P6SMBJ6.8 Equivalent & Substitute Parts

Part Overview

The P6SMBJ6.8 is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This unidirectional Zener diode operates with a reverse standoff voltage of 5.8V and provides clamping at 11.03V with a peak pulse current of 58.1A. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMBJ6.8
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	5.8V
Voltage - Breakdown (Min)	6.12V
Voltage - Clamping (Max) @ Ipp	11.03V
Current - Peak Pulse (10/1000µs)	58.1A
Power - Peak Pulse	600W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the P6SMBJ6.8 is determined by the following critical electrical and mechanical parameters:

Reverse Standoff Voltage (Typ): 5.8V — must match exactly
Package / Case: DO-214AA, SMB — mechanical compatibility required
Mounting Type: Surface Mount — PCB assembly compatibility
Power - Peak Pulse: 600W — thermal dissipation capability
Voltage - Clamping (Max) @ Ipp: Range 10.5V to 13.4V — acceptable variation within transient protection design margins
Current - Peak Pulse (10/1000µs): Range 57A to 298A — acceptable variation based on application requirements
RoHS Status: ROHS3 Compliant — regulatory compliance requirement
Product Status: Active preferred — ensures ongoing availability and support

All substitute parts listed maintain the 5.8V reverse standoff voltage and DO-214AA package specification, ensuring direct functional and mechanical compatibility with the original P6SMBJ6.8 design.

Parameter Comparison

Parameter	P6SMBJ6.8 (Littelfuse)	P6SMB6.8A (TSC)	SMBJP6KE6.8A-TP (MCC)	SM6T6V8A (STMicroelectronics)	SM6T6V8A-E3/52 (Vishay)	SM6T6V8AY (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	5.8V	5.8V	5.8V	5.8V	5.8V	5.8V
Voltage - Breakdown (Min)	6.12V	6.46V	6.45V	6.45V	6.45V	6.45V
Voltage - Clamping (Max) @ Ipp	11.03V	10.5V	10.5V	13.4V	10.5V	13.4V
Current - Peak Pulse (10/1000µs)	58.1A	60A	58.1A	298A (8/20µs)	57A	298A (8/20µs)
Power - Peak Pulse	600W	600W	600W	600W	600W	600W
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMBJ	DO-214AA, SMB	DO-214AA, SMBJ	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

P6SMB6.8A (Taiwan Semiconductor Corporation) and SM6T6V8A-E3/52 (Vishay) provide the most direct electrical equivalence to the P6SMBJ6.8. Both maintain the 5.8V reverse standoff voltage, 600W peak pulse power, and DO-214AA package specification. P6SMB6.8A offers active product status with high inventory availability (39,550 pcs). SM6T6V8A-E3/52 provides extended lower operating temperature range (-65°C minimum) and active status with moderate inventory (1,599 pcs).

Alternative Substitutes (Acceptable Variation):

SMBJP6KE6.8A-TP (Micro Commercial Co) maintains electrical compatibility with extended operating temperature range to 175°C and high inventory availability (210,345 pcs). SM6T6V8A and SM6T6V8AY (STMicroelectronics) both feature higher peak pulse current capability (298A) and clamping voltage (13.4V), suitable for applications requiring enhanced transient suppression margin. SM6T6V8AY includes AEC-Q101 automotive qualification.

All substitute parts are ROHS3 compliant and carry active product status, ensuring long-term procurement viability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can P6SMB6.8A directly replace P6SMBJ6.8 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (5.8V), peak pulse power (600W), and DO-214AA package specification. The clamping voltage difference (10.5V vs 11.03V) falls within acceptable transient protection design margins for general-purpose applications.

Q: What is the difference between DO-214AA (SMB) and DO-214AA (SMBJ) packaging?

A: Both designations refer to the same physical DO-214AA surface-mount package. SMB and SMBJ are equivalent package identifiers used by different manufacturers. All listed parts are mechanically compatible.

Q: Why do SM6T6V8A and SM6T6V8AY show higher peak pulse current (298A)?

A: These parts use different pulse waveform specifications (8/20µs vs 10/1000µs). The higher current value reflects measurement under a different transient profile. Both maintain the same 600W peak pulse power rating and 5.8V reverse standoff voltage as the original part.

Q: Is SM6T6V8AY suitable for automotive applications?

A: Yes. SM6T6V8AY carries AEC-Q101 automotive qualification, making it suitable for automotive-grade designs requiring enhanced reliability standards.

Q: What inventory considerations should guide part selection?

A: P6SMB6.8A (39,550 pcs) and SMBJP6KE6.8A-TP (210,345 pcs) offer the highest inventory availability. SM6T6V8A-E3/52 (1,599 pcs) and SM6T6V8AY (18,911 pcs) provide moderate to good availability. All substitute parts maintain active product status, ensuring continued supply.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements.

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