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Vishay General Semiconductor - Diodes Division SMCJ8.5A-M3/57T
- Part No.:
- SMCJ8.5A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5A-M3/57T.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
SMCJ8.5A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 14.4 V clamping voltage at 104.2 A surge current and 8.5 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ8.5A-M3/57T datasheet, SMCJ8.5A-M3/57T pinout, SMCJ8.5A-M3/57T application, or SMCJ8.5A-M3/57T equivalent, key selection criteria include unidirectional polarity, 9.44–10.4 V breakdown range at 1 mA, 1.0 μA max reverse leakage at 8.5 V, 75 °C/W junction-to-ambient thermal resistance, and halogen-free RoHS-compliant M3 suffix construction.
Technical Context
The SMCJ8.5A-M3/57T uses a glass-passivated silicon junction optimized for fast response (<1 ns) to ESD and lightning-induced surges. Its low incremental surge resistance ensures stable clamping under 10/1000 μs waveform stress, while its MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
Designed for unidirectional operation, it features cathode band marking and delivers 14.4 V clamping at rated IPPM, with temperature coefficient of 0.073 %/°C for VBR - enabling predictable performance across -55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - verified breakdown threshold defining turn-on precision |
| VC @ IPPM | 14.4 V at 104.2 A - clamping voltage limiting downstream component stress during surge |
| PPPM | 1500 W - peak pulse power handling per 10/1000 μs waveform, critical for IEC 61000-4-5 compliance |
| ID @ VWM | 20 μA - ultra-low leakage ensuring minimal standby power loss in battery-sensitive systems |
| RθJA | 75 °C/W - thermal resistance indicating need for ≥8 mm × 8 mm copper pads for full power derating |
| TJ max | +150 °C - maximum junction temperature supporting under-hood automotive deployment |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL Level 1, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when VWM exceeded |
| Anode | Reference/ground return | Typically tied to system ground plane; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables automated placement on dense PCBs while maintaining 1500 W surge capability |
| Glass-passivated junction | Ensures long-term reliability and stable VBR under thermal cycling and humidity exposure |
| 10/1000 μs waveform rating | Validates robustness against IEC 61000-4-5 Level 4 surge events (4 kV line-earth) |
| AEC-Q101 qualification option | Available in HM3 variant for automotive-grade production; this M3 version is commercial-grade |
| Halogen-free construction | Meets IPC-4101D/21 and EU Directive 2011/65/EU requirements for green manufacturing |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails feeding body control modules and lighting drivers from load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input. Use Value: Clamps 12 V rail spikes to ≤14.4 V, preventing damage to downstream LDOs and microcontrollers without adding series impedance. | Use Scenario: Safeguarding analog output lines of pressure/temperature sensors exposed to motor drive noise. IC Role / Device Role / Timing Role: TVS mounted directly at sensor connector to shunt EFT bursts before reaching ADC front-end. Use Value: Limits induced transients to <14.4 V, preserving signal integrity and avoiding ADC saturation or latch-up in 3.3 V systems. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters subjected to mains switching surges. IC Role / Device Role / Timing Role: Unidirectional clamp on +5 V or +12 V output rail prior to USB or PCIe interface. Use Value: Absorbs 1500 W pulses without degradation, maintaining output regulation and preventing USB controller reset. | Use Scenario: Primary protection for Ethernet PHY power pins against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: TVS placed on VDDIO rail of Gigabit Ethernet transceivers. Use Value: Fast clamping (<1 ns) limits voltage overshoot to safe levels for 2.5 V/3.3 V PHY I/O structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-M3 | Lower PPPM (600 W), same VWM/VC, SMB (DO-214AA) package | Reduced surge margin; suitable only for sub-IEC Level 3 environments | Select when board space is constrained and surge threat level is limited to ESD and minor inductive spikes. |
| SMCJ8.5CA-M3/57T | Bidirectional variant; identical VWM, VBR, and VC, but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs | Choose for RS-485, CAN bus, or audio line protection where bidirectional transients dominate. |
Compared with SMBJ8.5A-M3 and SMCJ8.5CA-M3/57T, the SMCJ8.5A-M3/57T provides higher surge capacity in unidirectional configuration, making it optimal for DC power rail protection where polarity is fixed and high-energy threats exist.
Availability
SMCJ8.5A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and consumer power adapter input stage applications requiring stable component supply and halogen-free compliance.
Supply support for SMCJ8.5A-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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, delivering standardized 1500 W surge capability across 5.0 V to 188 V stand-off voltages for automotive, industrial, and telecom infrastructure use.
FAQ
What is the breakdown voltage range of the SMCJ8.5A-M3/57T?
The SMCJ8.5A-M3/57T has a guaranteed breakdown voltage range of 9.44 V to 10.4 V at 1 mA test current, measured per ANSI/IEEE C62.35 standards. This tight VBR tolerance ensures consistent turn-on behavior across production lots and supports precise overvoltage protection design in the SMCJ8.5A-M3/57T's target applications.
Is the SMCJ8.5A-M3/57T suitable for automotive applications?
The SMCJ8.5A-M3/57T is commercial-grade with halogen-free RoHS compliance (M3 suffix) and meets MSL Level 1. While not AEC-Q101 qualified itself, the identical SMCJ8.5A-HM3/57T variant is qualified. Engineers may use the SMCJ8.5A-M3/57T in non-safety-critical automotive subsystems where qualification is not mandated, but must verify system-level compliance separately.
How does the SMCJ8.5A-M3/57T compare to the SMBJ8.5A-M3 in terms of surge capability?
The SMCJ8.5A-M3/57T delivers 1500 W peak pulse power, more than double the 600 W rating of the SMBJ8.5A-M3. Both share identical VWM (8.5 V) and VC (14.4 V), but the SMCJ8.5A-M3/57T's larger SMC package enables higher surge current handling (104.2 A vs. ~42 A), making it appropriate for IEC 61000-4-5 Level 4 testing where the SMBJ8.5A-M3 falls short.
What is the thermal resistance of the SMCJ8.5A-M3/57T and how does it affect layout?
The SMCJ8.5A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To sustain full 1500 W surge capability, PCB layout must provide minimum pad area and thermal vias; insufficient copper will cause premature thermal shutdown or parametric shift during repeated surges.
Does the SMCJ8.5A-M3/57T have polarity marking, and how is it identified?
Yes - the SMCJ8.5A-M3/57T is unidirectional and features a visible cathode band on the SMC (DO-214AB) package body. The banded end is the cathode and must be connected toward the protected line (e.g., VIN), while the anode connects to ground. No marking appears on bidirectional variants like SMCJ8.5CA-M3/57T, confirming polarity distinction is intentional and functionally critical for correct circuit integration.
SMCJ8.5A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 104.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ8.5A-M3/57T FAQ
1.How can I place an order for SMCJ8.5A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5A-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 SMCJ8.5A-M3/57T reliable?
The price and inventory of SMCJ8.5A-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 SMCJ8.5A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ8.5A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5A-M3/57T?
SMCJ8.5A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5A-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 SMCJ8.5A-M3/57T?
For technical support, including SMCJ8.5A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5A-M3/57T requirements.
6.How does Aetrix verify that SMCJ8.5A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5A-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 SMCJ8.5A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ8.5A-M3/57T?
All SMCJ8.5A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5A-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 SMCJ8.5A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ8.5A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5A-M3/57T Tags
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