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Vishay General Semiconductor - Diodes Division SMC5K85A-M3/H
- Part No.:
- SMC5K85A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K85A-M3/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,717
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Product details
Overview
SMC5K85A-M3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 5000 W peak pulse power (10/1000 μs), 85 V stand-off voltage (VWM), and 137 V maximum clamping voltage at 36.5 A IPPM - deployed on power rails and signal lines of industrial motor drives and sensor interfaces.
For engineers reviewing the SMC5K85A-M3/H datasheet, SMC5K85A-M3/H pinout, SMC5K85A-M3/H application, or SMC5K85A-M3/H equivalent, this device delivers verified AEC-Q101 qualification (for automotive-grade variants), UL 497B safety recognition, MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance - critical for high-reliability industrial and automotive ESD/surge protection design.
Technical Context
This TVS diode operates as a clamping-type transient protector, leveraging avalanche breakdown to limit overvoltage events. Its unidirectional polarity enables integration into DC-biased circuits such as 24 V/48 V industrial power supplies and CAN bus termination networks without reverse conduction concerns.
Rated for -55 °C to +150 °C junction temperature, it features low incremental surge resistance and fast response time (<1 ns), ensuring effective suppression of inductive switching transients and lightning-induced surges per IEC 61000-4-2 (30 kV contact/air discharge). Thermal resistance RthJA is 90 °C/W on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 72–85 V nominal systems. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM (10/1000 μs) | 137 V at 36.5 A - clamping voltage under standard surge waveform; determines protected circuit's maximum transient stress level. |
| PPPM | 5000 W (10/1000 μs) - peak pulse power handling capacity; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - maximum junction temperature rating; enables operation in enclosed industrial enclosures without derating below full power. |
| ESD immunity | 30 kV HBM (contact & air) - exceeds IEC 61000-4-2 requirements; protects downstream ICs during handling and system-level ESD events. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, halogen-free and RoHS-compliant (M3 suffix). Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path when cathode is biased above VWM. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail or sensor output); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables use in DC-biased applications without reverse leakage issues; avoids unintended conduction in negative half-cycles. |
| 5000 W peak pulse power (10/1000 μs) | Supports sustained surge energy absorption in industrial motor control and PLC I/O modules without thermal runaway. |
| AEC-Q101 qualified variant available | Confirms reliability for automotive subsystems (though SMC5K85A itself is industrial grade; HM3 suffix required for AEC-Q101). |
| UL 497B recognized (E136766) | Validates safety compliance for telecom and industrial equipment requiring certified transient protection components. |
| MSL Level 1, 260 °C reflow compatible | Permits standard SMT assembly without pre-baking; eliminates moisture-related popcorning risk during reflow. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors in 48 V BLDC motor inverters exposed to inductive kickback. IC Role / Device Role / Timing Role: Clamping transient spikes on high-side FET source lines and current-sense amplifier inputs. Use Value: Limits voltage excursion to ≤137 V during 36.5 A surges, preserving SiC MOSFET gate oxide integrity and ADC front-end accuracy. |
Use Scenario: Surge suppression on LIN bus lines and door module power inputs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Fast-response shunt element absorbing 8/20 μs transients up to 177 V at 226 A. Use Value: Maintains communication continuity by clamping transients below microcontroller I/O absolute maximum ratings (typically 36 V). |
| Telecom Power Feeds | Factory Automation Sensors |
|
Use Scenario: Input-stage protection for PoE-powered remote units connected to long copper runs vulnerable to lightning induction. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V DC feed before DC-DC converter input. Use Value: Withstands 5000 W pulses while holding clamped voltage below 137 V, preventing upstream converter latch-up or capacitor overvoltage. |
Use Scenario: Protection of analog outputs (4–20 mA) and digital I/O (RS-485) on industrial pressure/temperature transmitters mounted near EMI sources. IC Role / Device Role / Timing Role: Bidirectional-capable interface protection via unidirectional placement with proper biasing. Use Value: Delivers <1 ns response and 30 kV ESD immunity, ensuring signal integrity and zero downtime during factory floor electrostatic 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 |
|---|---|---|---|
| Littelfuse SMAJ85A | Same SMC package, 85 V VWM, but lower PPPM (400 W vs. 5000 W); clamping voltage 137 V at 29.1 A. | Not suitable for high-energy surges (e.g., IEC 61000-4-5 Level 4); limited to low-power signal-line protection. | Select only for cost-sensitive, low-surge environments where 5000 W capability is unnecessary. |
| ON Semiconductor 1.5KE85A | Through-hole DO-201 package, identical VWM/VC specs, but higher thermal resistance (RthJA ≈ 120 °C/W) and no MSL Level 1 rating. | Requires manual soldering or wave soldering; incompatible with automated SMT lines and high-density layouts. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMC5K85A-M3/H, SMAJ85A offers lower surge capacity and reduced robustness for industrial mains-connected equipment, while 1.5KE85A sacrifices SMT manufacturability and thermal performance - making SMC5K85A-M3/H the optimal choice for high-volume, high-reliability SMT surge protection.
