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Vishay General Semiconductor - Diodes Division SMC5K85CA-M3/I
- Part No.:
- SMC5K85CA-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K85CA-M3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,241
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Product details
Overview
SMC5K85CA-M3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 85 V stand-off voltage (VWM), 137 V max clamping voltage at 36.5 A (10/1000 μs), and 5000 W peak pulse power. It protects MOSFETs, sensor signal lines, and ICs in automotive and industrial power rails against lightning-induced surges and inductive switching transients.
For engineers reviewing the SMC5K85CA-M3/I datasheet, SMC5K85CA-M3/I pinout, SMC5K85CA-M3/I application, or SMC5K85CA-M3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 175 °C maximum junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly using matte tin-plated leads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown range (94.4–104 V), it avalanches to divert surge current away from downstream circuitry. Its bidirectional structure enables symmetric protection on AC-coupled or floating lines without polarity sensitivity.
Designed for high-energy transients, it delivers 5000 W peak pulse power under 10/1000 μs waveform and sustains 40 kW under 8/20 μs waveform-validated per IEC 61000-4-2 ESD (30 kV contact/air). Thermal performance is characterized by RthJA = 90 °C/W and RthJM = 4.0 °C/W, supporting reliable operation up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 94.4 V / 104 V - Breakdown voltage range at 1 mA test current; ensures consistent avalanche initiation across production lots. |
| VC @ IPPM | 137 V @ 36.5 A (10/1000 μs) - Clamping voltage during worst-case surge; limits stress on protected ICs to safe levels. |
| PPPM | 5000 W - Peak pulse power handling capacity; determines survivability against standardized lightning surges (IEC 61000-4-5). |
| TJ max | +175 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| ESD Rating | 30 kV HBM (contact & air) - Meets IEC 61000-4-2 Level 4; provides robust electrostatic discharge immunity at board level. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, M3 suffix denotes industrial grade with JESD 201 Class 2 whisker resistance and JEDEC MSL Level 1 rating (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge current return path (bidirectional) | No cathode band marking; terminals are functionally symmetric-either end serves as current sink during positive or negative transients. |
| Anode (Cathode) | Surge current entry point (bidirectional) | Identical terminal construction; bidirectional operation eliminates need for orientation-aware placement in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signal lines, differential buses, or floating power domains without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock-supports under-hood and ADAS applications. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive gate drivers and ADC inputs. |
| UL 497B recognition (E136766) | Confirms compliance with telecom surge protection safety standards-enables use in certified communication interface modules. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load-dump and alternator switching transients. IC Role / Device Role / Timing Role: Shunt TVS device clamping voltage spikes before they reach microcontroller power rails or CAN transceivers. Use Value: Withstands 5000 W pulses and operates up to 175 °C, enabling direct placement near fuse boxes or power switches without derating. | Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at connector interface to limit common-mode transients on twisted-pair sensor cables. Use Value: 85 V VWM matches typical 24 V industrial supply headroom; 137 V clamping prevents damage to 16-bit ADC front-ends. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Surge protection on POTS or DSL line cards exposed to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Primary shunt protector on tip/ring lines meeting UL 497B requirements for telecom safety certification. Use Value: UL recognition file E136766 and 30 kV ESD rating satisfy IEC 61000-4-5 and -4-2 compliance for Class B equipment. | Use Scenario: Safeguarding half-bridge MOSFET gates in washing machine motor inverters against inductive kickback. IC Role / Device Role / Timing Role: Fast-response TVS placed across gate-source terminals to clamp Miller-induced voltage spikes. Use Value: Sub-1 ns response time and low dynamic impedance ensure gate oxide integrity during 40 kW 8/20 μs surges. |
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-M3/8A | Lower peak pulse power (600 W vs. 5000 W); SMB package (smaller footprint, higher RthJA = 110 °C/W). | Not suitable for lightning-level surges; limited to low-energy ESD or local switching noise. | Select only for space-constrained consumer designs where surge energy is below 100 mJ. |
| SMC5K85CAHM3/I | Identical electrical specs; HM3 suffix indicates AEC-Q101 qualification (vs. M3 industrial grade). | Required for automotive OEM programs mandating full AEC-Q101 documentation traceability. | Choose HM3 version when automotive PPAP submission or zero-defect field reliability is contractually required. |
Compared with SMC5K85CA-M3/I, SMBJ85CA-M3/8A offers smaller size but cannot handle high-energy transients, while SMC5K85CAHM3/I provides identical protection with enhanced automotive qualification-making the M3 variant optimal for cost-sensitive industrial applications where AEC-Q101 is not mandated.
