3KP11A-B Equivalent & Substitute Parts

Part Overview

The 3KP11A-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features an 11V reverse standoff voltage with an 18.2V maximum clamping voltage and 164.8A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

3KP11A-B

Littelfuse Inc.In Stock: 9003KP11A-B Datasheet

Current PartRFQ

5KP11A-B

Littelfuse Inc.In Stock: 10115KP11A-B Datasheet

DirectRFQ

3KP11A-TP

Micro Commercial CoIn Stock: 8913KP11A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 3KP11A-B are identified based on electrical parameter equivalence within the allowed tolerance ranges for TVS diode applications. The critical substitution criteria are:

• Voltage - Reverse Standoff: 11V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 18.2V (exact match required)
• Voltage - Breakdown (Min): 12.2V (exact match required)
• Operating Temperature Range: -55°C to 175°C (exact match required)
• Mounting Type: Through Hole (exact match required)
• Type: Zener, Unidirectional (exact match required)

Substitutes are grouped into two categories: direct manufacturer alternatives and manufacturer-recommended alternatives. Direct alternatives maintain identical electrical specifications and package compatibility. Manufacturer-recommended alternatives provide equivalent electrical performance with package variations that may require mechanical adaptation.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the 3KP11A-B, the 5KP11A-B represents the primary direct substitute. This component maintains identical electrical specifications across all critical voltage parameters while offering increased peak pulse current (280.2A versus 164.8A) and power dissipation capability (5000W versus 3000W). The 5KP11A-B is manufactured by Littelfuse Inc. in the same P600 axial package and carries active product status with ROHS3 compliance.

The 3KP11A-TP, manufactured by Micro Commercial Co, provides electrical equivalence with identical voltage and current specifications to the original 3KP11A-B. This component differs in package designation (R-6 versus P600 axial), which may require mechanical evaluation for board-level compatibility. The 3KP11A-TP maintains active product status and ROHS3 compliance.

Selection between these substitutes depends on application requirements for power dissipation capacity and mechanical package constraints. The 5KP11A-B is suitable for applications requiring enhanced thermal performance. The 3KP11A-TP is appropriate for direct electrical replacement where package form factor compatibility can be verified.

Frequently Asked Questions (FAQ)

Q: Can the 5KP11A-B be used as a direct replacement for the 3KP11A-B?

A: Yes. The 5KP11A-B maintains identical voltage specifications (11V reverse standoff, 12.2V breakdown minimum, 18.2V clamping maximum) and operates within the same temperature range (-55°C to 175°C). Both components use the P600 axial through-hole package. The 5KP11A-B provides higher peak pulse current and power dissipation ratings, making it suitable for the same applications with enhanced margin.

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

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 designations represent different package form factors. Physical dimensions and lead spacing may differ, requiring verification of board-level compatibility before substitution.

Q: Are all three substitute options ROHS3 compliant?

A: Yes. The 5KP11A-B and 3KP11A-TP are both ROHS3 compliant, matching the compliance status of the original 3KP11A-B.

Q: Why is the 3KP11A-B listed as obsolete?

A: Product obsolescence indicates that the component is no longer manufactured or supported by Littelfuse Inc. Active alternatives with equivalent or superior specifications are available.

Q: Can the 3KP11A-TP be used if the P600 package is required?

A: The 3KP11A-TP uses an R-6 package, not P600. Package compatibility must be verified at the board level before substitution. If P600 package form factor is mandatory, the 5KP11A-B is the appropriate choice.