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Vishay General Semiconductor - Diodes Division SMCJ85C-E3/57T
- Part No.:
- SMCJ85C-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85C-E3/57T.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,728
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Product details
Overview
SMCJ85C-E3/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage 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) under 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMCJ85C-E3/57T datasheet, SMCJ85C-E3/57T pinout, SMCJ85C-E3/57T application, or SMCJ85C-E3/57T equivalent, key selection criteria include bi-directional clamping symmetry, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse (or forward, in bi-directional mode) voltage exceeds its breakdown threshold (VBR min = 94.4 V, max = 104 V at 1 mA), it avalanches to limit downstream voltage to ≤137 V. Its low incremental surge resistance and <1 ns response time enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Designed for surface-mount reliability, the SMCJ85C-E3/57T uses glass-passivated junctions, matte tin-plated leads compliant with J-STD-002/JESD 22-B102, and meets UL 94 V-0 flammability. Its thermal resistance (RθJA = 75 °C/W) and 150 °C max junction temperature support operation in harsh environments without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Ensures reliable turn-on margin above VWM with defined tolerance |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage seen by protected circuit during 10/1000 µs surge |
| PPPM | 1500 W - Peak transient energy handling capacity under standard surge waveform |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables use in under-hood automotive and industrial control enclosures |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability per stress test requirements |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional configuration with no polarity marking (unlike uni-directional variants which feature cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bi-directional terminals - either end serves as anode or cathode depending on transient polarity; no functional distinction |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary heat path to PCB copper; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware layout in AC-coupled or differential lines |
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS sensor interfaces |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - supports standard SMT assembly without dry-pack or baking |
| Glass-passivated junction | Enhanced long-term stability and reduced parameter drift under thermal cycling and humidity stress |
| RoHS-compliant matte tin leads | Compatible with lead-free reflow profiles and prevents whisker growth (JESD 201 Class 1A) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/FlexRay transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt surge energy before reaching IC pins. Use Value: Limits transient voltage to ≤137 V while sustaining 1500 W peak power - preventing latch-up or gate oxide damage in 5 V–12 V automotive ICs. | Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced surges (e.g., relay coil flyback, motor drive noise). IC Role / Device Role / Timing Role: Bi-directional transient suppressor across isolated 24 V DC input lines, paired with optocoupler input stage. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5; low leakage (<1 µA) avoids false triggering in high-impedance sensing circuits. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller inputs against lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS mounted on RJ45 jack PCB, clamping differential and common-mode transients before transformer isolation. Use Value: Symmetrical bi-directional response ensures equal protection regardless of surge polarity; 137 V clamping compatible with 100BASE-TX and PoE+ voltage margins. | Use Scenario: Input-stage surge suppression in AC-DC adapters for smart home devices, guarding bridge rectifier and primary-side controller. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to clamp line-to-line and line-to-ground transients per IEC 61000-4-4. Use Value: 1500 W PPPM rating handles repetitive fast transients (EFT) without degradation; DO-214AB footprint enables compact, cost-effective layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85C | Lower PPPM (600 W), same VWM (85 V), smaller DO-214AC (SMA) package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select only where space constraints outweigh surge energy requirements |
| 1.5KE85CA | Same VWM and bi-directionality, but through-hole DO-15 package and higher RθJA (100 °C/W) | Requires manual or wave soldering; less suitable for high-volume SMT production | Prefer for legacy designs or prototyping where board real estate is not constrained |
Compared with SAC85C and 1.5KE85CA, the SMCJ85C-E3/57T delivers 2.5× higher surge power handling in a RoHS-compliant, AEC-Q101-qualified SMT package - making it optimal for automotive and industrial applications demanding both reliability and manufacturability.
Availability
SMCJ85C-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply and full traceability.
Supply support for SMCJ85C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure - balancing clamping precision, surge robustness, and SMT manufacturability.
FAQ
What is the breakdown voltage range of the SMCJ85C-E3/57T?
The SMCJ85C-E3/57T has a guaranteed breakdown voltage (VBR) range of 94.4 V to 104 V at 1 mA test current, measured in both directions due to its bi-directional construction. This ensures consistent clamping behavior regardless of transient polarity, and provides a safe margin above its 85 V stand-off voltage (VWM) to prevent false triggering during normal operation.
Is the SMCJ85C-E3/57T suitable for automotive applications?
Yes, the SMCJ85C-E3/57T is AEC-Q101 qualified and explicitly rated for automotive use. Its 150 °C maximum junction temperature, MSL Level 1 rating, and validation against automotive surge standards (e.g., ISO 7637-2) make it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under thermal and electrical stress is critical. The SMCJ85C-E3/57T meets these requirements without derating.
How does the SMCJ85C-E3/57T differ from uni-directional SMCJ85A variants?
The SMCJ85C-E3/57T is bi-directional with symmetrical electrical characteristics in both polarities and no cathode marking, whereas SMCJ85A is uni-directional with a visible cathode band and conducts only in reverse bias. The SMCJ85C-E3/57T clamps transients on AC-coupled or differential lines without polarity concerns, while SMCJ85A requires correct orientation and is used where DC bias direction is fixed - such as on power rail inputs.
What is the maximum clamping voltage of the SMCJ85C-E3/57T under surge conditions?
The SMCJ85C-E3/57T has a maximum clamping voltage (VC) of 137 V at its rated peak pulse current (IPPM) of 10.9 A, tested with a 10/1000 µs waveform. This value represents the highest voltage imposed on the protected circuit during worst-case surge events, and is critical for ensuring downstream ICs remain within their absolute maximum ratings - especially in 12 V and 24 V automotive and industrial systems.
Does the SMCJ85C-E3/57T require special PCB layout considerations?
Yes - for optimal thermal and electrical performance, the SMCJ85C-E3/57T must be mounted on minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per Vishay specification. This minimizes thermal resistance (RθJA = 75 °C/W) and ensures reliable energy dissipation during 1500 W surges. Avoid narrow traces or thermal reliefs between pads and internal ground/power planes.
SMCJ85C-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:
- 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-E3/57T FAQ
1.How can I place an order for SMCJ85C-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85C-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 SMCJ85C-E3/57T reliable?
The price and inventory of SMCJ85C-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 SMCJ85C-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85C-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85C-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85C-E3/57T?
SMCJ85C-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85C-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 SMCJ85C-E3/57T?
For technical support, including SMCJ85C-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85C-E3/57T requirements.
6.How does Aetrix verify that SMCJ85C-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85C-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 SMCJ85C-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85C-E3/57T?
All SMCJ85C-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85C-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 SMCJ85C-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ85C-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85C-E3/57T Tags
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