Littelfuse 3KP11 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP11 is a unidirectional Zener transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. Featuring an 11V reverse standoff voltage and 3kW peak pulse power rating, this through-hole component operates across the industrial temperature range of -55°C to 175°C.

The 3KP11 is classified as obsolete. Identifying qualified substitute parts ensures design continuity and maintains supply chain reliability for applications requiring equivalent transient suppression performance.

Substiute Parts

3KP11

Littelfuse Inc.In Stock: 10613KP11 Datasheet

Current PartRFQ

5KP11A

Littelfuse Inc.In Stock: 37495KP11A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP11 are qualified based on the following critical parameters that determine functional equivalence:

• Voltage Class: Reverse standoff voltage of 11V (±tolerance range)
• Diode Type: Unidirectional Zener TVS configuration
• Package Compatibility: P600 axial through-hole form factor
• Operating Temperature: -55°C to 175°C range
• Regulatory Compliance: ROHS3 compliance maintained

The 5KP11A qualifies as a direct substitute because it maintains identical voltage classification, unidirectional topology, P600 package geometry, and temperature operating range. The substitute exhibits enhanced electrical performance characteristics while preserving mechanical and thermal compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 5KP11A is the qualified substitute for the obsolete 3KP11. Both components maintain identical voltage classification (11V reverse standoff), unidirectional Zener topology, P600 axial through-hole packaging, and -55°C to 175°C operating temperature range. Both achieve ROHS3 compliance.

The 5KP11A carries active product status, ensuring ongoing availability and supply chain support. The substitute provides enhanced electrical performance with higher peak pulse current (280.2A versus 164.8A) and increased peak pulse power rating (5kW versus 3kW), delivering superior transient suppression capability within the same mechanical and thermal envelope.

Frequently Asked Questions (FAQ)

Q: Can the 5KP11A directly replace the 3KP11 in existing designs?

A: Yes. Both components share identical voltage classification (11V), unidirectional Zener configuration, P600 axial through-hole package, and operating temperature range (-55°C to 175°C). Mechanical and electrical compatibility is maintained.

Q: What are the key differences between these parts?

A: The 5KP11A provides enhanced performance with higher peak pulse current (280.2A) and increased power dissipation capability (5kW) compared to the 3KP11 (164.8A, 3kW). Clamping voltage is slightly lower (18.2V versus 19.11V). Both maintain the same voltage class and package form factor.

Q: Why is the 3KP11 obsolete?

A: The 3KP11 has reached end-of-life status. The 5KP11A represents the current-generation equivalent from Littelfuse, offering improved specifications and active product support.

Q: Are there any thermal or mounting considerations when substituting?

A: No. Both components operate across -55°C to 175°C and use identical P600 axial through-hole mounting. Thermal and mechanical installation requirements remain unchanged.

Q: Does the substitute maintain regulatory compliance?

A: Yes. The 5KP11A is ROHS3 compliant, matching the compliance status of the original 3KP11.