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Vishay General Semiconductor - Diodes Division SMCJ85CA-E3/9AT
- Part No.:
- SMCJ85CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CA-E3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
SMCJ85CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal 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.
For engineers reviewing the SMCJ85CA-E3/9AT datasheet, SMCJ85CA-E3/9AT pinout, SMCJ85CA-E3/9AT application, or SMCJ85CA-E3/9AT equivalent, key selection criteria include bidirectional surge protection capability, low clamping ratio (VC/VWM ≈ 1.61), AEC-Q101 qualification eligibility (via HE3/HM3 variants), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ85CA-E3/9AT uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients. Its bidirectional architecture provides symmetrical clamping in both polarities without polarity marking.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from -55 °C to +150 °C junction temperature. The device meets MSL level 1 per J-STD-020 with peak reflow temperature up to 260 °C and complies with UL 497B (QVGQ2 recognition) for protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 94.4 V / 104 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on above VWM with margin. |
| VC @ IPPM | 137 V - Clamped voltage at 10.9 A peak pulse current (10/1000 μs); determines worst-case overvoltage seen by downstream components. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables robust protection against high-energy transients like IEC 61000-4-5 Level 4. |
| ID @ VWM | 1.0 μA - Maximum reverse leakage at 85 V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports use in under-hood automotive and industrial environments with elevated ambient temps. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm height; compatible with IPC-7351B footprint. |
Pinout & Package
SMCJ85CA-E3/9AT is a two-terminal bidirectional TVS diode in SMC (DO-214AB) package. No polarity marking is present; terminals are functionally symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional transient conduction path | Both terminals serve as symmetrical clamping nodes; no cathode band or polarity identification required for CA-series devices. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress without degradation. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD), improving clamping precision and system immunity. |
| MSL Level 1 rating | Enables direct placement into standard SMT reflow profiles without dry-pack or baking requirements. |
| UL 497B recognition (QVGQ2) | Validates suitability for telecom and industrial surge protection systems requiring certified safety compliance. |
| Matte tin plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102, with whisker resistance per JESD 201 Class 2. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) and body electronics against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input supply pins to limit transient overvoltage to ≤137 V during 10/1000 μs surges. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers by maintaining rail integrity below 150 V absolute maximum ratings. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC inputs against field-wiring induced surges. IC Role / Device Role / Timing Role: Low-capacitance (typ. <50 pF) shunt suppressor installed at connector entry point to divert transients before reaching ADC front-end. Use Value: Maintains signal fidelity with sub-μA leakage at 85 V, avoiding DC offset errors while surviving repeated 1 kV/500 A surge events. |
| Telecom Data Line Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: Shielding Ethernet PHY interfaces and RS-485 transceivers from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Paired bidirectional TVS configuration (line-to-line and line-to-ground) leveraging symmetrical VBR and VC characteristics. Use Value: Achieves UL 497B-certified protection with 1500 W single-pulse rating, meeting IEC 61000-4-5 Ed. 3 requirements for telecom infrastructure. |
Use Scenario: Guarding AC-DC adapter primary-side rectifier outputs against mains-borne transients per IEC 61000-4-4 and -4-5. IC Role / Device Role / Timing Role: Standoff-rated clamping device placed after bridge rectifier to absorb energy from 10/1000 μs surges without thermal runaway. Use Value: Delivers 6.5 W steady-state power dissipation capability and 150 °C max junction temperature tolerance for compact, sealed adapter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85CA-13-F (Diodes Inc.) | Same 85 V VWM and 137 V VC, but rated for 1000 W PPPM (vs. 1500 W); slightly higher ID (5 μA vs. 1.0 μA). | Limited to lower-energy surge environments (IEC 61000-4-5 Level 3); less margin for automotive load dump. | Select when cost sensitivity outweighs peak power headroom and UL 497B certification is not required. |
| 1.5KE85CA (ON Semi) | Through-hole DO-201 package; identical electrical specs but larger footprint and manual assembly requirement. | Not suitable for high-density SMT layouts; incompatible with automated pick-and-place and reflow processes. | Choose only for legacy through-hole designs or prototyping where board space and assembly method permit. |
Compared with SAC85CA-13-F and 1.5KE85CA, the SMCJ85CA-E3/9AT offers superior surge power handling in a compact, AEC-Q101-eligible SMT package with UL recognition-making it optimal for production-grade automotive, industrial, and telecom systems demanding high-reliability surface-mount protection.
Availability
SMCJ85CA-E3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom data line interfaces, and consumer power adapter designs requiring stable component supply and full traceability.
Supply support for SMCJ85CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom-where consistent clamping performance, AEC-Q101 qualification, and UL safety recognition are mandatory.
FAQ
What is the clamping voltage of SMCJ85CA-E3/9AT at its rated peak pulse current?
The SMCJ85CA-E3/9AT has a maximum clamping voltage (VC) of 137 V when subjected to its rated 10.9 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping ratio (VC/VWM = 137/85 ≈ 1.61) reflects strong voltage limiting performance for an 85 V standoff device.
Is SMCJ85CA-E3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
The SMCJ85CA-E3/9AT itself is RoHS-compliant commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3 and HM3 ordering codes (e.g., SMCJ85CAHE3_A/I). These variants undergo additional stress testing per AEC-Q101 and are marked accordingly. For production automotive use, specify the HE3 or HM3 variant-not the E3/9AT-to ensure qualification compliance.
What is the thermal resistance from junction to ambient for SMCJ85CA-E3/9AT?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ85CA-E3/9AT is 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal). This value assumes natural convection cooling and is critical for calculating junction temperature rise under steady-state power dissipation (PD = 6.5 W). For higher-power or elevated ambient conditions, thermal derating per Figure 2 in the datasheet must be applied.
Does SMCJ85CA-E3/9AT have polarity markings on the package?
No, the SMCJ85CA-E3/9AT does not have polarity markings because it is a bidirectional TVS diode. Unlike unidirectional types (e.g., SMCJ85A), which feature a cathode band, the CA-suffix devices are symmetric and function identically regardless of orientation. This simplifies PCB layout and eliminates risk of incorrect placement during automated assembly.
What is the maximum reverse leakage current of SMCJ85CA-E3/9AT at its stand-off voltage?
The maximum reverse leakage current (ID) of SMCJ85CA-E3/9AT is 1.0 μA at its rated stand-off voltage (VWM) of 85 V and TA = 25 °C. This low leakage ensures minimal impact on high-impedance circuits such as sensor bias networks or battery-powered monitoring systems, preserving accuracy and extending operational life without introducing parasitic loading.
SMCJ85CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ85CA-E3/9AT FAQ
1.How can I place an order for SMCJ85CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CA-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 SMCJ85CA-E3/9AT reliable?
The price and inventory of SMCJ85CA-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 SMCJ85CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CA-E3/9AT?
SMCJ85CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CA-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 SMCJ85CA-E3/9AT?
For technical support, including SMCJ85CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ85CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85CA-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 SMCJ85CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85CA-E3/9AT?
All SMCJ85CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CA-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 SMCJ85CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CA-E3/9AT Tags
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