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Vishay General Semiconductor - Diodes Division SMCJ85AHE3_A/H
- Part No.:
- SMCJ85AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHE3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,722
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Product details
Overview
SMCJ85AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR), and 1500 W peak pulse power (10/1000 μs). It clamps transients to ≤137 V at 10.9 A peak current and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the SMCJ85AHE3_A/H datasheet, SMCJ85AHE3_A/H pinout, SMCJ85AHE3_A/H application, or SMCJ85AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, glass-passivated junction, and compatibility with automated SMT placement on automotive and industrial PCBs requiring robust ESD and lightning surge immunity.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp voltage surges above its VWM threshold, with fast response time (<1 ns) and low clamping ratio (VC/VBR ≈ 1.37). Its unidirectional polarity features a cathode band marking and supports DC-biased signal/power line protection.
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling reliable operation under repetitive surge conditions when properly mounted. The device meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Ensures consistent avalanche initiation across production lot |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage during 1500 W 10/1000 μs surge, limiting downstream stress |
| PPPM | 1500 W - Peak surge power handling capability per single transient event |
| IFSM | 200 A - 8.3 ms half-sine surge current rating for unidirectional forward conduction |
| TJ range | –55 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMCJ85AHE3_A/H is housed in the SMC (DO-214AB) package: a molded, RoHS-compliant, halogen-free surface-mount case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance reference in unidirectional protection configurations |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 85 V rail or signal); clamps to anode when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance |
| Glass passivated junction | Enhances long-term stability and reduces leakage drift under thermal/humidity stress |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; compatible with high-volume SMT assembly lines |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V/48 V battery-supplied ECUs against load dump (ISO 16750-2) and alternator transients. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤137 V during 1500 W surges, preventing latch-up or permanent damage to downstream ASICs and gate drivers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules exposed to field wiring noise. IC Role / Device Role / Timing Role: Unidirectional shunt protector on signal lines referenced to system ground, absorbing coupled EFT and surge energy. Use Value: Maintains signal integrity below 137 V clamping level while adding <1 pF capacitance-no bandwidth degradation for DC–10 kHz sensor signals. |
| Telecom DC Power Feeds | Motor Drive Control Signal Lines |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary DC input bus, coordinated with upstream fuses and secondary filtering. Use Value: Withstands repeated 10/1000 μs surges up to 1500 W without parameter shift, ensuring multi-year field reliability. | Use Scenario: Shielding isolated gate drive signals (e.g., PWM to IGBT/MOSFET gates) from cross-talk and switching noise in variable-frequency drives. IC Role / Device Role / Timing Role: Localized clamping element adjacent to optocoupler or digital isolator outputs. Use Value: Fast sub-nanosecond response prevents false triggering or shoot-through caused by nanosecond-scale transients on gate control paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85AHE3_A/H | Lower PPPM (600 W), same VWM/VBR, SMB (DO-214AA) package (smaller footprint) | Reduced surge margin; suitable only where peak threat energy is ≤600 W | Select when board space is constrained and surge profile is less severe (e.g., consumer-grade I/O, not automotive load dump) |
| SMCJ85CAHE3_A/H | Bidirectional variant; identical VWM/VBR/PPPM, but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) without DC bias | Choose when protecting differential or unbiased interfaces where polarity reversal may occur |
Compared with SMCJ85AHE3_A/H, SMBJ85AHE3_A/H trades surge capacity for compactness, while SMCJ85CAHE3_A/H adds bidirectional symmetry at no power penalty-selection depends strictly on threat profile, bias condition, and layout constraints.
Availability
SMCJ85AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, telecom power systems, and sensor interface designs requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ85AHE3_A/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, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where failure tolerance and long-term parametric stability are critical.
FAQ
What is the clamping voltage of SMCJ85AHE3_A/H at its rated peak pulse current?
The SMCJ85AHE3_A/H clamps to a maximum of 137 V at its specified peak pulse current of 10.9 A (10/1000 μs waveform). This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, and it defines the upper voltage limit imposed on protected circuits during worst-case surge events. The SMCJ85AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ85AHE3_A/H qualified for automotive applications?
Yes, SMCJ85AHE3_A/H is AEC-Q101 qualified, as indicated by the "HE3" suffix in its ordering code. This qualification confirms that the SMCJ85AHE3_A/H has passed rigorous stress tests-including high-temperature reverse bias, temperature cycling, and surge endurance-required for use in automotive electronic control units, body electronics, and powertrain subsystems. Its construction and testing align with automotive reliability standards.
What does the "A/H" suffix mean in SMCJ85AHE3_A/H?
The "A/H" suffix in SMCJ85AHE3_A/H denotes packaging configuration: "A" indicates tape-and-reel delivery, and "H" specifies the preferred package code for 7-inch diameter reels containing 850 units. This format ensures compatibility with high-speed pick-and-place equipment and supports automated manufacturing workflows. The SMCJ85AHE3_A/H is supplied in moisture-barrier packaging compliant with J-STD-020 MSL Level 1.
How does SMCJ85AHE3_A/H differ from SMCJ85CAHE3_A/H?
The SMCJ85AHE3_A/H is unidirectional, with a cathode band marking and asymmetric conduction (forward-biased conduction only), whereas SMCJ85CAHE3_A/H is bidirectional-lacking polarity marking and providing symmetrical clamping for AC or floating signals. Both share identical VWM (85 V), VBR, PPPM (1500 W), and package, but their circuit roles differ fundamentally: SMCJ85AHE3_A/H protects DC-biased lines, while SMCJ85CAHE3_A/H suits differential buses like CAN or RS-485.
What is the thermal resistance of SMCJ85AHE3_A/H from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ85AHE3_A/H is 75 °C/W, measured under standard conditions using the minimum recommended pad layout (0.31″ × 0.31″ copper pads per terminal). This value assumes still air and defines the temperature rise per watt of steady-state power dissipation. For higher power handling, thermal design must account for PCB copper area, layer count, and airflow-since the SMCJ85AHE3_A/H is rated for 6.5 W at TA = 50 °C.
SMCJ85AHE3_A/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ85AHE3_A/H FAQ
1.How can I place an order for SMCJ85AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHE3_A/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 SMCJ85AHE3_A/H reliable?
The price and inventory of SMCJ85AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ85AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHE3_A/H?
SMCJ85AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHE3_A/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 SMCJ85AHE3_A/H?
For technical support, including SMCJ85AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ85AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHE3_A/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 SMCJ85AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ85AHE3_A/H?
All SMCJ85AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHE3_A/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 SMCJ85AHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ85AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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