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Vishay General Semiconductor - Diodes Division SMC5K33CA-M3/H
- Part No.:
- SMC5K33CA-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K33CA-M3/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,569
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Product details
Overview
SMC5K33CA-M3/H 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 5000 W peak pulse power (10/1000 μs), 33 V stand-off voltage (VWM), and 53.3 V maximum clamping voltage at 93.8 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMC5K33CA-M3/H datasheet, SMC5K33CA-M3/H pinout, SMC5K33CA-M3/H application, or SMC5K33CA-M3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RthJA = 90 °C/W), junction temperature range (–55 to +175 °C), and UL 497B safety recognition - all critical for robust overvoltage design validation.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltage events, leveraging avalanche breakdown to divert surge current away from sensitive downstream circuitry. Its bidirectional configuration enables symmetrical clamping on both polarities without polarity marking, supporting AC-coupled or floating signal paths.
It delivers 5000 W peak pulse power under 10/1000 μs waveform and 40 kW under 8/20 μs waveform, with low incremental surge resistance ensuring stable clamping performance across repetitive surges. The device meets J-STD-020 MSL Level 1 and passes JESD 201 Class 2 whisker testing, confirming suitability for lead-free reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 36.7 V / 40.6 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on above system operating voltage. |
| VC @ IPPM | 53.3 V - Clamping voltage at 93.8 A (10/1000 μs); limits protected node voltage during worst-case surge. |
| PPPM | 5000 W - Peak pulse power handling capability; supports high-energy transients like ISO 7637-2 Pulse 5a. |
| TJ max. | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RthJA | 90 °C/W - Junction-to-ambient thermal resistance on FR4 PCB; informs heatsinking requirements for sustained surge duty. |
| ESD Rating | ±30 kV - Human body model (HBM) contact and air discharge; exceeds IEC 61000-4-2 Level 4 immunity. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no cathode band. Matte tin-plated leads, halogen-free, RoHS-compliant, and qualified to AEC-Q101.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; no polarity orientation required during placement - simplifies layout and eliminates assembly errors. |
| Cathode (not marked) | Clamping reference node | Absence of cathode band confirms bidirectional operation; device clamps equally on positive and negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or differential buses without polarity constraints. |
| 5000 W (10/1000 μs) peak pulse power | Withstands automotive load-dump and inductive switching surges per ISO 7637-2 without degradation. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. |
| UL 497B recognition (E136766) | Confirms compliance with safety standards for telecom and industrial signal-line protection applications. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V power rails in engine control units against load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Primary clamping element placed at power entry point to limit rail voltage excursion. Use Value: Clamps to 53.3 V at 93.8 A, preventing damage to downstream DC-DC converters and microcontrollers rated for ≤60 V absolute maximum. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and cable-induced surges in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) shunt protector placed adjacent to connector. Use Value: Sub-1 ns response time and ±30 kV HBM rating ensure signal integrity remains intact after repeated electrostatic discharges. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Inputs |
Use Scenario: Safeguarding Ethernet PHY interface power pins (e.g., PoE midspan) from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after primary gas discharge tube (GDT) to refine clamping level. Use Value: 40 kW (8/20 μs) rating handles residual energy passed through upstream GDT, limiting voltage to <70 V. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, power tools). IC Role / Device Role / Timing Role: Snubber-style clamp across motor terminals to absorb inductive kickback. Use Value: 175 °C max junction temperature allows direct mounting near hot motor windings without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-M3/87A | Lower peak pulse power (600 W vs. 5000 W); SMB (DO-214AA) package; same VWM/VC but higher RthJA (110 °C/W). | Suitable only for low-energy ESD or board-level coupling events - not for automotive load-dump or industrial lightning surges. | Select when space-constrained layouts require smaller footprint and surge threat level is limited to IEC 61000-4-2. |
| SMCJ33CA-E3/57T | Same SMC package and 5000 W rating, but non-AEC-Q101, non-UL-recognized, and higher leakage (5 μA vs. 1 μA at VWM). | Acceptable for industrial/commercial use where automotive qualification or safety certification is not mandated. | Choose for cost-sensitive non-automotive designs where full AEC-Q101 and UL 497B compliance are unnecessary. |
Compared with SMC5K33CA-M3/H, SMBJ33CA-M3/87A offers compact size but insufficient energy handling for harsh environments, while SMCJ33CA-E3/57T matches power capability but lacks automotive qualification and safety listing - making SMC5K33CA-M3/H the sole choice for AEC-Q101-compliant, UL-recognized 33 V TVS protection in mission-critical systems.
