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Vishay General Semiconductor - Diodes Division SMCG33CA-M3/9AT
- Part No.:
- SMCG33CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG33CA-M3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,961
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Product details
Overview
SMCG33CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), clamping voltage of 53.3 V at 28.1 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCG33CA-M3/9AT datasheet, SMCG33CA-M3/9AT pinout, SMCG33CA-M3/9AT application, or SMCG33CA-M3/9AT equivalent, this device is selected for high-energy surge suppression in automotive sensor interfaces, industrial I/O lines, and telecom signal conditioning where bidirectional clamping, low incremental surge resistance, and halogen-free RoHS compliance are required.
Technical Context
The SMCG33CA-M3/9AT operates as a bidirectional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling protection against voltage transients regardless of polarity. Its glass-passivated junction ensures stable VBR (36.7–40.6 V) and low leakage (<1.0 μA at VWM), while the DO-215AB package provides thermal resistance of 75 °C/W (junction-to-ambient) and supports automated SMT placement.
Designed for 10/1000 μs waveform surges, it delivers 28.1 A peak pulse current (IPPM) with a clamping voltage of 53.3 V - critical for maintaining safe operating margins across ICs, MOSFETs, and sensor front-ends. Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse stand-off voltage before clamping begins; defines safe operating range for protected circuitry |
| VBR min/max | 36.7 V / 40.6 V - guaranteed breakdown voltage range at 1 mA test current; ensures consistent turn-on threshold |
| VC @ IPPM | 53.3 V - clamped voltage at 28.1 A peak pulse current; determines maximum stress on downstream components |
| PPPM | 1500 W - peak pulse power handling per 10/1000 μs waveform; enables robust lightning and ESD surge immunity |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage at rated stand-off voltage; minimizes standby power loss and signal distortion |
| TJ max | +150 °C - maximum junction temperature rating; supports operation in under-hood automotive and industrial environments |
| Package | SMCG (DO-215AB) - surface-mount gull-wing package with 8.0 mm × 8.0 mm copper pad footprint; optimized for thermal dissipation and automated assembly |
Pinout & Package
SMCG33CA-M3/9AT uses the SMCG (DO-215AB) surface-mount package - a gull-wing leaded case with two terminals, no polarity marking for bidirectional operation. The package meets UL 94 V-0 flammability rating and is qualified to MSL level 1 (peak reflow ≤ 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; symmetric conduction enables polarity-agnostic protection |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; no marking required; requires no orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces requiring zero-failure reliability |
| Glass passivated junction | Ensures stable electrical parameters over time and temperature; prevents parameter drift due to moisture or contamination |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for global automotive and industrial markets without compromising thermal or electrical performance |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients; improves clamping accuracy for precision analog and digital circuits |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak - eliminates baking requirements and simplifies manufacturing |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: With 53.3 V clamping at 28.1 A and AEC-Q101 qualification, SMCG33CA-M3/9AT maintains signal integrity while surviving repeated 12 V system transients up to ±1500 W. | Use Scenario: Safeguarding PLC analog input modules and digital fieldbus nodes (e.g., RS-485, Profibus) against induced surges from motor switching and lightning coupling. IC Role / Device Role / Timing Role: Primary line-level transient suppressor mounted adjacent to interface connectors to limit voltage excursion on protected data lines. Use Value: 33 V VWM aligns with 24 V industrial supply rails; 1500 W PPPM handles multi-kA surge events without degradation, ensuring long-term BOM stability. |
| Telecom Signal Line Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding Ethernet PHYs, DSL line drivers, and baseband modems from ESD and fast-rising transients on unshielded twisted-pair cabling. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp on differential pairs or single-ended signal paths to prevent latch-up or gate oxide damage. Use Value: Sub-1 ns response time and 53.3 V VC ensure signal lines remain within safe SOA limits even during 8 kV contact ESD events per IEC 61000-4-2. | Use Scenario: Secondary-side overvoltage protection in AC/DC adapters and USB PD chargers, guarding DC output rails against feedback faults and regulator failure. IC Role / Device Role / Timing Role: Standby-mode protector across regulated 5–20 V outputs to absorb fault-induced voltage spikes before they reach connected devices. Use Value: 33 V VWM provides margin above common 20 V PD profiles; halogen-free M3 construction satisfies consumer safety and sustainability mandates. |
