P6SMB68CA-M3/5B Equivalent & Substitute Parts

Part Overview

The P6SMB68CA-M3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode is designed for general-purpose overvoltage protection in surface-mount applications using the DO-214AA (SMB) package. The part is active and in production with 982 units currently in stock.

Finding equivalent and substitute parts may be necessary due to supply chain constraints, packaging format requirements, or specific application needs while maintaining electrical compatibility within defined parameters.

Substiute Parts

P6SMB68CA-M3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 993P6SMB68CA-M3/5B Datasheet

Current PartRFQ

P6SMB68CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 3138P6SMB68CA-E3/52 Datasheet

DirectRFQ

P6SMB68CA

Eaton - Electronics DivisionIn Stock: 1480P6SMB68CA Datasheet

MFR RecommendedRFQ

P6SMB68CA

Eaton - Electronics DivisionIn Stock: 1480P6SMB68CA Datasheet

MFR RecommendedRFQ

SM6T68CA

STMicroelectronicsIn Stock: 31895SM6T68CA Datasheet

MFR RecommendedRFQ

SM6T68CAY

STMicroelectronicsIn Stock: 162885SM6T68CAY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6SMB68CA-M3/5B are grouped based on strict electrical parameter matching within the TVS diode category. The primary substitution criteria are:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 58.1V
• Voltage - Breakdown (Min): 64.6V
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Acceptable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: Substitutes may vary within application tolerance
• Current - Peak Pulse: Substitutes may vary based on pulse waveform definition (10/1000µs vs 8/20µs)
• Operating Temperature Range: Minimum -55°C acceptable (vs -65°C on main part)
• Packaging Format: Tape & Reel (TR) or Cut Tape (CT) acceptable alternatives to Tape & Box (TB)

Parameter Comparison

Engineering Selection Recommendations

P6SMB68CA-E3/52 (Vishay): Direct electrical equivalent with identical voltage and current specifications. Differs only in packaging format (Cut Tape & Digi-Reel vs Tape & Box). Recommended for applications requiring reel-based component handling or when Tape & Box format is unavailable. Maintains identical operating temperature range and RoHS3 compliance.

SM6T68CA (STMicroelectronics): Electrically compatible with matching reverse standoff and breakdown voltages. Clamping voltage is higher (121V vs 92V) and peak pulse current specification uses different waveform definition (8/20µs vs 10/1000µs). Operating temperature minimum is -55°C (vs -65°C). Suitable for applications where higher clamping voltage is acceptable and lower temperature operation below -55°C is not required. ROHS3 compliant.

SM6T68CAY (STMicroelectronics): Electrically equivalent to SM6T68CA with additional automotive qualification (AEC-Q101). Recommended for automotive applications requiring grade certification. Maintains all electrical parameters and RoHS3 compliance. Higher inventory availability (162,800 units) compared to other substitutes.

All substitute parts maintain the same package format (DO-214AA, SMB), surface-mount configuration, and power dissipation rating (600W).

Frequently Asked Questions (FAQ)

Q: Can P6SMB68CA-E3/52 be used as a direct replacement for P6SMB68CA-M3/5B?

A: Yes. Both parts are manufactured by Vishay and share identical electrical specifications including reverse standoff voltage (58.1V), breakdown voltage (64.6V), clamping voltage (92V), and peak pulse current (6.5A). The only difference is packaging format: P6SMB68CA-E3/52 uses Cut Tape & Digi-Reel format while P6SMB68CA-M3/5B uses Tape & Box format. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between SM6T68CA and P6SMB68CA-M3/5B?

A: Both parts have identical reverse standoff voltage (58.1V) and breakdown voltage (64.6V), making them electrically compatible for overvoltage protection thresholds. However, SM6T68CA has a higher clamping voltage (121V vs 92V) and uses a different peak pulse current specification (33A at 8/20µs vs 6.5A at 10/1000µs). The operating temperature minimum is -55°C instead of -65°C. These differences mean SM6T68CA provides different transient response characteristics and is suitable only when higher clamping voltage is acceptable for the application.

Q: Is SM6T68CAY suitable for automotive applications?

A: Yes. SM6T68CAY carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. It maintains the same electrical parameters as SM6T68CA (58.1V reverse standoff, 64.6V breakdown, 121V clamping) and is ROHS3 compliant. Inventory availability is significantly higher (162,800 units) compared to other substitutes.

Q: Can I use these substitutes interchangeably in my circuit?

A: Substitution depends on your specific circuit requirements. P6SMB68CA-E3/52 is a direct replacement. SM6T68CA and SM6T68CAY require circuit analysis because they have higher clamping voltage (121V vs 92V), which affects transient suppression characteristics. Verify that the higher clamping voltage is acceptable for your protected circuit before substitution.

Q: What does the packaging format difference mean for assembly?

A: P6SMB68CA-M3/5B comes in Tape & Box format suitable for manual or small-batch assembly. P6SMB68CA-E3/52, SM6T68CA, and SM6T68CAY use Cut Tape & Digi-Reel format optimized for automated pick-and-place assembly. Both formats use the same DO-214AA (SMB) physical package and are compatible with standard surface-mount assembly equipment.

Q: Are all these parts RoHS compliant?

A: Yes. All listed parts (P6SMB68CA-M3/5B, P6SMB68CA-E3/52, SM6T68CA, and SM6T68CAY) are ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life). All are REACH unaffected and classified as EAR99 for export purposes.