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Vishay General Semiconductor - Diodes Division SM6T68CAHM3/I
- Part No.:
- SM6T68CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CAHM3/I.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,294
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Product details
Overview
SM6T68CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 68 V breakdown voltage (VBR = 64.6–71.4 V), 58.1 V stand-off voltage (VWM), 92.0 V max clamping voltage (VC) at 6.5 A, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive sensor protection.
For engineers reviewing the SM6T68CAHM3/I datasheet, SM6T68CAHM3/I pinout, SM6T68CAHM3/I application, or SM6T68CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.32), halogen-free RoHS compliance, MSL Level 1 rating, and suitability for CAN/LIN bus line protection in harsh environments.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VWM, and VC specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and robust surge handling under repetitive transients.
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The device meets JESD201 Class 2 whisker resistance and is qualified per AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - Ensures consistent breakdown initiation across production lots and temperature range |
| VWM | 58.1 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V @ 6.5 A (10/1000 μs) - Clamps induced surges to safe levels for downstream ICs like microcontrollers or transceivers |
| PPPM | 600 W - Sustains high-energy transients such as ISO 7637-2 Pulse 1/2a/5a without failure |
| TJ max | +150 °C - Supports operation in engine control units and powertrain modules |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly and IPC-7351B standard pad layout |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTOL, TC, and UHAST testing |
| MSL Level | Level 1 (260 °C peak reflow) - No moisture sensitivity concerns; no baking required prior to SMT |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Matte tin-plated leads, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Conducts during negative-going surges; connects to protected line or ground reference |
| Cathode | Transient current entry point (positive polarity) | Conducts during positive-going surges; connects to protected line or ground reference |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., CAN H/L, LIN bus) without polarity constraints |
| 600 W peak pulse power (10/1000 μs) | Withstands automotive load dump and inductive switching events per ISO 7637-2 without degradation |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and automotive material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on protected ICs while maintaining margin above VWM |
| MSL Level 1 rating | Eliminates pre-reflow baking and simplifies manufacturing flow for high-volume automotive PCB assembly |
Applications
| Automotive Sensor Protection | CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting pressure, temperature, and position sensors in engine management systems exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor signal line and chassis ground. Use Value: Limits transient excursions to ≤92.0 V, preventing latch-up or gate oxide damage in analog front-end amplifiers and ADC inputs. | Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042, SN65HVD230) against ESD (IEC 61000-4-2 ±15 kV) and fast transients (ISO 16750-2). IC Role / Device Role / Timing Role: Low-capacitance TVS connected across CAN_H and CAN_L differential pair. Use Value: Maintains signal integrity with <10 pF junction capacitance at zero bias, avoiding bit error rate degradation at 1 Mbps. |
| LIN Bus Node Protection | Industrial I/O Module Protection |
Use Scenario: Shielding LIN slave nodes (e.g., door module actuators) from battery supply transients and electrostatic discharge during service. IC Role / Device Role / Timing Role: Bidirectional suppressor tied between LIN bus line and local ground plane. Use Value: Provides fail-safe operation down to -65 °C and up to +150 °C junction temperature, meeting automotive cold-cranking and thermal soak requirements. | Use Scenario: Protecting 24 V digital input channels in PLC I/O modules subjected to field wiring surges and inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS placed at connector interface before optocoupler or Schmitt trigger input stage. Use Value: Withstands 600 W pulses without derating at ambient temperatures up to +85 °C, ensuring long-term reliability in factory automation cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68CA | Same VBR range (64.6–71.4 V), but lower PPPM = 400 W; SMA package (larger footprint, higher RθJA = 125 °C/W) | Not AEC-Q101 qualified; suitable for commercial industrial use only | Select when cost sensitivity outweighs automotive qualification and thermal performance needs |
| 1.5KE68CA | Higher PPPM = 1500 W, axial DO-201 package; larger size, manual assembly only; VC = 112 V @ 13.2 A | Used in legacy power supply inputs; not suitable for high-density automotive PCBs | Select only for non-SMT applications requiring higher energy absorption and where board space permits |
Compared with SMAJ68CA and 1.5KE68CA, SM6T68CAHM3/I delivers optimal balance of AEC-Q101 qualification, SMB footprint density, 600 W surge capacity, and low clamping voltage-making it the preferred choice for modern automotive electronics where space, reliability, and manufacturability are critical.
Availability
SM6T68CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN/LIN bus protection, and industrial 24 V I/O modules requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SM6T68CAHM3/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, halogen-free construction, and optimized clamping performance for signal-line protection.
FAQ
What is the breakdown voltage tolerance for SM6T68CAHM3/I?
The SM6T68CAHM3/I has a specified breakdown voltage (VBR) range of 64.6 V to 71.4 V at test current IT = 1.0 mA, representing a ±5% tolerance around the nominal 68 V rating. This tight distribution ensures predictable clamping behavior across temperature and production batches, critical for automotive safety-critical circuits.
Is SM6T68CAHM3/I suitable for protecting CAN FD networks operating at 5 Mbps?
Yes, SM6T68CAHM3/I is suitable for CAN FD protection due to its low junction capacitance (<10 pF at zero bias) and fast response time (<1 ns), which preserve signal edge integrity at high data rates. Its bidirectional symmetry and 92.0 V clamping voltage provide robust immunity against ESD and fast transients without distorting differential waveforms.
Does SM6T68CAHM3/I require a heatsink for 600 W pulse handling?
No, SM6T68CAHM3/I does not require an external heatsink for single 10/1000 μs pulses. Its thermal design relies on short-duration energy dissipation; the 600 W rating assumes transient conditions-not continuous operation. For repetitive surges, PCB copper area (0.2" × 0.2" pads per terminal) provides sufficient thermal mass and conduction path.
How does the HM3 suffix affect the environmental compliance of SM6T68CAHM3/I?
The HM3 suffix indicates SM6T68CAHM3/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards. This makes it compliant with automotive OEM material declarations (e.g., IMDS, CAMDS) and end-of-life recycling requirements.
Can SM6T68CAHM3/I replace SM6T68A in a bidirectional circuit?
No-SM6T68A is unidirectional and lacks symmetrical clamping. Using it in place of SM6T68CAHM3/I would leave the circuit unprotected during negative transients. The "CA" suffix is mandatory for bidirectional operation; SM6T68CAHM3/I must be used where AC-coupled or differential signals require dual-polarity suppression.
SM6T68CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T68CAHM3/I FAQ
1.How can I place an order for SM6T68CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CAHM3/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 SM6T68CAHM3/I reliable?
The price and inventory of SM6T68CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM6T68CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CAHM3/I?
SM6T68CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CAHM3/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 SM6T68CAHM3/I?
For technical support, including SM6T68CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CAHM3/I requirements.
6.How does Aetrix verify that SM6T68CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T68CAHM3/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 SM6T68CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM6T68CAHM3/I?
All SM6T68CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CAHM3/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 SM6T68CAHM3/I part is unused and in its original packaging.
Return procedure for SM6T68CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CAHM3/I Tags
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