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Vishay General Semiconductor - Diodes Division SMC3K33CA-M3/9A
- Part No.:
- SMC3K33CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K33CA-M3/9A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,313
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Product details
Overview
SMC3K33CA-M3/9A from Vishay General Semiconductor is a bidirectional surface-mount TRANSZORB® transient voltage suppressor in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 33 V standoff voltage, and 53.3 V clamping voltage at 56.3 A peak surge current. It provides robust ESD and lightning-induced transient protection for automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMC3K33CA-M3/9A datasheet, SMC3K33CA-M3/9A pinout, SMC3K33CA-M3/9A application, or SMC3K33CA-M3/9A equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, 150 °C max junction temperature, and compatibility with wave-soldering process constraints.
Technical Context
This device operates as a voltage-clamped crowbar during transients, triggering when reverse voltage exceeds its 36.7–40.6 V breakdown range at 1 mA test current. Its low incremental surge resistance ensures stable clamping performance under repetitive 10/1000 μs surges up to 3000 W.
Designed for automotive-grade reliability, SMC3K33CA-M3/9A meets AEC-Q101 stress testing requirements and UL 497B safety recognition (E136766). The M3 suffix denotes halogen-free, RoHS-compliant commercial-grade construction with JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains high-energy transients without failure in automotive load-dump or inductive switching events |
| Standoff Voltage (VWM) | 33 V - blocks normal operating signals up to this DC or RMS voltage while remaining non-conductive |
| Clamping Voltage (VC) | 53.3 V at 56.3 A - limits downstream IC voltage to safe level during surge, protecting 3.3 V/5 V logic and analog front-ends |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - defines precise conduction onset threshold for predictable transient response |
| Operating Temperature | −55 °C to +150 °C - supports under-hood and industrial control environments without derating |
| Polarity | Bidirectional - protects AC-coupled or differential signal paths such as CAN, LIN, or sensor bridges |
| Package | SMC (DO-214AB) - industry-standard 8.0 mm × 8.0 mm copper pad footprint compatible with automated SMT assembly |
Pinout & Package
SMC3K33CA-M3/9A uses a 2-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (unmarked end) | Transient current return path | Connected to system ground or low-impedance reference plane to sink surge energy safely |
| Anode (unmarked end) | Transient current input node | Placed in series with protected line (e.g., sensor output or bus line) to clamp overvoltage before IC input |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating signal pairs without polarity concerns |
| AEC-Q101 qualification | Validates reliability for automotive electronics including engine control modules and ADAS sensors |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking preconditioning |
| UL 497B recognition (E136766) | Confirms compliance with safety standards for telecom and industrial surge protection circuits |
| Halogen-free & RoHS | Meets environmental compliance requirements for global OEM supply chains and WEEE directives |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine bay or chassis modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between sensor output and microcontroller ADC input. Use Value: Limits clamped voltage to 53.3 V, preventing latch-up or gate oxide damage to 3.3 V/5 V MCU inputs during ISO 7637-2 pulse 1/2a/5a events. |
Use Scenario: Shielding RS-485 or 4–20 mA transmitter outputs against EFT and surge in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS connected across differential signal pair or signal-to-ground. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while surviving 3000 W pulses per IEC 61000-4-5. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
Use Scenario: Safeguarding primary-side controller ICs in AC-DC adapters exposed to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Parallel-connected TVS across bridge rectifier output or bulk capacitor. Use Value: Absorbs 3000 W peak energy without degradation, enabling compact design versus multi-stage MOV+TVS solutions. |
Use Scenario: Protecting Ethernet PHY or DSL line drivers from induced surges on outdoor-facing telecom ports. IC Role / Device Role / Timing Role: Bidirectional clamping device installed at connector interface before signal conditioning circuitry. Use Value: Meets GR-1089-CORE Level 3 surge immunity with 53.3 V clamping, preserving signal amplitude margin for 10/100BASE-TX. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K33CAHM3/9A | AEC-Q101 qualified variant with identical electrical specs; HM3 suffix indicates automotive-grade qualification and same SMC package | Required for automotive production programs needing formal AEC-Q101 documentation and traceability | Select SMC3K33CAHM3/9A when automotive PPAP or long-term reliability validation is mandated |
| SMC3K36CA-M3/9A | Higher 36 V standoff and 58.1 V clamping voltage; otherwise identical package, power rating, and construction | Suitable where system operating voltage margin allows higher VWM, e.g., 24 V nominal industrial buses | Choose SMC3K36CA-M3/9A when protecting 24 V systems with tighter clamping margin above rail |
Compared with SMC3K33CA-M3/9A, SMC3K33CAHM3/9A adds formal automotive qualification without electrical change, while SMC3K36CA-M3/9A trades 3 V higher standoff for 4.8 V higher clamping-enabling better noise immunity in 24 V systems but requiring verification of downstream IC absolute maximum ratings.
