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Vishay General Semiconductor - Diodes Division 1.5SMC6.8A-M3/57T
- Part No.:
- 1.5SMC6.8A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC6.8A-M3/57T.pdf
- Description:
- TVS DIODE 5.8VWM 10.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,365
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Product details
Overview
1.5SMC6.8A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 6.8 V breakdown voltage (VBR = 6.45–7.14 V at IT = 10 mA), 5.8 V stand-off voltage (VWM), clamps to ≤10.5 V at 143 A peak pulse current (IPPM), and delivers 1500 W peak pulse power with a 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the 1.5SMC6.8A-M3/57T datasheet, 1.5SMC6.8A-M3/57T pinout, 1.5SMC6.8A-M3/57T application, or 1.5SMC6.8A-M3/57T equivalent, this page provides verified electrical parameters, SMC (DO-214AB) package details, polarity marking guidance, thermal derating curves, and AEC-Q101-qualified alternatives for automotive-grade design-in.
Technical Context
This unidirectional TVS operates as a clamping device triggered by transient overvoltages exceeding its reverse stand-off voltage (5.8 V). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1000 µA at VWM), while the low incremental surge resistance enables fast energy absorption during ESD or lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and exhibits a positive temperature coefficient of VBR (+0.057 %/°C), supporting predictable voltage drift across operating conditions. Mounting on 8.0 mm × 8.0 mm copper pads per terminal is required to sustain full 1500 W pulse rating per JEDEC JESD22-A114 test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 6.45 V / 7.14 V at 10 mA - defines precise conduction onset threshold under standardized test current |
| VWM | 5.8 V - maximum continuous reverse voltage before significant leakage; sets safe operating margin below breakdown |
| IPPM | 143 A (10/1000 µs) - peak surge current it safely clamps without failure; determines protection level against IEC 61000-4-5 surges |
| VC | ≤10.5 V at IPPM - clamped voltage seen by protected circuit; directly limits stress on downstream ICs or MOSFETs |
| PPPM | 1500 W - peak pulse power handling capacity; validates suitability for high-energy transients in automotive and industrial environments |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood or enclosed industrial enclosures |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient; informs PCB copper area requirements for sustained power dissipation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode identified by a single band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe lightning-induced surges per IEC 61000-4-5 Level 4 (4 kV/2 Ω) |
| Low clamping voltage (VC ≤ 10.5 V) | Ensures downstream 5 V logic or microcontrollers remain within absolute maximum ratings during clamping |
| Glass-passivated chip junction | Provides stable, repeatable breakdown characteristics and long-term reliability under repetitive surge stress |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow; supports standard SMT assembly without special handling |
| AEC-Q101 qualified variant available | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground to limit transient excursions. Use Value: Clamps 12 V automotive supply transients to ≤10.5 V, preserving integrity of 5 V tolerant transceiver inputs and preventing latch-up. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting induced spikes before they reach optocoupler or Schmitt-trigger input stages. Use Value: Withstands 1500 W pulses while maintaining <1000 µA leakage at 5.8 V, ensuring no false triggering during normal 24 V operation. |
| DC Power Rail Surge Suppression | USB/Serial Port ESD Protection |
Use Scenario: Secondary-level protection on 5 V or 3.3 V DC-DC output rails feeding sensitive MCU or memory subsystems. IC Role / Device Role / Timing Role: Fast-response clamping element placed after primary filter inductor to absorb residual transients. Use Value: Sub-10 ns response time and ≤10.5 V clamping prevent brownout or reset events caused by board-level coupling. |
Use Scenario: Board-level ESD safeguard on RS-232, RS-485, or USB VBUS lines in industrial gateways and HMI panels. IC Role / Device Role / Timing Role: Low-capacitance unidirectional suppressor limiting voltage overshoot during ±8 kV contact discharge events. Use Value: Meets IEC 61000-4-2 Level 4 (±8 kV contact) with minimal signal distortion due to low dynamic impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A-M3/57T | Lower PPPM (600 W), same VBR/VWM, SMB (DO-214AA) package - 30% smaller footprint, lower surge capacity | Better suited for space-constrained consumer electronics where 600 W surge margin suffices | Select when PCB area is critical and surge threat level is limited to IEC 61000-4-5 Level 2 (1 kV) |
| 1.5SMC6.8AHE3_A/H | Identical electrical specs and SMC package; RoHS-compliant commercial grade (E3 suffix) vs. halogen-free (M3); same 850-unit reel packaging | No functional difference; selected for non-automotive commercial designs requiring standard RoHS compliance | Choose for cost-sensitive industrial applications where halogen-free material specification is not mandated |
Compared with 1.5SMC6.8A-M3/57T, SMBJ6.8A-M3/57T trades surge robustness for compactness, while 1.5SMC6.8AHE3_A/H offers identical protection performance with standard RoHS compliance - enabling selection based on mechanical layout constraints or material compliance requirements rather than electrical capability.
