Littelfuse 5KP6.5 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse 5KP6.5 is a unidirectional transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This component features a 6.5V reverse standoff voltage, 11.76V maximum clamping voltage, and 5000W peak pulse power rating in a through-hole P600 axial package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

5KP6.5

Littelfuse Inc.In Stock: 9965KP6.5 Datasheet

Current PartRFQ

5KP6.5A

Littelfuse Inc.In Stock: 26955KP6.5A Datasheet

DirectRFQ

P6KE6.8A

HY Electronic (Cayman) LimitedIn Stock: 20314P6KE6.8A Datasheet

MFR RecommendedRFQ

P6KE6.8A-AP

Micro Commercial CoIn Stock: 872P6KE6.8A-AP Datasheet

MFR RecommendedRFQ

P6KE6.8A-BP

Micro Commercial CoIn Stock: 867P6KE6.8A-BP Datasheet

MFR RecommendedRFQ

P6KE6V8A

Fairchild SemiconductorIn Stock: 19234P6KE6V8A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

• Unidirectional TVS diode topology (1 channel)
• Reverse standoff voltage: 6.5V nominal
• Through-hole axial mounting configuration
• Operating temperature range compatibility: minimum -55°C to 175°C
• RoHS3 compliance

Secondary Compatibility Factors:

• Voltage breakdown minimum within acceptable tolerance of 6.84V
• Clamping voltage performance at rated peak pulse current
• Peak pulse power rating of 5000W or higher
• Package form factor: P600 or DO-15 axial equivalent

The substitute parts listed below meet these criteria with variations in clamping voltage, peak pulse current specifications, and package designations that remain functionally compatible within the application envelope of the original 5KP6.5.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Replacement:

The 5KP6.5A from Littelfuse Inc. is the primary substitute for the obsolete 5KP6.5. Both components share identical reverse standoff voltage (6.5V), matching package designation (P600 axial), and equivalent peak pulse power rating (5000W). The 5KP6.5A maintains the same operating temperature range (-55°C to 175°C) and RoHS3 compliance. This part is currently in active production status with substantial inventory availability (2600 pcs), making it the preferred direct replacement.

Tier 2 - Functional Equivalents:

The P6KE6.8A, P6KE6.8A-AP, P6KE6.8A-BP, and P6KE6V8A represent functional alternatives from alternative manufacturers. These components operate within compatible voltage parameters but exhibit reduced peak pulse power ratings (600W versus 5000W). The P6KE series uses DO-15 axial packaging, which is mechanically compatible with P600 through-hole mounting. All four alternatives maintain RoHS3 compliance and active product status.

The P6KE6.8A-AP and P6KE6.8A-BP variants from Micro Commercial Co extend the operating temperature range to 175°C and carry automotive-grade qualification, providing enhanced thermal performance compared to the standard P6KE6.8A. The P6KE6V8A from Fairchild Semiconductor offers the highest clamping voltage (13.4V) among the alternatives, suitable for applications requiring additional voltage margin.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original 5KP6.5. The 5KP6.5A provides the most direct compliance continuity. Alternative manufacturers' parts carry equivalent regulatory status, with P6KE6.8A-AP and P6KE6.8A-BP offering REACH Unaffected certification.

Frequently Asked Questions (FAQ)

Q: Can the 5KP6.5A directly replace the obsolete 5KP6.5 without circuit modification?

A: Yes. The 5KP6.5A is a direct replacement sharing identical electrical specifications (6.5V reverse standoff, 11.76V clamping voltage, 5000W peak pulse power) and package form factor (P600 axial). No circuit modifications are required.

Q: What is the primary limitation of the P6KE series substitutes compared to the 5KP6.5?

A: The P6KE series components are rated for 600W peak pulse power versus the 5000W rating of the 5KP6.5. This reduced power handling capability restricts their use to lower-energy transient suppression applications. Applications requiring the full 5000W capability must use the 5KP6.5A.

Q: Are P600 and DO-15 packages mechanically interchangeable?

A: Both are through-hole axial packages with compatible lead spacing and mounting characteristics. However, the P600 package is physically larger than DO-15. Verification of PCB layout compatibility is necessary before substitution.

Q: Which substitute part offers the best thermal performance?

A: The P6KE6.8A-AP and P6KE6.8A-BP both support the full -55°C to 175°C operating temperature range with automotive-grade qualification, matching the thermal envelope of the original 5KP6.5. The standard P6KE6.8A is limited to -55°C to 150°C.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All listed substitute components are RoHS3 compliant, consistent with the original 5KP6.5 specification.

Q: What is the difference between P6KE6.8A-AP and P6KE6.8A-BP?

A: Both parts share identical electrical specifications and automotive-grade qualification. The designations reflect different manufacturing or packaging batches from Micro Commercial Co. Electrical performance and compatibility are equivalent.