3KP170C Equivalent & Substitute Parts

Part Overview

The 3KP170C is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage transient 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 3KP170C is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure continued availability for new production builds and field replacements.

Substiute Parts

3KP170C

Littelfuse Inc.In Stock: 9753KP170C Datasheet

Current PartRFQ

5KP170CA

Littelfuse Inc.In Stock: 24675KP170CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP170C is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must match at 170V to maintain circuit protection threshold
• Package / Case: Must be P600 axial through-hole for mechanical and electrical compatibility
• Bidirectional Channels: Must be 1 channel to match the original design
• Operating Temperature Range: Must support -55°C ~ 175°C (TJ) minimum
• RoHS Compliance: Must maintain ROHS3 compliance for regulatory continuity

The 5KP170CA meets all substitution criteria. While it exhibits higher peak pulse current (18.5A vs. 10.9A) and peak pulse power (5000W vs. 3000W), these represent enhanced performance characteristics that do not compromise compatibility. The clamping voltage differential (275V vs. 288.75V) remains within acceptable tolerance for general-purpose transient suppression applications where the standoff voltage is the primary design constraint.

Parameter Comparison

Engineering Selection Recommendations

The 5KP170CA is the qualified substitute for the obsolete 3KP170C. Selection is based on the following engineering criteria:

Product Status: The 5KP170CA maintains active product status with Littelfuse Inc., ensuring continued availability and manufacturing support. The 3KP170C obsolescence status necessitates transition to an active alternative.

Regulatory Compliance: Both components maintain ROHS3 compliance, satisfying environmental and regulatory requirements for new designs and field replacements.

Electrical Compatibility: The 5KP170CA preserves the critical 170V reverse standoff voltage specification, maintaining the circuit protection threshold. Enhanced current and power ratings provide additional margin without introducing incompatibility.

Mechanical Compatibility: Identical P600 axial through-hole packaging ensures direct board-level substitution without layout modifications or mechanical redesign.

Frequently Asked Questions (FAQ)

Q: Can the 5KP170CA be used as a direct replacement for the 3KP170C?

A: Yes. The 5KP170CA is electrically and mechanically compatible. Both components share identical reverse standoff voltage (170V), package type (P600 axial), and operating temperature range (-55°C ~ 175°C). The substitute provides enhanced current and power handling without compromising circuit protection function.

Q: Why does the 5KP170CA have higher peak pulse current and power ratings?

A: The 5KP170CA is part of the 5KP series, which is designed for higher transient energy absorption. The increased ratings (18.5A vs. 10.9A, 5000W vs. 3000W) represent enhanced performance characteristics. These higher ratings do not create incompatibility; they provide additional protection margin in the same package footprint.

Q: Are there any differences in clamping voltage between the two parts?

A: The 5KP170CA exhibits a lower maximum clamping voltage (275V vs. 288.75V). This represents improved clamping performance and does not compromise circuit compatibility for general-purpose transient suppression applications where the 170V standoff voltage is the primary design parameter.

Q: Is the 5KP170CA available in the same packaging format?

A: Yes. Both the 3KP170C and 5KP170CA use the P600 axial through-hole package. The 5KP170CA is supplied in Cut Tape (CT) packaging, which is standard for active production components and compatible with automated assembly processes.

Q: Do both components meet the same regulatory standards?

A: Yes. Both the 3KP170C and 5KP170CA are ROHS3 compliant. The 5KP170CA additionally carries REACH Unaffected status, confirming compliance with current environmental regulations.