5KP6.5C-B Equivalent & Substitute Parts

Part Overview

The 5KP6.5C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional zener diode features a 6.5V reverse standoff voltage and 11.76V maximum clamping voltage at peak pulse current, with 5000W peak pulse power handling in a through-hole P600 axial package.

The 5KP6.5C-B is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP6.5C-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	6.5V
Voltage - Breakdown (Min)	6.84V
Voltage - Clamping (Max) @ Ipp	11.76V
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 5KP6.5C-B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 6.5V
Voltage - Clamping (Max) @ Ipp: 11.76V (or within acceptable tolerance)
Power - Peak Pulse: 5000W (5kW)
Mounting Type: Through Hole
Package / Case: P600, Axial
Bidirectional Channels: 1
Type: Zener

Substitute parts are grouped into two categories:

Category A - Direct Package Equivalents (P600 Axial): Parts maintaining identical package form factor and 5000W power rating with compatible voltage parameters.

Category B - Alternative Package Options (DO-15/DO-201 Axial): Parts with reduced power ratings (600W or 1500W) but compatible voltage characteristics, suitable for applications where peak pulse power requirements are lower than the original specification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status
5KP6.5C-B	Littelfuse Inc.	6.5V	11.76V	5000W	P600, Axial	Obsolete
5KP6.5CA-B	Littelfuse Inc.	6.5V	11.2V	5000W	P600, Axial	Active
5KP6.5CA	Diotec Semiconductor	6.5V	11.2V	5000W	P600, Axial	Active
5KP6.5CE3/TR13	Microchip Technology	6.5V	12.3V	5000W	P600, Axial	Active
P6KE6.8CA	Taiwan Semiconductor Corporation	5.8V	10.5V	600W	DO-204AC, DO-15, Axial	Active
P6KE7.5CA	Taiwan Semiconductor Corporation	6.4V	11.3V	600W	DO-204AC, DO-15, Axial	Active
P6KE6V8CA	Taiwan Semiconductor Corporation	5.8V	10.5V	600W	DO-204AC, DO-15, Axial	Active
1.5KE6.8CA-G	Comchip Technology	5.8V	10.5V	1500W	DO-201AA, DO-27, Axial	Active
1.5KE6.8CA-TP	Micro Commercial Co	5.8V	10.5V	1500W	DO-201AE, Axial	Active
1.5KE6V8CA	STMicroelectronics	5.8V	13.4V	1500W	DO-201AA, DO-27, Axial	Active
1.5KE8.2CA-TP	Micro Commercial Co	7.02V	12.1V	1500W	DO-201AE, Axial	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

5KP6.5CA-B (Littelfuse Inc.) and 5KP6.5CA (Diotec Semiconductor) are the preferred direct substitutes. Both maintain the P600 axial package, 5000W power rating, and 6.5V reverse standoff voltage. The 5KP6.5CA-B is manufactured by the original equipment manufacturer and carries active product status with full compliance certifications (ROHS3, REACH Unaffected). The 5KP6.5CA from Diotec offers equivalent electrical performance with higher inventory availability.

5KP6.5CE3/TR13 (Microchip Technology) provides an alternative within the same package family with active product status and ROHS3 compliance. The slightly elevated clamping voltage (12.3V vs. 11.76V) remains within acceptable operating margins for general-purpose protection circuits.

Secondary Substitutes (Alternative Package Options):

Parts in the P6KE and 1.5KE series offer reduced power ratings (600W and 1500W respectively) with compatible voltage characteristics. These are suitable only for applications where peak pulse power requirements do not exceed their respective ratings. All listed alternatives maintain through-hole mounting, axial package orientation, and active product status with ROHS3 compliance.

Selection should prioritize parts with active product status and full compliance documentation (ROHS3, REACH Unaffected) to ensure long-term supply chain stability and regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can I use a 600W or 1500W rated TVS diode as a substitute for the 5KP6.5C-B (5000W)?

A: Only if your application's actual peak pulse power requirement is below the substitute part's rating. The 5KP6.5C-B is rated for 5000W peak pulse power. Using a lower-rated device in a 5000W application will result in device failure. Verify your circuit's peak pulse power specification before selecting a lower-rated substitute.

Q: What is the difference between the 5KP6.5CA-B and 5KP6.5CA?

A: Both parts share identical electrical specifications (6.5V reverse standoff, 11.2V clamping voltage, 5000W power rating) and P600 axial packaging. The primary difference is packaging format: 5KP6.5CA-B is supplied in bulk, while 5KP6.5CA is supplied in tape and reel. Both are active products from their respective manufacturers.

Q: Are P6KE and 1.5KE series parts pin-compatible with the 5KP6.5C-B?

A: Yes, all listed TVS diodes are bidirectional zener types with identical through-hole axial lead configurations. However, they use different package cases (DO-15 or DO-201 instead of P600). Physical board layout modifications may be required to accommodate the different package dimensions. Electrical performance differs due to lower power ratings and voltage characteristics.

Q: What does "Voltage - Clamping (Max) @ Ipp" mean?

A: This is the maximum voltage across the TVS diode when peak pulse current (Ipp) flows through it during a transient overvoltage event. Lower clamping voltage provides better protection for downstream components. The 5KP6.5C-B clamps at 11.76V maximum, while substitutes range from 10.5V to 13.4V depending on the part selected.

Q: Why is the 5KP6.5C-B marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active substitutes with equivalent or superior specifications are available from multiple manufacturers. Transitioning to an active product ensures continued availability and supply chain reliability.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes, all substitute parts listed carry ROHS3 compliance certification. This ensures compatibility with environmental and regulatory requirements for electronic component manufacturing and use.

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