P6SMB39CA-M3/52 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The P6SMB39CA-M3/52 is a bidirectional Zener transient voltage suppressor diode manufactured by Vishay General Semiconductor - Diodes Division. This surface-mount component operates in the DO-214AA (SMB) package and is designed for general-purpose transient voltage suppression applications. The part is Active status and RoHS3 compliant. Substitute parts are necessary to address supply chain availability, packaging preferences, temperature range requirements, or peak pulse current specifications while maintaining electrical compatibility within defined parameter tolerances.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB39CA-M3/52 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 33.3V
Voltage - Breakdown (Min): Must be 37.1V or within tolerance
Voltage - Clamping (Max) @ Ipp: Must be 53.9V
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount
Type: Must be Zener bidirectional TVS diode
RoHS Status: Must be ROHS3 Compliant

Substitute parts are grouped into two categories based on peak pulse current and clamping voltage specifications:

Category A - Direct Electrical Equivalents (11.1A to 11.3A Ipp, 53.9V Clamp): Parts with identical or near-identical peak pulse current ratings and clamping voltage. These include 1KSMB39CA, P6SMB39CA (Meritek), SMBJP6KE39CA-TP, SZP6SMB39CAT3G, and TPSMB39CA.

Category B - Higher Performance Alternative (57A Ipp, 69.7V Clamp): Parts with significantly higher peak pulse current and clamping voltage. These include SM6T39CA and SM6T39CAY, suitable for applications requiring enhanced transient suppression capability.

Parameter Comparison

Parameter	P6SMB39CA-M3/52 (Vishay)	1KSMB39CA (TSC)	P6SMB39CA (Meritek)	SM6T39CA (STM)	SM6T39CAY (STM)	SMBJP6KE39CA-TP (MCC)	SZP6SMB39CAT3G (Littelfuse)	TPSMB39CA (Littelfuse)
Voltage - Reverse Standoff (Typ)	33.3V	33.3V	33.3V	33.3V	33.3V	33.3V	33.3V	33.3V
Voltage - Breakdown (Min)	37.1V	37.1V	37.05V	37.1V	37.1V	37.1V	37.1V	37.1V
Voltage - Clamping (Max) @ Ipp	53.9V	53.9V	53.9V	69.7V	69.7V	53.9V	53.9V	53.9V
Current - Peak Pulse (10/1000µs)	11.1A	18.6A	11.13A	57A (8/20µs)	57A (8/20µs)	11.3A	11.2A	11.3A
Power - Peak Pulse	600W	1000W	600W	600W	600W	600W	600W	600W
Operating Temperature Range	-65°C to 150°C	-55°C to 175°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 175°C	-65°C to 150°C	-65°C to 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Tape & Box (TB)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel	Cut Tape (CT) & Digi-Reel	Tape & Reel (TR)	Tape & Reel (TR)
Grade	—	—	—	—	Automotive (AEC-Q101)	—	Automotive (AEC-Q101)	Automotive (AEC-Q101)

Engineering Selection Recommendations

For Direct Electrical Replacement (Category A):

Select from TPSMB39CA (Littelfuse), SMBJP6KE39CA-TP (Micro Commercial Co), or P6SMB39CA (Meritek) when maintaining identical electrical performance is required. These parts maintain 53.9V clamping voltage and 11.1A to 11.3A peak pulse current specifications. TPSMB39CA offers the widest operating temperature range (-65°C to 175°C) and automotive-grade qualification (AEC-Q101). SMBJP6KE39CA-TP and TPSMB39CA both support extended upper temperature limits to 175°C, beneficial for high-temperature applications.

For Enhanced Transient Suppression (Category B):

SM6T39CA and SM6T39CAY (STMicroelectronics) provide higher peak pulse current (57A at 8/20µs) and elevated clamping voltage (69.7V). These are suitable only when circuit design permits higher clamping voltage. SM6T39CAY includes automotive-grade qualification (AEC-Q101) and is recommended for automotive applications requiring superior transient suppression.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. SM6T39CAY and TPSMB39CA carry AEC-Q101 automotive qualification, appropriate for automotive and mission-critical applications. SZP6SMB39CAT3G (Littelfuse) also provides AEC-Q101 qualification with automotive-grade designation.

Packaging and Availability:

1KSMB39CA (Taiwan Semiconductor Corporation) offers the highest inventory availability (3889 pcs) with 1000W peak pulse power rating, providing additional margin for high-energy transient events. TPSMB39CA (Littelfuse) provides the largest stock (65100 pcs) among all substitutes.

Frequently Asked Questions (FAQ)

Q: Can SM6T39CA or SM6T39CAY be used as direct replacements for P6SMB39CA-M3/52?

A: SM6T39CA and SM6T39CAY are electrically compatible in terms of reverse standoff voltage (33.3V) and breakdown voltage (37.1V), but they feature a higher clamping voltage of 69.7V compared to the original 53.9V. These parts are suitable only if the circuit design accommodates the higher clamping voltage. Peak pulse current is significantly higher (57A vs. 11.1A), providing enhanced transient suppression capability.

Q: What is the difference between 1KSMB39CA and the original P6SMB39CA-M3/52?

A: The 1KSMB39CA maintains identical voltage specifications (33.3V standoff, 37.1V breakdown, 53.9V clamp) and similar peak pulse current (18.6A vs. 11.1A). The primary differences are manufacturer (Taiwan Semiconductor Corporation vs. Vishay), packaging (Tape & Reel vs. Tape & Box), and peak pulse power rating (1000W vs. 600W). The higher current rating and power rating provide additional design margin.

Q: Are automotive-qualified versions available?

A: Yes. SM6T39CAY (STMicroelectronics), SZP6SMB39CAT3G (Littelfuse), and TPSMB39CA (Littelfuse) all carry AEC-Q101 automotive qualification and automotive-grade designation. These are appropriate for automotive and safety-critical applications.

Q: What is the impact of different operating temperature ranges?

A: The original P6SMB39CA-M3/52 operates from -65°C to 150°C. Substitutes with extended upper temperature limits (-55°C to 175°C) are suitable for high-temperature environments. TPSMB39CA and SMBJP6KE39CA-TP support the full -55°C to 175°C range. SZP6SMB39CAT3G maintains the original -65°C lower limit with 150°C upper limit.

Q: Does packaging type affect electrical performance?

A: No. Packaging type (Tape & Box, Tape & Reel, Cut Tape & Digi-Reel) does not affect electrical performance. Selection depends on manufacturing process requirements, inventory management, and supply chain logistics. All substitute parts use the same DO-214AA (SMB) package footprint.

Q: Can I use parts with different peak pulse current ratings?

A: Yes, if circuit design permits. Parts with higher peak pulse current (1KSMB39CA at 18.6A, SM6T39CA/SM6T39CAY at 57A) provide additional transient suppression capability. Parts with lower current ratings are not suitable as they may not adequately suppress transients. Verify that clamping voltage remains acceptable for the application.

Q: What does RoHS3 compliance mean?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials including lead, mercury, cadmium, and certain flame retardants. All listed substitute parts are RoHS3 compliant.

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