3KP43C Equivalent & Substitute Parts

Part Overview

The 3KP43C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 43V reverse standoff voltage rating and 3kW peak pulse power handling capability in a through-hole P600 axial package. The 3KP43C is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

3KP43C

LittelfuseIn Stock: 11853KP43C Datasheet

Current PartRFQ

5KP43CA

Littelfuse Inc.In Stock: 43425KP43CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP43C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 43V
• Package / Case: P600, Axial (through-hole configuration)
• Bidirectional Channels: 1
• Type: Zener TVS Diode

Secondary Compatibility Factors:

• Operating Temperature Range: -55°C ~ 175°C (TJ)
• RoHS Compliance: ROHS3 Compliant
• Mounting Type: Through Hole

The 5KP43CA qualifies as a direct substitute based on matching reverse standoff voltage (43V), identical package type (P600 axial), and compatible operating temperature range. While the 5KP43CA exhibits higher peak pulse power (5kW versus 3kW) and increased peak pulse current (74.6A versus 43.2A), these represent enhanced performance characteristics that maintain backward compatibility in applications designed for the 3KP43C.

Parameter Comparison

Engineering Selection Recommendations

The 5KP43CA is the qualified substitute for the obsolete 3KP43C based on the following engineering criteria:

Product Status Alignment: The 5KP43CA maintains active product status with Littelfuse, ensuring ongoing availability and manufacturing support. This addresses the primary limitation of the 3KP43C, which is classified as obsolete.

Electrical Compatibility: Both devices share identical reverse standoff voltage (43V) and operating temperature range (-55°C ~ 175°C). The 5KP43CA provides enhanced performance margins with higher peak pulse power (5kW) and peak pulse current (74.6A), making it suitable for applications originally designed around the 3KP43C specifications.

Compliance Certification: Both parts maintain ROHS3 compliance, ensuring regulatory alignment for applications subject to hazardous substance restrictions.

Mechanical Compatibility: Identical P600 axial through-hole package configuration enables direct physical substitution without circuit board redesign or layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 5KP43CA directly replace the 3KP43C in existing designs?

A: Yes. The 5KP43CA matches the critical substitution parameters: 43V reverse standoff voltage, P600 axial through-hole package, and identical operating temperature range. The higher power rating (5kW versus 3kW) represents enhanced performance that maintains backward compatibility.

Q: What is the primary reason for substituting the 3KP43C?

A: The 3KP43C is classified as obsolete. The 5KP43CA provides an active, currently manufactured alternative from the same manufacturer with equivalent electrical specifications for the voltage protection function.

Q: Are there any electrical parameter differences that affect circuit performance?

A: The 5KP43CA exhibits a slightly higher minimum breakdown voltage (47.8V versus 45.27V) and lower maximum clamping voltage (69.4V versus 72.87V). These variations remain within acceptable tolerance ranges for general-purpose transient voltage suppression applications and represent improved clamping characteristics.

Q: Is the package footprint identical between these parts?

A: Yes. Both the 3KP43C and 5KP43CA use the P600 axial through-hole package, enabling direct physical substitution without printed circuit board modifications.

Q: What compliance certifications apply to the 5KP43CA?

A: The 5KP43CA is ROHS3 compliant and REACH unaffected, meeting regulatory requirements for hazardous substance restrictions in electronic components.