3KP26 Equivalent & Substitute Parts

Part Overview

The 3KP26 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 26V reverse standoff voltage with a 44.21V maximum clamping voltage and 71.3A peak pulse current capability in a P600 axial through-hole package. The 3KP26 is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement.

Substiute Parts

3KP26

Littelfuse Inc.In Stock: 10173KP26 Datasheet

Current PartRFQ

5KP26A

Littelfuse Inc.In Stock: 46525KP26A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP26 is determined by the following critical electrical and mechanical parameters:

Voltage Parameters: The reverse standoff voltage (26V typical) and breakdown voltage range (27.36V minimum) define the voltage class. Substitute parts must maintain the same 26V standoff specification to ensure proper circuit protection thresholds.

Current and Power Handling: The peak pulse current (71.3A) and peak pulse power (3000W) establish the transient energy absorption capability. Substitute parts may exceed these ratings without compromising compatibility, as higher ratings provide equivalent or superior protection.

Package and Mounting: The P600 axial through-hole package is a mechanical requirement for board-level integration. Substitute parts must use identical packaging to ensure direct replacement without PCB redesign.

Temperature Range: The operating temperature range (-55°C ~ 175°C) must be maintained or exceeded in substitute parts to ensure reliability across the intended application environment.

Compliance: RoHS3 compliance is mandatory for regulatory adherence in the target market.

Parameter Comparison

Engineering Selection Recommendations

The 5KP26A is a direct substitute for the 3KP26. Both components share identical voltage specifications (26V reverse standoff), identical package geometry (P600 axial), and identical operating temperature range (-55°C ~ 175°C). The 5KP26A maintains full RoHS3 compliance and is currently in active production status, ensuring long-term availability and supply chain continuity.

The 5KP26A provides enhanced transient protection capability with 121.1A peak pulse current and 5000W peak pulse power, compared to the 3KP26's 71.3A and 3000W ratings. This increased energy absorption capacity is compatible with the original circuit design, as the substitute part meets or exceeds all electrical requirements of the obsolete component.

Frequently Asked Questions (FAQ)

Q: Can the 5KP26A directly replace the 3KP26 without circuit modifications?

A: Yes. The 5KP26A maintains identical voltage specifications, package geometry, and operating temperature range. Direct board-level substitution is possible without design changes.

Q: Why does the 5KP26A have higher peak pulse current and power ratings?

A: The 5KP26A is engineered for enhanced transient protection. Higher ratings do not compromise compatibility; they provide equivalent or superior performance in the same circuit application.

Q: Are there any compliance differences between the 3KP26 and 5KP26A?

A: Both components are RoHS3 compliant. The 5KP26A is currently in active production, ensuring regulatory compliance and supply chain support.

Q: What is the significance of the P600 package specification?

A: The P600 axial package is a mechanical standard for through-hole mounting. Both the 3KP26 and 5KP26A use this identical package, enabling direct PCB-level replacement without layout modifications.

Q: Does the voltage clamping difference (44.21V vs. 42.1V) affect circuit compatibility?

A: No. The 5KP26A's lower clamping voltage (42.1V) provides improved transient suppression performance while maintaining the same 26V standoff voltage. This is a beneficial characteristic for circuit protection.