Availability
1.5SMC6.8A-M3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, DC power rail surge suppression, and USB/serial port ESD protection requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for 1.5SMC6.8A-M3/57T 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, power efficiency, and automotive qualification.
The 1.5SMC Series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against lightning, load dump, and ESD is mission-critical.
FAQ
What is the breakdown voltage tolerance of the 1.5SMC6.8A-M3/57T?
The 1.5SMC6.8A-M3/57T has a specified breakdown voltage range of 6.45 V to 7.14 V at a test current of 10 mA. This ±5% tolerance ensures consistent clamping behavior across production lots and supports reliable design margins for 5 V systems. The value is measured per ANSI/IEEE C62.35 standards and validated during 100% production testing.
Is the 1.5SMC6.8A-M3/57T suitable for automotive applications?
The 1.5SMC6.8A-M3/57T itself is a commercial-grade halogen-free part; however, its direct variant 1.5SMC6.8AHM3_A/H is AEC-Q101 qualified. For automotive use, engineers should specify the HM3 suffix with appropriate revision code (e.g., _A) to ensure qualification for under-hood and ADAS applications. The 1.5SMC6.8A-M3/57T shares identical electrical specs but lacks formal automotive stress validation.
How does the 1.5SMC6.8A-M3/57T compare to bidirectional TVS diodes like 1.5SMC6.8CA-M3/57T?
The 1.5SMC6.8A-M3/57T is unidirectional and protects only against reverse-polarity transients, with cathode marked for correct orientation. In contrast, 1.5SMC6.8CA-M3/57T is bidirectional and symmetric - suitable for AC lines or differential signals where polarity reversal may occur. Both share identical VBR, VC, and PPPM, but the unidirectional version offers lower leakage at VWM and is preferred for DC rail protection.
What PCB layout guidelines apply to the 1.5SMC6.8A-M3/57T to achieve full 1500 W rating?
To sustain the full 1500 W peak pulse rating, the 1.5SMC6.8A-M3/57T must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per Vishay Document 88303. Smaller pads reduce thermal dissipation and cause premature failure under repeated surges. Trace inductance between TVS and protected node must also be minimized - ideally <2 mm - to preserve clamping speed.
Does the 1.5SMC6.8A-M3/57T require derating at elevated ambient temperatures?
Yes - the 1.5SMC6.8A-M3/57T follows standard thermal derating: above 25 °C ambient, its peak pulse power must be reduced linearly per Figure 2 in Vishay Document 88303, reaching zero at +150 °C junction temperature. At 85 °C ambient, the usable PPPM drops to approximately 1100 W. Designers must calculate worst-case junction temperature using RθJA = 75 °C/W and actual power dissipation.
1.5SMC6.8A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.8V
- Voltage - Breakdown (Min):
- 6.45V
- Voltage - Clamping (Max) @ Ipp:
- 10.5V
- Current - Peak Pulse (10/1000µs):
- 143A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC6.8A-M3/57T FAQ
1.How can I place an order for 1.5SMC6.8A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC6.8A-M3/57T 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 1.5SMC6.8A-M3/57T reliable?
The price and inventory of 1.5SMC6.8A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC6.8A-M3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC6.8A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC6.8A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC6.8A-M3/57T?
1.5SMC6.8A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC6.8A-M3/57T 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 1.5SMC6.8A-M3/57T?
For technical support, including 1.5SMC6.8A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC6.8A-M3/57T requirements.
6.How does Aetrix verify that 1.5SMC6.8A-M3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC6.8A-M3/57T 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 1.5SMC6.8A-M3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC6.8A-M3/57T?
All 1.5SMC6.8A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC6.8A-M3/57T, 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 1.5SMC6.8A-M3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC6.8A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC6.8A-M3/57T Tags
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