SZP6SMB39AT3G Equivalent & Substitute Parts

Part Overview

The SZP6SMB39AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, rated for 33.3V reverse standoff voltage with 53.9V maximum clamping voltage. This surface mount component in SMB (DO-214AA) package is designed for transient overvoltage protection in electronic circuits. The part is active in production with AEC-Q101 automotive qualification and ROHS3 compliance. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters that ensure functional interchangeability in circuit protection applications.

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)	11.2	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SZP6SMB39AT3G are qualified based on the following critical parameters:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Breakdown (Min): 37.1V
Voltage - Clamping (Max) @ Ipp: 53.9V (with tolerance for variants up to 69.7V where specified)
Current - Peak Pulse (10/1000µs): 11.2A minimum
Power - Peak Pulse: 600W minimum
Package / Case: DO-214AA or SMB equivalent
Operating Temperature: -55°C to 175°C minimum range
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Parts are grouped into two categories: direct electrical equivalents with identical clamping voltage (53.9V) and functional alternatives with higher clamping voltage (69.7V) that maintain the same reverse standoff and breakdown characteristics. All substitute parts maintain unidirectional channel configuration and Zener diode type.

Parameter Comparison

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	RoHS Status
SZP6SMB39AT3G	Littelfuse	33.3V	37.1V	53.9V	11.2A	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
1KSMB39A	Taiwan Semiconductor Corporation	33.3V	37.1V	53.9V	18.6A	1000W	-55°C to 175°C	DO-214AA, SMB	ROHS3
P6SMB39A	Eaton - Electronics Division	33.3V	37.1V	53.9V	11.3A	600W	-55°C to 150°C	DO-214AA, SMB	RoHS
TPSMB39A	Littelfuse Inc.	33.3V	37.1V	53.9V	11.3A	600W	-65°C to 175°C	DO-214AA, SMB	ROHS3
P6SMB39A-E3/52	Vishay General Semiconductor - Diodes Division	33.3V	37.1V	53.9V	11.1A	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
SM6T39A	STMicroelectronics	33.3V	37.1V	69.7V	57A (8/20µs)	600W	-55°C to 150°C	DO-214AA, SMB	ROHS3
SM6T39A-E3/52	Vishay General Semiconductor - Diodes Division	33.3V	37.1V	53.9V	11.1A	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
SM6T39A-E3/5B	Vishay General Semiconductor - Diodes Division	33.3V	37.1V	53.9V	11.1A	600W	-65°C to 150°C	DO-214AA, SMB	ROHS3
SM6T39AY	STMicroelectronics	33.3V	37.1V	69.7V	57A (8/20µs)	600W	-55°C to 150°C	DO-214AA, SMB	ROHS3
SMBJP6KE39A-TP	Micro Commercial Co	33.3V	37.1V	53.9V	11.3A	600W	-55°C to 175°C	DO-214AA, SMB	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance. Selection between direct equivalents (53.9V clamping) and higher-clamping alternatives (69.7V) depends on circuit protection requirements:

Direct Equivalents (53.9V Clamping): P6SMB39A-E3/52, SM6T39A-E3/52, SM6T39A-E3/5B, and SMBJP6KE39A-TP provide electrical characteristics matching the SZP6SMB39AT3G within specified tolerances. TPSMB39A offers extended temperature range (-65°C to 175°C) while maintaining Littelfuse manufacturing and AEC-Q101 automotive qualification identical to the original part.

Higher-Clamping Alternatives (69.7V): SM6T39A and SM6T39AY from STMicroelectronics provide increased peak pulse current (57A) and higher clamping voltage, suitable for applications requiring enhanced transient suppression. SM6T39AY includes AEC-Q101 automotive qualification.

Enhanced Performance Option: 1KSMB39A from Taiwan Semiconductor Corporation delivers 1000W peak pulse power (versus 600W) with 18.6A peak pulse current, providing superior energy dissipation capability while maintaining identical voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can SM6T39A or SM6T39AY be used as direct replacements for SZP6SMB39AT3G?

A: Yes, with circuit design consideration. Both parts maintain identical reverse standoff (33.3V) and breakdown (37.1V) voltages. The higher clamping voltage (69.7V versus 53.9V) and increased peak pulse current (57A versus 11.2A) make these suitable for applications requiring enhanced transient suppression. Circuit validation is necessary to confirm the higher clamping voltage does not exceed downstream component ratings.

Q: What is the difference between P6SMB39A and P6SMB39A-E3/52?

A: Both parts are manufactured by different suppliers (Eaton and Vishay respectively) with identical electrical specifications. P6SMB39A-E3/52 includes ROHS3 compliance and extended temperature range to -65°C. Packaging and supplier device package designations differ (SMB versus DO-214AA SMB).

Q: Is TPSMB39A compatible with automotive applications?

A: Yes. TPSMB39A carries AEC-Q101 automotive qualification and ROHS3 compliance, matching the original SZP6SMB39AT3G. It also provides extended operating temperature range (-65°C to 175°C) compared to the original part's -65°C to 150°C range.

Q: Can 1KSMB39A replace SZP6SMB39AT3G in all applications?

A: 1KSMB39A maintains identical voltage characteristics (33.3V standoff, 37.1V breakdown, 53.9V clamping) and is electrically compatible. The higher peak pulse power (1000W versus 600W) and current (18.6A versus 11.2A) provide enhanced capability. Operating temperature range extends to 175°C. No circuit modifications are required for direct substitution.

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

A: Yes. All listed substitute parts use DO-214AA or SMB package designations, ensuring mechanical and thermal compatibility with the original SZP6SMB39AT3G footprint and PCB layout.

Q: What is the significance of the -E3/52 and -E3/5B designations in Vishay part numbers?

A: These designations indicate Vishay's internal packaging and tape configuration specifications. Both P6SMB39A-E3/52 and SM6T39A-E3/52 maintain identical electrical performance and are functionally interchangeable. The -E3/5B variant (SM6T39A-E3/5B) represents an alternative tape configuration with equivalent electrical characteristics.

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