Equivalent & Substitute Parts for 3KP6.5-B TVS Diode

Part Overview

The 3KP6.5-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications. This component features a 6.5V reverse standoff voltage with an 11.76V maximum clamping voltage at peak pulse current of 267.9A. The part is classified as obsolete, necessitating identification of active alternative components that maintain equivalent electrical and mechanical performance characteristics for continued system support and new designs.

Substiute Parts

3KP6.5-B

Littelfuse Inc.In Stock: 6563KP6.5-B Datasheet

Current PartRFQ

5KP6.5A-B

Littelfuse Inc.In Stock: 8275KP6.5A-B Datasheet

DirectRFQ

3KP6.5A-TP

Micro Commercial CoIn Stock: 10503KP6.5A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP6.5-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 6.5V to maintain circuit protection threshold
• Mounting Type: Must be Through Hole to ensure mechanical compatibility
• Unidirectional Channels: Must be 1 channel for equivalent circuit function
• Operating Temperature Range: Must support -55°C to 175°C (TJ) minimum
• Type: Must be Zener for equivalent suppression characteristics

Substitute parts are grouped based on their ability to meet these core requirements while providing equivalent or superior electrical performance in peak pulse current handling and power dissipation capacity.

Parameter Comparison

Engineering Selection Recommendations

5KP6.5A-B (Littelfuse Inc.): This part is the primary substitute for the obsolete 3KP6.5-B. Both components are manufactured by Littelfuse Inc. and share identical reverse standoff voltage, operating temperature range, and mounting configuration. The 5KP6.5A-B offers superior peak pulse current handling (455.4A versus 267.9A) and increased power dissipation capacity (5000W versus 3000W), with a lower maximum clamping voltage (11.2V versus 11.76V). The part maintains ROHS3 compliance and is currently in active production status.

3KP6.5A-TP (Micro Commercial Co): This alternative maintains electrical equivalence with the original 3KP6.5-B in terms of peak pulse current (267.9A) and power dissipation (3000W). The component shares identical reverse standoff voltage and operating temperature specifications. The package designation differs (R-6 versus P600), requiring mechanical verification for board-level compatibility. The part is in active production status. RoHS compliance status is not specified in available documentation.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts maintain the same 6.5V reverse standoff voltage, -55°C to 175°C operating temperature range, and through-hole axial mounting configuration. The 5KP6.5A-B provides equivalent or superior electrical performance with higher peak pulse current capacity and lower clamping voltage.

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 physical form factors. Mechanical compatibility must be verified against the PCB layout and component footprint specifications before selecting the 3KP6.5A-TP.

Q: Are all substitute parts RoHS compliant?

A: The 5KP6.5A-B is ROHS3 compliant. The 3KP6.5A-TP RoHS compliance status is not specified in the provided documentation and should be confirmed with the manufacturer before use in RoHS-regulated applications.

Q: Why does the 5KP6.5A-B have a lower clamping voltage than the original 3KP6.5-B?

A: The 5KP6.5A-B achieves lower clamping voltage (11.2V versus 11.76V) while maintaining the same reverse standoff voltage through improved diode design. This represents enhanced performance characteristics and is suitable for applications requiring tighter voltage regulation.

Q: Can the 3KP6.5A-TP be used in high-current applications?

A: The 3KP6.5A-TP is rated for 267.9A peak pulse current and 3000W power dissipation, matching the original 3KP6.5-B specifications. For applications requiring higher current handling, the 5KP6.5A-B (455.4A, 5000W) is the appropriate selection.