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Vishay General Semiconductor - Diodes Division SMCJ85AHE3/9AT
- Part No.:
- SMCJ85AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHE3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,799
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Product details
Overview
SMCJ85AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 137 V maximum clamping voltage (VC) at 10.9 A IPPM, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCJ85AHE3/9AT datasheet, SMCJ85AHE3/9AT pinout, SMCJ85AHE3/9AT application, or SMCJ85AHE3/9AT equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ85AHE3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling precise clamping during fast transients such as ESD or inductive switching spikes.
Designed for surface-mount implementation, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C), supports 200 A IFSM (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range. Polarity is indicated by a cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - Confirmed breakdown range defining turn-on threshold |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage during full 1500 W surge, limiting stress on downstream ICs |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity per industry-standard waveform |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, guiding heatsinking requirements on standard PCB pads |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with UL 94 V-0 flammability rating. Cathode identified by a single band on the body; anode is unmarked end. Matte tin-plated leads comply with J-STD-002 solderability and JESD 22-B102 whisker testing (Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connects to protected line; conducts during overvoltage to shunt current to ground |
| Anode (unmarked end) | Reference/ground terminal | Typically tied to system ground or low-impedance return path for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS sensor interfaces |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| Low incremental surge resistance | Minimizes VC rise under high di/dt, improving protection margin for sensitive MOSFETs and microcontrollers |
| MSL Level 1 rating | Enables single-pass reflow without moisture-related popcorning or delamination |
| RoHS-compliant HE3 suffix | Meets global environmental regulations while maintaining full electrical and thermal performance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 85 V. Use Value: Limits peak voltage to ≤137 V during 1500 W transients, preventing damage to LDOs and CAN transceivers. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: TVS mounted across sensor output line and ground to absorb ESD and cable discharge events. Use Value: Clamps 8 kV contact ESD pulses within nanoseconds, preserving ADC accuracy and avoiding latch-up in signal conditioning ICs. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Shielding buck converter inputs from voltage spikes induced by relay switching in power distribution units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN rail upstream of controller IC and input capacitor. Use Value: Withstands 200 A IFSM surge and maintains <1 µA leakage at 85 V, minimizing standby power loss. | Use Scenario: Front-end protection for Ethernet PHY power supplies in network switches exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 48 V bias rail to suppress common-mode transients coupled via transformer windings. Use Value: Delivers 1500 W pulse power handling with 0.073 %/°C VBR tempco, ensuring stable clamping across operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for lower-energy surges; limited to consumer-grade non-automotive use | Select when board space is constrained and surge threat level is below ISO 7637-2 Pulse 5a |
| SMCJ85CAHE3/9AT | Bidirectional variant; same VWM/VBR/PPPM but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose only if protecting bidirectional data lines (e.g., RS-485) or ungrounded sensors |
Compared with SMCJ85AHE3/9AT, SMAJ85A-E3/61T trades surge capacity and thermal robustness for compactness, while SMCJ85CAHE3/9AT adds bidirectional symmetry at no clamping performance cost-neither is pin-compatible due to differing polarity marking and internal structure.
Availability
SMCJ85AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for SMCJ85AHE3/9AT 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed to deliver high-power transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, low clamping voltage, and rugged SMC packaging for demanding under-hood and factory-floor deployments.
FAQ
What is the maximum clamping voltage of the SMCJ85AHE3/9AT under a 10/1000 µs surge?
The SMCJ85AHE3/9AT has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 10.9 A, defined by the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during standardized surge events. The SMCJ85AHE3/9AT achieves this clamping performance while maintaining low incremental resistance, critical for protecting downstream MOSFETs and microcontrollers.
Is the SMCJ85AHE3/9AT qualified for automotive applications?
Yes, the SMCJ85AHE3/9AT carries the HE3 suffix, indicating it is RoHS-compliant and AEC-Q101 qualified. This certification covers stress tests including high-temperature reverse bias, temperature cycling, and highly accelerated life testing-validating its suitability for automotive powertrain, body control, and ADAS systems. The SMCJ85AHE3/9AT meets these requirements without derating at junction temperatures up to +150 °C.
How does the SMCJ85AHE3/9AT differ from the bidirectional SMCJ85CAHE3/9AT?
The SMCJ85AHE3/9AT is unidirectional, with a cathode band marking and conduction only in reverse bias, whereas the SMCJ85CAHE3/9AT is bidirectional and lacks polarity marking. Both share identical VWM (85 V), VBR (94.4–104 V), PPPM (1500 W), and package (SMC), but the SMCJ85AHE3/9AT cannot suppress positive-going transients on grounded lines. Use the SMCJ85AHE3/9AT for DC power rail protection where polarity is fixed.
What is the thermal resistance and recommended pad layout for the SMCJ85AHE3/9AT?
The SMCJ85AHE3/9AT 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. This layout is specified in the Vishay datasheet (Document Number 88394) and must be followed to achieve rated power dissipation and avoid thermal runaway. Smaller pads increase RθJA and reduce safe surge repetition rate. The SMCJ85AHE3/9AT also exhibits RθJL = 15 °C/W to lead, supporting thermal transfer through solder joints.
Does the SMCJ85AHE3/9AT meet lead-free assembly standards?
Yes, the SMCJ85AHE3/9AT uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 Class 2 whisker testing, and is rated for peak reflow temperatures up to 260 °C per J-STD-020 MSL Level 1. Its RoHS-compliant HE3 construction contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. The SMCJ85AHE3/9AT is fully compatible with standard lead-free reflow profiles and requires no special pre-conditioning.
SMCJ85AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMCJ85AHE3/9AT FAQ
1.How can I place an order for SMCJ85AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHE3/9AT 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 SMCJ85AHE3/9AT reliable?
The price and inventory of SMCJ85AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHE3/9AT?
SMCJ85AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHE3/9AT 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 SMCJ85AHE3/9AT?
For technical support, including SMCJ85AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ85AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHE3/9AT 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 SMCJ85AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85AHE3/9AT?
All SMCJ85AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHE3/9AT, 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 SMCJ85AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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