5KP6.5C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP6.5C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., 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 product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP6.5C
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 5KP6.5C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 6.5V ± tolerance
Voltage - Clamping (Max) @ Ipp: within acceptable range for circuit protection
Power - Peak Pulse: minimum 5000W for equivalent protection capability
Bidirectional operation: single channel, bidirectional configuration
Mounting Type: through-hole axial package
Operating Temperature Range: -55°C minimum to 175°C maximum

Substitute Categories:

Category A - Direct Package Equivalents (P600 Axial): Parts maintaining identical P600 axial package with 5000W power rating and 6.5V standoff voltage specification. These provide direct mechanical and electrical compatibility.

Category B - Alternative Package Substitutes (DO-15/DO-201 Axial): Parts with different package types (DO-15 or DO-201) but compatible electrical characteristics. These require mechanical redesign considerations but maintain functional equivalence through comparable voltage and power ratings.

Category C - Reduced Power Rating Substitutes (600W-1500W): Parts with lower peak pulse power ratings suitable for applications with reduced transient energy requirements. These are applicable only when circuit analysis confirms lower energy dissipation needs.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
5KP6.5C	Littelfuse Inc.	6.5V	11.76V	5000W	P600, Axial	-55°C ~ 175°C	Obsolete	ROHS3 Compliant
5KP6.5CA	Diotec Semiconductor	6.5V	11.2V	5000W	P600, Axial	-50°C ~ 175°C	Active	ROHS3 Compliant
5KP6.5CE3/TR13	Microchip Technology	6.5V	12.3V	5000W	P600, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
P6KE6.8CA	Taiwan Semiconductor Corporation	5.8V	10.5V	600W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
P6KE7.5CA	Taiwan Semiconductor Corporation	6.4V	11.3V	600W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
P6KE6V8CA	Taiwan Semiconductor Corporation	5.8V	10.5V	600W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE6.8CA-G	Comchip Technology	5.8V	10.5V	1500W	DO-201AA, DO-27, Axial	-55°C ~ 150°C	Active	ROHS3 Compliant
1.5KE6.8CA-TP	Micro Commercial Co	5.8V	10.5V	1500W	DO-201AE, Axial	-55°C ~ 175°C	Active	Not Listed
1.5KE6V8CA	STMicroelectronics	5.8V	13.4V	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE8.2CA-TP	Micro Commercial Co	7.02V	12.1V	1500W	DO-201AE, Axial	-55°C ~ 175°C	Active	Not Listed
SA6.5CA-BP	Micro Commercial Co	6.5V	11.2V	500W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Active	Not Listed

Engineering Selection Recommendations

Primary Recommendation - Category A (Direct Equivalents):

The 5KP6.5CA (Diotec Semiconductor) and 5KP6.5CE3/TR13 (Microchip Technology) are the preferred substitutes. Both maintain the P600 axial package, 5000W power rating, and 6.5V reverse standoff voltage specification. Both manufacturers are active, with ROHS3 compliance and established supply availability. The 5KP6.5CA operates across -50°C to 175°C, while the 5KP6.5CE3/TR13 extends to -55°C, matching the original specification range. These parts require no circuit board redesign and provide direct functional replacement.

Secondary Recommendation - Category B (Alternative Packages):

The P6KE series (Taiwan Semiconductor Corporation) and 1.5KE series (Comchip Technology, Micro Commercial Co, STMicroelectronics) offer active product status with ROHS3 compliance. However, these parts feature different package types (DO-15 or DO-201) and reduced power ratings (600W or 1500W). Selection from this category requires circuit analysis to confirm that lower peak pulse power dissipation is acceptable for the application. The 1.5KE6.8CA-TP and 1.5KE6V8CA maintain the full -55°C to 175°C operating temperature range.

Not Recommended:

The SA6.5CA-BP (Micro Commercial Co) features only 500W peak pulse power, which is insufficient for applications requiring the original 5000W protection capability. This part is suitable only for significantly reduced transient energy scenarios.

Frequently Asked Questions (FAQ)

Q: Can I use the 5KP6.5CA as a direct replacement for the 5KP6.5C?

A: Yes. The 5KP6.5CA maintains identical package type (P600 axial), power rating (5000W), and reverse standoff voltage (6.5V). The clamping voltage is slightly lower (11.2V vs 11.76V), which remains within acceptable protection parameters. Operating temperature range is -50°C to 175°C, covering most applications except those requiring -55°C minimum operation.

Q: What is the difference between P600 and DO-15 packages?

A: P600 and DO-15 are both through-hole axial packages but have different physical dimensions and lead spacing. Direct substitution between these packages requires circuit board redesign. The P600 package is larger and typically used for higher power applications.

Q: Why do some substitutes have lower power ratings (600W or 1500W)?

A: Lower power-rated parts dissipate less energy during transient events. These are suitable only when circuit analysis confirms that peak transient energy is below the part's rating. The original 5KP6.5C with 5000W rating provides protection for higher-energy transient events.

Q: Are all substitute parts ROHS3 compliant?

A: Most active substitutes listed are ROHS3 compliant. The 1.5KE6.8CA-TP and 1.5KE8.2CA-TP (Micro Commercial Co) and SA6.5CA-BP do not list RoHS status in available documentation. Verify compliance requirements with your procurement specifications before selection.

Q: Can I use the 1.5KE6V8CA (STMicroelectronics) as a substitute?

A: The 1.5KE6V8CA is functionally compatible with a 5.8V reverse standoff voltage and 1500W power rating. However, the reduced power rating (1500W vs 5000W) limits its use to applications with lower transient energy. The higher clamping voltage (13.4V) may also affect circuit protection thresholds. Use only after confirming application requirements.

Q: What is the operating temperature significance?

A: The original 5KP6.5C operates from -55°C to 175°C. Most substitutes maintain this range, except the 5KP6.5CA (-50°C minimum) and 1.5KE6.8CA-G (-55°C to 150°C maximum). Select parts matching your application's temperature requirements to ensure reliable protection across the full operating range.

Q: Do I need to change my circuit board layout for alternative package substitutes?

A: Yes. Substitutes using DO-15 or DO-201 packages have different physical dimensions and lead spacing than the P600 package. Circuit board redesign is required for mechanical compatibility. Direct P600 substitutes (5KP6.5CA and 5KP6.5CE3/TR13) require no layout changes.

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