Availability
SMC5K85A-M3/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom power feeds, factory automation sensors, and automotive body control modules requiring stable component supply with full traceability and lifecycle management.
Supply support for SMC5K85A-M3/H 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The SMC5KxxA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh electromagnetic environments - emphasizing clamping precision, surge endurance, and process consistency.
FAQ
What is the maximum clamping voltage of the SMC5K85A-M3/H under a 10/1000 μs surge?
The SMC5K85A-M3/H has a maximum clamping voltage (VC) of 137 V at 36.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 3 in the Vishay datasheet (Document Number: 87742) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMC5K85A-M3/H maintains this clamping performance across its rated junction temperature range (-55 °C to +150 °C), with minor derating above 25 °C ambient.
Is the SMC5K85A-M3/H AEC-Q101 qualified?
No, the SMC5K85A-M3/H is not AEC-Q101 qualified. Per the Vishay datasheet, AEC-Q101 qualification applies only to SMC5K10A through SMC5K20A with the HM3 suffix (e.g., SMC5K20AHM3_A/H). The SMC5K85A-M3/H is designated for industrial-grade applications and carries M3 (halogen-free, RoHS-compliant) and MSL Level 1 ratings, but lacks automotive qualification documentation or test reports.
What does the "-M3/H" suffix indicate in SMC5K85A-M3/H?
The "-M3/H" suffix in SMC5K85A-M3/H specifies two key attributes: "M3" denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance, and "H" indicates packaging in 7-inch diameter plastic tape and reel with a base quantity of 850 units. This ordering code aligns with Vishay's preferred package coding system documented in the "Ordering Information" section of datasheet 87742.
Can the SMC5K85A-M3/H be used in bidirectional protection circuits?
No, the SMC5K85A-M3/H is a unidirectional TVS diode and is not suitable for bidirectional protection without external circuitry. Its electrical characteristics - including specified VBR, VWM, and VC - apply only to forward-biased (cathode-positive) operation. For AC or bipolar signal lines, a dedicated bidirectional TVS (e.g., SMC5K85CA) or back-to-back unidirectional configuration would be required; using SMC5K85A-M3/H alone risks reverse breakdown failure.
What is the thermal resistance junction-to-ambient (RthJA) for the SMC5K85A-M3/H?
The thermal resistance junction-to-ambient (RthJA) for the SMC5K85A-M3/H is 90 °C/W, measured per JEDEC 51-2A on a standard FR4 PCB with 2 oz. copper and the recommended mounting pad layout. This value assumes natural convection cooling and directly impacts power derating above 25 °C ambient - for example, at 75 °C ambient, the device must be derated to ~56% of its 5000 W peak pulse rating to maintain TJ ≤ 150 °C.
SMC5K85A-M3/H 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/H FAQ
1.How can I place an order for SMC5K85A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K85A-M3/H 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/H reliable?
The price and inventory of SMC5K85A-M3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMC5K85A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K85A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K85A-M3/H?
SMC5K85A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K85A-M3/H 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/H?
For technical support, including SMC5K85A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K85A-M3/H requirements.
6.How does Aetrix verify that SMC5K85A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K85A-M3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMC5K85A-M3/H?
All SMC5K85A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K85A-M3/H, 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/H part is unused and in its original packaging.
Return procedure for SMC5K85A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K85A-M3/H Tags
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