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Vishay General Semiconductor - Diodes Division SMBG12A-M3/52
- Part No.:
- SMBG12A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG12A-M3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
SMBG12A-M3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V maximum clamping voltage (VC) at 30.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBG12A-M3/52 datasheet, SMBG12A-M3/52 pinout, SMBG12A-M3/52 application, or SMBG12A-M3/52 equivalent, this device is selected for automotive-level surge immunity, I/O line protection in industrial controllers, and DC rail clamping in power supply front-ends where AEC-Q101 qualification, low clamping ratio, and halogen-free compliance are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 12 V), then rapidly avalanches below 15 V to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The SMBG12A-M3/52 is rated for -55 °C to +150 °C operating junction temperature, exhibits 100 °C/W junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm copper pads, and meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow requirements up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin for 12 V DC rails. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Tight breakdown window ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamps transients to ≤1.66×VWM, protecting 15 V-tolerant ICs and MOSFET gates. |
| PPPM | 600 W - Sustains 10/1000 μs surges per IEC 61000-4-5 Level 4 without degradation. |
| IFSM | 100 A - Withstands 8.3 ms half-sine surge events common in automotive load-dump scenarios. |
| TJ max | +150 °C - Enables deployment in under-hood automotive modules and industrial power converters. |
| Package | SMBG (DO-215AA) - Surface-mount footprint compatible with automated assembly; 0.235" × 0.255" body size. |
Pinout & Package
Package: SMBG (DO-215AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point; completes clamping path during positive transients. |
| Cathode | Protected line input | Connected to signal/power line being protected; avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1 requirements for green manufacturing and end-of-life handling. |
| 600 W peak pulse power (10/1000 μs) | Handles repeated ISO 7637-2 Pulse 5a/b load-dump transients without parameter shift or failure. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for high-speed interfaces. |
| MSL Level 1 (260 °C peak) | Supports single-reflow soldering without moisture-induced popcorn cracking or delamination. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between battery rail and regulator input. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤19.9 V, preventing latch-up or gate oxide rupture. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules. IC Role / Device Role / Timing Role: Point-of-entry TVS on twisted-pair signal lines exposed to EFT and surge coupling. Use Value: Clamps induced spikes within 1 ns while maintaining <1 μA leakage at 12 V, preserving signal integrity and ADC accuracy. |
| DC-DC Converter Input Stage | USB-C Power Delivery Line |
Use Scenario: Front-end protection for 12 V input buck converters in telecom power supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input capacitor and controller IC. Use Value: Absorbs 600 W surge energy without derating, enabling compact design with minimal heatsinking. |
Use Scenario: VBUS line protection in USB-C PD adapters supporting 20 V PPS profiles. IC Role / Device Role / Timing Role: Secondary clamping device after primary MOV, targeting fast transient suppression. Use Value: Achieves 19.9 V clamping at 30.2 A-well below 21 V absolute maximum rating of PD controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG12A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable for industrial non-automotive use where halogen content is unrestricted. | Select SMBG12A-E3/52 when halogen-free requirement is waived and cost optimization is prioritized. |
| SMBG12AHM3/52 | Identical electrical specs plus AEC-Q101 qualification (HM3 suffix denotes halogen-free + automotive grade). | Required for safety-critical automotive subsystems (e.g., ADAS camera power rails). | Choose SMBG12AHM3/52 when full AEC-Q101 compliance is mandated and system-level qualification evidence is needed. |
Compared with SMBG12A-M3/52, SMBG12A-E3/52 offers identical surge performance without halogen-free assurance, while SMBG12AHM3/52 adds formal automotive qualification-making the M3 variant the optimal balance of green compliance and broad industrial applicability without over-specifying for non-automotive use cases.
Availability
SMBG12A-M3/52 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and 12 V DC-DC converter designs requiring stable component supply, halogen-free materials, and AEC-Q101-aligned reliability.
Supply support for SMBG12A-M3/52 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-efficiency, and automotive-qualified solutions.
The SMBG series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments-including automotive power distribution, industrial automation, and telecom infrastructure-where consistent clamping, low leakage, and process compatibility are critical.
FAQ
What is the clamping voltage of SMBG12A-M3/52 and how does it protect downstream components?
The SMBG12A-M3/52 has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current (10/1000 μs). This means that during a surge event, the device limits the voltage across protected circuitry to no more than 19.9 V, well below typical 24 V-tolerant IC thresholds. Its fast avalanche response ensures protection begins within nanoseconds, preventing damage to sensitive inputs like microcontroller GPIOs or power management ICs. The SMBG12A-M3/52 achieves this while maintaining only 5 μA max reverse leakage at 12 V.
Is SMBG12A-M3/52 suitable for automotive applications?
Yes, SMBG12A-M3/52 is AEC-Q101 qualified and rated for operation from -55 °C to +150 °C junction temperature, making it suitable for under-hood and cabin automotive applications. It withstands 100 A peak forward surge current (8.3 ms half-sine), matching ISO 7637-2 Pulse 5a/b load-dump requirements. The M3 suffix confirms halogen-free construction per automotive material standards. While not HM3-grade, its qualification covers most non-safety-critical automotive subsystems. The SMBG12A-M3/52 is widely deployed in body control modules and lighting drivers.
How does the M3 suffix differ from E3 or HM3 in SMBG12A-M3/52?
The M3 suffix in SMBG12A-M3/52 indicates halogen-free, RoHS-compliant, and industrial-grade construction-meeting JEDEC J-STD-609A Class 1 and IEC 61249-2-21. In contrast, E3 is RoHS-compliant but not halogen-free, while HM3 adds formal AEC-Q101 qualification atop halogen-free compliance. All three share identical electrical parameters and SMBG package dimensions. The SMBG12A-M3/52 thus provides green compliance without automotive certification overhead, ideal for industrial and consumer applications where halogen restrictions apply but AEC-Q101 is not mandated.
What is the thermal resistance of SMBG12A-M3/52 and how does it affect PCB layout?
SMBG12A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet Figure 5. To maintain safe junction temperatures during repetitive surges, designers must provide adequate copper area and avoid excessive trace length between the SMBG12A-M3/52 and ground planes. For high-duty-cycle applications, adding thermal vias under pads reduces effective RθJA. The SMBG12A-M3/52's 150 °C max TJ allows operation in ambient temperatures up to 85 °C with proper layout.
Can SMBG12A-M3/52 be used in bidirectional configurations?
No, SMBG12A-M3/52 is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMBG12CA). Using SMBG12A-M3/52 in reverse-biased AC applications would result in forward conduction and potential failure during negative half-cycles. For bidirectional protection at 12 V standoff, SMBG12CA-M3/52 is the correct variant-offering symmetric breakdown in both directions with same VBR and VC ratings. The SMBG12A-M3/52 must be oriented with cathode toward the protected line and anode to ground.
SMBG12A-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 30.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG12A-M3/52 FAQ
1.How can I place an order for SMBG12A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG12A-M3/52 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 SMBG12A-M3/52 reliable?
The price and inventory of SMBG12A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG12A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBG12A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG12A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG12A-M3/52?
SMBG12A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG12A-M3/52 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 SMBG12A-M3/52?
For technical support, including SMBG12A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG12A-M3/52 requirements.
6.How does Aetrix verify that SMBG12A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG12A-M3/52 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 SMBG12A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBG12A-M3/52?
All SMBG12A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG12A-M3/52, 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 SMBG12A-M3/52 part is unused and in its original packaging.
Return procedure for SMBG12A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG12A-M3/52 Tags
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