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Vishay General Semiconductor - Diodes Division SMC5K33CA-M3/I
- Part No.:
- SMC5K33CA-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K33CA-M3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,894
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Product details
Overview
SMC5K33CA-M3/I 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 IPPM - deployed on power rails and signal lines of automotive ECUs and industrial motor drives.
For engineers reviewing the SMC5K33CA-M3/I datasheet, SMC5K33CA-M3/I pinout, SMC5K33CA-M3/I application, or SMC5K33CA-M3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 175 °C junction temperature rating, and compatibility with automated SMT assembly using matte tin-plated leads per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ns to transients induced by inductive switching or lightning surges. Its bidirectional architecture enables symmetrical clamping above ±33 V without polarity sensitivity, and its low incremental surge resistance ensures stable clamping under repetitive 8/20 μs surges up to 40 kW.
The device leverages silicon avalanche breakdown physics to achieve precise VBR of 36.7–40.6 V at 1 mA test current, with thermal resistance RthJA = 90 °C/W and RthJM = 4.0 °C/W enabling reliable operation in high-power-density layouts. It meets IEC 61000-4-2 ESD immunity up to ±30 kV (contact/air).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 3.3 V–24 V system rails. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed avalanche breakdown window ensuring consistent turn-on across production lots. |
| VC @ IPPM | 53.3 V at 93.8 A (10/1000 μs) - clamping voltage limits downstream IC stress during worst-case surge events. |
| PPPM | 5000 W (10/1000 μs) - energy-handling capacity sufficient for ISO 7637-2 Pulse 1/2a/5a compliance in 12 V automotive systems. |
| TJ max | +175 °C - supports under-hood deployment in engine control modules without derating at ambient up to 125 °C. |
| Polarity | Bidirectional - eliminates orientation concerns during placement and protects AC-coupled or differential signal paths. |
| MSL Level | Level 1 (J-STD-020) - allows unlimited floor life and reflow at 260 °C peak, compatible with standard lead-free SMT processes. |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0; dimensions 7.11 mm × 6.22 mm × 2.62 mm; matte tin-plated terminals; no cathode band (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identical avalanche conduction roles; no polarity marking required for board layout or assembly. |
| Case (cathode side) | Thermal interface | Exposed metal slug provides primary heat dissipation path to PCB copper; requires thermal pad connection per JEDEC 51-14. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock per stress test plan. |
| UL 497B recognized | File E136766 confirms safety compliance for telecom and industrial signal line protection applications. |
| ESD immunity | ±30 kV per IEC 61000-4-2 (HBM/contact & air), enabling robust front-end protection without external shielding. |
| Halogen-free & RoHS | M3 suffix denotes industrial-grade halogen-free molding compound and lead-free terminations compliant with EU RoHS Directive 2011/65/EU. |
| Low clamping ratio | VC/VWM = 1.61 - tight clamping margin minimizes overvoltage exposure to protected MOSFET gates and MCU I/O pins. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protection of 12 V battery-fed power inputs in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS device clamping transient spikes to <54 V during ISO 7637-2 Pulse 5a events. Use Value: Prevents latch-up or gate oxide rupture in downstream DC-DC controllers and CAN transceivers rated for ≤40 V absolute maximum. | Use Scenario: Surge suppression on gate drive signal lines feeding IGBTs in variable-frequency drives. IC Role / Device Role / Timing Role: Fast-response voltage clamp limiting Miller-induced voltage overshoot during high-dI/dt switching transitions. Use Value: Reduces risk of false turn-on and shoot-through failure by holding gate-source voltage below 53.3 V during 8/20 μs transients. |
| Telecom Interface Protection | Consumer Sensor Hub Inputs |
Use Scenario: Secondary protection on RS-485 data lines exposed to lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional clamping element placed after primary gas discharge tube (GDT) in hybrid protection circuit. Use Value: Provides low-clamp secondary stage with sub-nanosecond response, reducing let-through voltage to <54 V before GDT fully arcs. | Use Scenario: ESD and EFT protection on analog sensor inputs (e.g., temperature, pressure) in smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing ±30 kV HBM discharges while maintaining <1 μA leakage at 33 V. Use Value: Preserves signal integrity and ADC accuracy by limiting post-ESD offset drift and preventing input-stage saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-E3/5A (Vishay) | Lower PPPM (400 W), SMA package (smaller footprint), same VWM and bidirectional polarity. | Suitable for space-constrained consumer electronics but insufficient for automotive load dump. | Select SMC5K33CA-M3/I when 5000 W surge handling and AEC-Q101 qualification are mandatory. |
| 1.5KE33CA (ON Semiconductor) | Higher VBR (36.7–40.6 V same), DO-201 package, 5000 W rating, but not AEC-Q101 qualified or MSL Level 1 rated. | Acceptable for industrial controls but not automotive under-hood use due to missing qualification and reflow profile limits. | Choose SMC5K33CA-M3/I for automotive designs requiring full AEC-Q101 validation and lead-free reflow compatibility. |
Compared with SMAJ33CA-E3/5A and 1.5KE33CA, the SMC5K33CA-M3/I delivers higher surge robustness in a thermally enhanced SMC package, with automotive-grade qualification and process compatibility that neither alternative provides - making it the only option for AEC-compliant 12 V/24 V power rail protection.
