P6SMBJ39 Equivalent & Substitute Parts

Part Overview

The P6SMBJ39 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 33.3V reverse standoff voltage with a 56.6V clamping voltage at peak pulse current. This component is designed for general-purpose transient voltage suppression in surface-mount applications using the DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMBJ39
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	33.3V
Voltage - Clamping (Max) @ Ipp	56.6V
Current - Peak Pulse (10/1000µs)	11.3A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the P6SMBJ39 is determined by the following critical parameters that must remain consistent across equivalent parts:

Voltage - Reverse Standoff (Typ): 33.3V
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Unidirectional Channels: 1
Type: Zener

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

Group A (Lower Clamping Voltage): Parts with clamping voltage of 53.9V at peak pulse current, representing tighter voltage suppression characteristics.

Group B (Higher Clamping Voltage): Parts with clamping voltage of 69.7V at peak pulse current, representing higher voltage suppression with increased peak pulse current capability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status	RoHS Status
P6SMBJ39	Littelfuse Inc.	33.3V	35.15V	56.6V	11.3A	600W	-55°C ~ 150°C	DO-214AA, SMB	Obsolete	ROHS3 Compliant
P6SMB39A	Eaton - Electronics Division	33.3V	37.1V	53.9V	11.3A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active	RoHS Compliant
SZP6SMB39AT3G	Littelfuse	33.3V	37.1V	53.9V	11.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJP6KE39A-TP	Micro Commercial Co	33.3V	37.1V	53.9V	11.3A	600W	-55°C ~ 175°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T39A	STMicroelectronics	33.3V	37.1V	69.7V	57A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T39A-E3/52	Vishay General Semiconductor - Diodes Division	33.3V	37.1V	53.9V	11.1A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T39A-E3/5B	Vishay General Semiconductor - Diodes Division	33.3V	37.1V	53.9V	11.1A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T39AY	STMicroelectronics	33.3V	37.1V	69.7V	57A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain the critical 33.3V reverse standoff voltage and 600W peak pulse power rating required for functional equivalence to the P6SMBJ39. Selection among active alternatives should be based on the following factors:

For direct voltage performance matching: P6SMB39A (Eaton), SZP6SMB39AT3G (Littelfuse), SMBJP6KE39A-TP (Micro Commercial Co), SM6T39A-E3/52, and SM6T39A-E3/5B (Vishay) all provide 53.9V clamping voltage, closely aligned with the original 56.6V specification.

For extended temperature range: SZP6SMB39AT3G, SM6T39A-E3/52, and SM6T39A-E3/5B support -65°C minimum operating temperature, compared to -55°C for the original part. SMBJP6KE39A-TP extends the upper temperature limit to 175°C.

For automotive applications: SZP6SMB39AT3G and SM6T39AY carry AEC-Q101 qualification, suitable for automotive-grade requirements.

For higher transient current handling: SM6T39A and SM6T39AY provide 57A peak pulse current (8/20µs) with 69.7V clamping voltage, offering enhanced transient suppression capability at the cost of higher clamping voltage.

All substitute parts are RoHS compliant and available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T39A or SM6T39AY as direct replacements for P6SMBJ39?

A: These parts share the same 33.3V reverse standoff voltage and 600W power rating in the DO-214AA SMB package. However, they feature 69.7V clamping voltage compared to the original 56.6V, resulting in higher voltage suppression. They are functionally compatible if the circuit design tolerates the higher clamping voltage threshold.

Q: What is the difference between Group A and Group B substitute parts?

A: Group A parts (P6SMB39A, SZP6SMB39AT3G, SMBJP6KE39A-TP, SM6T39A-E3/52, SM6T39A-E3/5B) provide 53.9V clamping voltage, closer to the original 56.6V specification. Group B parts (SM6T39A, SM6T39AY) provide 69.7V clamping voltage with significantly higher peak pulse current (57A vs. 11.3A), suitable for applications requiring enhanced transient suppression.

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

A: Yes, all listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and electrical compatibility with the original P6SMBJ39 footprint.

Q: Which substitute part offers the best temperature range coverage?

A: SZP6SMB39AT3G, SM6T39A-E3/52, and SM6T39A-E3/5B support -65°C to 150°C operating temperature range, extending the lower temperature limit by 10°C compared to the original -55°C specification. SMBJP6KE39A-TP extends the upper limit to 175°C.

Q: Do all substitute parts meet RoHS compliance?

A: Yes, all listed substitute parts are RoHS compliant. The original P6SMBJ39 is ROHS3 compliant, and all active substitutes maintain equivalent or higher RoHS compliance status.

Q: Which substitute parts carry automotive qualification?

A: SZP6SMB39AT3G (Littelfuse) and SM6T39AY (STMicroelectronics) are qualified to AEC-Q101 automotive standards, suitable for automotive-grade applications.

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