P6SMB150AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB150AT3G is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 128V reverse standoff voltage and 207V maximum clamping voltage, delivering 2.9A peak pulse current in a compact SMB (DO-214AA) package. The P6SMB150AT3G is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	128	V
Voltage - Breakdown (Min)	143	V
Voltage - Clamping (Max) @ Ipp	207	V
Current - Peak Pulse (10/1000µs)	2.9	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65 to 150	°C (TJ)
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the P6SMB150AT3G are classified into two functional groups based on electrical parameter alignment:

Group 1: Direct Electrical Equivalents (600W Power Rating) Parts maintaining identical or equivalent electrical specifications: 128V reverse standoff, 143V minimum breakdown, 207V maximum clamping, and 2.9A peak pulse current at 600W power dissipation. These parts are mechanically and electrically interchangeable with the original P6SMB150AT3G.

Qualifying parts: P6SMB150A (Good-Ark Semiconductor), SM6T150A-E3/5B (Vishay), SM6T150A-M3/52 (Vishay), SM6T150A-M3/5B (Vishay), SMBJP6KE150A-TP (Micro Commercial Co), TVP06B151A-G (Comchip Technology).

Group 2: Enhanced Performance Alternatives (1kW Power Rating) The 1KSMB150A (Littelfuse Inc.) maintains identical voltage specifications (128V standoff, 143V breakdown, 207V clamping) but delivers 4.8A peak pulse current at 1000W power dissipation. This part provides superior transient energy absorption capability while preserving voltage protection characteristics.

Group 3: Voltage-Shifted Alternative The SMBJ150A (MDD) operates at 150V reverse standoff with 167V minimum breakdown and 243V maximum clamping. This part is suitable only when the application circuit tolerates higher voltage thresholds.

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	Package / Case	Operating Temperature	Product Status
P6SMB150AT3G	Littelfuse Inc.	128V	143V	207V	2.9A	600W	DO-214AA, SMB	-65 to 150°C	Obsolete
1KSMB150A	Littelfuse Inc.	128V	143V	207V	4.8A	1000W	DO-214AA, SMB	-55 to 150°C	Active
P6SMB150A	Good-Ark Semiconductor	128V	143V	207V	2.9A	600W	DO-214AA, SMB	-55 to 150°C	Active
SMBJ150A	MDD	150V	167V	243V	2.5A	600W	DO-214AA, SMB	-50 to 150°C	Active
SM6T150A-E3/5B	Vishay General Semiconductor - Diodes Division	128V	143V	207V	2.9A	600W	DO-214AA, SMB	-65 to 150°C	Active
SM6T150A	STMicroelectronics	128V	143V	265V	15A (8/20µs)	600W	DO-214AA, SMB	-55 to 150°C	Active
SM6T150A-M3/52	Vishay General Semiconductor - Diodes Division	128V	143V	207V	2.9A	600W	DO-214AA, SMB	-65 to 150°C	Active
SM6T150A-M3/5B	Vishay General Semiconductor - Diodes Division	128V	143V	207V	2.9A	600W	DO-214AA, SMB	-65 to 150°C	Active
SMBJP6KE150A-TP	Micro Commercial Co	128V	143V	207V	2.9A	600W	DO-214AA, SMB	-55 to 175°C	Active
TVP06B151A-G	Comchip Technology	128V	142.5V	207V	2.9A	600W	DO-214AA, SMB	-55 to 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance)

Select from Group 1 direct equivalents when the application requires exact voltage and current specifications: P6SMB150A (Good-Ark Semiconductor), SM6T150A-E3/5B, SM6T150A-M3/52, SM6T150A-M3/5B (Vishay General Semiconductor - Diodes Division), SMBJP6KE150A-TP (Micro Commercial Co), or TVP06B151A-G (Comchip Technology). All maintain 128V reverse standoff, 143V breakdown, 207V clamping, and 2.9A peak pulse current. All substitute parts are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental regulatory alignment.

For Enhanced Transient Protection

The 1KSMB150A (Littelfuse Inc.) is selected when circuit design permits higher transient energy absorption. This part delivers 4.8A peak pulse current at 1000W power dissipation while maintaining identical voltage thresholds. The 1KSMB150A is an active Littelfuse product, preserving manufacturer continuity and supply chain stability.

For Elevated Voltage Threshold Applications

The SMBJ150A (MDD) is selected only when the application circuit operates at higher voltage levels, requiring 150V reverse standoff and 243V clamping. This part is not interchangeable with the P6SMB150AT3G for circuits designed around 128V protection thresholds.

Temperature Range Considerations

The SM6T150A-E3/5B, SM6T150A-M3/52, and SM6T150A-M3/5B (Vishay) extend the lower operating temperature to -65°C, matching the original P6SMB150AT3G specification. The SMBJP6KE150A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, providing enhanced thermal margin for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB150A replace the P6SMB150AT3G in all applications?

A: The 1KSMB150A maintains identical voltage specifications (128V standoff, 143V breakdown, 207V clamping) and is mechanically compatible in the DO-214AA SMB package. The higher current rating (4.8A vs. 2.9A) and power dissipation (1000W vs. 600W) provide enhanced transient protection without degrading circuit performance. Electrical compatibility is confirmed; however, thermal design review is recommended for applications operating near maximum power dissipation limits.

Q: Is the SMBJ150A a suitable substitute for the P6SMB150AT3G?

A: The SMBJ150A is not a direct substitute. While both parts use the DO-214AA SMB package, the SMBJ150A operates at 150V reverse standoff versus 128V for the P6SMB150AT3G. The higher voltage threshold (150V vs. 128V) and clamping voltage (243V vs. 207V) make this part suitable only for circuits designed to tolerate elevated protection thresholds. Substitution requires circuit validation.

Q: What is the difference between SM6T150A variants (E3/5B, M3/52, M3/5B)?

A: All three Vishay SM6T150A variants maintain identical electrical specifications: 128V standoff, 143V breakdown, 207V clamping, and 2.9A peak pulse current. The designations (E3/5B, M3/52, M3/5B) indicate different packaging configurations and tape reel specifications. Selection depends on procurement and assembly requirements; electrical performance is equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory status of the original P6SMB150AT3G. This ensures compliance with current manufacturing and environmental standards.

Q: What is the significance of the operating temperature range differences?

A: The original P6SMB150AT3G operates from -65°C to 150°C. Vishay SM6T150A variants (E3/5B, M3/52, M3/5B) maintain this full range. Most other substitutes operate from -55°C to 150°C, reducing the lower temperature margin by 10°C. The SMBJP6KE150A-TP extends the upper limit to 175°C. Temperature range selection depends on application environment; verify that substitute part specifications align with circuit operating conditions.

Q: Can the SM6T150A (STMicroelectronics) be used as a direct replacement?

A: The STMicroelectronics SM6T150A maintains the 128V standoff and 143V breakdown specifications but specifies 265V maximum clamping voltage and 15A peak pulse current (8/20µs pulse), differing from the original 207V clamping and 2.9A (10/1000µs) specification. This part provides enhanced transient suppression capability but operates under different electrical parameters. Substitution requires circuit validation to confirm compatibility with the application's transient protection requirements.

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