Availability
SMC5K33CA-M3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge protection, and consumer appliance motor drive inputs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMC5K33CA-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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMC5KxxCA series was engineered specifically for high-energy transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, UL safety recognition, and industry-leading 5000 W pulse power in the rugged SMC package.
FAQ
What is the clamping voltage of the SMC5K33CA-M3/H at its rated peak pulse current?
The SMC5K33CA-M3/H has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current of 93.8 A under the 10/1000 μs waveform. This value is measured per Figure 3 in the Vishay datasheet (Document Number: 87024) and defines the upper voltage limit imposed on protected circuitry during a standardized surge event. The SMC5K33CA-M3/H maintains this clamping performance across its specified operating temperature range.
Is the SMC5K33CA-M3/H qualified for automotive applications?
Yes, the SMC5K33CA-M3/H is explicitly AEC-Q101 qualified, as confirmed in the Vishay datasheet revision dated 10-Sep-2024. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive electronics. The SMC5K33CA-M3/H also meets J-STD-020 MSL Level 1 for lead-free reflow compatibility.
Does the SMC5K33CA-M3/H have polarity markings on the package?
No, the SMC5K33CA-M3/H does not feature a cathode band or other polarity marking because it is a bidirectional TVS diode. Its symmetrical construction allows either terminal to serve as anode or cathode depending on transient polarity, eliminating orientation requirements during PCB placement. This is explicitly noted in the "Polarity" section of the Vishay datasheet (Document Number: 87024).
What is the maximum junction temperature rating for the SMC5K33CA-M3/H?
The SMC5K33CA-M3/H has a maximum junction temperature (TJ) rating of +175 °C, as specified in the "Maximum Ratings" table of the Vishay datasheet. This high-temperature capability supports deployment in demanding environments such as automotive engine compartments or industrial motor drives where ambient temperatures exceed 125 °C. Derating curves in Figure 2 confirm usable power dissipation down to –55 °C.
How does the SMC5K33CA-M3/H compare to standard ESD suppressors in terms of surge energy handling?
The SMC5K33CA-M3/H is engineered for high-energy transients - delivering 5000 W (10/1000 μs) and 40 kW (8/20 μs) peak pulse power - far exceeding typical ESD suppressors rated for ≤500 W. While ESD devices target fast, low-energy events (e.g., ±8 kV contact), the SMC5K33CA-M3/H addresses destructive inductive switching and lightning surges. Its 53.3 V clamping voltage and 93.8 A IPPM make the SMC5K33CA-M3/H appropriate for system-level protection, not just component-level ESD.
SMC5K33CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 93.8A
- 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)
SMC5K33CA-M3/H FAQ
1.How can I place an order for SMC5K33CA-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K33CA-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 SMC5K33CA-M3/H reliable?
The price and inventory of SMC5K33CA-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 SMC5K33CA-M3/H is usually 5 days.
3.What payment methods are accepted for SMC5K33CA-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K33CA-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K33CA-M3/H?
SMC5K33CA-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K33CA-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 SMC5K33CA-M3/H?
For technical support, including SMC5K33CA-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K33CA-M3/H requirements.
6.How does Aetrix verify that SMC5K33CA-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K33CA-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 SMC5K33CA-M3/H meets industry standards.
7.What is the process for return or replacement of SMC5K33CA-M3/H?
All SMC5K33CA-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K33CA-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 SMC5K33CA-M3/H part is unused and in its original packaging.
Return procedure for SMC5K33CA-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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