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Vishay General Semiconductor - Diodes Division SM6T68CAHM3_B/H
- Part No.:
- SM6T68CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CAHM3_B/H.pdf
- Description:
- 600W,68V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,434
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Product details
Overview
SM6T68CAHM3_B/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 68 V breakdown voltage (VBR = 64.6–71.4 V at 1 mA), 58.1 V stand-off voltage (VWM), 92 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 SM6T68CAHM3_B/H datasheet, SM6T68CAHM3_B/H pinout, SM6T68CAHM3_B/H application, or SM6T68CAHM3_B/H equivalent, key selection factors include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.33), halogen-free RoHS-compliant construction, MSL Level 1 rating, and suitability for automotive-grade ESD/surge protection in sensor interfaces and power rails.
Technical Context
The SM6T68CAHM3_B/H operates as a bidirectional avalanche diode with symmetrical clamping in both polarities, enabling robust protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM), while the low-inductance SMB package supports fast response to ESD (IEC 61000-4-2) and surge (IEC 61000-4-5) events.
Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, allowing reliable operation up to TJ = 150 °C. The device is rated for non-repetitive peak pulse current of 6.5 A (10/1000 μs) and withstands 100 A forward surge (10 ms half-sine) only in unidirectional variants - not applicable here due to bidirectional configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise avalanche onset window for repeatable clamping threshold |
| VWM | 58.1 V - maximum continuous reverse voltage before significant leakage begins; sets operating margin below breakdown |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - clamping voltage seen by protected circuit during worst-case surge event |
| PPPM | 600 W - peak transient energy absorption capacity under standardized 10/1000 μs waveform |
| ID @ VWM | <1 μA - ultra-low reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max. | +150 °C - enables deployment in under-hood automotive environments and industrial enclosures without derating |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD per AEC standard |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak). Cathode/anode terminals are unmarked for bidirectional devices; polarity is non-applicable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative transients to clamp voltage |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical avalanche junction; conducts during positive transients to clamp voltage |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV surge) protection on 12 V/24 V automotive power rails |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensors |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor supply and ground to limit transients to safe levels for ADC input stages. Use Value: Prevents sensor signal corruption and microcontroller reset during 12 V system surges up to ±100 V, leveraging VC = 92 V and AEC-Q101 qualification. |
Use Scenario: ESD and surge protection on CAN_H/CAN_L differential pair in industrial PLC communication ports. IC Role / Device Role / Timing Role: Symmetrical TVS pair (one per line) referenced to common-mode ground, absorbing common-mode transients. Use Value: Maintains CAN signal integrity during IEC 61000-4-2 contact discharge (±8 kV) and 4-5 surge events without degrading data rate or introducing jitter. |
| Consumer USB Power Delivery | Telecom PoE Interface |
|
Use Scenario: Overvoltage suppression on VBUS line of USB-C PD adapters subjected to hot-plug inductive kickback. IC Role / Device Role / Timing Role: Primary clamping device between VBUS and GND, activated within nanoseconds of transient onset. Use Value: Limits VBUS overshoot to ≤92 V during 5 V/9 V/15 V/20 V PD transitions, preventing damage to buck-boost controllers and port controllers. |
Use Scenario: Secondary surge protection on powered device (PD) side of IEEE 802.3af/at/bt PoE inputs before DC-DC converter. IC Role / Device Role / Timing Role: Bidirectional clamp across PSE-provided DC supply rails to absorb lightning-induced common-mode surges. Use Value: Withstands 600 W transient energy while maintaining <1 μA leakage at 57 V nominal PoE voltage, ensuring low standby loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage 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) | Limited to lower-energy transients (e.g., IEC 61000-4-2 only); unsuitable for ISO 7637-2 Pulse 5a | Select when cost sensitivity outweighs surge margin and board space permits larger SMA footprint |
| 1.5KE68CA | Higher PPPM = 1500 W, axial leaded DO-201 package; VC = 112 V at 13.2 A (10/1000 μs) | Requires through-hole assembly; higher clamping voltage reduces protected IC margin | Choose for legacy through-hole designs needing higher surge rating, accepting larger size and higher VC |
Compared with SMAJ68CA and 1.5KE68CA, the SM6T68CAHM3_B/H delivers optimal balance of compact SMB footprint, 600 W surge handling, low 92 V clamping, and AEC-Q101 qualification - making it the preferred choice for new SMT automotive and industrial designs requiring verified reliability and space efficiency.
Availability
SM6T68CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, and telecom PoE-powered devices requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SM6T68CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SM6T Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and communications systems where ESD, lightning, and switching surge immunity are critical design requirements.
FAQ
What does the "CA" suffix indicate in SM6T68CAHM3_B/H?
The "CA" suffix denotes a bidirectional configuration, meaning the SM6T68CAHM3_B/H provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SM6T68AHM3_B/H), it has no polarity marking and functions identically in either direction - essential for protecting AC-coupled or floating signal paths without orientation concerns.
Is SM6T68CAHM3_B/H suitable for automotive applications?
Yes, SM6T68CAHM3_B/H is AEC-Q101 qualified (indicated by the HM3 suffix), confirming its reliability for automotive use. It meets stringent requirements for temperature cycling, high-temperature reverse bias, and ESD robustness - making it appropriate for engine control units, body electronics, infotainment systems, and ADAS sensor modules operating in ambient temperatures from –40 °C to +125 °C.
What is the maximum clamping voltage of SM6T68CAHM3_B/H under surge conditions?
The SM6T68CAHM3_B/H has a maximum clamping voltage (VC) of 92.0 V at 6.5 A peak pulse current using the 10/1000 μs waveform. This value represents the highest voltage imposed on the protected circuit during a standardized surge event and is critical for ensuring downstream ICs remain within their absolute maximum ratings.
How does the SMB (DO-214AA) package of SM6T68CAHM3_B/H compare to SMA in size and thermal performance?
The SMB package of SM6T68CAHM3_B/H measures 4.57 mm × 3.94 mm × 2.20 mm - approximately 30 % smaller than SMA (DO-214AC). Its RθJA is 100 °C/W (vs. ~130 °C/W for SMA), enabling better power dissipation in dense layouts. The compact size supports automated placement and high-density PCB designs without sacrificing thermal capability.
Does SM6T68CAHM3_B/H require external series impedance for effective protection?
No, SM6T68CAHM3_B/H operates as a shunt protector and does not require external series impedance to function. However, adding a small series resistor or ferrite bead upstream improves current sharing during fast transients and reduces diode stress - especially beneficial in high-speed data lines like CAN or USB where signal integrity must be preserved alongside surge protection.
SM6T68CAHM3_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:
- -
- 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:
- 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)
SM6T68CAHM3_B/H FAQ
1.How can I place an order for SM6T68CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CAHM3_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 SM6T68CAHM3_B/H reliable?
The price and inventory of SM6T68CAHM3_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 SM6T68CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T68CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CAHM3_B/H?
SM6T68CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CAHM3_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 SM6T68CAHM3_B/H?
For technical support, including SM6T68CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CAHM3_B/H requirements.
6.How does Aetrix verify that SM6T68CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T68CAHM3_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 SM6T68CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T68CAHM3_B/H?
All SM6T68CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CAHM3_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 SM6T68CAHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T68CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CAHM3_B/H Tags
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