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Vishay General Semiconductor - Diodes Division SMCJ85A-E3/9AT
- Part No.:
- SMCJ85A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85A-E3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,466
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Product details
Overview
SMCJ85A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 85 V stand-off voltage (VWM), and 137 V maximum clamping voltage (VC) at 10.9 A IPPM under 10/1000 μs waveform. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMCJ85A-E3/9AT datasheet, SMCJ85A-E3/9AT pinout, SMCJ85A-E3/9AT application, or SMCJ85A-E3/9AT equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, junction temperature derating above 25 °C, standoff voltage tolerance versus system operating voltage, and AEC-Q101 qualification status for automotive use cases.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (94.4–104 V at 1 mA), it avalanches rapidly (<1 ns response) to divert transient current away from downstream circuitry. Its low incremental surge resistance ensures minimal voltage overshoot during high-current transients.
Thermal design relies on its RθJA of 75 °C/W and RθJL of 15 °C/W; derating curves require power reduction above TA = 25 °C, with maximum junction temperature limited to +150 °C. The matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before significant leakage; must exceed system DC rail by ≥10 % to avoid false triggering. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed breakdown range defines turn-on threshold; ensures reliable clamping onset without premature conduction. |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage during 10/1000 μs surge; determines worst-case overvoltage seen by protected IC or MOSFET. |
| PPPM | 1500 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges (4 kV line-to-earth). |
| ID @ VWM | 1.0 μA - Reverse leakage at rated standoff voltage; negligible loading on 85 V supply rails. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design boundary for PCB copper pad area and ambient operating conditions. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm thermal pads; supports automated placement and reflow. |
Pinout & Package
SMCJ85A-E3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case with two terminals, cathode marked by a band. Leads are matte tin-plated and compliant with J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected node (e.g., power rail); conducts avalanche current to ground during overvoltage events. |
| Anode | Reference return path | Typically tied to system ground or low-impedance return plane; completes shunt path for surge current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against high-energy transients such as load dump (ISO 7637-2 Pulse 5a) without failure. |
| 137 V clamping voltage at 10.9 A | Provides defined overvoltage ceiling for 85 V systems, ensuring protected devices remain within safe operating area. |
| Low incremental surge resistance | Minimizes dynamic voltage rise during fast-rising transients, improving clamping precision and reliability. |
| MSL level 1, 260 °C peak reflow | Supports standard lead-free reflow profiles without moisture-induced damage or delamination. |
| RoHS-compliant, commercial grade | Meets environmental compliance requirements for global electronics manufacturing without halogen restrictions. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V/24 V vehicle battery lines exposed to load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and chassis ground. Use Value: Limits voltage to ≤137 V during 100 A/10 ms load dump pulses, preventing gate oxide rupture in power MOSFETs and MCU I/O damage. | Use Scenario: Analog output lines (e.g., 4–20 mA, 0–10 V) from pressure or temperature sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used on single-ended signal paths referenced to local ground. Use Value: Clamps ESD (IEC 61000-4-2 ±8 kV contact) and inductive switching spikes to <140 V, preserving ADC input integrity and calibration stability. |
| Telecom DC Power Input Protection | Consumer Equipment AC/DC Adapter Output Protection |
Use Scenario: -48 V DC telecom power feeds entering base station equipment subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on input bus prior to DC/DC converter stage. Use Value: Absorbs up to 1500 W surge energy while maintaining clamping below -55 V, safeguarding upstream rectifiers and downstream POL converters. | Use Scenario: 12 V or 19 V regulated outputs of wall adapters powering laptops, monitors, or set-top boxes. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp before connector interface. Use Value: Prevents user-exposed ports from delivering hazardous voltages during internal regulator fault or capacitor failure, meeting UL 62368-1 transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-E3/52T | Lower PPPM (600 W), same VWM (85 V), SMB package (smaller footprint, higher RθJA). | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients like ESD or capacitive coupling. | Select when board space is constrained and surge threat level is ≤Level 2; verify thermal margin with reduced pad area. |
| SMCJ85CA-E3/9AT | Bidirectional variant; identical VWM (85 V), VC (137 V), and PPPM (1500 W), but symmetrical breakdown in both polarities. | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus). | Choose for bidirectional protection needs; note absence of cathode marking and doubled ID limit per spec note (3). |
Compared with SMCJ85A-E3/9AT, SMBJ85A-E3/52T trades surge capacity for compactness, while SMCJ85CA-E3/9AT adds polarity symmetry at no performance cost-enabling reuse in AC or differential interfaces without redesigning layout or BOM logic.
Availability
SMCJ85A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCJ85A-E3/9AT 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, thermal performance, and automotive-grade qualification.
The SMCJ series is engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of the SMCJ85A-E3/9AT under standard test conditions?
The SMCJ85A-E3/9AT has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current (IPPM) of 10.9 A using the 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay document 88394. The SMCJ85A-E3/9AT maintains this clamping performance across its operational temperature range, with derating applied above 25 °C ambient.
Is the SMCJ85A-E3/9AT qualified for automotive applications?
The SMCJ85A-E3/9AT is RoHS-compliant and rated for commercial temperature range (−55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive use, Vishay offers the SMCJ85AHE3_X variant (e.g., SMCJ85AHE3_A/I), which carries the HE3 suffix and explicit AEC-Q101 qualification. The SMCJ85A-E3/9AT remains suitable for non-safety-critical industrial or telecom applications where AEC-Q101 is not mandated.
How does the SMCJ85A-E3/9AT differ from the bidirectional SMCJ85CA-E3/9AT?
The SMCJ85A-E3/9AT is unidirectional with cathode marking, while the SMCJ85CA-E3/9AT is bidirectional with no polarity marking and symmetrical breakdown in both directions. Both share identical VWM (85 V), VC (137 V), and PPPM (1500 W), but the bidirectional version allows use on AC or floating lines. The SMCJ85A-E3/9AT exhibits forward conduction behavior (VF = 3.5 V at 100 A), whereas the SMCJ85CA-E3/9AT does not conduct forward current.
What is the thermal resistance from junction to ambient for the SMCJ85A-E3/9AT?
The SMCJ85A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads). This value assumes natural convection cooling; actual thermal performance improves with larger copper areas or forced airflow. Its junction-to-lead resistance (RθJL) is 15 °C/W, supporting efficient heat transfer to PCB traces or heatsinks in high-reliability designs using the SMCJ85A-E3/9AT.
Can the SMCJ85A-E3/9AT be used in place of a Zener diode for overvoltage protection?
No-the SMCJ85A-E3/9AT is a transient voltage suppressor optimized for high-energy, short-duration surges (e.g., ESD, lightning, load dump), not steady-state regulation. Unlike Zener diodes, it does not regulate voltage continuously and exhibits higher leakage above VWM. For DC voltage clamping or regulation, a dedicated Zener or shunt regulator is required; the SMCJ85A-E3/9AT serves only as a fail-safe surge diverter. Its role is complementary-not substitutive-to Zener-based protection schemes.
SMCJ85A-E3/9AT 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 (SMCJ)
SMCJ85A-E3/9AT FAQ
1.How can I place an order for SMCJ85A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85A-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ85A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85A-E3/9AT?
SMCJ85A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85A-E3/9AT 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-E3/9AT?
For technical support, including SMCJ85A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ85A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85A-E3/9AT?
All SMCJ85A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85A-E3/9AT Tags
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