SM6T68CA-M3/52 Equivalent & Substitute Parts

Part Overview

The SM6T68CA-M3/52 is a Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates in the SM6T series (TransZorb®) and is housed in a DO-214AA (SMB) surface mount package. The device provides transient voltage suppression for general-purpose applications with a reverse standoff voltage of 58.1V and a clamping voltage of 92V at peak pulse current. The part is currently active in production and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters that ensure functional interchangeability in circuit applications.

Substiute Parts

SM6T68CA-M3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 942SM6T68CA-M3/52 Datasheet

Current PartRFQ

P6SMB68CA-E3/52

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

DirectRFQ

1KSMB68CA

Taiwan Semiconductor CorporationIn Stock: 304611KSMB68CA Datasheet

MFR RecommendedRFQ

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

TPSMB68CA

Littelfuse Inc.In Stock: 1246TPSMB68CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SM6T68CA-M3/52 are identified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 58.1V
• Voltage - Clamping (Max) @ Ipp: 92V
• Voltage - Breakdown (Min): 64.6V
• Current - Peak Pulse (10/1000µs): 6.5A (±tolerance acceptable)
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Parts are grouped into two categories:

Category 1: Direct Electrical & Mechanical Equivalents Parts that match all critical voltage parameters, peak pulse current within acceptable tolerance, and identical package specifications. These parts are fully interchangeable without circuit modification.

Category 2: Enhanced Performance Alternatives Parts that maintain identical voltage parameters and package compatibility but offer higher peak pulse current ratings or extended temperature ranges. These parts provide superior performance margins and are suitable for applications requiring enhanced transient suppression capability.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended for 1:1 Replacement): P6SMB68CA-E3/52 from Vishay General Semiconductor - Diodes Division is the primary direct equivalent. This part maintains identical electrical specifications, voltage parameters, current ratings, and package configuration. Both parts are manufactured by the same company and share the same series designation (P6SMB and SM6T are both TransZorb® products). This part is suitable for immediate substitution without design modification.

Alternative with Enhanced Performance: TPSMB68CA from Littelfuse Inc. provides equivalent voltage suppression with marginally higher peak pulse current (6.6A vs. 6.5A) and extended upper operating temperature limit (-65°C to 175°C vs. -65°C to 150°C). This part is AEC-Q101 qualified for automotive applications and maintains full RoHS3 compliance. Selection of this part is appropriate when enhanced temperature performance or automotive-grade reliability is required.

High-Performance Alternative: 1KSMB68CA from Taiwan Semiconductor Corporation offers significantly enhanced transient suppression capability with 10.9A peak pulse current and 1000W peak pulse power rating. This part maintains identical voltage parameters and package compatibility but provides superior performance margins for applications experiencing severe transient events. The extended operating temperature range (-55°C to 175°C) supports demanding thermal environments.

Not Recommended for Direct Substitution: SM6T68CA from STMicroelectronics exhibits a higher clamping voltage (121V vs. 92V) and substantially higher peak pulse current (33A at 8/20µs pulse definition). While the package and voltage standoff specifications match, the different clamping voltage and current characteristics indicate this part is designed for different application requirements and should not be used as a direct substitute without circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can P6SMB68CA-E3/52 be used as a direct replacement for SM6T68CA-M3/52? A: Yes. P6SMB68CA-E3/52 is a direct equivalent with identical voltage parameters (58.1V standoff, 92V clamping), current rating (6.5A), power rating (600W), and DO-214AA SMB package. Both parts are manufactured by Vishay and are fully interchangeable.

Q: What is the difference between SM6T68CA-M3/52 and TPSMB68CA? A: Both parts share identical voltage specifications and package configuration. TPSMB68CA offers a marginally higher peak pulse current (6.6A vs. 6.5A) and extended upper operating temperature (175°C vs. 150°C). TPSMB68CA is AEC-Q101 qualified for automotive applications. Selection depends on whether automotive qualification or extended temperature performance is required.

Q: When should 1KSMB68CA be selected instead of SM6T68CA-M3/52? A: 1KSMB68CA should be selected when the application requires enhanced transient suppression capability. This part provides 10.9A peak pulse current and 1000W peak pulse power compared to 6.5A and 600W in the original part. Voltage parameters remain identical, ensuring circuit compatibility. Use this part when transient events exceed the original part's current handling capability.

Q: Why is SM6T68CA from STMicroelectronics not recommended as a substitute? A: Although SM6T68CA shares the same voltage standoff (58.1V) and package (DO-214AA SMB), it specifies a higher clamping voltage (121V vs. 92V) and substantially higher peak pulse current (33A vs. 6.5A). These differences indicate the part is designed for different circuit requirements. Using this part without circuit re-evaluation may result in inadequate voltage suppression or circuit malfunction.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant and meet REACH requirements. All parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling is required during storage or assembly.

Q: What packaging options are available for these parts? A: All substitute parts are available in DO-214AA (SMB) surface mount package. The main part (SM6T68CA-M3/52) is supplied in Tape & Reel (TR) packaging. P6SMB68CA-E3/52 is available in Cut Tape (CT) & Digi-Reel® format. Verify packaging availability with your supplier based on assembly requirements.

Q: Can these parts be used interchangeably in automotive applications? A: TPSMB68CA is specifically qualified to AEC-Q101 automotive standards. For automotive applications requiring formal qualification documentation, TPSMB68CA is the recommended choice. Other parts may be suitable for automotive use but lack explicit AEC-Q101 qualification in the provided specifications.