Availability
SMC3K33CA-M3/9A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line card surge suppression requiring stable component supply and full traceability.
Supply support for SMC3K33CA-M3/9A 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 SMC3KxxCA family delivers standardized 3000 W transient suppression in SMC packages for cost-sensitive yet robust protection across automotive, industrial, and telecom applications-designed to replace legacy P6KE and SMAJ series with improved power density and qualification coverage.
FAQ
Is SMC3K33CA-M3/9A suitable for new automotive designs?
No-Vishay explicitly marks SMC3K33CA-M3/9A as "Not for New Designs" in its datasheet (Rev. 13-Sep-2022). For new automotive projects, use the AEC-Q101-qualified SMC3K33CAHM3/9A instead. SMC3K33CA-M3/9A remains available for legacy production and industrial applications where AEC-Q101 is not required.
What is the clamping voltage of SMC3K33CA-M3/9A at its rated peak pulse current?
The clamping voltage of SMC3K33CA-M3/9A is 53.3 V measured at 56.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed per Vishay's Electrical Characteristics table and defines the maximum voltage seen by downstream circuitry during surge events.
Does SMC3K33CA-M3/9A have polarity markings on the package?
No-SMC3K33CA-M3/9A is a bidirectional TVS and carries no polarity marking on the SMC (DO-214AB) case. Both terminals are functionally symmetric; orientation during PCB placement does not affect electrical performance. Polarity identification is unnecessary for correct circuit integration.
Can SMC3K33CA-M3/9A be used in wave soldering processes?
No-Vishay explicitly states "Not recommended for PCB bottom side wave mounting" due to thermal mass and package geometry limitations. Reflow soldering is the preferred assembly method. If wave soldering is unavoidable, strict thermal profiling and selective masking must be applied to avoid exceeding 150 °C junction temperature.
What safety certifications does SMC3K33CA-M3/9A hold?
SMC3K33CA-M3/9A holds UL 497B recognition with file number E136766 for transient protection applications, and complies with material requirements per Vishay's document 99912. It is not UL-listed as a standalone protective component but qualifies as a recognized component for use in certified end equipment.
SMC3K33CA-M3/9A 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):
- 56.3A
- Power - Peak Pulse:
- 3000W (3kW)
- 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 (SMCJ)
SMC3K33CA-M3/9A FAQ
1.How can I place an order for SMC3K33CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K33CA-M3/9A 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 SMC3K33CA-M3/9A reliable?
The price and inventory of SMC3K33CA-M3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K33CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K33CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K33CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K33CA-M3/9A?
SMC3K33CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K33CA-M3/9A 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 SMC3K33CA-M3/9A?
For technical support, including SMC3K33CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K33CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K33CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K33CA-M3/9A 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 SMC3K33CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K33CA-M3/9A?
All SMC3K33CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K33CA-M3/9A, 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 SMC3K33CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K33CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K33CA-M3/9A Tags
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