3KP6.5CA-B Equivalent & Substitute Parts

Part Overview

The 3KP6.5CA-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in through-hole applications. This component features a 6.5V reverse standoff voltage with an 11.2V maximum clamping voltage and peak pulse current handling of 267.9A at 3000W peak pulse power. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and component procurement.

Substiute Parts

3KP6.5CA-B

Littelfuse Inc.In Stock: 7373KP6.5CA-B Datasheet

Current PartRFQ

5KP6.5CA-B

Littelfuse Inc.In Stock: 10635KP6.5CA-B Datasheet

DirectRFQ

3KP6.5CA-TP

Micro Commercial CoIn Stock: 7053KP6.5CA-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP6.5CA-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 6.5V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 11.2V (exact match required)
• Current - Peak Pulse (10/1000µs): minimum 267.9A
• Operating Temperature Range: -55°C to 175°C minimum
• Mounting Type: Through Hole
• Type: Zener, Bidirectional, single channel

The identified substitute parts maintain these core electrical specifications while offering either equivalent or enhanced performance characteristics. Package variations (P600 vs. R-6) are acceptable provided mechanical fit and lead configuration are compatible with the application circuit board layout.

Parameter Comparison

Engineering Selection Recommendations

5KP6.5CA-B is the primary substitute for the obsolete 3KP6.5CA-B. This part is manufactured by Littelfuse Inc. (original manufacturer), maintains active product status, and provides identical voltage specifications with enhanced current handling (455.4A vs. 267.9A) and power dissipation (5000W vs. 3000W). The 5KP6.5CA-B retains ROHS3 compliance and the same P600 axial package, ensuring direct mechanical and electrical compatibility. This part is recommended for new designs and ongoing production support.

3KP6.5CA-TP is an alternative substitute manufactured by Micro Commercial Co. This part matches the electrical specifications of the original 3KP6.5CA-B exactly, including current and power ratings. The primary difference is the package variant (R-6 vs. P600 axial). This substitute is suitable only when the R-6 package footprint is compatible with the application circuit board. The 3KP6.5CA-TP is active and available for procurement.

Frequently Asked Questions (FAQ)

Q: Can the 5KP6.5CA-B be used as a direct replacement for the 3KP6.5CA-B?

A: Yes. The 5KP6.5CA-B maintains identical voltage specifications (6.5V reverse standoff, 11.2V clamping) and the same P600 axial package. The higher current rating (455.4A) and power dissipation (5000W) provide enhanced transient protection capability without compromising circuit compatibility.

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 differ in physical dimensions and lead spacing. Mechanical compatibility depends on the application's printed circuit board layout and component placement constraints. Verify package dimensions against your circuit board design before selecting the 3KP6.5CA-TP.

Q: Are all substitute parts RoHS compliant?

A: The 5KP6.5CA-B is ROHS3 compliant. The 3KP6.5CA-TP RoHS status is not specified in the available data. Verify RoHS compliance requirements with your procurement or quality assurance department before finalizing component selection.

Q: Why is the 3KP6.5CA-B obsolete?

A: The original part is classified as obsolete by Littelfuse Inc. The 5KP6.5CA-B represents the active product line continuation with equivalent or superior electrical performance.

Q: Can I use a substitute part with higher current rating in my application?

A: Yes, provided the circuit design accommodates the enhanced transient protection. Higher current and power ratings do not create compatibility issues in standard TVS diode applications. Verify that the clamping voltage (11.2V) remains within acceptable limits for your protected circuit.