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Vishay General Semiconductor - Diodes Division SMCJ85C-E3/9AT
- Part No.:
- SMCJ85C-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85C-E3/9AT.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,130
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Product details
Overview
SMCJ85C-E3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 85 V stand-off voltage (VWM), 137 V maximum clamping voltage (VC) at 10.9 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ85C-E3/9AT datasheet, SMCJ85C-E3/9AT pinout, SMCJ85C-E3/9AT application, or SMCJ85C-E3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-214AB mechanical data, clamping performance under surge conditions, and direct alternatives for circuit-level ESD and lightning transient protection design.
Technical Context
The SMCJ85C-E3/9AT operates as a bi-directional avalanche diode, symmetrically clamping voltage transients in both polarities without polarity marking. Its breakdown voltage (VBR) ranges from 94.4 V to 104 V at 1 mA test current, with <1.0 µA reverse leakage at 85 V stand-off - enabling reliable hold-off in 24–48 V DC systems subject to load dump or inductive switching.
Thermally, it exhibits 15 °C/W junction-to-lead thermal resistance (RθJL) and 75 °C/W junction-to-ambient (RθJA) on recommended 8.0 mm × 8.0 mm copper pads. It sustains 150 °C max junction temperature and meets J-STD-020 MSL Level 1 with 260 °C reflow peak - suitable for high-reliability surface-mount assembly in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range in 72–90 V nominal systems. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients above system rail. |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage level limits downstream IC stress during 10/1000 µs surges per IEC 61000-4-5. |
| PPPM | 1500 W - Peak surge energy handling capacity for single-event transients like ISO 7637-2 Pulse 5a (load dump). |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves efficiency in always-on monitoring circuits and low-power sensor interfaces. |
| TJ max | +150 °C - Enables operation in under-hood automotive locations and enclosed industrial enclosures without derating. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional configuration with no polarity marking - terminals are symmetrical anode/cathode pair. Molding compound meets UL 94 V-0; matte tin-plated leads comply with J-STD-002 solderability and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity; no band marking required. |
| Case (cathode side) | Thermal path & mechanical anchor | DO-214AB body provides primary heat conduction to PCB copper; requires 8.0 mm × 8.0 mm pad per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and body electronics requiring long-term field reliability. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) up to 137 V clamping - protects 24 V systems against battery disconnection surges. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), critical for protecting high-speed interface ICs. |
| MSL Level 1, 260 °C peak | Supports standard lead-free reflow profiles without moisture-related popcorning or delamination risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against ISO 7637-2 load dump transients. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and microcontroller power domains. Use Value: Limits transient voltage to ≤137 V, preventing damage to 36 V-rated input stages while maintaining >85 V normal operation margin. |
Use Scenario: Shielding analog output lines (4–20 mA) and digital sensor buses (I²C, SPI) in factory automation modules. IC Role / Device Role / Timing Role: Parallel-connected TVS across signal and ground to shunt ESD (IEC 61000-4-2) and burst noise (IEC 61000-4-4). Use Value: Sub-µA leakage avoids loading precision current loops; 137 V clamping prevents latch-up in 3.3 V/5 V sensor interface ICs. |
| Telecom Line Card Surge Suppression | Renewable Energy Inverter DC Link Protection |
Use Scenario: Safeguarding Ethernet PHY power and data lines in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bi-directional TVS on PoE power pairs and differential data lanes (e.g., MDI-X) to clamp common-mode transients. Use Value: Symmetric clamping ensures equal protection regardless of surge polarity; 1500 W rating handles multi-kV induced surges per IEC 61000-4-5. |
Use Scenario: Protecting DC link capacitors and gate drivers in solar string inverters subjected to grid-switching transients. IC Role / Device Role / Timing Role: Clamp device across 800 V DC bus to limit overvoltage spikes during IGBT turn-off or fault clearing. Use Value: Withstands repeated 10/1000 µs surges up to 137 V clamping - extends capacitor lifetime and prevents gate oxide failure in SiC MOSFET drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher VC (137 V same, but lower IPPM = 2.9 A). | Suitable for space-constrained consumer or telecom boards where surge energy is limited to IEC 61000-4-2 only. | Select when board area is critical and peak surge energy does not exceed 400 W - not for automotive load dump. |
| SMCJ85CAHE3/9AT | Identical electrical specs and DO-214AB package; differs only in AEC-Q101 qualification suffix (HE3 vs E3). | Required for new automotive designs mandating full AEC-Q101 documentation traceability and extended reliability testing. | Choose SMCJ85CAHE3/9AT if OEM requires certified AEC-Q101 compliance; SMCJ85C-E3/9AT remains valid for industrial use. |
Compared with SMCJ85C-E3/9AT, SMAJ85CA-E3/61T offers footprint reduction at the cost of 73% lower surge energy handling, while SMCJ85CAHE3/9AT delivers identical protection with formal AEC-Q101 certification - making the latter essential for Tier 1 automotive sourcing and the former viable for cost-sensitive industrial designs.
