3KP26A-B Equivalent & Substitute Parts

Part Overview

The 3KP26A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 71.3A peak pulse current capability in a through-hole P600 axial package. The product is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement.

Substiute Parts

3KP26A-B

Littelfuse Inc.In Stock: 12203KP26A-B Datasheet

Current PartRFQ

5KP26A-B

Littelfuse Inc.In Stock: 11035KP26A-B Datasheet

DirectRFQ

3KP26A-TP

Micro Commercial CoIn Stock: 10153KP26A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 3KP26A-B are qualified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 26V
• Voltage - Breakdown (Min): 28.9V
• Voltage - Clamping (Max) @ Ipp: 42.1V
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Type: Zener, Unidirectional

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial

Regulatory Compliance:

• RoHS3 Compliant
• MSL: 1 (Unlimited)

Substitutes are grouped into two categories: direct electrical equivalents with identical peak pulse current ratings, and higher-performance alternatives with increased power dissipation capability while maintaining identical voltage parameters.

Parameter Comparison

Engineering Selection Recommendations

5KP26A-B (Littelfuse Inc.): This substitute maintains identical voltage parameters and package form factor (P600 axial) while offering increased peak pulse current (121.1A) and power dissipation (5000W). The component is manufactured by the original equipment manufacturer and carries active product status with ROHS3 compliance. This option is suitable for applications requiring enhanced transient protection margin or where higher energy absorption is beneficial.

3KP26A-TP (Micro Commercial Co): This substitute provides electrical equivalence with identical voltage and current specifications (71.3A, 3000W). The component maintains active product status and uses an R-6 axial package variant. This option is appropriate for direct replacement in existing designs where package footprint compatibility with R-6 axial form factor is acceptable.

Both substitutes maintain the required operating temperature range and unidirectional zener diode topology, ensuring functional compatibility with the obsolete 3KP26A-B.

Frequently Asked Questions (FAQ)

Q: Can the 5KP26A-B be used as a direct replacement for the 3KP26A-B?

A: Yes. The 5KP26A-B maintains identical voltage parameters (26V standoff, 28.9V breakdown, 42.1V clamping) and uses the same P600 axial package. The increased peak pulse current (121.1A vs. 71.3A) and power rating (5000W vs. 3000W) provide enhanced protection capability without compromising compatibility.

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

A: Both are through-hole axial packages for TVS diodes. The P600 is the package used in the original 3KP26A-B and 5KP26A-B. The R-6 is the package variant used in the 3KP26A-TP. Package selection depends on PCB layout and mechanical mounting requirements.

Q: Are all substitutes RoHS3 compliant?

A: The 5KP26A-B is confirmed ROHS3 compliant. The 3KP26A-TP RoHS status is not specified in the provided data. Verify compliance requirements with your procurement or quality assurance department before selection.

Q: Why is the 3KP26A-B marked as obsolete?

A: Product obsolescence is determined by the manufacturer. The 5KP26A-B and 3KP26A-TP are both active products and serve as suitable alternatives for new designs or ongoing support of existing applications.

Q: Can I use the 3KP26A-TP in place of the 5KP26A-B?

A: The 3KP26A-TP and 5KP26A-B have identical voltage and current specifications but differ in package form factor (R-6 vs. P600) and manufacturer. Selection depends on PCB layout compatibility and procurement availability. Both are electrically equivalent for the 3KP26A-B application.