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Vishay General Semiconductor - Diodes Division SMCJ85CHE3/9AT
- Part No.:
- SMCJ85CHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CHE3/9AT.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,879
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Product details
Overview
SMCJ85CHE3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for high-energy surge protection on signal and power lines. 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. It is AEC-Q101 qualified and RoHS compliant, used to protect automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMCJ85CHE3/9AT datasheet, SMCJ85CHE3/9AT pinout, SMCJ85CHE3/9AT application, or SMCJ85CHE3/9AT equivalent, this page provides verified electrical parameters, package dimensions, real-world application contexts, and validated alternative parts for automotive-grade transient suppression design.
Technical Context
The SMCJ85CHE3/9AT operates as a bi-directional avalanche diode, symmetrically clamping voltage surges above ±94.4 V (min) and ±104 V (max) breakdown (VBR) in both polarities. Its low incremental surge resistance enables rapid response to transients while maintaining stable clamping performance under repetitive 10/1000 μs pulses.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads, it delivers 1500 W peak pulse power handling with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting operation from –55 °C to +150 °C junction temperature.
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 - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 137 V - Clamped voltage at 10.9 A peak pulse current, defining worst-case overvoltage seen by protected circuit |
| PPPM | 1500 W - Peak surge energy absorption capability with standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off voltage, minimizing standby power loss |
| TJ max. | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
DO-214AB (SMCJ) package: molded plastic case with J-bend leads, 0.320" (8.13 mm) body length, 0.220"–0.246" (5.59–6.22 mm) width, matte tin-plated terminals solderable per J-STD-020 (MSL Level 1, 260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bi-directional) | Surge conduction path | No polarity marking; symmetrical terminals conduct equally in either direction during overvoltage events |
| Case (body) | Thermal and mechanical interface | Plastic housing provides UL 94 V-0 flammability rating and supports heat transfer to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control units and ADAS sensor interfaces |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge events in industrial systems |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance for long-term reliability |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine control modules from load dump and ESD. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across differential signal pair or supply rail to shunt surge energy to ground. Use Value: Limits transient voltage to ≤137 V during 10.9 A surges, preventing latch-up or damage to 5 V or 12 V tolerant interface ICs. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive switching noise from solenoids and relays. IC Role / Device Role / Timing Role: Standoff device mounted between field-side input and controller-side isolation barrier to absorb 1500 W surges. Use Value: Maintains 85 V working voltage margin while clamping fast transients within microseconds, preserving signal integrity and system uptime. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY front-end and RS-485 transceivers in base station equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge arrestor on line side of isolation transformer or common-mode choke. Use Value: Withstands repeated 10/1000 μs surges up to 1500 W without degradation, meeting IEC 61000-4-5 Level 4 requirements. | Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor inverters from back-EMF spikes during brushless DC motor commutation. IC Role / Device Role / Timing Role: Clamp placed across half-bridge supply rails or between gate driver output and ground. Use Value: Fast response (<1 ns) and low clamping voltage prevent false triggering or overvoltage failure in 3.3 V/5 V control logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHE3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM and VBR range | Suitable for space-constrained consumer electronics but insufficient for automotive load dump | Select when board area is critical and surge energy is ≤600 W |
| SMCJ85CA-E3/9AT | Same DO-214AB package and electrical specs, but commercial-grade (non-AEC-Q101) and E3 suffix (JESD 201 Class 1A) | Lacks automotive qualification; acceptable for industrial or telecom where AEC-Q101 not mandated | Choose for cost-sensitive non-automotive designs requiring identical form-fit-function |
Compared with SMCJ85CHE3/9AT, the SMBJ85CAHE3/52T offers reduced surge capacity in a smaller footprint, while the SMCJ85CA-E3/9AT matches mechanical and electrical performance but omits AEC-Q101 validation-making the original part uniquely suited for automotive safety-critical protection.
Availability
SMCJ85CHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ85CHE3/9AT 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 and automotive-grade qualification.
The SMCJ series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMCJ85CHE3/9AT at its rated peak pulse current?
The SMCJ85CHE3/9AT has a maximum clamping voltage (VC) of 137 V at 10.9 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC standards. The SMCJ85CHE3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCJ85CHE3/9AT suitable for automotive applications?
Yes, SMCJ85CHE3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensors, and infotainment interfaces. Its construction includes glass-passivated junctions, matte tin-plated leads compliant with JESD 201 Class 2 whisker testing, and operation from –55 °C to +150 °C. The HE3 suffix confirms its automotive qualification status, distinguishing it from commercial-grade variants like SMCJ85CA-E3/9AT.
How does the bi-directional configuration of SMCJ85CHE3/9AT affect its circuit placement?
The SMCJ85CHE3/9AT has no polarity marking and conducts identically in both directions, allowing direct placement across AC-coupled lines, differential pairs, or floating supply rails without orientation constraints. Unlike uni-directional TVS diodes, it eliminates risk of incorrect installation and simplifies layout for bidirectional signals such as CAN, RS-485, or audio lines. The SMCJ85CHE3/9AT achieves this via symmetrical avalanche structure, with matched VBR min/max in both polarities.
What is the thermal resistance profile of SMCJ85CHE3/9AT and how does it impact PCB layout?
The SMCJ85CHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted per recommended pad layout (0.31" × 0.31" copper pads per terminal). To maintain safe junction temperatures under repeated surges, PCB design must allocate sufficient copper area and avoid thermal bottlenecks. The SMCJ85CHE3/9AT relies on lead conduction for primary heat dissipation, making proper solder fillet formation and pad connectivity critical.
Does SMCJ85CHE3/9AT meet RoHS and halogen-free requirements?
Yes, SMCJ85CHE3/9AT is RoHS-compliant per Directive 2011/65/EU and halogen-free per JEDEC JS709A. The HE3 suffix denotes compliance with both requirements, including JESD 201 Class 2 whisker resistance. Material declarations confirm absence of lead, mercury, cadmium, hexavalent chromium, PBB, PBDE, and regulated halogens (chlorine/bromine < 900 ppm each, total halogens < 1500 ppm). This makes the SMCJ85CHE3/9AT suitable for environmentally regulated markets including EU automotive and industrial equipment.
SMCJ85CHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ85CHE3/9AT FAQ
1.How can I place an order for SMCJ85CHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CHE3/9AT 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 SMCJ85CHE3/9AT reliable?
The price and inventory of SMCJ85CHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85CHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CHE3/9AT?
SMCJ85CHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CHE3/9AT 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 SMCJ85CHE3/9AT?
For technical support, including SMCJ85CHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CHE3/9AT requirements.
6.How does Aetrix verify that SMCJ85CHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85CHE3/9AT 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 SMCJ85CHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85CHE3/9AT?
All SMCJ85CHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CHE3/9AT, 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 SMCJ85CHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85CHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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