3KP170A-B Equivalent & Substitute Parts

Part Overview

The 3KP170A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 170V reverse standoff voltage with 275V maximum clamping voltage and 10.9A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of suitable equivalent and substitute parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

3KP170A-B

Littelfuse Inc.In Stock: 7913KP170A-B Datasheet

Current PartRFQ

5KP170A-B

Littelfuse Inc.In Stock: 11975KP170A-B Datasheet

DirectRFQ

3KP170A-TP

Micro Commercial CoIn Stock: 11103KP170A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP170A-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 170V
• Voltage - Clamping (Max) @ Ipp: 275V
• Mounting Type: Through Hole
• Package / Case: Axial configuration
• Operating Temperature Range: -55°C to 175°C (TJ)
• Type: Zener diode, unidirectional

Substitute parts must maintain identical or superior electrical performance within these voltage and thermal specifications. Current-handling capability (Peak Pulse Current) and power dissipation may vary, provided the substitute meets or exceeds the original specification. Package compatibility and through-hole mounting are mandatory for direct board-level replacement.

Parameter Comparison

Engineering Selection Recommendations

5KP170A-B (Littelfuse Inc.) is the primary direct substitute for the obsolete 3KP170A-B. Both components are manufactured by Littelfuse Inc., maintain identical voltage specifications (170V standoff, 275V clamping), and share the same P600 axial package. The 5KP170A-B offers enhanced current handling (18.5A versus 10.9A) and increased power dissipation (5000W versus 3000W), providing superior transient protection capability. The 5KP170A-B carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

3KP170A-TP (Micro Commercial Co) provides an alternative substitute with electrical specifications identical to the original 3KP170A-B (10.9A peak pulse current, 3000W power dissipation). This component maintains the same voltage ratings and operating temperature range. The primary distinction is the R-6 axial package versus the original P600 package. The 3KP170A-TP carries Active product status, supporting continued availability. Package compatibility must be verified for board-level integration.

Both substitutes are currently in active production, ensuring supply chain continuity and regulatory compliance for new designs and maintenance applications.

Frequently Asked Questions (FAQ)

Q: Can the 5KP170A-B directly replace the 3KP170A-B without circuit modification?

A: Yes, the 5KP170A-B is a direct electrical substitute. Both components share identical voltage specifications (170V standoff, 275V clamping) and the same P600 axial through-hole package. The 5KP170A-B provides enhanced current and power ratings, making it suitable for direct board-level replacement without design changes.

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

A: Both P600 and R-6 are axial through-hole packages designations for TVS diodes. The 3KP170A-TP uses the R-6 package while the original 3KP170A-B uses P600. Physical dimensions and lead spacing may differ. Verify mechanical compatibility with your PCB layout before substitution.

Q: Why does the 5KP170A-B have higher current and power ratings than the 3KP170A-B?

A: The 5KP170A-B belongs to the 5KP series, which is designed for higher transient energy absorption compared to the 3KP series. The 18.5A peak pulse current and 5000W power dissipation represent enhanced protection capability while maintaining the same voltage clamping characteristics. This makes the 5KP170A-B suitable for applications requiring greater transient suppression.

Q: Are both substitutes RoHS compliant?

A: The 5KP170A-B is ROHS3 compliant. The 3KP170A-TP RoHS status is not specified in the provided data. Verify RoHS compliance requirements with your application specifications before final selection.

Q: What is the product status significance for component selection?

A: The original 3KP170A-B is obsolete, meaning Littelfuse Inc. no longer manufactures or supports this component. Both substitutes (5KP170A-B and 3KP170A-TP) carry Active status, indicating current production, ongoing technical support, and long-term availability for new designs and maintenance applications.