3KP26CA-B Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 3KP26CA-B is a through-hole Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage 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. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

3KP26CA-B

Littelfuse Inc.In Stock: 7533KP26CA-B Datasheet

Current PartRFQ

5KP26CA-B

Littelfuse Inc.In Stock: 9385KP26CA-B Datasheet

DirectRFQ

3KP26CA-TP

Micro Commercial CoIn Stock: 8993KP26CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP26CA-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: 26V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 42.1V (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: P600 or R-6 Axial (compatible geometries)
• Operating Temperature Range: -55°C to 175°C (exact match required)
• Type: Zener (exact match required)
• Bidirectional Channels: 1 (exact match required)

Substitute parts must maintain identical voltage specifications and thermal operating range. Peak pulse current and power ratings may vary based on the series designation, provided the clamping voltage and standoff voltage remain constant. Package variations (P600 vs. R-6) are acceptable when mechanical fit permits.

Parameter Comparison

Engineering Selection Recommendations

5KP26CA-B (Littelfuse Inc.): This part is the direct manufacturer equivalent with active product status. It maintains identical voltage specifications and thermal operating range as the 3KP26CA-B. The 5KP26CA-B offers increased peak pulse current (121.1A vs. 71.3A) and power dissipation (5000W vs. 3000W), providing enhanced transient protection capability within the same package footprint. ROHS3 compliance and MSL 1 rating are confirmed. This substitute is suitable for direct replacement in applications where the original 3KP26CA-B is specified.

3KP26CA-TP (Micro Commercial Co): This part is a manufacturer-recommended equivalent supplied by Micro Commercial Co with active product status. It maintains identical voltage specifications, peak pulse current (71.3A), and power dissipation (3000W) as the original 3KP26CA-B. The package variant (R-6 vs. P600) requires verification of mechanical fit within the PCB layout. REACH compliance is confirmed; RoHS status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the 5KP26CA-B be used as a direct replacement for the 3KP26CA-B?

A: Yes. Both parts maintain identical voltage specifications (26V standoff, 42.1V clamping) and operating temperature range (-55°C to 175°C). The 5KP26CA-B provides higher peak pulse current and power dissipation, which is compatible with the original application. Both use the P600 axial package.

Q: What is the difference between the 3KP26CA-B and 3KP26CA-TP?

A: Both parts have identical electrical specifications and peak pulse ratings (71.3A, 3000W). The primary difference is the manufacturer: Littelfuse Inc. versus Micro Commercial Co. The package designation differs (P600 vs. R-6), which may affect PCB layout compatibility. Verify mechanical fit before substitution.

Q: Why is the 3KP26CA-B classified as obsolete?

A: The 3KP26CA-B has reached end-of-life status with Littelfuse Inc. Active alternatives with equivalent or superior electrical performance are available through the same manufacturer (5KP26CA-B) or alternative suppliers (3KP26CA-TP).

Q: Are all substitute parts RoHS compliant?

A: The 5KP26CA-B is confirmed ROHS3 compliant. The 3KP26CA-TP RoHS status is not specified in available technical documentation and should be verified with the supplier before procurement.

Q: Can I use a substitute part with different peak pulse current?

A: The 5KP26CA-B offers higher peak pulse current (121.1A) and power dissipation (5000W) compared to the original 3KP26CA-B (71.3A, 3000W). This provides enhanced protection capability and is suitable for replacement. Lower peak pulse ratings are not acceptable substitutes.

Q: What packaging considerations apply to these substitutes?

A: The 3KP26CA-B and 5KP26CA-B both use P600 axial packaging. The 3KP26CA-TP uses R-6 axial packaging. Both are through-hole components with compatible lead geometries, but PCB layout and hole spacing must be verified for the R-6 variant.