P6SMB39A-M3/5B Equivalent & Substitute Parts

Part Overview

The P6SMB39A-M3/5B 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 transient protection with a 53.9V maximum clamping voltage. The part is Active status and widely used in general purpose transient voltage suppression applications. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AA (SMB) package family.

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	—

Substitute Part Grouping Explanation

Substitute parts for the P6SMB39A-M3/5B are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Clamping (Max) @ Ipp: 53.9V (or higher for enhanced protection)
Current - Peak Pulse: 11.1A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Grouping Logic:

Group 1 - Direct Electrical & Packaging Equivalents (Same Clamping Voltage): Parts with identical 53.9V clamping voltage, matching peak pulse current specifications, and identical DO-214AA SMB packaging. These provide direct functional replacement with no circuit redesign required.

Group 2 - Enhanced Protection Variants (Higher Clamping Voltage): Parts with 69.7V clamping voltage and higher peak pulse current (57A). These offer superior transient suppression capability while maintaining the same reverse standoff voltage and package form factor. Selection depends on application margin requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Package	RoHS Status
P6SMB39A-M3/5B	Vishay	33.3V	53.9V	11.1A (10/1000µs)	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
P6SMB39A-E3/52	Vishay	33.3V	53.9V	11.1A (10/1000µs)	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
P6SMB39A	Eaton	33.3V	53.9V	11.3A (10/1000µs)	600W	-55°C to 150°C	DO-214AA, SMB	RoHS
SMBJP6KE39A-TP	Micro Commercial Co	33.3V	53.9V	11.3A (10/1000µs)	600W	-55°C to 175°C	DO-214AA, SMB	ROHS3
SZP6SMB39AT3G	Littelfuse	33.3V	53.9V	11.2A (10/1000µs)	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
SM6T39A	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	-55°C to 150°C	DO-214AA, SMB	ROHS3
SM6T39AY	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	-55°C to 150°C	DO-214AA, SMB	ROHS3

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification):

Select from Group 1 parts when the application requires identical electrical performance and the original design margin is sufficient. P6SMB39A-E3/52 (Vishay, Tape & Reel packaging) provides the closest match to P6SMB39A-M3/5B with identical specifications and ROHS3 compliance. SMBJP6KE39A-TP (Micro Commercial Co) and SZP6SMB39AT3G (Littelfuse) are functionally equivalent with minor variations in peak pulse current (11.2A to 11.3A) and operating temperature ranges, all within acceptable tolerance for general purpose applications.

For Enhanced Protection Applications:

SM6T39A and SM6T39AY (STMicroelectronics) provide higher clamping voltage (69.7V) and significantly higher peak pulse current (57A at 8/20µs). These parts are suitable when additional transient margin is required. SM6T39AY includes AEC-Q101 automotive qualification and is available in higher inventory quantities (16,140 pcs).

Compliance Considerations:

All substitute parts maintain ROHS3 compliance. Operating temperature ranges vary: Vishay and Littelfuse parts support -65°C minimum, while Eaton and STMicroelectronics parts support -55°C minimum. Select based on application thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can P6SMB39A-E3/52 replace P6SMB39A-M3/5B directly?

A: Yes. Both parts are Vishay P6SMB series with identical electrical specifications (33.3V standoff, 53.9V clamping, 11.1A peak pulse). The difference is packaging format: M3/5B uses Tape & Box, while E3/52 uses Tape & Reel. Electrical performance and DO-214AA SMB package are identical.

Q: What is the difference between 53.9V clamping and 69.7V clamping variants?

A: The 53.9V clamping parts (P6SMB39A series) provide standard transient suppression for 33.3V standoff applications. The 69.7V clamping parts (SM6T39A/SM6T39AY) offer higher voltage margin and significantly higher peak pulse current (57A vs 11.1A), providing enhanced protection for more severe transient environments. Selection depends on application transient severity and design margin requirements.

Q: Are Littelfuse SZP6SMB39AT3G and Micro Commercial SMBJP6KE39A-TP compatible with the original design?

A: Yes. Both parts match the 33.3V standoff and 53.9V clamping specifications with peak pulse currents of 11.2A and 11.3A respectively, within tolerance of the original 11.1A specification. Both are ROHS3 compliant and use DO-214AA SMB packaging. SZP6SMB39AT3G includes AEC-Q101 automotive qualification.

Q: What is the operating temperature difference between substitutes?

A: P6SMB39A-M3/5B, P6SMB39A-E3/52, and SZP6SMB39AT3G support -65°C to 150°C. P6SMB39A (Eaton), SMBJP6KE39A-TP, and SM6T39A/SM6T39AY support -55°C to 150°C (or 175°C for SMBJP6KE39A-TP). Select based on application minimum operating temperature requirement.

Q: Can I use SM6T39AY in place of P6SMB39A-M3/5B?

A: Electrically compatible for the 33.3V standoff class, but with higher clamping voltage (69.7V) and peak pulse current (57A). This provides enhanced protection margin. Mechanical compatibility is maintained (DO-214AA SMB package). Use when additional transient suppression capability is required or when design margin allows higher clamping voltage.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitute parts maintain ROHS3 or equivalent RoHS compliance, ensuring environmental and regulatory compatibility.

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