5KP6.5-B Equivalent & Substitute Parts

Part Overview

The 5KP6.5-B is a unidirectional 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 part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar protection characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP6.5-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional 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 for the 5KP6.5-B is determined by the following critical parameters:

Primary Substitution Criteria:

Reverse standoff voltage within the 6.5V specification
Unidirectional channel configuration (1 channel)
Through-hole axial mounting compatibility
Peak pulse power rating of 5000W or greater
Operating temperature range of -55°C to 175°C minimum
Zener diode type classification

Grouping Logic:

Group 1 - Direct Littelfuse Equivalents (Preferred): Parts 5KP6.5A and 5KP6.5A-B maintain identical reverse standoff voltage (6.5V), matching package (P600), and equivalent power rating (5000W). These differ only in packaging format (Tape & Reel versus Bulk) and clamping voltage specification (11.2V versus 11.76V), both within acceptable tolerance for general-purpose protection.

Group 2 - Alternative Manufacturers with Modified Parameters: Parts 5KP6.5A-TP (Micro Commercial Co) and P6KE6.8A variants represent acceptable substitutes with maintained 6.5V standoff voltage and 5000W power rating, though package designations differ (R-6 versus P600). The P6KE6.8A series from HY Electronic and Fairchild Semiconductor operates at 5.8V standoff with reduced 600W power rating and different package (DO-15), suitable only for lower-power applications.

Group 3 - Cross-Manufacturer Options: P6KE6V8A from Fairchild Semiconductor provides 5.8V standoff voltage with 600W power rating in DO-15 package, representing a lower-power alternative for applications not requiring full 5000W capability.

Parameter Comparison

Parameter	5KP6.5-B	5KP6.5A	5KP6.5A-B	5KP6.5A-TP	P6KE6.8A	P6KE6V8A
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	HY Electronic	Fairchild Semiconductor
Type	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1	1
Voltage - Reverse Standoff (Typ)	6.5V	6.5V	6.5V	6.5V	5.8V	5.8V
Voltage - Breakdown (Min)	6.84V	7.22V	7.22V	7.22V	6.45V	6.45V
Voltage - Clamping (Max) @ Ipp	11.76V	11.2V	11.2V	11.2V	10.5V	13.4V
Power - Peak Pulse	5000W	5000W	5000W	5000W	600W	600W
Operating Temperature	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	P600, Axial	P600, Axial	P600, Axial	R-6, Axial	DO-15, Axial	DO-15, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant	Not Specified
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Tier 1 - Recommended Direct Substitutes:

5KP6.5A and 5KP6.5A-B are the primary recommended substitutes. Both maintain the original 6.5V reverse standoff voltage, 5000W power rating, and P600 axial package configuration. These parts are manufactured by Littelfuse Inc., the original manufacturer, ensuring design continuity. Both are ROHS3 compliant and active products with established supply availability. Selection between these two depends on packaging requirements: 5KP6.5A is supplied in Tape & Reel format, while 5KP6.5A-B is supplied in Bulk packaging.

Tier 2 - Alternative Manufacturer Substitutes:

5KP6.5A-TP (Micro Commercial Co) maintains the 6.5V standoff voltage and 5000W power rating with full -55°C to 175°C operating temperature range. The R-6 package differs from the original P600, requiring mechanical verification for board layout compatibility. This part is active and available.

Tier 3 - Lower-Power Alternatives:

P6KE6.8A series (HY Electronic and Micro Commercial Co variants) and P6KE6V8A (Fairchild Semiconductor) operate at reduced 600W power rating with 5.8V standoff voltage. These are suitable only for applications where peak pulse power requirements do not exceed 600W. The DO-15 package differs significantly from the original P600, requiring PCB redesign. P6KE6.8A-AP and P6KE6.8A-BP include automotive-grade certification and extended temperature range to 175°C.

Compliance Considerations:

All recommended Tier 1 and Tier 2 substitutes maintain ROHS3 compliance. Tier 3 alternatives from Micro Commercial Co maintain ROHS3 compliance; Fairchild Semiconductor compliance status is not specified in available data.

Frequently Asked Questions (FAQ)

Q: Can 5KP6.5A directly replace 5KP6.5-B without PCB modifications?

A: Yes. Both parts use identical P600 axial through-hole packages and maintain the same 6.5V reverse standoff voltage and 5000W power rating. No PCB layout changes are required. The primary difference is packaging format (Tape & Reel versus Bulk) and minor clamping voltage variation (11.2V versus 11.76V), both acceptable for general-purpose protection applications.

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

A: These parts are electrically identical, both manufactured by Littelfuse Inc. with matching 6.5V standoff voltage, 5000W power rating, and P600 package. The difference is packaging format: 5KP6.5A is supplied in Tape & Reel (TR) format for automated assembly, while 5KP6.5A-B is supplied in Bulk format. Selection depends on manufacturing process requirements.

Q: Can P6KE6.8A replace 5KP6.5-B?

A: P6KE6.8A is not a direct replacement. While it maintains through-hole axial mounting, it operates at 5.8V standoff voltage (versus 6.5V) and provides only 600W peak pulse power (versus 5000W). The DO-15 package differs from the original P600, requiring PCB redesign. This substitute is suitable only for applications with lower power requirements and different voltage specifications.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) reverse standoff voltage matching or exceeding 6.5V, (2) unidirectional channel configuration, (3) peak pulse power rating of 5000W or greater for direct replacement, (4) through-hole axial mounting type, (5) operating temperature range of -55°C to 175°C minimum, and (6) Zener diode type classification. Package form factor (P600 versus R-6 versus DO-15) affects PCB compatibility but does not affect electrical substitution.

Q: Is 5KP6.5A-TP a suitable substitute?

A: Yes, 5KP6.5A-TP is a suitable substitute with maintained 6.5V standoff voltage, 5000W power rating, and -55°C to 175°C operating temperature range. The R-6 package differs from the original P600, requiring mechanical verification that the component footprint and lead spacing are compatible with existing PCB layouts. This part is manufactured by Micro Commercial Co and is currently active.

Q: Why do P6KE6V8A and P6KE6.8A have different clamping voltages despite similar part numbers?

A: P6KE6V8A and P6KE6.8A are distinct product lines with different electrical specifications. P6KE6V8A (Fairchild Semiconductor) specifies 13.4V clamping voltage with 298A peak pulse current (8/20µs pulse), while P6KE6.8A (HY Electronic) specifies 10.5V clamping voltage with 57A peak pulse current (10/1000µs pulse). Both operate at 5.8V standoff voltage and 600W power rating but are not interchangeable due to different clamping characteristics.

Q: What is the inventory status of substitute parts?

A: 5KP6.5A has 2600 units in stock, 5KP6.5A-B has 782 units, 5KP6.5A-TP has 951 units, P6KE6.8A has 20220 units, P6KE6.8A-AP has 824 units, P6KE6.8A-BP has 787 units, and P6KE6V8A has 19200 units. The original 5KP6.5-B (obsolete) has 1135 units remaining in stock.

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