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Vishay General Semiconductor - Diodes Division SM6T68AHE3_B/H
- Part No.:
- SM6T68AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHE3_B/H.pdf
- Description:
- 600W,68V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
SM6T68AHE3_B/H 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 64.6 V minimum breakdown voltage (VBR), 58.1 V stand-off voltage (VWM), 92.0 V maximum clamping voltage (VC) at 6.5 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T68AHE3_B/H datasheet, SM6T68AHE3_B/H pinout, SM6T68AHE3_B/H application, or SM6T68AHE3_B/H equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, RoHS-compliant AEC-Q101 qualification, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
The SM6T68AHE3_B/H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to deliver precise reverse-breakdown behavior and low dynamic impedance during transient events. Its clamping action begins at VWM = 58.1 V and limits peak line voltage to ≤92.0 V at IPPM = 6.5 A under standardized 10/1000 μs waveform conditions.
Thermally, it exhibits RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 64.6 V - Ensures reliable turn-on above normal operating voltage of 58.1 V DC systems |
| VWM | 58.1 V - Maximum continuous reverse voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V at 6.5 A - Clamps 10/1000 μs surges to protect downstream ICs and MOSFETs |
| PPPM | 600 W - Withstands high-energy transients common in automotive load-dump and inductive switching |
| TJ max | +150 °C - Supports under-hood automotive environments and industrial enclosures |
| AEC-Q101 | Qualified - Meets stress-test requirements for automotive electronic modules |
| Package | SMB (DO-214AA) - Standardized surface-mount footprint compatible with IPC-7351B land pattern |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by black band on one end; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or sensor input); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Handles high-energy transients from automotive load dump and relay coil de-energization |
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Low inductance construction | Minimizes voltage overshoot during fast-rising ESD or lightning-induced surges |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorning or delamination |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 Pulse 1 (−150 V, 2 Ω, 50 ms) and Pulse 5a (load dump up to +60 V). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp negative transients and limit positive overvoltage. Use Value: Limits rail voltage to ≤92.0 V during 6.5 A surge, preventing damage to LDOs, microcontrollers, and CAN transceivers. |
Use Scenario: Safeguarding analog inputs of pressure/temperature sensors connected to 24 V PLC I/O modules exposed to motor switching noise. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt induced transients before reaching op-amp front-end or ADC reference. Use Value: Clamps 10/1000 μs surges to <92 V while maintaining <1 μA leakage at 58.1 V, preserving signal integrity and measurement accuracy. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Protection |
Use Scenario: Secondary-side protection on AC/DC adapters feeding PoE-powered switches subjected to lightning-induced surges on Ethernet lines. IC Role / Device Role / Timing Role: Unidirectional TVS on +12 V bias rail downstream of isolation transformer to absorb coupled energy. Use Value: Absorbs 600 W pulses without degradation, meeting IEC 61000-4-5 Level 4 (4 kV line-earth) immunity requirements. |
Use Scenario: Input-stage transient suppression in USB-C PD adapters where primary-side MOVs cannot fully suppress fast-rising spikes. IC Role / Device Role / Timing Role: TVS placed across bulk capacitor terminals to clamp residual transients after bridge rectifier and X-cap discharge. Use Value: Provides sub-100 ns response time and 92 V clamping to prevent overvoltage failure of primary-side controllers and gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/52 | Same VWM (58 V), but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-energy transients; not AEC-Q101 qualified | Select when board space is constrained and automotive qualification is unnecessary |
| 1.5SMC68A | Same VBR/VC specs, but higher PPPM = 1500 W; larger SMC (DO-214AB) package | Overqualified for 600 W needs; requires larger PCB area and higher IPPM derating margin | Choose only if system-level testing demands >1000 W surge margin or legacy SMC footprint reuse |
Compared with SMAJ64A-E3/52 and 1.5SMC68A, the SM6T68AHE3_B/H delivers optimal balance of AEC-Q101 compliance, 600 W capability, SMB footprint, and 92 V clamping-making it the preferred choice for space-constrained automotive and industrial modules requiring validated reliability.
Availability
SM6T68AHE3_B/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and telecom power supply designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM6T68AHE3_B/H 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, rectifiers, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where voltage spikes from inductive loads, ESD, and lightning coupling must be reliably clamped without degradation.
FAQ
What is the clamping voltage of SM6T68AHE3_B/H at its rated peak pulse current?
The SM6T68AHE3_B/H has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000 μs waveform at IPPM = 6.5 A. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SM6T68AHE3_B/H maintains this clamping performance across its qualified operating temperature range.
Is SM6T68AHE3_B/H suitable for automotive applications?
Yes, SM6T68AHE3_B/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024). It is rated for junction temperatures up to +150 °C and meets MSL Level 1 handling requirements-making it appropriate for engine control units, body control modules, and ADAS power supplies where reliability under thermal and mechanical stress is critical. The SM6T68AHE3_B/H is explicitly designated for automotive use in Vishay's ordering information table.
What does the "HE3" suffix indicate in SM6T68AHE3_B/H?
The "HE3" suffix in SM6T68AHE3_B/H denotes RoHS-compliant construction combined with AEC-Q101 qualification. Per Vishay's mechanical data section, "Base P/NHE3_X" identifies parts that are both RoHS-compliant and AEC-Q101 qualified, where "_X" is the revision code (here "B/H"). This distinguishes SM6T68AHE3_B/H from commercial-grade E3 variants and confirms its suitability for automotive production. The SM6T68AHE3_B/H meets JESD201 Class 2 whisker resistance and 260 °C lead-free reflow requirements.
What is the standoff voltage (VWM) of SM6T68AHE3_B/H, and why does it matter?
The standoff voltage (VWM) of SM6T68AHE3_B/H is 58.1 V-this is the maximum continuous reverse voltage the device can block without exceeding 1 μA leakage current. It ensures the SM6T68AHE3_B/H remains non-conductive during normal operation of a 48 V or 60 V nominal system, avoiding power loss or false triggering. Selecting VWM ≥10–20% above the system's maximum steady-state voltage prevents nuisance conduction while preserving headroom for transient clamping.
How is polarity identified on SM6T68AHE3_B/H?
SM6T68AHE3_B/H is a unidirectional TVS diode, and polarity is marked by a cathode band (black stripe) on the SMB package body. The banded end is the cathode and must be connected toward the protected line (e.g., +12 V rail), while the anode connects to ground or return. This orientation enables reverse-biased clamping during overvoltage events. Bidirectional variants use "CA" suffixes and lack polarity markings; the SM6T68AHE3_B/H does not have "CA" and therefore requires correct orientation during placement.
SM6T68AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T68AHE3_B/H FAQ
1.How can I place an order for SM6T68AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHE3_B/H 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 SM6T68AHE3_B/H reliable?
The price and inventory of SM6T68AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68AHE3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T68AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHE3_B/H?
SM6T68AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHE3_B/H 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 SM6T68AHE3_B/H?
For technical support, including SM6T68AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHE3_B/H requirements.
6.How does Aetrix verify that SM6T68AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T68AHE3_B/H 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 SM6T68AHE3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T68AHE3_B/H?
All SM6T68AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHE3_B/H, 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 SM6T68AHE3_B/H part is unused and in its original packaging.
Return procedure for SM6T68AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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