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Vishay General Semiconductor - Diodes Division SMCJ85CA-E3/57T
- Part No.:
- SMCJ85CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CA-E3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,291
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Product details
Overview
SMCJ85CA-E3/57T from Vishay General Semiconductor is a bidirectional 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 sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ85CA-E3/57T datasheet, SMCJ85CA-E3/57T pinout, SMCJ85CA-E3/57T application, or SMCJ85CA-E3/57T equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility, and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ85CA-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both directions due to its bidirectional construction. Its breakdown voltage (VBR) is specified at 94.4–104 V (min/max) at 1 mA test current, ensuring reliable turn-on before system damage occurs during transients.
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, enabling effective heat dissipation when mounted per recommended 0.31" × 0.31" copper pad layout. It meets MSL Level 1 per J-STD-020 and supports peak forward surge current up to 200 A (8.3 ms half-sine) in unidirectional variants - not applicable here due to bidirectional polarity.
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 at 1 mA - Ensures consistent avalanche initiation across production lots and temperature ranges. |
| VC @ IPPM | 137 V at 10.9 A - Clamping voltage under standardized 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPPM | 1500 W - Peak pulse power handling capability; enables robust protection against lightning-induced surges and inductive switching spikes. |
| ID @ VWM | 1.0 µA - Ultra-low leakage at rated stand-off voltage; minimizes standby power loss and avoids false triggering. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-temperature industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; optimized for automated pick-and-place and reflow soldering. |
Pinout & Package
SMCJ85CA-E3/57T uses the SMC (DO-214AB) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking and functions identically in either orientation. The package features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either direction) | Accepts surge current regardless of polarity; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current exit point (either direction) | Completes low-impedance path to ground or return rail during clamping; requires low-inductance PCB routing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., USB D+/D−, RS-485) without polarity concerns. |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation when properly mounted. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with higher-voltage buses. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, eliminating bake requirements prior to assembly. |
| AEC-Q101 qualification path | Base P/NHE3 suffix variant available for automotive applications; this E3/57T version supports commercial-grade deployment with upgrade path. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and jump-start transients in passenger vehicles. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp ±100 V surges within nanoseconds. Use Value: Prevents latch-up or gate oxide rupture in microcontrollers and power management ICs exposed to ISO 7637-2 Pulse 5a/b events. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors connected to long cables in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting induced EFT bursts (IEC 61000-4-4) and lightning-induced common-mode noise on twisted-pair wiring. Use Value: Maintains signal integrity below 100 pF junction capacitance while limiting transient overshoot to ≤137 V at full rated surge current. |
| Telecom Data Line Surge Suppression | Consumer Equipment AC/DC Input Stage |
Use Scenario: Shielding RS-485 transceivers in building control networks from induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to local ground, leveraging symmetrical bidirectional response. Use Value: Enables compliance with IEC 61000-4-5 Ed. 3 (10/700 µs) immunity testing up to 4 kV without additional series impedance. | Use Scenario: Secondary-side overvoltage suppression on 5 V or 12 V DC outputs of wall adapters and power supplies. IC Role / Device Role / Timing Role: Final-stage clamping device after primary MOV and secondary filter, absorbing residual fast-rising transients escaping upstream stages. Use Value: Reduces risk of catastrophic failure in downstream USB ports, display drivers, or audio amplifiers subjected to conducted surges per EN 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-E3/52T | Lower PPPM (600 W), same VWM/VC, SMB package (smaller footprint, lower thermal mass) | Better suited for space-constrained consumer PCBs; less robust for industrial lightning surges | Select when board area is critical and surge threat level is limited to IEC 61000-4-4 EFT only. |
| SMCJ85A-E3/57T | Unidirectional variant; identical VWM, VC, and PPPM but asymmetric clamping (cathode-marked) | Required where DC bias exists and reverse conduction must be blocked (e.g., single-supply data lines) | Choose only if circuit topology mandates polarity-aware protection and reverse leakage must be minimized. |
Compared with SMBJ85CA-E3/52T and SMCJ85A-E3/57T, the SMCJ85CA-E3/57T uniquely balances high-energy handling (1500 W), bidirectional symmetry, and SMC package thermal performance - making it optimal for automotive and industrial applications demanding both robustness and polarity-agnostic design.
Availability
SMCJ85CA-E3/57T is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, telecom data line surge suppression, and consumer power supply output stage safeguarding requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMCJ85CA-E3/57T 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, efficiency, and application-specific optimization.
The SMCJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and telecom infrastructure - prioritizing clamping precision, surge endurance, and manufacturability.
FAQ
What is the clamping voltage of the SMCJ85CA-E3/57T under maximum rated surge current?
The SMCJ85CA-E3/57T exhibits a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current (IPPM) of 10.9 A under the standard 10/1000 µs waveform. This value is measured at TJ = 25 °C with devices mounted on 0.31" × 0.31" copper pads per Vishay's recommended layout. The SMCJ85CA-E3/57T maintains this clamping performance across its operational temperature range, supporting predictable overvoltage limiting in mission-critical circuits.
Is the SMCJ85CA-E3/57T suitable for automotive applications?
The SMCJ85CA-E3/57T is RoHS-compliant and built on Vishay's AEC-Q101-qualified platform; however, this specific part number carries the E3 commercial-grade suffix, not HE3. For production automotive use, the SMCJ85CA-HE3 variant must be selected to ensure full AEC-Q101 qualification. The SMCJ85CA-E3/57T remains appropriate for automotive prototyping, aftermarket modules, and non-safety-critical subsystems where commercial-grade reliability suffices.
How does the bidirectional nature of the SMCJ85CA-E3/57T affect its PCB layout?
Because the SMCJ85CA-E3/57T is bidirectional, it lacks polarity markings and may be placed in either orientation on the PCB without functional impact. This simplifies layout for differential or AC-coupled signals like RS-485 or CAN, eliminating orientation verification during assembly. However, low-inductance grounding remains essential: both terminals should connect directly to solid ground planes using short, wide traces to preserve nanosecond-level response and prevent voltage overshoot during high-di/dt events. The SMCJ85CA-E3/57T benefits from symmetric trace routing when used across balanced lines.
What is the maximum operating temperature for the SMCJ85CA-E3/57T?
The SMCJ85CA-E3/57T has a maximum junction temperature (TJ max.) of +150 °C and an operating junction/storage temperature range of –55 °C to +150 °C. Its thermal resistance values - RθJA = 75 °C/W and RθJL = 15 °C/W - indicate that sustained power dissipation requires adequate copper pour and proper mounting per the 0.31" × 0.31" pad recommendation. At ambient temperatures up to +85 °C, the SMCJ85CA-E3/57T retains full surge rating capability when thermally managed per Vishay's guidelines.
Does the SMCJ85CA-E3/57T meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, the SMCJ85CA-E3/57T meets MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can withstand peak reflow temperatures up to 260 °C without preconditioning or baking. This is enabled by its robust molding compound and matte tin-plated leads, which comply with J-STD-002 and JESD 22-B102 solderability standards. The SMCJ85CA-E3/57T is fully compatible with standard lead-free reflow profiles used in high-volume SMT manufacturing.
SMCJ85CA-E3/57T 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-E3/57T FAQ
1.How can I place an order for SMCJ85CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CA-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ85CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CA-E3/57T?
SMCJ85CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CA-E3/57T 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-E3/57T?
For technical support, including SMCJ85CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ85CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85CA-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85CA-E3/57T?
All SMCJ85CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CA-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ85CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CA-E3/57T Tags
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