P6SMB68C Equivalent & Substitute Parts

Part Overview

The P6SMB68C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 58.1V reverse standoff voltage with 96.6V maximum clamping voltage and 6.6A peak pulse current capability in a DO-214AA (SMB) package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the 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	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the P6SMB68C is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 58.1V
Voltage - Clamping (Max) @ Ipp: Must be within the operational range of the original circuit
Current - Peak Pulse (10/1000µs): 6.6A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Type: Zener diode, bidirectional (1 channel)
Operating Temperature: -55°C to 150°C minimum

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

Group A - Matched Clamping Voltage (92V): Parts with clamping voltage of 92V provide the closest electrical match to the original 96.6V specification while maintaining the same reverse standoff voltage and peak pulse current ratings.

Group B - Higher Clamping Voltage (121V): Parts with clamping voltage of 121V operate at the same reverse standoff voltage but with increased clamping performance and higher peak pulse current capability (33A vs 6.6A).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Power - Peak Pulse [W]	Operating Temperature [°C]	Package	Product Status
P6SMB68C	Littelfuse Inc.	58.1	96.6	6.6	600	-55 to 150	DO-214AA, SMB	Obsolete
P6SMB68CA-E3/52	Vishay General Semiconductor - Diodes Division	58.1	92	6.5	600	-65 to 150	DO-214AA, SMB	Active
SMBJP6KE68CA-TP	Micro Commercial Co	58.1	92	6.6	600	-55 to 175	DO-214AA, SMB	Active
SM6T68CA	STMicroelectronics	58.1	121	33	600	-55 to 150	DO-214AA, SMB	Active
SM6T68CAY	STMicroelectronics	58.1	121	33	600	-55 to 150	DO-214AA, SMB	Active
SM6T68CA-E3/5B	Vishay General Semiconductor - Diodes Division	58.1	92	6.5	600	-65 to 150	DO-214AA, SMB	Active
TVP06B680CA-G	Comchip Technology	-	-	-	600	-55 to 150	DO-214AA, SMB	Active

Engineering Selection Recommendations

Primary Substitutes (Group A - 92V Clamping):

P6SMB68CA-E3/52 (Vishay) and SMBJP6KE68CA-TP (Micro Commercial Co) are direct functional equivalents with matched reverse standoff voltage (58.1V) and comparable peak pulse current (6.5A and 6.6A respectively). Both are ROHS3 compliant and active products. P6SMB68CA-E3/52 offers extended lower operating temperature (-65°C vs -55°C). SMBJP6KE68CA-TP provides extended upper operating temperature (-55°C to 175°C) and exact current matching (6.6A).

Secondary Substitutes (Group B - 121V Clamping):

SM6T68CA and SM6T68CAY (STMicroelectronics) and SM6T68CA-E3/5B (Vishay) maintain the 58.1V reverse standoff voltage but provide higher clamping voltage (121V) and significantly increased peak pulse current capability (33A). These parts are suitable for applications requiring enhanced transient suppression performance. SM6T68CAY includes AEC-Q101 automotive qualification. SM6T68CA-E3/5B offers extended lower operating temperature (-65°C).

Limited Data Substitute:

TVP06B680CA-G (Comchip Technology) is listed as an active substitute but lacks complete electrical parameter specification. This part should be cross-referenced with manufacturer documentation before selection.

All recommended substitutes maintain DO-214AA (SMB) surface-mount packaging, 600W peak pulse power rating, and ROHS3 compliance with MSL 1 (Unlimited) moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T68CA or SM6T68CAY as a direct replacement for P6SMB68C?

A: Yes, with circuit verification. Both parts maintain the same 58.1V reverse standoff voltage and 600W power rating in identical DO-214AA packaging. However, the clamping voltage is higher (121V vs 96.6V) and peak pulse current is significantly higher (33A vs 6.6A). These characteristics provide enhanced protection but may alter circuit response characteristics. Verify that the higher clamping voltage does not exceed downstream component voltage ratings.

Q: What is the difference between P6SMB68CA-E3/52 and SMBJP6KE68CA-TP?

A: Both are 92V clamping voltage equivalents with 58.1V reverse standoff voltage. P6SMB68CA-E3/52 operates from -65°C to 150°C and has 6.5A peak pulse current. SMBJP6KE68CA-TP operates from -55°C to 175°C with exact 6.6A current matching and extended upper temperature range. Select based on your application's temperature requirements.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitutes use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and footprint compatibility with the original P6SMB68C design.

Q: Why is TVP06B680CA-G listed if electrical parameters are missing?

A: TVP06B680CA-G is included based on the original part's substitute list and confirmed DO-214AA packaging compatibility. However, complete electrical parameter data is not provided. Obtain full specifications from Comchip Technology before design implementation.

Q: What does "Reverse Standoff Voltage" mean for TVS diode selection?

A: Reverse standoff voltage (58.1V for all primary substitutes) is the maximum voltage the TVS diode can withstand in normal operation without conducting. This parameter must match the original part to ensure the diode remains inactive during normal circuit operation.

Q: Can I substitute a part with higher peak pulse current?

A: Yes. Parts with higher peak pulse current (such as the 33A SM6T series) provide enhanced transient suppression capability. However, verify that the clamping voltage remains acceptable for your circuit's downstream components. Higher current capability does not negatively impact lower-current applications.

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