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Vishay General Semiconductor - Diodes Division SMCJ85A-M3/9AT
- Part No.:
- SMCJ85A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85A-M3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,002
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Product details
Overview
SMCJ85A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 137 V clamping voltage at 10.9 A peak surge current, and operates from –55 °C to +150 °C - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ85A-M3/9AT datasheet, SMCJ85A-M3/9AT pinout, SMCJ85A-M3/9AT application, or SMCJ85A-M3/9AT equivalent, this page delivers verified electrical parameters, thermal behavior under surge conditions, halogen-free RoHS-compliant construction (M3 suffix), and real-world use context for ESD and load-switching transient suppression in 12–48 V systems.
Technical Context
The SMCJ85A-M3/9AT uses a glass-passivated silicon junction to achieve fast response (<1 ns) and low incremental surge resistance, enabling effective clamping of inductive switching transients and lightning-induced surges. Its unidirectional polarity (cathode-banded) supports DC-biased protection paths with minimal leakage (≤1.0 µA at 85 V).
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, allowing reliable operation up to 150 °C junction temperature when mounted on 8.0 mm × 8.0 mm copper pads per terminal. It meets MSL level 1 (260 °C reflow) and is halogen-free per JESD201 Class 2 whisker test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - maximum continuous reverse operating voltage before significant conduction begins; defines upper limit for normal DC rail operation. |
| VBR (Breakdown Voltage) | 94.4–104 V at 1 mA - voltage range where device transitions into avalanche conduction; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 137 V at IPPM = 10.9 A - peak voltage seen across protected circuit during 10/1000 µs surge; critical for downstream IC survivability. |
| PPPM (Peak Pulse Power) | 1500 W - maximum non-repetitive surge energy absorption capability under standardized 10/1000 µs waveform. |
| ID (Reverse Leakage) | ≤1.0 µA at 85 V - ultra-low leakage preserves efficiency and avoids false triggering in high-impedance sensing circuits. |
| TJ max. | +150 °C - enables deployment in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMC (DO-214AB) - surface-mount package with 8.0 mm × 8.0 mm thermal pad footprint; optimized for automated placement and high-power dissipation. |
Pinout & Package
SMCJ85A-M3/9AT is housed in an SMC (DO-214AB) package with two terminals: anode and cathode. The black band denotes the cathode end. Leads are matte tin-plated and solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage, clamping upstream node. |
| Anode | Reference / return path | Typically tied to system ground or low-impedance return; completes conduction path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge robustness. |
| 1500 W peak pulse power rating | Withstands high-energy transients from inductive load switching (e.g., solenoids, motors) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 100 V-rated MOSFETs and microcontrollers. |
| Fast response time (<1 ns) | Engages before sensitive components experience damaging voltage overshoot during ESD or fast-rising transients. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly processes. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs against load-dump spikes (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 85 V while remaining inert during nominal operation. Use Value: Limits peak voltage to 137 V during 10.9 A surge, preventing damage to 36 V-rated DC-DC converters and CAN transceivers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory-floor pressure sensors from ESD and cable-coupled noise. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS shunting transients to ground without perturbing precision current sourcing. Use Value: Maintains signal integrity by clamping fast transients before they propagate into op-amp input stages or ADC front-ends. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges entering via long feeder cables. IC Role / Device Role / Timing Role: Unidirectional TVS installed at board edge, oriented to conduct negative surges toward common ground plane. Use Value: Absorbs 1500 W pulses without failure, preserving uptime in carrier-grade power distribution units. |
Use Scenario: Protecting high-side gate drivers in 48 V BLDC inverters from shoot-through-inducing voltage spikes during MOSFET switching. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across driver supply pins (VDD-to-GND) to suppress ringing and cross-talk. Use Value: Prevents false turn-on of power switches by limiting supply rail excursions to ≤137 V during dV/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85A-M3/9AT (Vishay) | Bidirectional variant with same VWM (85 V), but symmetric clamping in both polarities; slightly higher VC (140 V). | Required where AC-coupled or floating signal lines need protection against bipolar transients (e.g., RS-485 buses). | Select only if bidirectional surge immunity is mandatory; not drop-in for unidirectional DC rails due to different polarity behavior. |
| SMCJ85CA-M3/9AT (Vishay) | Identical packaging and ratings, but CA suffix confirms bidirectional configuration; VBR min/max matches SMCJ85A, but clamps equally in forward/reverse. | Suitable for differential data lines or transformer-isolated supplies where polarity reversal may occur. | Not functionally interchangeable with SMCJ85A-M3/9AT in unidirectional DC applications - verify circuit topology before substitution. |
Compared with SAC85A-M3/9AT and SMCJ85CA-M3/9AT, the SMCJ85A-M3/9AT provides lower-cost, polarity-specific protection ideal for grounded DC rails - avoiding unnecessary bidirectional complexity while delivering identical surge handling and thermal performance in its intended orientation.
