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Vishay General Semiconductor - Diodes Division SMCJ8.5A-M3/9AT
- Part No.:
- SMCJ8.5A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5A-M3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,640
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Product details
Overview
SMCJ8.5A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping ESD and surge transients on power and signal lines. It features 8.5 V stand-off voltage (VWM), 14.4 V maximum clamping voltage (VC) at 104.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ8.5A-M3/9AT datasheet, SMCJ8.5A-M3/9AT pinout, SMCJ8.5A-M3/9AT application, or SMCJ8.5A-M3/9AT equivalent, key selection criteria include verified unidirectional polarity, halogen-free RoHS-compliant M3 suffix, 150 °C max junction temperature, low incremental surge resistance, and compliance with AEC-Q101 when ordered as HM3 variant.
Technical Context
This device operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and stable clamping under repetitive surge stress. Its breakdown voltage (VBR) is specified at 9.44–10.4 V with 1 mA test current, and it exhibits a positive temperature coefficient of VBR (+0.073 %/°C), enabling predictable thermal behavior in stacked or parallel configurations.
The SMCJ8.5A-M3/9AT is rated for 200 A non-repetitive forward surge current (IFSM) and achieves 6.5 W steady-state power dissipation at TA = 50 °C. Thermal resistance is 75 °C/W junction-to-ambient (RθJA) and 15 °C/W junction-to-lead (RθJL), supporting reliable operation on standard 8 mm × 8 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum reverse stand-off voltage before conduction; defines safe operating range for protected circuitry. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - Confirmed avalanche breakdown window ensuring consistent turn-on threshold. |
| VC @ IPPM | 14.4 V at 104.2 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity. |
| ID @ VWM | 20 μA - Reverse leakage at rated stand-off; ensures minimal quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
Pinout & Package
SMCJ8.5A-M3/9AT uses the SMC (DO-214AB) package: a two-terminal, unidirectional surface-mount device with cathode indicated by a band on the body. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point; completes conduction path during transient clamp event. |
| Cathode | High-side transient input | Connected to protected line (e.g., 12 V rail or sensor output); carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms compliance with JEDEC JS709E and IPC-1752A environmental standards. |
| MSL Level 1 moisture sensitivity | Rated for unlimited floor life at ≤30 °C/85 % RH; no bake required prior to reflow. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (14.4 V / 9.44 V ≈ 1.52), improving clamping efficiency over competing TVS devices. |
| Glass passivated chip junction | Provides stable long-term reliability and reduced parameter drift under thermal cycling and humidity stress. |
| AEC-Q101 qualification option | Available as HM3 variant (e.g., SMCJ8.5AHM3/9AT) for automotive-grade production with full stress test reporting. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 8.5 V. Use Value: Limits clamped voltage to 14.4 V at 104.2 A, preventing damage to downstream LDOs and microcontrollers. |
Use Scenario: Shielding analog outputs of pressure or temperature sensors from ESD events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across sensor output and ground to absorb ±8 kV contact discharge. Use Value: 20 μA leakage at 8.5 V preserves signal integrity in high-impedance sensor bridges without loading error. |
| Telecom DC Power Input Protection | Consumer USB Power Delivery Interface |
|
Use Scenario: Safeguarding PoE-powered switches against induced lightning surges on 48 V input rails. IC Role / Device Role / Timing Role: Primary surge clamp on DC input stage, coordinated with upstream fuse and common-mode choke. Use Value: 1500 W PPPM rating meets IEC 61000-4-5 Ed. 3 requirements for Class B equipment in telecom infrastructure. |
Use Scenario: Adding secondary-level surge suppression on VBUS line of USB-C receptacles in portable monitors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after Type-C controller but before power switch to limit overshoot during hot-plug. Use Value: 14.4 V clamping ensures USB PD 3.0 20 V mode remains within safe margin for internal buck converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-M3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher VC (14.4 V same, but lower IPPM = 27.8 A). | Suitable only for sub-1 kV surge environments; not recommended for automotive load dump or IEC 61000-4-5 Level 4. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ8.5CA-M3 | Bidirectional version with identical VWM (8.5 V), same PPPM (1500 W), but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Choose when protecting bidirectional data lines or ungrounded power domains where reverse polarity transients exist. |
Compared with SMAJ8.5A-M3, the SMCJ8.5A-M3/9AT delivers 3.75× higher surge power handling and superior thermal robustness; versus SMCJ8.5CA-M3, it offers lower capacitance and optimized clamping for DC-biased rails, but lacks reverse-polarity protection.
