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Vishay General Semiconductor - Diodes Division SM6T68AHE3/5B
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- Part No.:
- SM6T68AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHE3/5B.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,933
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Product details
Overview
SM6T68AHE3/5B 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 64.6 V minimum breakdown voltage (VBR), 58.1 V standoff voltage (VWM), 92.0 V maximum clamping voltage at 6.5 A (VC), 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T68AHE3/5B datasheet, SM6T68AHE3/5B pinout, SM6T68AHE3/5B application, or SM6T68AHE3/5B 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 standard PCB pad layouts.
Technical Context
The SM6T68AHE3/5B operates as a unidirectional silicon avalanche diode, leveraging glass-passivated junction technology to deliver precise reverse standoff and sharp breakdown characteristics. Its clamping action begins at VBR = 64.6–71.4 V (tested at 1 mA), limiting transient voltages to ≤92.0 V at 6.5 A peak pulse current (10/1000 μs).
Thermally, it supports operation from −65 °C to +150 °C junction temperature, with RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable performance on 5.0 mm × 5.0 mm copper pads per terminal. It meets MSL Level 1 (260 °C reflow peak) and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - Precise avalanche onset range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - Clamped voltage during worst-case surge; determines protected circuit's overvoltage ceiling. |
| PPPM | 600 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IR @ VWM | 1.0 μA - Reverse leakage at rated standoff; negligible power loss and minimal impact on high-impedance sensing nodes. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive environments. |
| Package | SMB (DO-214AA) - Standard surface-mount outline with 0.220" body length; compatible with IPC-7351B footprint. |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by a band on the body. 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 |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge or ESD events. |
| Cathode | Reverse-biased clamping terminal | Marked with band; connected to higher-potential side; avalanches to clamp transients above VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Glass passivated junction | Enhances long-term stability and moisture resistance; prevents parameter drift under thermal/humidity stress. |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulses), improving clamping fidelity. |
| MSL Level 1 rating | Enables single-reflow assembly without dry-pack or baking; supports high-throughput SMT manufacturing. |
| 600 W peak pulse power | Withstands 10/1000 μs surges up to 6.5 A-meets IEC 61000-4-5 surge immunity requirements for industrial interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp spikes >60 V. Use Value: Limits voltage to ≤92.0 V during 6.5 A surges, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) clamping device on low-current signal paths. Use Value: Maintains signal integrity with <1 μA leakage at 58.1 V, avoiding DC offset or loading errors in precision circuits. |
| Telecom DC Power Input Protection | Consumer USB Power Delivery Interface |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against lightning-induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: Primary clamping element upstream of DC-DC converters. Use Value: Delivers 600 W pulse handling with 92.0 V clamping, reducing need for multi-stage protection schemes. |
Use Scenario: Adding secondary overvoltage protection on USB-C VBUS lines alongside primary OVP ICs. IC Role / Device Role / Timing Role: Fast-response silicon avalanche diode for sub-100 ns transient suppression. Use Value: Responds within nanoseconds to fast ESD events (IEC 61000-4-2 ±15 kV contact), preserving port functionality. |
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, but lower 400 W PPPM; VC = 110 V @ 3.6 A (10/1000 μs); no AEC-Q101 qualification. | Not suitable for automotive under-hood use; limited to commercial-grade industrial or consumer systems. | Select when cost sensitivity outweighs automotive qualification and higher surge margin is unnecessary. |
| SMCJ68AHE3/5B | Higher 1500 W PPPM in larger SMC (DO-214AB) package; same VBR/VC specs; AEC-Q101 qualified. | Requires larger PCB footprint and higher thermal mass; suited for high-energy surge zones (e.g., main power entry). | Choose when system-level surge testing exceeds 600 W requirements or when board layout allows SMC footprint. |
Compared with SMAJ68A-E3/5B and SMCJ68AHE3/5B, the SM6T68AHE3/5B uniquely balances AEC-Q101 compliance, 600 W surge capacity, and compact SMB footprint-making it optimal for space-constrained automotive modules where both reliability and size matter.
Availability
SM6T68AHE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply with full traceability and lifecycle support.
Supply support for SM6T68AHE3/5B 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 protection devices with emphasis on reliability and application-specific performance.
The SM6T Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification and repeatable clamping behavior are mandatory.
FAQ
What is the polarity configuration of the SM6T68AHE3/5B?
The SM6T68AHE3/5B is a unidirectional TVS diode. Its cathode is marked by a visible band on the SMB package body, and it conducts only in the forward direction while clamping reverse transients above its VWM of 58.1 V. This polarity ensures proper integration into DC power rails where ground-referenced surge suppression is required.
Is the SM6T68AHE3/5B qualified for automotive applications?
Yes, the SM6T68AHE3/5B carries AEC-Q101 qualification, confirmed by Vishay's documentation and ordering code suffix "HE3". It undergoes rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD verification-to meet automotive reliability standards for under-hood and chassis-mounted modules.
What is the maximum clamping voltage of the SM6T68AHE3/5B under standard surge conditions?
The SM6T68AHE3/5B clamps to a maximum of 92.0 V when subjected to a 10/1000 μs waveform with a peak pulse current of 6.5 A. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Does the SM6T68AHE3/5B require special PCB layout considerations?
Yes-the SM6T68AHE3/5B achieves rated 600 W pulse power only when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads per terminal. Narrow traces or insufficient copper area increase thermal impedance and reduce effective surge handling, potentially causing premature failure during repetitive transients.
How does the SM6T68AHE3/5B differ from bidirectional variants like SM6T68CAHE3/5B?
The SM6T68AHE3/5B is unidirectional and features a cathode band; SM6T68CAHE3/5B is bidirectional with no polarity marking and symmetric clamping in both directions. The "CA" suffix indicates bidirectional construction, making it suitable for AC lines or differential signal pairs where polarity reversal occurs, unlike the SM6T68AHE3/5B's DC-oriented design.
SM6T68AHE3/5B 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 (SMBJ)
SM6T68AHE3/5B FAQ
1.How can I place an order for SM6T68AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHE3/5B 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 SM6T68AHE3/5B reliable?
The price and inventory of SM6T68AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68AHE3/5B is usually 5 days.
3.What payment methods are accepted for SM6T68AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHE3/5B?
SM6T68AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHE3/5B 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 SM6T68AHE3/5B?
For technical support, including SM6T68AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHE3/5B requirements.
6.How does Aetrix verify that SM6T68AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T68AHE3/5B 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 SM6T68AHE3/5B meets industry standards.
7.What is the process for return or replacement of SM6T68AHE3/5B?
All SM6T68AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHE3/5B, 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 SM6T68AHE3/5B part is unused and in its original packaging.
Return procedure for SM6T68AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68AHE3/5B Tags
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