P6SMB68 Equivalent & Substitute Parts

Part Overview

The P6SMB68 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 58.1V reverse standoff voltage with 96.6V maximum clamping voltage and 6.6A peak pulse current. Housed in a DO-214AA (SMB) surface mount package, this component is designed for general-purpose transient voltage protection applications. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	58.1	V
Voltage - Breakdown (Min)	61.2	V
Voltage - Clamping (Max) @ Ipp	96.6	V
Current - Peak Pulse (10/1000µs)	6.6	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P6SMB68 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): Must be 58.1V to ensure proper circuit protection threshold
Package / Case: Must be DO-214AA or SMB to maintain PCB footprint compatibility
Mounting Type: Must be Surface Mount for assembly compatibility
Type: Must be Zener diode for functional equivalence
Unidirectional Channels: Must be 1 channel for circuit topology compatibility
Power - Peak Pulse: Must be 600W to handle transient energy dissipation
Operating Temperature Range: Must support -55°C to 150°C minimum

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (92V Clamping): P6SMB68A-E3/52, SM6T68A-E3/52, SM6T68A-E3/5B, SMBJP6KE68A-TP, TVP06B680A-G — These parts maintain 58.1V reverse standoff voltage with 92V maximum clamping voltage, representing a tighter clamping specification than the original 96.6V.

Group B (121V Clamping): SM6T68A, SM6T68AY — These parts maintain 58.1V reverse standoff voltage with 121V maximum clamping voltage, representing a higher clamping specification than the original 96.6V.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
P6SMB68	Littelfuse Inc.	58.1V	96.6V	6.6A	600W	-55 to 150°C	DO-214AA, SMB	Obsolete
P6SMB68A-E3/52	Vishay General Semiconductor - Diodes Division	58.1V	92V	6.5A	600W	-65 to 150°C	DO-214AA, SMB	Active
SM6T68A-E3/52	Vishay General Semiconductor - Diodes Division	58.1V	92V	6.5A	600W	-65 to 150°C	DO-214AA, SMB	Active
SM6T68A-E3/5B	Vishay General Semiconductor - Diodes Division	58.1V	92V	6.5A	600W	-65 to 150°C	DO-214AA, SMB	Active
SM6T68A	STMicroelectronics	58.1V	121V	33A (8/20µs)	600W	-55 to 150°C	DO-214AA, SMB	Active
SM6T68AY	STMicroelectronics	58.1V	121V	33A (8/20µs)	600W	-55 to 150°C	DO-214AA, SMB	Active
SMBJP6KE68A-TP	Micro Commercial Co	58.1V	92V	6.6A	600W	-55 to 175°C	DO-214AA, SMB	Active
TVP06B680A-G	Comchip Technology	—	—	—	600W	-55 to 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

All identified substitute parts maintain the critical 58.1V reverse standoff voltage and DO-214AA (SMB) package specification required for direct replacement of the obsolete P6SMB68.

Primary Substitutes (Group A - 92V Clamping): P6SMB68A-E3/52, SM6T68A-E3/52, SM6T68A-E3/5B, and SMBJP6KE68A-TP are active production parts with ROHS3 compliance and extended temperature ranges (-65°C to 150°C for Vishay parts, -55°C to 175°C for Micro Commercial Co). These parts provide tighter clamping voltage control at 92V compared to the original 96.6V specification.

Secondary Substitutes (Group B - 121V Clamping): SM6T68A and SM6T68AY from STMicroelectronics are active production parts with ROHS3 compliance. SM6T68AY carries AEC-Q101 automotive qualification. These parts provide higher clamping voltage at 121V and significantly higher peak pulse current (33A at 8/20µs pulse width) compared to the original 6.6A specification.

Limited Data Substitute: TVP06B680A-G from Comchip Technology is an active production part with ROHS3 compliance and DO-214AA (SMB) package compatibility. Specific electrical parameters (reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current) are not provided in available documentation.

Selection between Group A and Group B substitutes depends on circuit protection requirements: Group A provides closer electrical matching to the original P6SMB68 specification, while Group B offers enhanced transient suppression capability with higher current handling.

Frequently Asked Questions (FAQ)

Q: Can P6SMB68A-E3/52 directly replace P6SMB68?

A: Yes. Both parts maintain 58.1V reverse standoff voltage, 600W peak pulse power, and DO-214AA (SMB) surface mount package. The P6SMB68A-E3/52 provides 92V clamping voltage compared to the original 96.6V, representing a tighter protection threshold. Extended operating temperature range (-65°C to 150°C) provides additional margin.

Q: What is the difference between Group A (92V) and Group B (121V) substitutes?

A: Group A substitutes (P6SMB68A-E3/52, SM6T68A-E3/52, SM6T68A-E3/5B, SMBJP6KE68A-TP) maintain clamping voltage closer to the original specification at 92V. Group B substitutes (SM6T68A, SM6T68AY) provide higher clamping voltage at 121V and significantly higher peak pulse current (33A versus 6.6A). Selection depends on whether the circuit requires matched clamping characteristics or enhanced transient suppression capability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance certification, meeting current environmental and hazardous substance restrictions.

Q: Does SM6T68AY have automotive qualification?

A: Yes. SM6T68AY carries AEC-Q101 automotive qualification from STMicroelectronics, suitable for automotive and high-reliability applications requiring formal qualification documentation.

Q: What is the package compatibility for all substitutes?

A: All substitute parts use DO-214AA (SMB) surface mount package, maintaining identical PCB footprint and assembly compatibility with the original P6SMB68 design.

Q: Why is TVP06B680A-G listed as a substitute if electrical parameters are not provided?

A: TVP06B680A-G is included based on part number designation (68 voltage rating), DO-214AA (SMB) package compatibility, 600W peak pulse power rating, and active production status. Complete electrical parameter verification is required before circuit implementation.

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