of -55°C ~ 150°C.

All substitute parts maintain ROHS3 compliance and 170V reverse standoff voltage specification. Selection should be based on application power dissipation requirements and available PCB space for package format accommodation.

Frequently Asked Questions (FAQ)

Q: Can I use a higher power-rated TVS diode as a substitute for the 3KP170C-B? A: Yes. Higher power-rated substitutes (5kW, 15kW, 30kW) maintain the same 170V reverse standoff voltage and provide enhanced transient suppression capacity. They are electrically compatible and offer improved protection margins in applications subject to higher energy transients.

Q: What is the difference between P600 and R-6 package formats? A: Both P600 and R-6 are standard axial through-hole packages suitable for PCB mounting. P600 and R-6 are mechanically compatible in typical through-hole layouts. Package selection depends on available PCB footprint space and lead spacing requirements.

Q: Are the AK-series parts (AK10-170C-BP, AK6-170C-BP) compatible with the 3KP170C-B? A: The AK-series parts maintain the same 170V reverse standoff voltage but feature a specialized right-angle bend package (24.15mm center) and operate at a reduced maximum temperature of -55°C ~ 150°C compared to the standard -55°C ~ 175°C range. They are suitable for high-current transient environments but require PCB layout accommodation for the bent lead configuration.

Q: Why does the 3KP170C-B show as obsolete? A: The 3KP170C-B is no longer manufactured by Littelfuse Inc. Active equivalent parts from multiple manufacturers (Micro Commercial Co, Microchip Technology) are available as direct or enhanced substitutes for ongoing design support and procurement.

Q: What parameters must remain constant when selecting a substitute? A: The 170V reverse standoff voltage must be maintained. Operating temperature range, RoHS compliance, and through-hole mounting type should be verified for application compatibility. Clamping voltage and power dissipation may be equal to or exceed the original specification.

Q: Can I substitute a part with lower peak pulse current rating? A: No. Substitute parts must maintain or exceed the 10.9A peak pulse current specification to ensure adequate transient suppression performance.