P6SMB6.8AT3 Equivalent & Substitute Parts

Part Overview

The P6SMB6.8AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, rated for 600W peak pulse power with a 6.8V nominal voltage rating in SMB packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The part operates as a Zener-type TVS diode for general-purpose transient voltage suppression applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB6.8AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Description	TVS ZENER UNIDIR 600W 6.8V SMB
Type	Zener
Unidirectional Channels	1
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the P6SMB6.8AT3 are grouped based on the following critical electrical and mechanical parameters:

Voltage Parameters: Reverse standoff voltage (Typ) of 5.8V–6V, breakdown voltage (Min) of 6.45V–6.67V, and clamping voltage (Max) at Ipp of 10.3V–10.5V ensure functional equivalence in transient suppression circuits.

Current & Power Ratings: Peak pulse current (10/1000µs) in the range of 57A–60A and peak pulse power of 600W maintain identical energy dissipation capability.

Package Compatibility: Surface mount DO-214AA (SMB or SMBJ variant) packaging ensures mechanical and electrical compatibility with existing PCB layouts.

Compliance & Status: Active product status with RoHS3 compliance provides long-term availability and regulatory alignment, contrasting with the obsolete status of the original part.

Parts listed as "Direct" substitutes share identical electrical specifications and packaging. Parts listed as "Similar" meet the core voltage and power requirements but may have minor variations in peak current or clamping voltage within acceptable engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
P6SMB6.8AT3	onsemi	—	—	—	—	600W	DO-214AA, SMB	Obsolete	RoHS non-compliant
SM6T6V8A-E3/52	Vishay General Semiconductor - Diodes Division	5.8V	6.45V	10.5V	57A	600W	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T6V8A-E3/5B	Vishay General Semiconductor - Diodes Division	5.8V	6.45V	10.5V	57A	600W	DO-214AA, SMB	Active	ROHS3 Compliant
P6SMB6.8A	Taiwan Semiconductor Corporation	5.8V	6.46V	10.5V	60A	600W	DO-214AA, SMB	Active	ROHS3 Compliant
P6SMB6.8A-E3/5B	Vishay General Semiconductor - Diodes Division	5.8V	6.45V	10.5V	57.1A	600W	DO-214AA, SMB	Active	ROHS3 Compliant
PTVS6V0P1UP,115	Nexperia USA Inc.	6V	6.67V	10.3V	58.3A	600W	SOD-128	Discontinued at DiGi Electronics	ROHS3 Compliant
SM6T6V8A	STMicroelectronics	5.8V	6.45V	13.4V	298A (8/20µs)	600W	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ5.0A	EVVO Semi	5V	6.4V	9.2V	65.3A	600W	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJP6KE6.8A-TP	Micro Commercial Co	5.8V	6.45V	10.5V	58.1A	600W	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents): SM6T6V8A-E3/52, SM6T6V8A-E3/5B, P6SMB6.8A, P6SMB6.8A-E3/5B, and SMBJP6KE6.8A-TP are recommended as primary substitutes. These parts maintain identical or near-identical voltage and power specifications with active product status and RoHS3 compliance. The difference between Cut Tape (CT) and Tape & Reel (TR) packaging variants affects only handling and assembly processes, not electrical performance.

Secondary Substitutes (Similar Specifications): SM6T6V8A (STMicroelectronics) and SMBJ5.0A (EVVO Semi) meet the core 600W power and SMB package requirements but exhibit variations in clamping voltage or peak current. SM6T6V8A provides higher clamping voltage (13.4V) and peak current (298A at 8/20µs), suitable for applications requiring enhanced transient suppression margin. SMBJ5.0A operates at a lower reverse standoff voltage (5V) and clamping voltage (9.2V), appropriate for lower-voltage circuit protection.

Alternative Package Consideration: PTVS6V0P1UP,115 (Nexperia) offers equivalent electrical performance but uses SOD-128 packaging instead of SMB. This part is discontinued at DiGi Electronics, limiting long-term availability.

Compliance Advantage: All recommended substitutes carry RoHS3 compliance, addressing the RoHS non-compliant status of the obsolete P6SMB6.8AT3. This ensures regulatory alignment for new production and future supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can SM6T6V8A-E3/52 and SM6T6V8A-E3/5B be used interchangeably with P6SMB6.8AT3? A: Yes. Both Vishay parts share identical electrical specifications (5.8V reverse standoff, 10.5V clamping, 57A peak pulse current, 600W power) and DO-214AA SMB packaging. The difference is packaging format: CT & Digi-Reel versus Tape & Reel. Electrical performance is identical.

Q: What is the difference between P6SMB6.8A and P6SMB6.8A-E3/5B? A: Both parts are functionally equivalent with 5.8V reverse standoff, 10.5V clamping, and 600W power ratings. P6SMB6.8A is manufactured by Taiwan Semiconductor Corporation with 60A peak pulse current. P6SMB6.8A-E3/5B is manufactured by Vishay with 57.1A peak pulse current. The 3A difference is within acceptable engineering tolerance for TVS diode applications.

Q: Why is PTVS6V0P1UP,115 listed as a substitute if it is discontinued? A: PTVS6V0P1UP,115 meets the electrical requirements (6V reverse standoff, 10.3V clamping, 58.3A peak pulse, 600W power) but uses SOD-128 packaging instead of SMB. It is listed for reference only; existing inventory may be available, but long-term sourcing is not recommended due to discontinued status.

Q: Can SMBJ5.0A replace P6SMB6.8AT3 in all applications? A: SMBJ5.0A operates at a lower voltage rating (5V reverse standoff versus 6.8V nominal). It is suitable only for circuits designed for 5V protection levels. Use only if the application circuit voltage is confirmed to be 5V or lower.

Q: What is the significance of RoHS3 compliance for substitute selection? A: RoHS3 compliance ensures the part meets current environmental and regulatory standards for electronic components. The original P6SMB6.8AT3 is RoHS non-compliant, making RoHS3-compliant substitutes necessary for new designs and production to meet regulatory requirements in most markets.

Q: Does packaging format (CT vs. TR) affect electrical performance? A: No. Cut Tape (CT) and Tape & Reel (TR) packaging formats affect only handling, storage, and assembly processes. Electrical specifications and performance are identical between variants of the same part number.

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