P6SMB9.1AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB9.1AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This part operates with a 7.78V reverse standoff voltage and provides 13.4V clamping at peak pulse current. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

P6SMB9.1AT3G

Littelfuse Inc.In Stock: 6962P6SMB9.1AT3G Datasheet

Current PartRFQ

1KSMB9.1A

Littelfuse Inc.In Stock: 303071KSMB9.1A Datasheet

MFR RecommendedRFQ

P6SMB9.1A

Taiwan Semiconductor CorporationIn Stock: 23875P6SMB9.1A Datasheet

MFR RecommendedRFQ

P6SMB9.1A

Taiwan Semiconductor CorporationIn Stock: 23875P6SMB9.1A Datasheet

MFR RecommendedRFQ

P6SMB9.1A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 1126P6SMB9.1A-E3/5B Datasheet

MFR RecommendedRFQ

SM6T10A

STMicroelectronicsIn Stock: 15265SM6T10A Datasheet

MFR RecommendedRFQ

TVP06B9V1A-G

Comchip TechnologyIn Stock: 809TVP06B9V1A-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6SMB9.1AT3G are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Voltage - Reverse Standoff (Typ): 7.78V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 13.4V
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount
• Type: Zener diode, unidirectional

Parts meeting these core electrical specifications are considered direct substitutes. Secondary considerations include peak pulse current rating, power dissipation capability, and operating temperature range, which may vary within acceptable engineering margins for the application.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

1KSMB9.1A, P6SMB9.1A (Taiwan Semiconductor), P6SMB9.1A-E3/5B, and TVP06B9V1A-G all maintain the critical electrical parameters of the P6SMB9.1AT3G: 7.78V reverse standoff voltage and 13.4V clamping voltage. All are active products with ROHS3 compliance and unlimited moisture sensitivity rating. These parts are direct functional equivalents suitable for replacement in existing designs.

The 1KSMB9.1A offers enhanced peak pulse current capability (74.6A) and higher power dissipation (1000W), providing additional margin for applications requiring higher transient energy absorption.

Secondary Substitute (Limited Compatibility):

SM6T10A differs in voltage characteristics: 8.55V reverse standoff and 18.6V clamping voltage. This part is not a direct electrical equivalent and should only be selected if the application circuit can tolerate higher clamping voltage and different standoff voltage specifications.

All substitute parts are surface mount in DO-214AA/SMB package, maintaining mechanical compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB9.1A as a direct replacement for P6SMB9.1AT3G?

A: Yes. The 1KSMB9.1A maintains identical reverse standoff voltage (7.78V) and clamping voltage (13.4V). It offers higher peak pulse current (74.6A vs. 45A) and greater power dissipation (1000W vs. 600W), making it a compatible upgrade. Package and mounting type are identical.

Q: What is the difference between P6SMB9.1A from Taiwan Semiconductor and P6SMB9.1A-E3/5B from Vishay?

A: Both parts share identical electrical specifications: 7.78V reverse standoff, 13.4V clamping, and 600W peak pulse power. The primary difference is manufacturer and operating temperature range. The Vishay part (P6SMB9.1A-E3/5B) operates from -65°C to 150°C, while the Taiwan Semiconductor version operates from -55°C to 150°C. Select based on your application's low-temperature requirements.

Q: Why is SM6T10A listed as a substitute if it has different voltage ratings?

A: SM6T10A is included because it shares the same package (DO-214AA/SMB) and general TVS diode function. However, its 8.55V reverse standoff and 18.6V clamping voltage differ from the P6SMB9.1AT3G. This part is suitable only if your circuit design can accommodate higher clamping voltage and different standoff voltage specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1), matching the compliance profile of the original P6SMB9.1AT3G.

Q: What is the key parameter that determines if a part can substitute for P6SMB9.1AT3G?

A: The critical parameters are reverse standoff voltage (7.78V), clamping voltage (13.4V), and package type (DO-214AA/SMB surface mount). Parts matching these specifications are direct substitutes. Peak pulse current and power dissipation may vary, but the core voltage protection characteristics must align with the original design requirements.