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Vishay General Semiconductor - Diodes Division SMC5K85A-M3/I
- Part No.:
- SMC5K85A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K85A-M3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
SMC5K85A-M3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR), 137 V clamping voltage at 36.5 A (10/1000 μs), 5000 W peak pulse power, and AEC-Q101 qualification for industrial-grade applications.
For engineers reviewing the SMC5K85A-M3/I datasheet, SMC5K85A-M3/I pinout, SMC5K85A-M3/I application, or SMC5K85A-M3/I equivalent, this device is selected for robust overvoltage protection in automotive sensor interfaces, industrial motor drives, telecom power rails, and DC-DC converter input stages where fast response (<1 ns), low clamping ratio, and stable thermal performance up to 150 °C are critical.
Technical Context
This TVS diode operates as a unidirectional clamping device, triggered when reverse voltage exceeds VBR (94.4–104 V), diverting surge current away from protected circuitry via low incremental surge resistance. Its 10/1000 μs waveform rating of 5000 W and 8/20 μs rating of 177 A reflect capability against lightning-induced transients and inductive switching spikes.
Thermal design is supported by RthJA = 90 °C/W and RthJM = 4.0 °C/W, enabling reliable operation under sustained surge duty cycles. The device meets IEC 61000-4-2 ESD immunity (±30 kV contact/air), UL 497B recognition (E136766), and J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 72–85 V DC systems. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Tight breakdown tolerance ensures predictable turn-on across temperature and production lot. |
| VC @ IPPM (10/1000 μs) | 137 V at 36.5 A - Clamping voltage directly limits stress on downstream MOSFETs or ICs during 10/1000 μs surges. |
| PPPM | 5000 W - Peak pulse power handling capacity for standardized 10/1000 μs waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - Maximum junction temperature rating supports operation in under-hood automotive and industrial enclosures without derating. |
| ESD Rating | ±30 kV (HBM, contact/air) - Meets IEC 61000-4-2 for system-level ESD robustness without external shielding. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 3.20 mm × 6.22 mm footprint and 2.06 mm height; compatible with automated assembly. |
Pinout & Package
SMC5K85A-M3/I uses the standard SMC (DO-214AB) package: cathode indicated by a color band at one end; anode at opposite end. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, with JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., +12 V rail); conducts transient current to ground during overvoltage events. |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping loop with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects only against negative-going transients on positive rails-ideal for DC power line suppression without affecting normal forward bias operation. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in downstream MOSFETs and controllers. |
| AEC-Q101 qualified (industrial grade) | Validated for extended temperature cycling (-55 °C to +150 °C), mechanical shock, and humidity exposure-suitable for harsh-environment industrial control units. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets global environmental compliance requirements without compromising surge performance or thermal reliability. |
| UL 497B recognized (E136766) | Enables use in safety-critical telecom and industrial power supplies requiring certified transient protection components. |
Applications
| Automotive Sensor Interface | Industrial Motor Drive Power Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and Hall-effect sensors from load-dump and alternator ripple in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor supply rail and chassis ground to clamp transients before they reach sensitive analog front-ends. Use Value: Prevents sensor output corruption and microcontroller reset events caused by >100 V transients, maintaining functional safety integrity. |
Use Scenario: Safeguarding rectified AC input stage of variable-frequency drives exposed to inductive kickback from contactor switching. IC Role / Device Role / Timing Role: Primary surge clamp on DC bus (+300–400 V nominal), absorbing energy from IGBT turn-off spikes and grid surges. Use Value: Extends electrolytic capacitor life and avoids IGBT desaturation faults by limiting voltage overshoot to ≤137 V during 36.5 A transients. |
| Telecom DC Power Distribution | Industrial PLC Analog Input Protection |
Use Scenario: Shielding -48 V telecom power feeds from lightning-induced surges entering via outdoor cabling or shared grounding paths. IC Role / Device Role / Timing Role: Bidirectionally configured (using two devices) or unidirectionally placed on positive rail to clamp common-mode surges to ground. Use Value: Maintains uninterrupted service during ±1 kV/500 A 8/20 μs surges per IEC 61000-4-5, meeting GR-1089-CORE requirements. |
Use Scenario: Guarding 4–20 mA current-loop inputs in programmable logic controllers against field-wiring faults and ESD events during maintenance. IC Role / Device Role / Timing Role: Low-leakage (1 μA at 85 V) TVS placed across input terminals to shunt transients while preserving measurement accuracy. Use Value: Ensures <0.1% full-scale error impact during 30 kV ESD strikes, eliminating need for recalibration after field servicing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ85A | Same VWM (85 V), identical SMC package, but lower PPPM (400 W vs. 5000 W) and higher VC (139 V at 28.7 A). | Rated for lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load-dump scenarios. | Select SMC5K85A-M3/I when 5000 W surge handling and 36.5 A peak current capability are required. |
| ON Semiconductor 1.5KE85A | Through-hole DO-201 package (not SMC), same VWM/VBR range, but higher thermal resistance (RthJA ≈ 15 °C/W vs. 90 °C/W) and no AEC-Q101 qualification. | Requires PCB real estate for axial leads; lacks automotive qualification and surface-mount compatibility. | Choose SMC5K85A-M3/I for automated SMT assembly, space-constrained designs, and AEC-Q101–mandated environments. |
Compared with SMAJ85A and 1.5KE85A, the SMC5K85A-M3/I delivers 12.5× higher peak pulse power in a surface-mount package with automotive-grade reliability, making it the preferred choice for high-surge industrial and automotive power-line protection where board space, thermal management, and qualification compliance are critical.
