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Vishay General Semiconductor - Diodes Division SM6T68AHM3/I
- Part No.:
- SM6T68AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHM3/I.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,904
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Product details
Overview
SM6T68AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 58.1 V stand-off voltage (VWM), 64.6–71.4 V breakdown voltage (VBR) at 1 mA, 92.0 V maximum clamping voltage (VC) at 6.5 A (10/1000 μs), 600 W peak pulse power, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T68AHM3/I datasheet, SM6T68AHM3/I pinout, SM6T68AHM3/I application, or SM6T68AHM3/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, halogen-free RoHS compliance, and suitability for automotive-grade ESD/surge protection in DC power rails and sensor interfaces.
Technical Context
The SM6T68AHM3/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to deliver fast response (<1 ns) to transient overvoltages. Its clamping action begins at VWM = 58.1 V and fully engages at VBR = 64.6–71.4 V (1 mA test current), limiting peak line voltage to ≤92.0 V at 6.5 A IPPM.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C. The device is rated for 100 A non-repetitive forward surge (IFSM, 10 ms half-sine) and meets MSL Level 1 reflow compatibility (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - Maximum continuous reverse operating voltage before significant leakage; sets threshold for normal DC rail operation. |
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - Ensures predictable avalanche onset across production lot; critical for timing of clamping activation. |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - Defines worst-case protected-line voltage during standard surge event; determines downstream IC survivability. |
| PPPM | 600 W - Peak pulse power handling capability under standardized 10/1000 μs waveform; defines transient energy absorption limit. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.220" x 0.130" footprint; compatible with automated pick-and-place and reflow soldering. |
| AEC-Q101 | Qualified - Validated for automotive reliability per stress test requirements; supports PPAP documentation for Tier-1 suppliers. |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and cathode band marking on unidirectional variants. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); recommended pad layout: 5.59 mm × 1.52 mm per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point in reverse-biased protection configuration | Connected to protected line (e.g., 12 V rail); clamps to cathode when voltage exceeds VWM. |
| Anode | Reference/ground return path | Connected to system ground or low-impedance return; completes clamping current path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| 600 W peak pulse power (10/1000 μs) | Provides robust protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events in automotive ECUs. |
| AEC-Q101 qualified (HM3 suffix) | Validates device for automotive under-hood applications including engine control, body electronics, and ADAS sensors. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and supports lead-free reflow assembly without compromising thermal performance. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in vehicle body control modules against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VIN and GND, activated within nanoseconds upon overvoltage detection. Use Value: Limits transient voltage to ≤92.0 V during 6.5 A surge, preventing latch-up or permanent damage to 5 V/3.3 V LDOs and MCU cores. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of industrial pressure sensors exposed to field wiring surges. IC Role / Device Role / Timing Role: Line-side transient suppressor mounted at connector entry point, shunting surge energy before reaching precision DAC or op-amp circuitry. Use Value: Maintains signal integrity by clamping induced spikes to <92.0 V while exhibiting <1 μA leakage at 58.1 V, avoiding baseline drift. |
| Consumer USB Power Input Protection | Telecom DC Feeder Protection |
Use Scenario: Securing 5 V USB-C power input stages in smart home hubs against ESD and hot-plug overshoot. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VBUS line, coordinated with upstream fuse and secondary filtering. Use Value: Responds in <1 ns to ±15 kV contact ESD (IEC 61000-4-2), limiting excursion to safe levels without affecting steady-state 5 V regulation. | Use Scenario: Protecting -48 V DC telecom power feeds in remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used with polarity-aware rectification for negative rail clamping. Use Value: Withstands repeated 600 W surges while maintaining VWM = 58.1 V standoff-compatible with -48 V nominal systems using inverted mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68A-E3/5B | Same SMB package, 68 V VBR, but only commercial-grade (not AEC-Q101 qualified); VC = 110 V @ 5.5 A. | Lacks automotive qualification; suitable for industrial/commercial designs without PPAP requirements. | Select SMAJ68A-E3/5B where AEC-Q101 is not mandated and higher clamping voltage is acceptable. |
| 1.5SMC68A | Higher-power SMC package (1500 W PPPM), same VBR range, but larger footprint (7.11 mm × 6.22 mm) and no AEC-Q101 option in standard grade. | Used where surge energy exceeds 600 W or board space allows larger package; not drop-in compatible. | Choose 1.5SMC68A only when surge threat level requires >600 W rating and PCB layout permits SMC footprint. |
Compared with SMAJ68A-E3/5B and 1.5SMC68A, the SM6T68AHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and SMB footprint with 600 W capability-making it the preferred choice for space-constrained automotive modules requiring certified reliability.
Availability
SM6T68AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power input protection requiring stable component supply and full traceability.
Supply support for SM6T68AHM3/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and high-volume manufacturability.
The SM6T Series is engineered specifically for transient voltage suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, consistency, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SM6T68AHM3/I at its rated peak pulse current?
The SM6T68AHM3/I has a maximum clamping voltage (VC) of 92.0 V at 6.5 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SM6T68AHM3/I maintains this clamping performance across its qualified operating temperature range.
Is SM6T68AHM3/I suitable for automotive applications?
Yes, SM6T68AHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is validated for use in engine control units, body electronics, and ADAS subsystems where reliability under thermal cycling, vibration, and electrical stress is required. The SM6T68AHM3/I meets all applicable stress tests per AEC-Q101 Rev D.
What does the "HM3" suffix mean in SM6T68AHM3/I?
The "HM3" suffix in SM6T68AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3" or "M3") and confirms compliance with automotive reliability standards. The SM6T68AHM3/I is intended for production automotive programs requiring PPAP documentation and long-term supply assurance.
How does SM6T68AHM3/I differ from bidirectional TVS diodes like SM6T68CA?
The SM6T68AHM3/I is unidirectional and features a cathode band marking; it conducts only in reverse breakdown, making it suitable for DC line protection with defined polarity. In contrast, SM6T68CA is bidirectional, symmetric in both directions, and lacks polarity marking-used where AC signals or undefined polarity require clamping in either direction. The SM6T68AHM3/I cannot substitute for SM6T68CA without circuit redesign.
What is the thermal resistance of SM6T68AHM3/I from junction to ambient?
The SM6T68AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard PCB layout per Vishay's recommended pad dimensions and is critical for calculating maximum power dissipation at elevated ambient temperatures. The SM6T68AHM3/I also specifies RθJL = 20 °C/W for junction-to-lead conduction.
SM6T68AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T68AHM3/I FAQ
1.How can I place an order for SM6T68AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHM3/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM6T68AHM3/I reliable?
The price and inventory of SM6T68AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6T68AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHM3/I?
SM6T68AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHM3/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM6T68AHM3/I?
For technical support, including SM6T68AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHM3/I requirements.
6.How does Aetrix verify that SM6T68AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T68AHM3/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM6T68AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6T68AHM3/I?
All SM6T68AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHM3/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM6T68AHM3/I part is unused and in its original packaging.
Return procedure for SM6T68AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68AHM3/I Tags
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