Availability
SMC5K85CA-M3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and appliance motor control requiring stable component supply across extended production lifecycles.
Supply support for SMC5K85CA-M3/I 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 high-reliability, high-power, and automotive-qualified components.
The SMC5KxxCA family is engineered for robust transient suppression in harsh environments-designed to meet AEC-Q101, UL 497B, and IEC 61000-4-x standards for automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum clamping voltage of the SMC5K85CA-M3/I under a 10/1000 μs surge?
The SMC5K85CA-M3/I has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 36.5 A under the 10/1000 μs waveform. This value is measured per Fig.3 in Vishay document 87024 and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is the SMC5K85CA-M3/I suitable for automotive applications?
The SMC5K85CA-M3/I is qualified to AEC-Q101 standards, confirmed in Vishay document 87024 Section "Ratings and Characteristics Curves" footnote (1). It supports automotive use cases including power distribution modules and sensor interfaces, though the HM3 variant is preferred for full PPAP traceability in Tier-1 OEM programs.
What does the "M3" suffix indicate in SMC5K85CA-M3/I?
The "M3" suffix in SMC5K85CA-M3/I denotes halogen-free, RoHS-compliant construction with industrial-grade qualification, including JESD 201 Class 2 whisker resistance and MSL Level 1 moisture sensitivity rating (260 °C peak reflow). It distinguishes this part from the HM3 automotive-qualified version.
Does the SMC5K85CA-M3/I have polarity markings on the package?
No, the SMC5K85CA-M3/I is a bidirectional TVS diode and carries no cathode band or polarity marking. Its DO-214AB (SMC) package features symmetric terminals, allowing either end to serve as anode or cathode depending on transient polarity-simplifying PCB layout and eliminating orientation errors.
What is the thermal resistance from junction to ambient (RthJA) for the SMC5K85CA-M3/I?
The SMC5K85CA-M3/I has a typical junction-to-ambient thermal resistance (RthJA) of 90 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A. This value assumes a 2 oz. copper footprint and is critical for calculating steady-state temperature rise under leakage current or repeated low-energy surges.
SMC5K85CA-M3/I 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):
- 36.5A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K85CA-M3/I FAQ
1.How can I place an order for SMC5K85CA-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K85CA-M3/I 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 SMC5K85CA-M3/I reliable?
The price and inventory of SMC5K85CA-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC5K85CA-M3/I is usually 5 days.
3.What payment methods are accepted for SMC5K85CA-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K85CA-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K85CA-M3/I?
SMC5K85CA-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K85CA-M3/I 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 SMC5K85CA-M3/I?
For technical support, including SMC5K85CA-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K85CA-M3/I requirements.
6.How does Aetrix verify that SMC5K85CA-M3/I is sourced from the original manufacturer or authorized distributors?
All SMC5K85CA-M3/I 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 SMC5K85CA-M3/I meets industry standards.
7.What is the process for return or replacement of SMC5K85CA-M3/I?
All SMC5K85CA-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K85CA-M3/I, 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 SMC5K85CA-M3/I part is unused and in its original packaging.
Return procedure for SMC5K85CA-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K85CA-M3/I Tags
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