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Vishay General Semiconductor - Diodes Division SMCG33A-M3/9AT
- Part No.:
- SMCG33A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG33A-M3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,705
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Product details
Overview
SMCG33A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for high-energy surge protection with a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), and 1500 W peak pulse power (PPPM). It clamps transients to 53.3 V at 28.1 A (10/1000 µs waveform) and is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive-grade reliability.
For engineers reviewing the SMCG33A-M3/9AT datasheet, SMCG33A-M3/9AT pinout, SMCG33A-M3/9AT application, or SMCG33A-M3/9AT equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines where fast response (<1 ns), low clamping voltage, and stable performance across -55 °C to +150 °C are required.
Technical Context
The SMCG33A-M3/9AT uses an avalanche breakdown mechanism in a glass-passivated silicon junction to deliver sub-nanosecond response to ESD and lightning-induced surges. Its unidirectional polarity enables integration into DC-biased circuits without reverse conduction during normal operation.
It operates within a 33 V stand-off range, clamps at 53.3 V under 28.1 A peak pulse current (10/1000 µs), and maintains thermal stability via low RθJA (75 °C/W) and RθJL (15 °C/W), enabling reliable operation on standard 8.0 mm × 8.0 mm copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 33 V systems. |
| VBR min/max | 36.7 V / 40.6 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 53.3 V - Clamping voltage at 28.1 A peak pulse; limits downstream IC stress during surge events. |
| PPPM | 1500 W - Peak pulse power handling (10/1000 µs); supports IEC 61000-4-5 Level 4 (4 kV) surge immunity. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard PCB pad; informs heatsinking requirements. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing leaded case with matte tin-plated terminals, UL 94 V-0 molding compound, MSL Level 1 (260 °C reflow peak), and AEC-Q101 qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side of protected circuit (e.g., ground or return path). |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to higher-potential side (e.g., 33 V rail); defines unidirectional blocking direction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability and low leakage (<1 µA at VWM) across temperature and humidity stress. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units and ADAS sensor interfaces. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets environmental compliance mandates for industrial and consumer electronics manufacturing. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin for sensitive ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 33 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp surges above 33 V. Use Value: Limits rail voltage to ≤53.3 V during 28.1 A surges, preventing damage to microcontrollers and CAN transceivers. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: TVS connected between sensor output line and ground to absorb ±8 kV HBM ESD pulses. Use Value: Sub-ns response and <1 µA leakage preserve signal integrity and measurement accuracy in 12-bit ADC systems. |
| DC Motor Driver Gate Protection | Telecom Power Supply Input Stage |
Use Scenario: Safeguarding N-channel MOSFET gates driven by 33 V logic in brushed DC motor controllers. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp Miller-induced voltage spikes during switching. Use Value: 53.3 V clamping prevents gate oxide breakdown while maintaining fast switching speed due to low capacitance. | Use Scenario: Front-end surge suppression on 33 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS in series with fuse and MOV on DC input bus before DC/DC converter. Use Value: 1500 W PPPM rating handles repeated 10/1000 µs surges per IEC 61000-4-5, extending system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-M3/57T | Same VWM/VBR/VC specs but SMA (DO-214AC) package; 600 W PPPM vs. 1500 W. | Limited to lower-energy surges; unsuitable for IEC 61000-4-5 Level 4. | Select only when board space is constrained and surge threat level is ≤1 kV. |
| SMCJ33A-M3/9AT | Same SMCG package, 1500 W PPPM, but 36.7–40.6 V VBR and 53.3 V VC - identical electrical specs. | No functional difference; SMCJ33A-M3/9AT is same device under alternate naming convention per Vishay documentation. | Verify part marking and reel code; functionally interchangeable with no design change required. |
Compared with SMCG33A-M3/9AT, SMAJ33A-M3/57T offers smaller footprint but sacrifices 60% pulse power handling, while SMCJ33A-M3/9AT is electrically and mechanically identical-enabling drop-in sourcing flexibility without layout or validation impact.
Availability
SMCG33A-M3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input stage surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCG33A-M3/9AT 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCG series was developed specifically for high-power, surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom applications demanding AEC-Q101 compliance and 1500 W surge capability.
FAQ
What is the maximum clamping voltage of the SMCG33A-M3/9AT under standard surge conditions?
The SMCG33A-M3/9AT clamps to 53.3 V at 28.1 A peak pulse current using the industry-standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and verified on the recommended 8.0 mm × 8.0 mm copper pad layout. The clamping voltage directly determines the maximum stress imposed on downstream components during surge events, making it a critical parameter for system-level protection design using the SMCG33A-M3/9AT.
Is the SMCG33A-M3/9AT suitable for automotive applications?
Yes, the SMCG33A-M3/9AT is AEC-Q101 qualified and carries the HM3 suffix designation in Vishay's ordering matrix, confirming its suitability for automotive applications. It meets stringent requirements for temperature cycling, humidity, and mechanical shock. Its 1500 W surge rating and -55 °C to +150 °C operating range make it appropriate for engine control units, body electronics, and ADAS sensor modules where the SMCG33A-M3/9AT provides certified overvoltage protection.
What does the "M3" suffix indicate in SMCG33A-M3/9AT?
The "M3" suffix in SMCG33A-M3/9AT denotes halogen-free, RoHS-compliant construction with industrial-grade reliability and JESD 201 Class 2 whisker resistance. It distinguishes the part from "E3" (RoHS-compliant but not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free). For SMCG33A-M3/9AT, M3 confirms environmental compliance and process robustness, though full AEC-Q101 qualification requires verification of the specific reel lot's certification status.
How does the SMCG33A-M3/9AT compare to bidirectional TVS diodes like SMCG33CA?
The SMCG33A-M3/9AT is unidirectional and blocks reverse current above 33 V, while SMCG33CA is bidirectional with symmetrical clamping in both directions. The SMCG33A-M3/9AT exhibits lower leakage (<1 µA at VWM) and is intended for DC-biased rails; SMCG33CA suits AC-coupled or floating signal lines. Both share identical PPPM (1500 W) and package (SMCG), but their polarity dictates placement strategy-making SMCG33A-M3/9AT optimal for 33 V power rail protection where polarity is fixed.
What is the thermal resistance of the SMCG33A-M3/9AT, and how does it affect PCB layout?
The SMCG33A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no additional heatsinking. To maintain TJ ≤ 150 °C at full 6.5 W steady-state dissipation, designers must ensure adequate copper area and airflow-or limit duty cycle. Layout deviations from the specified pad size will directly degrade thermal performance, impacting long-term reliability of the SMCG33A-M3/9AT in sustained surge environments.
SMCG33A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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 (SMCG)
SMCG33A-M3/9AT FAQ
1.How can I place an order for SMCG33A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG33A-M3/9AT 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 SMCG33A-M3/9AT reliable?
The price and inventory of SMCG33A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG33A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG33A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG33A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG33A-M3/9AT?
SMCG33A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG33A-M3/9AT 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 SMCG33A-M3/9AT?
For technical support, including SMCG33A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG33A-M3/9AT requirements.
6.How does Aetrix verify that SMCG33A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG33A-M3/9AT 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 SMCG33A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG33A-M3/9AT?
All SMCG33A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG33A-M3/9AT, 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 SMCG33A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG33A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG33A-M3/9AT Tags
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