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-E3/57T | Same VWM (33 V), lower PPPM (400 W), SMA (DO-214AC) package, non-AEC-Q101 | Lower surge rating suits cost-sensitive consumer electronics; not qualified for automotive under-hood use | Select when 400 W surge capacity suffices and AEC-Q101 is not required; smaller footprint but higher thermal resistance |
| SMCJ33CA-M3 | Same VWM (33 V), higher PPPM (1500 W), identical DO-215AB package, but no /9AT reel packaging option confirmed | Functionally identical surge capability and automotive qualification; differs only in packaging configuration and reel size | Choose if tape-and-reel quantity or delivery mode differs; verify reel code compatibility with SMT line feeders |
Compared with SMAJ33CA-E3/57T and SMCJ33CA-M3, SMCG33CA-M3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge rating, halogen-free construction, and 3500-unit 13″ reel packaging - making it optimal for high-volume automotive production with strict environmental and logistics requirements.
Availability
SMCG33CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and telecom signal line hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCG33CA-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 application-specific optimization.
The SMCG series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive and industrial systems demanding AEC-Q101 compliance and halogen-free materials.
FAQ
What is the breakdown voltage range for SMCG33CA-M3/9AT?
The SMCG33CA-M3/9AT has a guaranteed breakdown voltage (VBR) range of 36.7 V to 40.6 V at 1 mA test current, measured in both directions due to its bidirectional design. This range ensures reliable and repeatable clamping onset across production lots and temperature extremes, directly supporting robust overvoltage protection in automotive and industrial applications where precise threshold control is essential.
Is SMCG33CA-M3/9AT suitable for automotive under-hood applications?
Yes, SMCG33CA-M3/9AT is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C junction temperature, making it suitable for under-hood automotive applications such as engine control units, transmission sensors, and ADAS camera modules. Its halogen-free M3 construction and DO-215AB package with MSL Level 1 reflow compatibility further support stringent automotive manufacturing and reliability requirements.
What does the "CA" suffix indicate in SMCG33CA-M3/9AT?
The "CA" suffix in SMCG33CA-M3/9AT denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression in both polarities, with identical electrical characteristics (VBR, VC, IPPM) regardless of voltage polarity. This eliminates the need for polarity-aware layout and simplifies protection design for AC-coupled or differential signal paths.
How does the SMCG33CA-M3/9AT differ from unidirectional variants like SMCG33A-M3/9AT?
Unlike unidirectional SMCG33A-M3/9AT, the SMCG33CA-M3/9AT lacks a cathode band marking and exhibits matched breakdown and clamping behavior in both directions. Unidirectional versions include polarity-sensitive forward conduction (VF = 3.5 V at 100 A) and require correct orientation; SMCG33CA-M3/9AT avoids layout errors and supports AC or floating-line protection without directional constraints.
What is the thermal resistance of SMCG33CA-M3/9AT, and how does it impact PCB layout?
SMCG33CA-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 guides minimum pad sizing and copper area allocation: undersized pads increase junction temperature during surge events, potentially degrading clamping performance or lifetime. For sustained power dissipation, thermal vias and internal ground planes are recommended to augment heat spreading.
SMCG33CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCG33CA-M3/9AT FAQ
1.How can I place an order for SMCG33CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG33CA-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 SMCG33CA-M3/9AT reliable?
The price and inventory of SMCG33CA-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 SMCG33CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG33CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG33CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG33CA-M3/9AT?
SMCG33CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG33CA-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 SMCG33CA-M3/9AT?
For technical support, including SMCG33CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG33CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG33CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG33CA-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 SMCG33CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG33CA-M3/9AT?
All SMCG33CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG33CA-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 SMCG33CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG33CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG33CA-M3/9AT Tags
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