Availability
SMC5K85A-M3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial motor drives, telecom power supplies, and PLC analog input circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMC5K85A-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMC5K85A-M3/I belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for industrial and automotive systems demanding robust, standardized, and qualification-backed surge protection on DC power and signal lines.
FAQ
What is the maximum clamping voltage of the SMC5K85A-M3/I under a 10/1000 μs surge?
The SMC5K85A-M3/I has a maximum clamping voltage (VC) of 137 V at 36.5 A for a 10/1000 μs waveform. This value is measured per Figure 3 in the official Vishay datasheet (Doc. #87742, Rev. 09-Jan-2024) and represents the peak voltage seen across the device during standardized surge testing-critical for ensuring downstream components remain within safe operating voltage limits.
Is the SMC5K85A-M3/I qualified for automotive applications?
The SMC5K85A-M3/I is rated for industrial-grade use per Vishay documentation; only SMC5K10A–SMC5K20A variants carry the HM3 suffix and AEC-Q101 qualification. The SMC5K85A-M3/I itself is not AEC-Q101 qualified, though it shares the same SMC package, thermal specs, and surge ratings-making it suitable for non-automotive industrial and telecom applications requiring high-energy clamping.
What does the "M3" suffix indicate in SMC5K85A-M3/I?
The "M3" suffix in SMC5K85A-M3/I denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD 201 Class 2 whisker resistance requirements. It also indicates packaging in 13-inch plastic tape and reel (3500 units per reel), distinguishing it from the "H" variant (7-inch reel, 850 units).
Can the SMC5K85A-M3/I be used for bidirectional transient protection?
No-the SMC5K85A-M3/I is a unidirectional TVS diode, intended for protection on positive DC rails only. For bidirectional protection (e.g., AC lines or data buses), two SMC5K85A-M3/I devices must be connected in series opposition, or a dedicated bidirectional part like SMC5K85CA should be selected instead.
What is the thermal resistance junction-to-ambient (RthJA) for the SMC5K85A-M3/I?
The SMC5K85A-M3/I has a typical thermal resistance junction-to-ambient (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 essential for calculating steady-state temperature rise during repetitive surge events or elevated ambient conditions.
SMC5K85A-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:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K85A-M3/I FAQ
1.How can I place an order for SMC5K85A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K85A-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 SMC5K85A-M3/I reliable?
The price and inventory of SMC5K85A-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 SMC5K85A-M3/I is usually 5 days.
3.What payment methods are accepted for SMC5K85A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K85A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K85A-M3/I?
SMC5K85A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K85A-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 SMC5K85A-M3/I?
For technical support, including SMC5K85A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K85A-M3/I requirements.
6.How does Aetrix verify that SMC5K85A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMC5K85A-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 SMC5K85A-M3/I meets industry standards.
7.What is the process for return or replacement of SMC5K85A-M3/I?
All SMC5K85A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K85A-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 SMC5K85A-M3/I part is unused and in its original packaging.
Return procedure for SMC5K85A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K85A-M3/I Tags
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DESD3V3E1BL-7B
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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