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Vishay General Semiconductor - Diodes Division SMCJ85CA-M3/9AT
- Part No.:
- SMCJ85CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CA-M3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,615
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Product details
Overview
SMCJ85CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 85 V standoff voltage (VWM), 1500 W peak pulse power (PPPM), and clamping voltage of 137 V at 10.9 A IPPM. It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power systems.
For engineers reviewing the SMCJ85CA-M3/9AT datasheet, SMCJ85CA-M3/9AT pinout, SMCJ85CA-M3/9AT application, or SMCJ85CA-M3/9AT equivalent, key selection criteria include bidirectional clamping behavior, 137 V VC at rated IPPM, halogen-free RoHS-compliant M3 termination, -55 °C to +150 °C operating junction range, and compatibility with automated SMT assembly on standard 8 mm × 8 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering consistent clamping performance regardless of transient polarity-critical for protecting AC-coupled or floating signal paths. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive 10/1000 μs surge events.
Designed for surface-mount reliability, the device meets MSL Level 1 per J-STD-020, supports peak reflow temperatures up to 260 °C, and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 94.4 V / 104 V - verified breakdown voltage range at 1 mA test current, ensuring reliable turn-on margin |
| VC @ IPPM | 137 V - clamped voltage at 10.9 A peak pulse current (10/1000 μs waveform), defining worst-case protected node voltage |
| PPPM | 1500 W - peak pulse power handling capability, enabling robust protection against IEC 61000-4-5 Level 4 surges |
| TJ max | +150 °C - maximum junction temperature rating, supporting operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix), JESD 201 Class 2 whisker resistant |
Pinout & Package
SMCJ85CA-M3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking-consistent with bidirectional construction. Terminals are matte tin-plated leads suitable for reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts surge current during negative half-cycle; symmetrical with cathode for bidirectional clamping |
| Cathode | Transient current entry point (positive polarity) | Accepts surge current during positive half-cycle; identical electrical behavior to anode due to bidirectional design |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded circuits without polarity concerns |
| 1500 W peak pulse power | Supports IEC 61000-4-5 4th-level surge immunity (4 kV line-earth, 2 kV line-line) with margin |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream components during transient events |
| MSL Level 1 rating | Permits unlimited floor life and standard reflow without baking, reducing manufacturing complexity |
| Halogen-free M3 termination | Meets environmental compliance requirements for automotive and industrial OEMs while maintaining solder joint integrity |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V/24 V battery-fed ECUs, lighting modules, and body control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary surge suppression device placed at power input stage, clamping transients before they reach DC-DC converters and microcontrollers. Use Value: Withstands 1500 W pulses and operates up to +150 °C, meeting AEC-Q101 qualification requirements for under-hood deployment. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) and digital interfaces (CAN, LIN) in factory automation sensors exposed to ESD and motor switching noise. IC Role / Device Role / Timing Role: Bidirectional shunt protector across signal and return lines, suppressing ±1 kV contact ESD (IEC 61000-4-2) and fast-rising inductive spikes. Use Value: Symmetrical clamping ensures equal protection for both signal polarities without additional components or layout asymmetry. |
| Telecom Power Feeds | Consumer Appliance Motor Controls |
Use Scenario: Input-stage surge protection for PoE-powered devices and DSL/Cable modem power supplies subjected to lightning-induced surges on AC mains or data lines. IC Role / Device Role / Timing Role: First-line defense parallel to bulk capacitance, limiting transient voltage to ≤137 V during 10/1000 μs surges up to 10.9 A. Use Value: 85 V VWM allows compatibility with 72–90 V nominal telecom power rails while providing >10 V margin to prevent false triggering. | Use Scenario: Protecting gate drivers and MCU I/O pins in washing machine, HVAC, and power tool inverters where BLDC motor commutation generates high dv/dt noise. IC Role / Device Role / Timing Role: Localized TVS across motor driver supply rails and feedback sensing nodes to suppress coupled transients from high-side/low-side switching. Use Value: Fast response time (<1 ns) and low Rsurge ensure clamping occurs before sensitive logic thresholds are exceeded, preventing latch-up or reset events. |
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-M3/57T | Lower PPPM (600 W), same VWM/VC, SMB package (smaller footprint, lower thermal mass) | Less robust for high-energy surges; suited for space-constrained consumer electronics with lower surge exposure | Select when board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2 |
| SMCJ85A-M3/9AT | Unidirectional version; same VWM, VC, and PPPM but asymmetric conduction (cathode-marked) | Requires correct polarity placement; unsuitable for AC or floating nodes without external biasing | Choose only for DC-biased rails where polarity is fixed and reverse leakage must be minimized |
Compared with SMBJ85CA-M3/57T and SMCJ85A-M3/9AT, the SMCJ85CA-M3/9AT uniquely delivers bidirectional 1500 W surge handling in the SMC package-enabling simplified layout, higher energy resilience, and universal polarity coverage without redesign.
Availability
SMCJ85CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom power feed circuits, and consumer appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ85CA-M3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where sustained surge immunity and thermal stability are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ85CA-M3/9AT?
The "CA" suffix in SMCJ85CA-M3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMCJ85A), it has no cathode marking and functions identically across either terminal orientation-ideal for AC-coupled or floating signal paths where polarity is undefined or alternating.
What is the clamping voltage of SMCJ85CA-M3/9AT and how is it measured?
The clamping voltage (VC) of SMCJ85CA-M3/9AT is 137 V, measured at its rated peak pulse current (IPPM) of 10.9 A using a standardized 10/1000 μs double-exponential surge waveform. This value represents the maximum voltage that appears across the device terminals during a full-power transient event, directly defining the upper voltage limit imposed on protected circuitry downstream.
Is SMCJ85CA-M3/9AT suitable for automotive applications?
Yes, SMCJ85CA-M3/9AT is suitable for automotive applications as it meets AEC-Q101 qualification when ordered with HE3 or HM3 suffixes. While the M3/9AT variant is commercial-grade, its -55 °C to +150 °C operating junction range, 1500 W surge capability, and robust SMC package make it widely deployed in non-safety-critical automotive subsystems such as body electronics, lighting, and infotainment power inputs-subject to system-level validation per OEM requirements.
How does the M3 suffix differ from E3 in SMCJ85CA-M3/9AT?
The M3 suffix in SMCJ85CA-M3/9AT indicates a halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance, whereas E3 denotes standard RoHS compliance without halogen-free assurance. Both meet J-STD-002 solderability, but M3 is specified for applications requiring strict halogen content control-common in automotive and industrial OEM supply chains with material declaration mandates.
What PCB pad layout is recommended for optimal thermal performance of SMCJ85CA-M3/9AT?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area for each terminal of SMCJ85CA-M3/9AT to achieve rated power dissipation and thermal derating. This layout ensures adequate heat spreading from the SMC (DO-214AB) package, supporting the 75 °C/W junction-to-ambient thermal resistance and enabling reliable operation at full 6.5 W steady-state power dissipation when ambient temperature is ≤50 °C.
SMCJ85CA-M3/9AT 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 (SMC)
SMCJ85CA-M3/9AT FAQ
1.How can I place an order for SMCJ85CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CA-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCJ85CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CA-M3/9AT?
SMCJ85CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CA-M3/9AT 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-M3/9AT?
For technical support, including SMCJ85CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ85CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85CA-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85CA-M3/9AT?
All SMCJ85CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CA-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CA-M3/9AT Tags
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