P6SMB39A-M3/52 Equivalent & Substitute Parts

Part Overview

The P6SMB39A-M3/52 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 33.3V reverse standoff voltage class and provides 53.9V maximum clamping voltage with 11.1A peak pulse current capability. The device is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	33.3V
Voltage - Breakdown (Min)	37.1V
Voltage - Clamping (Max) @ Ipp	53.9V
Current - Peak Pulse (10/1000µs)	11.1A
Power - Peak Pulse	600W
Operating Temperature Range	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the P6SMB39A-M3/52 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Clamping (Max) @ Ipp: 53.9V (or higher, with engineering review)
Current - Peak Pulse: 11.1A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Product Status: Active

Parts are classified into two categories:

Direct Electrical Equivalents: Parts maintaining identical clamping voltage (53.9V) and comparable peak pulse current (11.1A–11.3A). These include P6SMB39A-E3/52 (Vishay, Tape & Reel packaging), P6SMB39A (Eaton), SMBJP6KE39A-TP (Micro Commercial Co), and SZP6SMB39AT3G (Littelfuse).

Functional Equivalents with Higher Performance: SM6T39A and SM6T39AY (STMicroelectronics) maintain the same reverse standoff voltage and package but feature higher clamping voltage (69.7V) and significantly higher peak pulse current (57A at 8/20µs). These parts provide enhanced transient suppression capability within the same physical footprint.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temperature	RoHS Status
P6SMB39A-M3/52	Vishay	33.3V	53.9V	11.1A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
P6SMB39A-E3/52	Vishay	33.3V	53.9V	11.1A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
P6SMB39A	Eaton	33.3V	53.9V	11.3A (10/1000µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	RoHS
SMBJP6KE39A-TP	Micro Commercial Co	33.3V	53.9V	11.3A (10/1000µs)	600W	DO-214AA, SMB	-55°C ~ 175°C	ROHS3
SZP6SMB39AT3G	Littelfuse	33.3V	53.9V	11.2A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
SM6T39A	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3
SM6T39AY	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3

Engineering Selection Recommendations

Direct Substitution (Identical Electrical Performance):

P6SMB39A-E3/52 (Vishay) is a direct substitute with identical electrical specifications. The primary difference is packaging format (Tape & Reel versus Tape & Box). Both maintain ROHS3 compliance and identical operating temperature range.

P6SMB39A (Eaton) and SMBJP6KE39A-TP (Micro Commercial Co) are functionally equivalent with marginally higher peak pulse current (11.3A) and maintain 600W peak pulse power. SMBJP6KE39A-TP extends the upper operating temperature to 175°C, providing additional thermal margin in high-temperature applications.

SZP6SMB39AT3G (Littelfuse) maintains identical electrical specifications with AEC-Q101 automotive qualification, suitable for automotive and harsh environment applications.

Enhanced Performance Substitution:

SM6T39A and SM6T39AY (STMicroelectronics) provide higher clamping voltage (69.7V) and significantly higher peak pulse current (57A at 8/20µs pulse width). These parts are suitable for applications requiring enhanced transient suppression. SM6T39AY includes AEC-Q101 automotive qualification. Selection of these parts requires circuit-level validation to confirm that the higher clamping voltage is compatible with downstream component ratings.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance or equivalent RoHS certification. MSL rating of 1 (Unlimited) is consistent across all parts, eliminating moisture sensitivity concerns for storage and handling.

Frequently Asked Questions (FAQ)

Q: Can P6SMB39A-E3/52 replace P6SMB39A-M3/52 directly?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (33.3V reverse standoff, 53.9V clamping voltage, 11.1A peak pulse current). The difference is packaging format: P6SMB39A-M3/52 uses Tape & Box while P6SMB39A-E3/52 uses Tape & Reel. Electrical performance and thermal characteristics are equivalent.

Q: What is the difference between the Eaton P6SMB39A and the Vishay P6SMB39A-M3/52?

A: Both maintain 33.3V reverse standoff and 53.9V clamping voltage. The Eaton part specifies 11.3A peak pulse current (versus 11.1A for Vishay) and operates over -55°C to 150°C (versus -65°C to 150°C for Vishay). The Eaton part is suitable for most applications; use Vishay if the extended -65°C lower temperature limit is required.

Q: Can SM6T39A or SM6T39AY be used as drop-in replacements?

A: Electrical substitution requires circuit validation. Both STMicroelectronics parts maintain the same 33.3V reverse standoff voltage and DO-214AA package but feature higher clamping voltage (69.7V versus 53.9V) and significantly higher peak pulse current (57A versus 11.1A). The higher clamping voltage may affect downstream component stress; confirm that all protected components tolerate 69.7V transient levels before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance or equivalent RoHS certification status, meeting environmental and regulatory requirements.

Q: What is the significance of AEC-Q101 qualification on SZP6SMB39AT3G and SM6T39AY?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and is required for automotive and safety-critical applications. SZP6SMB39AT3G and SM6T39AY are suitable for automotive use; other parts are general-purpose grade unless otherwise specified.

Q: Does packaging format (Tape & Box versus Tape & Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical and thermal performance are identical between P6SMB39A-M3/52 (Tape & Box) and P6SMB39A-E3/52 (Tape & Reel).

Q: What is the difference between 10/1000µs and 8/20µs pulse width specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform (used for Vishay, Eaton, and Micro Commercial Co parts) and 8/20µs waveform (used for STMicroelectronics parts) are standard test conditions for different application classes. Both are valid; selection depends on the actual transient waveform in the target application.

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