Availability
SMC5K33CA-M3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, telecom infrastructure equipment, and consumer sensor modules requiring stable component supply across long production lifecycles.
Supply support for SMC5K33CA-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, power efficiency, and application-specific performance.
The SMC5KxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 compliance are critical.
FAQ
What is the clamping voltage of the SMC5K33CA-M3/I at its rated peak pulse current?
The SMC5K33CA-M3/I has a maximum clamping voltage (VC) of 53.3 V at its specified peak pulse current (IPPM) of 93.8 A under the 10/1000 μs waveform condition. This value is measured per Fig. 3 in the Vishay datasheet 87024 and reflects the device's ability to limit transient overvoltage to protect downstream components such as microcontrollers and power MOSFETs during surge events.
Is the SMC5K33CA-M3/I suitable for automotive applications?
Yes, the SMC5K33CA-M3/I is AEC-Q101 qualified and rated for operation from –55 °C to +175 °C, making it suitable for under-hood automotive applications including engine control units, body electronics, and ADAS power supplies. Its M3 suffix indicates halogen-free, RoHS-compliant construction, and its MSL Level 1 rating supports standard lead-free reflow profiles used in automotive manufacturing.
Does the SMC5K33CA-M3/I have polarity markings on the package?
No, the SMC5K33CA-M3/I is a bidirectional TVS diode and does not feature a cathode band or other polarity marking on the SMC (DO-214AB) package. Both terminals are functionally identical, allowing unrestricted orientation during PCB placement - a key advantage for protecting AC-coupled signals or symmetric power rails where polarity reversal may occur.
What is the thermal resistance specification for the SMC5K33CA-M3/I?
The SMC5K33CA-M3/I has a typical junction-to-ambient thermal resistance (RthJA) of 90 °C/W and a junction-to-mount thermal resistance (RthJM) of 4.0 °C/W, per JEDEC 51-2A and 51-14 test methods. These values assume mounting on an FR4 PCB with standard 2 oz. copper footprint and direct thermal pad connection, enabling accurate thermal modeling for high-reliability power rail protection layouts.
How does the SMC5K33CA-M3/I compare to the SMC5K33CAHM3/I variant?
The SMC5K33CA-M3/I and SMC5K33CAHM3/I share identical electrical characteristics and packaging, but the HM3 suffix denotes AEC-Q101 qualification explicitly in the part number, whereas M3 indicates industrial-grade qualification. Both meet AEC-Q101, but HM3-marked units undergo additional traceability and lot-level documentation per automotive requirements - the SMC5K33CA-M3/I remains fully qualified and widely used in automotive designs where HM3 labeling is not contractually mandated.
SMC5K33CA-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):
- 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/I FAQ
1.How can I place an order for SMC5K33CA-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K33CA-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 SMC5K33CA-M3/I reliable?
The price and inventory of SMC5K33CA-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 SMC5K33CA-M3/I is usually 5 days.
3.What payment methods are accepted for SMC5K33CA-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K33CA-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K33CA-M3/I?
SMC5K33CA-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K33CA-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 SMC5K33CA-M3/I?
For technical support, including SMC5K33CA-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K33CA-M3/I requirements.
6.How does Aetrix verify that SMC5K33CA-M3/I is sourced from the original manufacturer or authorized distributors?
All SMC5K33CA-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 SMC5K33CA-M3/I meets industry standards.
7.What is the process for return or replacement of SMC5K33CA-M3/I?
All SMC5K33CA-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K33CA-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 SMC5K33CA-M3/I part is unused and in its original packaging.
Return procedure for SMC5K33CA-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K33CA-M3/I Tags
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Diodes Incorporated
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