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Vishay General Semiconductor - Diodes Division SMBG12A-M3/5B
- Part No.:
- SMBG12A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG12A-M3/5B.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,435
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Product details
Overview
SMBG12A-M3/5B 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 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 30.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O ports, and DC power rail protection.
For engineers reviewing the SMBG12A-M3/5B datasheet, SMBG12A-M3/5B pinout, SMBG12A-M3/5B application, or SMBG12A-M3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating when reverse voltage exceeds VBR to divert surge energy away from downstream components. Its glass-passivated junction ensures stable leakage performance (<5.0 μA at VWM) and fast response time (<1 ns), critical for suppressing ESD and inductive switching transients.
The SMBG12A-M3/5B is rated for 100 A non-repetitive forward surge current (8.3 ms half-sine), exhibits 20 °C/W junction-to-lead thermal resistance, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak - enabling reliable integration into high-volume automotive and industrial PCB assemblies without derating concerns below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - precise breakdown threshold ensuring predictable turn-on behavior |
| VC @ IPPM | 19.9 V at 30.2 A - low clamping voltage limits stress on protected ICs during 600 W surges |
| PPPM | 600 W - peak pulse power handling capability with 10/1000 μs waveform, 0.01% duty cycle |
| IFSM | 100 A - surge current withstand for 8.3 ms half-sine, supporting motor driver and relay coil suppression |
| TJ max | +150 °C - extended junction temperature range enables under-hood automotive use |
| Package | SMBG (DO-215AA) - surface-mount outline with 0.235" × 0.130" footprint and gull-wing leads |
Pinout & Package
Package: SMBG (DO-215AA), halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on unidirectional device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line; band-marked end accepts transient voltage above VWM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| 600 W peak pulse power | Robust suppression of ISO 7637-2 pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges without degradation |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Glass passivated junction | Ensures stable VBR tolerance and <5.0 μA leakage at VWM, critical for low-power sensor interfaces |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and chassis ground, activated within nanoseconds upon overvoltage detection. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to 12 V-rated interface ICs while maintaining signal integrity during normal operation. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing 600 W surges on 24 V DC input channels, coordinated with upstream fusing. Use Value: Enables >100,000 surge cycles without parameter shift, reducing field failure rates in factory automation environments. |
| DC Power Rail Protection | Consumer Device USB Port Protection |
Use Scenario: Clamping voltage spikes on 12 V supply rails feeding microcontrollers and motor drivers in embedded systems. IC Role / Device Role / Timing Role: Low-leakage (≤5.0 μA) unidirectional TVS placed at power entry point, referenced to system ground. Use Value: Maintains <1% standby current impact while delivering 19.9 V clamping to preserve 12 V regulator headroom and prevent brownout resets. | Use Scenario: Secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs and portable audio devices. IC Role / Device Role / Timing Role: Fast-response (sub-ns) clamping element added downstream of primary TVS or integrated ESD array. Use Value: Complements system-level ESD design by limiting residual transients to <20 V, meeting IEC 61000-4-2 Level 4 (±15 kV contact) requirements. |
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-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Not qualified to AEC-Q101; unsuitable for automotive under-hood use | Select SMBG12A-M3/5B when halogen-free and automotive qualification are required |
| SMBJ12A-M3/5B | Higher 600 W rating same, but SMBJ package (DO-214AB) has larger footprint and 125 °C TJ max | Lower thermal resistance (RθJA = 40 °C/W vs. 100 °C/W) supports higher ambient temps | Choose SMBG12A-M3/5B for space-constrained layouts where SMBG's smaller DO-215AA footprint is critical |
Compared with SMBG12A-E3/5B and SMBJ12A-M3/5B, the SMBG12A-M3/5B uniquely combines AEC-Q101 qualification, halogen-free construction, and the compact SMBG package - making it optimal for automotive and high-density industrial designs requiring both reliability and board space efficiency.
Availability
SMBG12A-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and DC power rail protection requiring stable component supply across production lifecycles.
Supply support for SMBG12A-M3/5B 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 reliability, precision, and automotive-grade validation.
The SMBG series was engineered specifically for high-reliability surface-mount transient suppression in space-constrained automotive and industrial applications, balancing low clamping voltage, fast response, and robust surge handling in the DO-215AA outline.
FAQ
What is the clamping voltage of SMBG12A-M3/5B at its rated peak pulse current?
The SMBG12A-M3/5B has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures protected circuits experience minimal overvoltage stress during surge events. The SMBG12A-M3/5B maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBG12A-M3/5B suitable for automotive applications?
Yes, SMBG12A-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 150 °C maximum junction temperature, halogen-free construction (M3 suffix), and validation across temperature cycling, HTRB, and ESD tests confirm suitability for engine control units, body electronics, and ADAS sensor interfaces. The SMBG12A-M3/5B meets ISO 7637-2 and ISO 16750-2 requirements when applied per Vishay's recommended layout guidelines.
How does the SMBG12A-M3/5B differ from the SMBG12CA-M3/5B?
The SMBG12A-M3/5B is unidirectional, while SMBG12CA-M3/5B is bidirectional - meaning the latter clamps in both polarities and lacks polarity marking. Electrically, SMBG12CA-M3/5B has identical VWM (12 V), VBR (13.3–14.7 V), and VC (19.9 V) ratings but is intended for AC-coupled or floating signal lines like RS-485 or Ethernet PHYs. The SMBG12A-M3/5B must be oriented with cathode toward the protected line, whereas SMBG12CA-M3/5B has no orientation requirement.
What is the thermal resistance of SMBG12A-M3/5B, and how does it affect PCB layout?
The SMBG12A-M3/5B 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. Its junction-to-lead resistance (RθJL) is 20 °C/W, indicating efficient heat transfer to PCB traces. To maintain reliability under repetitive surges, designers should use minimum recommended pad layout and avoid excessive trace length between the SMBG12A-M3/5B and ground plane.
Does SMBG12A-M3/5B require derating at elevated ambient temperatures?
Yes, SMBG12A-M3/5B requires derating above 25 °C ambient per Figure 2 in the Vishay datasheet (Doc. #88456). At 85 °C ambient, its peak pulse power rating drops to approximately 420 W (70% of 600 W), and at 125 °C, it falls to ~240 W (40%). Derating ensures safe operation within the 150 °C maximum junction temperature limit. The SMBG12A-M3/5B's thermal characteristics are validated for continuous operation up to 125 °C ambient when used within these derated limits.
SMBG12A-M3/5B 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-M3/5B FAQ
1.How can I place an order for SMBG12A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG12A-M3/5B 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-M3/5B reliable?
The price and inventory of SMBG12A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG12A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG12A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG12A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG12A-M3/5B?
SMBG12A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG12A-M3/5B 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-M3/5B?
For technical support, including SMBG12A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG12A-M3/5B requirements.
6.How does Aetrix verify that SMBG12A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG12A-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG12A-M3/5B?
All SMBG12A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG12A-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBG12A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG12A-M3/5B Tags
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