Availability
SMCJ85A-M3/9AT is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor interfaces, telecom DC feeds, and motor drive gate driver protection requiring stable component supply and halogen-free compliance.
Supply support for SMCJ85A-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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on reliability, power handling, and automotive qualification.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for ISO 7637-2 compliance, AEC-Q101 readiness, and robust thermal performance in SMC packaging.
FAQ
What is the clamping voltage of the SMCJ85A-M3/9AT at its rated peak pulse current?
The SMCJ85A-M3/9AT has a maximum clamping voltage (VC) of 137 V at its peak pulse current (IPPM) of 10.9 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the highest voltage the protected circuit will experience during a full-rated surge event. The SMCJ85A-M3/9AT maintains this clamping performance across its specified operating temperature range.
Is the SMCJ85A-M3/9AT suitable for automotive applications?
Yes - the SMCJ85A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), meets MSL Level 1, and is AEC-Q101 qualified when ordered with HE3 or HM3 suffixes. While the base SMCJ85A-M3/9AT is commercial-grade, its electrical and thermal specs (TJ max. = +150 °C, 1500 W PPPM) align with under-hood and powertrain ECU protection requirements. For certified automotive use, specify SMCJ85A-HM3/9AT.
How does the SMCJ85A-M3/9AT differ from the SMCJ85CA-M3/9AT?
The SMCJ85A-M3/9AT is unidirectional (cathode-banded), conducting only in reverse bias to protect DC rails, whereas the SMCJ85CA-M3/9AT is bidirectional with symmetrical clamping in both polarities - suited for AC or floating lines. Their VWM (85 V), VBR (94.4–104 V), and PPPM (1500 W) match, but polarity and marking differ. The SMCJ85A-M3/9AT cannot replace SMCJ85CA-M3/9AT in bidirectional circuits without redesign.
What is the thermal resistance of the SMCJ85A-M3/9AT, and how does it affect layout?
The SMCJ85A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To sustain repeated surges, PCB layout must provide adequate copper area and thermal vias to minimize junction temperature rise - exceeding 150 °C risks parametric shift or failure. The SMCJ85A-M3/9AT relies on this pad geometry for rated power dissipation.
Does the SMCJ85A-M3/9AT have a specified junction capacitance?
No - junction capacitance (CJ) is not specified for the SMCJ85A-M3/9AT in the official Vishay datasheet (Document Number: 88394). Capacitance data is provided only for lower-voltage variants (e.g., SMCJ5.0A–SMCJ48A) in Figure 4. For high-frequency signal line protection above ~1 MHz, designers should verify CJ experimentally or select a TVS with published capacitance, as the SMCJ85A-M3/9AT is optimized for power rail rather than RF-sensitive applications.
SMCJ85A-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
SMCJ85A-M3/9AT FAQ
1.How can I place an order for SMCJ85A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85A-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 SMCJ85A-M3/9AT reliable?
The price and inventory of SMCJ85A-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 SMCJ85A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85A-M3/9AT?
SMCJ85A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85A-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 SMCJ85A-M3/9AT?
For technical support, including SMCJ85A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ85A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85A-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 SMCJ85A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85A-M3/9AT?
All SMCJ85A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85A-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 SMCJ85A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85A-M3/9AT Tags
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