Availability
SMCJ8.5A-M3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power supply designs requiring stable component supply, halogen-free compliance, and AEC-Q101 upgrade path.
Supply support for SMCJ8.5A-M3/9AT 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, precision, and application-specific qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are critical.
FAQ
What is the clamping voltage of SMCJ8.5A-M3/9AT at its rated peak pulse current?
The SMCJ8.5A-M3/9AT has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 104.2 A using a 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping performance ensures protected circuits remain below critical voltage thresholds during surge events. SMCJ8.5A-M3/9AT maintains this specification across its qualified operating temperature range.
Is SMCJ8.5A-M3/9AT suitable for automotive applications?
SMCJ8.5A-M3/9AT itself is commercial-grade with halogen-free RoHS compliance (M3 suffix), but Vishay offers the AEC-Q101 qualified variant as SMCJ8.5AHM3/9AT. The base SMCJ8.5A-M3/9AT shares identical electrical and thermal characteristics, making it suitable for prototyping and non-safety-critical automotive subsystems. For production deployment in engine control, ADAS, or infotainment modules, the HM3 version must be selected to meet full AEC-Q101 stress testing requirements. SMCJ8.5A-M3/9AT serves as the foundational platform for that qualification path.
What does the "M3" suffix mean in SMCJ8.5A-M3/9AT?
The "M3" suffix in SMCJ8.5A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC JS709E and IPC-1752A material declarations. It denotes matte tin-plated leads, JESD 201 Class 2 whisker resistance, and compliance with Vishay's green initiative standards. This differs from the "E3" suffix (RoHS-compliant but not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free). The M3 designation applies to the entire SMCJ family and is verified per Vishay document 88394. SMCJ8.5A-M3/9AT is fully compatible with lead-free reflow profiles up to 260 °C peak.
How does SMCJ8.5A-M3/9AT compare to SMCJ8.5CA-M3 in terms of polarity and application?
SMCJ8.5A-M3/9AT is unidirectional, with cathode marked and intended for DC-biased lines like power rails or single-ended signals. SMCJ8.5CA-M3 is bidirectional, lacking polarity marking and designed for AC-coupled or floating nodes such as RS-485, CAN, or audio lines. Both share identical VWM (8.5 V), PPPM (1500 W), and VC (14.4 V), but their breakdown symmetry differs: SMCJ8.5CA-M3 clamps equally in both directions, while SMCJ8.5A-M3/9AT conducts only when cathode is positive relative to anode. SMCJ8.5A-M3/9AT is preferred for grounded DC systems where reverse conduction must be avoided.
What is the thermal resistance and mounting requirement for SMCJ8.5A-M3/9AT?
The SMCJ8.5A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W, measured on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To achieve rated power dissipation (6.5 W at TA = 50 °C), PCB layout must follow Vishay's recommended pad dimensions and avoid thermal isolation. The device meets MSL Level 1 and requires no baking before reflow. SMCJ8.5A-M3/9AT performs reliably under continuous thermal cycling when mounted per JEDEC J-STD-020 guidelines.
SMCJ8.5A-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for SMCJ8.5A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCJ8.5A-M3/9AT 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-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ8.5A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5A-M3/9AT?
SMCJ8.5A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5A-M3/9AT 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-M3/9AT?
For technical support, including SMCJ8.5A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ8.5A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ8.5A-M3/9AT?
All SMCJ8.5A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ8.5A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5A-M3/9AT Tags
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