Availability
SMCJ85C-E3/9AT is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply and RoHS-compliant packaging.
Supply support for SMCJ85C-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, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified components.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 validation and UL recognition.
FAQ
What is the clamping voltage of the SMCJ85C-E3/9AT under a 10/1000 µs surge?
The SMCJ85C-E3/9AT clamps to a maximum of 137 V when subjected to its rated peak pulse current of 10.9 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet (Document Number: 88394, page 2). The clamping voltage directly determines the maximum stress imposed on downstream components during surge events.
Is the SMCJ85C-E3/9AT suitable for automotive applications?
Yes, the SMCJ85C-E3/9AT is AEC-Q101 qualified and explicitly listed in Vishay's automotive-grade product documentation. It meets requirements for temperature cycling, high-temperature reverse bias, and ESD robustness - making it appropriate for under-hood and chassis-mounted modules. However, note that the HE3 suffix variant (SMCJ85CAHE3/9AT) carries full AEC-Q101 certification documentation required by some Tier 1 OEMs.
Does the SMCJ85C-E3/9AT have polarity markings?
No, the SMCJ85C-E3/9AT is a bi-directional TVS diode and carries no polarity marking on the DO-214AB package. Its symmetrical construction allows installation in either orientation across protected lines - a key advantage for protecting AC-coupled or floating signals such as CAN, RS-485, or Ethernet data pairs without concern for anode/cathode alignment.
What is the maximum reverse leakage current of the SMCJ85C-E3/9AT at its stand-off voltage?
The SMCJ85C-E3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 85 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on circuits and avoids signal integrity degradation in high-impedance sensor interfaces - critical for battery-powered or precision analog applications.
What package type does the SMCJ85C-E3/9AT use, and what are its mounting requirements?
The SMCJ85C-E3/9AT uses the DO-214AB (SMCJ) surface-mount package. Per Vishay's datasheet, optimal thermal performance requires mounting each terminal on a minimum 8.0 mm × 8.0 mm copper pad to achieve specified RθJA (75 °C/W) and sustain 1500 W surge capability. The device is compatible with standard lead-free reflow profiles (MSL Level 1, 260 °C peak).
SMCJ85C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 151V
- Current - Peak Pulse (10/1000µs):
- 9.9A
- 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)
SMCJ85C-E3/9AT FAQ
1.How can I place an order for SMCJ85C-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85C-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 SMCJ85C-E3/9AT reliable?
The price and inventory of SMCJ85C-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 SMCJ85C-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85C-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85C-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85C-E3/9AT?
SMCJ85C-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85C-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 SMCJ85C-E3/9AT?
For technical support, including SMCJ85C-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85C-E3/9AT requirements.
6.How does Aetrix verify that SMCJ85C-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85C-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 SMCJ85C-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85C-E3/9AT?
All SMCJ85C-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85C-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 SMCJ85C-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85C-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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