P6KE6.8 Equivalent & Substitute Parts

Part Overview

The P6KE6.8 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features a 5.8V reverse standoff voltage, 11.03V maximum clamping voltage, and 600W peak pulse power rating in a DO-15 (DO-204AC) axial package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	P6KE6.8
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	5.8V
Voltage - Breakdown (Min)	6.12V
Voltage - Clamping (Max) @ Ipp	11.03V
Power - Peak Pulse	600W
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the P6KE6.8 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 5.8V (typical)
Breakdown voltage minimum: 6.12V or higher
Unidirectional configuration (1 channel)
Through-hole mounting in DO-15 package
Peak pulse power rating: 600W or higher
General-purpose application compatibility

Substitution Groups:

Group 1: Direct Electrical Equivalents (10.5V Clamping) Parts with 10.5V maximum clamping voltage, 57A peak pulse current, and 600W power rating. These provide equivalent protection performance with active product status.

Group 2: Enhanced Performance Alternatives (13.4V Clamping) Parts with 13.4V maximum clamping voltage and higher peak pulse current (298A at 8/20µs). These offer increased transient suppression capability while maintaining the same reverse standoff voltage and package form factor.

Parameter Comparison

Parameter	P6KE6.8	P6KE6.8A	BZW04-5V8	BZW06-5V8	P6KE6.8A-G	P6KE6.8A-TP	P6KE6V8A
Voltage - Reverse Standoff (Typ)	5.8V	5.8V	5.8V	5.8V	5.8V	5.8V	5.8V
Voltage - Breakdown (Min)	6.12V	6.45V	6.45V	6.45V	6.45V	6.45V	6.45V
Voltage - Clamping (Max) @ Ipp	11.03V	10.5V	10.5V	13.4V	10.5V	10.5V	13.4V
Current - Peak Pulse (10/1000µs)	—	57A	38A	298A (8/20µs)	57.14A	57A	298A (8/20µs)
Power - Peak Pulse	600W	600W	400W	600W	600W	600W	600W
Operating Temperature	-55°C ~ 175°C	-55°C ~ 150°C	-50°C ~ 175°C	—	-55°C ~ 150°C	-55°C ~ 175°C	—
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance): Select P6KE6.8A (HY Electronic), P6KE6.8A-G (Comchip Technology), or P6KE6.8A-TP (Micro Commercial Co) when maintaining the original circuit design parameters is required. These parts deliver 10.5V clamping voltage and 600W peak pulse power with active product status and full RoHS3 compliance. All three are available in DO-15 through-hole packages.

For Enhanced Protection (Higher Current Handling): Select BZW06-5V8 (STMicroelectronics) or P6KE6V8A (Fairchild Semiconductor) when increased transient suppression capability is acceptable. Both provide 13.4V clamping voltage, 298A peak pulse current (8/20µs), and 600W power rating. These are suitable for applications requiring superior overvoltage protection margins.

For Cost-Optimized Selection: BZW04-5V8 (Diotec Semiconductor) offers 10.5V clamping voltage and 38A peak pulse current at 400W power rating. This part is appropriate only when the application circuit can tolerate reduced power dissipation capacity compared to the original P6KE6.8 specification.

All recommended substitutes maintain ROHS3 compliance and unidirectional configuration in DO-15 axial packages, ensuring mechanical and electrical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can P6KE6.8A directly replace P6KE6.8 in all applications? A: Yes. P6KE6.8A maintains identical reverse standoff voltage (5.8V), equivalent clamping voltage (10.5V vs. 11.03V), and matching 600W power rating in the same DO-15 package. The part is electrically compatible for general-purpose transient suppression circuits.

Q: What is the difference between the 10.5V clamping group and the 13.4V clamping group? A: The 10.5V group (P6KE6.8A, P6KE6.8A-G, P6KE6.8A-TP, BZW04-5V8) provides clamping voltage closer to the original P6KE6.8 specification. The 13.4V group (BZW06-5V8, P6KE6V8A) offers higher clamping voltage and significantly higher peak pulse current (298A), providing enhanced protection for severe transient events. Selection depends on circuit protection requirements.

Q: Why does BZW04-5V8 have only 400W power rating? A: BZW04-5V8 is rated for 400W peak pulse power, which is lower than the P6KE6.8 specification of 600W. This part is suitable only for applications where the original 600W rating is not a critical design requirement.

Q: Are all substitute parts available in the same DO-15 package? A: Yes. All listed substitutes are available in DO-15 (DO-204AC) axial through-hole packages, ensuring direct mechanical compatibility with existing PCB layouts.

Q: What is the operating temperature range consideration for substitution? A: P6KE6.8 operates from -55°C to 175°C. P6KE6.8A and P6KE6.8A-G operate to 150°C maximum. P6KE6.8A-TP and BZW06-5V8 support the full -55°C to 175°C range. Verify application temperature requirements before selection.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant, meeting environmental and regulatory requirements equivalent to the original P6KE6.8.

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