P6SMB8.2AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB8.2AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 7.02V reverse standoff voltage with 12.1V maximum clamping voltage and 50A peak pulse current capability in the SMB (DO-214AA) package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	7.02	V
Voltage - Breakdown (Min)	7.79	V
Voltage - Clamping (Max) @ Ipp	12.1	V
Current - Peak Pulse (10/1000µs)	50	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65°C to 150°C	TJ
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the P6SMB8.2AT3G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 7.0V to 7.02V (±tolerance)
Voltage - Clamping (Max) @ Ipp: 12.0V to 12.1V
Current - Peak Pulse (10/1000µs): minimum 50A
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Type: Zener diode, unidirectional (1 channel)

Grouping Logic:

Group 1 - Direct Electrical Equivalents (Identical Voltage & Current Ratings): Parts maintaining 7.02V standoff, 12.1V clamping, and 50A+ peak pulse current in SMB packaging. These provide direct functional replacement with no circuit redesign required.

Group 2 - Higher Current Capacity Substitutes (Enhanced Performance): Parts with identical voltage ratings but increased peak pulse current (52A to 83.3A) and/or higher power dissipation (600W to 1000W). These provide superior transient protection margin and are suitable for applications requiring enhanced surge handling.

Group 3 - Voltage-Adjacent Substitutes (Marginal Parameter Variation): Parts with reverse standoff voltage of 7.0V and clamping voltage of 12.0V to 12.6V. These fall within acceptable tolerance bands for general-purpose protection but require circuit verification for critical applications.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) V	VC (Max) V	Ipp (10/1000µs) A	Power W	Package	Status
P6SMB8.2AT3G	Littelfuse Inc.	7.02	12.1	50	600	SMB	Obsolete
P6SMB8.2A	Taiwan Semiconductor Corporation	7.02	12.1	52	600	DO-214AA (SMB)	Active
P6SMB8.2A-E3/5B	Vishay General Semiconductor	7.02	12.1	49.6	600	DO-214AA (SMB)	Active
1KSMB8.2A	Littelfuse Inc.	7.02	12.1	82.6	1000	DO-214AA (SMBJ)	Active
SMB10J7.0A-E3/52	Vishay General Semiconductor	7.0	12.0	83.3	1000	DO-214AA (SMB)	Active
SMB10J7.0A-E3/5B	Vishay General Semiconductor	7.0	12.0	83.3	1000	DO-214AA (SMB)	Active
SMBJ7.0A	MDD	7.0	12.0	50	600	SMB/DO-214AA	Active
SMBJ7V0A	Fairchild Semiconductor	7.0	12.0	50	600	DO-214AA (SMB)	Active
SACB7.0	Littelfuse Inc.	7.0	12.6	38	500	SMB	Active
SM6T7V5A	STMicroelectronics	6.4	14.5	276	600	SMB (DO-214AA)	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for Production Continuity):

P6SMB8.2A (Taiwan Semiconductor Corporation) and P6SMB8.2A-E3/5B (Vishay General Semiconductor) are the primary direct replacements. Both maintain identical voltage specifications (7.02V standoff, 12.1V clamping) and equivalent current ratings (52A and 49.6A respectively). Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. These parts require no circuit modification and provide immediate functional equivalence.

Tier 2 - Enhanced Performance Substitutes (For Improved Transient Margin):

1KSMB8.2A (Littelfuse Inc.) maintains identical voltage ratings while providing 82.6A peak pulse current and 1000W power dissipation. This represents a significant performance upgrade suitable for applications requiring enhanced surge protection. Active product status and ROHS3 compliance confirmed.

SMB10J7.0A-E3/52 and SMB10J7.0A-E3/5B (Vishay General Semiconductor) offer 83.3A peak pulse current and 1000W power dissipation with marginally lower voltage specifications (7.0V standoff, 12.0V clamping). These fall within acceptable tolerance for general-purpose applications and provide superior transient handling.

Tier 3 - Voltage-Compatible Alternatives (For General-Purpose Applications):

SMBJ7.0A (MDD) and SMBJ7V0A (Fairchild Semiconductor) maintain 7.0V standoff and 12.0V clamping with 50A peak pulse current and 600W power dissipation, matching the original part's power handling. Both are active products with full compliance certifications.

SACB7.0 (Littelfuse Inc.) provides 7.0V standoff with 12.6V clamping but reduced current capacity (38A) and power (500W). This part is suitable only for lower-stress applications and should be evaluated against specific circuit requirements.

Not Recommended:

SM6T7V5A (STMicroelectronics) exhibits significantly different voltage characteristics (6.4V standoff, 14.5V clamping) and should not be used as a direct substitute without comprehensive circuit analysis and validation.

Frequently Asked Questions (FAQ)

Q: Can I use P6SMB8.2A as a direct replacement for P6SMB8.2AT3G?

A: Yes. P6SMB8.2A maintains identical voltage specifications (7.02V standoff, 12.1V clamping) and equivalent peak pulse current (52A vs. 50A). The part is active and fully compliant. No circuit modification is required.

Q: What is the difference between SMB and DO-214AA packaging?

A: SMB and DO-214AA refer to the same physical package outline. Both designations are equivalent and interchangeable for surface mount applications. The package dimensions and lead configuration are identical.

Q: Can I use 1KSMB8.2A instead of the original part?

A: Yes, with consideration for circuit design. 1KSMB8.2A maintains identical voltage ratings (7.02V standoff, 12.1V clamping) but provides higher peak pulse current (82.6A) and power dissipation (1000W). This represents an upgrade suitable for applications requiring enhanced transient protection. No circuit modification is necessary, though thermal management may require review.

Q: Why do some substitutes have 7.0V standoff instead of 7.02V?

A: The 0.02V difference falls within standard manufacturing tolerance for Zener diodes. Parts with 7.0V standoff are functionally equivalent for general-purpose protection applications. For critical voltage-sensitive circuits, verify the tolerance band against specific design requirements.

Q: Is SACB7.0 a suitable substitute?

A: SACB7.0 is not recommended as a primary substitute. While it maintains 7.0V standoff voltage, the reduced peak pulse current (38A vs. 50A) and power dissipation (500W vs. 600W) limit its suitability. Use only if circuit analysis confirms that lower transient current handling is acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts listed are ROHS3 compliant and REACH unaffected. Compliance certifications are maintained across all active alternatives.

Q: What is the operating temperature range difference between substitutes?

A: The original P6SMB8.2AT3G operates from -65°C to 150°C. Most active substitutes operate from -55°C to 150°C, representing a 10°C reduction in low-temperature performance. For applications requiring -65°C operation, verify substitute specifications or select P6SMB8.2A-E3/5B (Vishay), which maintains -65°C to 150°C range.

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