P6SMBJ6.8A Equivalent & Substitute Parts

Part Overview

The P6SMBJ6.8A is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This unidirectional Zener diode operates with a reverse standoff voltage of 5.8V and provides clamping at 10.5V maximum, with a peak pulse current rating of 58.1A. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMBJ6.8A

Littelfuse Inc.In Stock: 1190P6SMBJ6.8A Datasheet

Current PartRFQ

P6SMB6.8A

Taiwan Semiconductor CorporationIn Stock: 39620P6SMB6.8A Datasheet

DirectRFQ

SZP6SMB6.8AT3G

Littelfuse Inc.In Stock: 2448SZP6SMB6.8AT3G Datasheet

MFR RecommendedRFQ

P6SMB6.8A

Taiwan Semiconductor CorporationIn Stock: 39620P6SMB6.8A Datasheet

DirectRFQ

SMBJP6KE6.8A-TP

Micro Commercial CoIn Stock: 210418SMBJP6KE6.8A-TP Datasheet

DirectRFQ

SM6T6V8A

STMicroelectronicsIn Stock: 20198SM6T6V8A Datasheet

MFR RecommendedRFQ

SM6T6V8A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 1707SM6T6V8A-E3/52 Datasheet

MFR RecommendedRFQ

SM6T6V8A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 5273SM6T6V8A-E3/5B Datasheet

MFR RecommendedRFQ

SM6T6V8AY

STMicroelectronicsIn Stock: 19012SM6T6V8AY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMBJ6.8A is determined by strict alignment of the following critical electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 5.8V
• Voltage - Breakdown (Min): 6.45V minimum
• Voltage - Clamping (Max) @ Ipp: 10.5V maximum
• Current - Peak Pulse (10/1000µs): 57A to 60A range
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories based on these parameters:

Group 1 - Direct Electrical & Mechanical Equivalents (10.5V Clamping): Parts that maintain the exact 10.5V clamping voltage specification with peak pulse currents between 57A and 60A. These parts are fully interchangeable from an electrical standpoint.

Group 2 - Electrical Variants (13.4V Clamping): Parts that maintain the 5.8V reverse standoff voltage but feature higher clamping voltage (13.4V) and significantly higher peak pulse current capability (298A). These parts operate within the same voltage class but provide enhanced transient suppression performance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (10.5V Clamping Voltage):

The P6SMB6.8A (Taiwan Semiconductor Corporation) provides the most direct electrical equivalent with active product status, matching the 5.8V reverse standoff voltage, 10.5V clamping voltage, and 600W peak pulse power rating. This part is available in high inventory (39,550 pcs) and maintains ROHS3 compliance with MSL 1 rating.

The SMBJP6KE6.8A-TP (Micro Commercial Co) offers identical electrical specifications with extended operating temperature range (-55°C ~ 175°C) and high inventory availability (210,345 pcs). This part is suitable for applications requiring broader temperature performance.

The SM6T6V8A-E3/52 and SM6T6V8A-E3/5B (Vishay General Semiconductor) maintain the 10.5V clamping specification with extended lower temperature rating (-65°C ~ 150°C) and are available in active status. These parts are recommended for applications requiring enhanced low-temperature performance.

For Automotive Applications:

The SZP6SMB6.8AT3G (Littelfuse Inc.) carries AEC-Q101 automotive qualification and extended temperature range (-65°C ~ 150°C), making it suitable for automotive-grade designs. This part maintains the 10.5V clamping voltage specification.

The SM6T6V8AY (STMicroelectronics) provides AEC-Q101 qualification with higher clamping voltage (13.4V) and significantly enhanced peak pulse current (298A at 8/20µs), suitable for automotive applications requiring superior transient suppression performance.

For Enhanced Performance (13.4V Clamping Voltage):

The SM6T6V8A and SM6T6V8AY (STMicroelectronics) feature 13.4V clamping voltage with 298A peak pulse current capability, providing enhanced transient suppression compared to the original 10.5V specification. These parts are suitable for applications where higher transient energy absorption is required while maintaining the same 5.8V reverse standoff voltage class.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T6V8A or SM6T6V8AY as direct replacements for P6SMBJ6.8A?

A: These parts share the same 5.8V reverse standoff voltage and 600W peak pulse power rating, but feature higher clamping voltage (13.4V versus 10.5V) and significantly higher peak pulse current (298A versus 58.1A). They are electrically compatible for general transient voltage suppression but will clamp at a higher voltage level. Use these only if your circuit design permits the higher clamping voltage.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform is the standard specification for most TVS diodes. The 8/20µs waveform is an alternative test condition. Both specifications are provided by manufacturers; verify your application requirements match the specified pulse waveform.

Q: Are all substitute parts available in the same DO-214AA SMB package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility with the original P6SMBJ6.8A design.

Q: Which substitute part has the best availability?

A: The SMBJP6KE6.8A-TP (Micro Commercial Co) offers the highest inventory level at 210,345 pcs, followed by P6SMB6.8A (Taiwan Semiconductor Corporation) at 39,550 pcs.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original part's environmental compliance requirements.

Q: Which substitute part is recommended for automotive applications?

A: The SZP6SMB6.8AT3G (Littelfuse Inc.) and SM6T6V8AY (STMicroelectronics) both carry AEC-Q101 automotive qualification. The SZP6SMB6.8AT3G maintains the 10.5V clamping voltage, while the SM6T6V8AY provides enhanced performance with 13.4V clamping voltage and 298A peak pulse current.

Q: What is the temperature range difference between substitute parts?

A: Most parts operate from -55°C to 150°C. The SZP6SMB6.8AT3G, SM6T6V8A-E3/52, and SM6T6V8A-E3/5B extend the lower temperature limit to -65°C. The SMBJP6KE6.8A-TP extends the upper temperature limit to 175°C.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet your circuit's voltage and current requirements. However, maintain consistency within a single PCB assembly to ensure uniform transient suppression performance across all protected circuits.