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Vishay General Semiconductor - Diodes Division SMBJ12D-M3/I
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- Part No.:
- SMBJ12D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12D-M3/I.pdf
- Description:
- TVS DIODE 12VWM 19.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,364
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Product details
Overview
SMBJ12D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power and signal lines. It features a 12 V stand-off voltage (VWM), 13.5–14.5 V breakdown voltage (VBR) at 1 mA, 19.6 V maximum clamping voltage (VC) at 30.6 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBJ12D-M3/I datasheet, SMBJ12D-M3/I pinout, SMBJ12D-M3/I application, or SMBJ12D-M3/I equivalent, this page delivers verified electrical parameters, package dimensions, real-world protection use cases, and validated alternative parts for circuit-level ESD and surge resilience design in industrial and telecom systems.
Technical Context
The SMBJ12D-M3/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (13.5–14.5 V). Its low incremental surge resistance and fast response time enable effective suppression of sub-microsecond transients induced by inductive load switching or lightning surges.
It is rated for 600 W peak pulse power (10/1000 μs), 1.0 W steady-state power dissipation at 25 °C ambient, and junction temperature operation from –55 °C to +150 °C. The device meets MSL level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and qualified per JESD 201 class 2 whisker test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V rail protection. |
| VBR (min/max) | 13.5 V / 14.5 V - Breakdown occurs within this tight ±3.5 % tolerance band at 1 mA test current; ensures predictable clamping onset. |
| VC @ IPPM | 19.6 V - Clamped voltage across device at 30.6 A peak surge current; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 μs waveform; supports robust IEC 61000-4-5 Level 4 surge immunity. |
| ID @ VWM | 2.0 μA - Reverse leakage at 12 V stand-off; negligible loading on protected 12 V supply or signal line. |
| RθJA | 125 °C/W - Junction-to-ambient thermal resistance on minimum recommended PCB pad; informs derating for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional TVS configuration; enables clamping when cathode-side voltage exceeds VBR. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or signal); conducts avalanche current to ground during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise clamping threshold alignment with 12 V system rails without oversizing margin, reducing risk of false triggering or inadequate protection. |
| 600 W peak pulse power (10/1000 μs) | Supports compliance with IEC 61000-4-5 surge immunity requirements up to 4 kV (line-earth) in properly laid-out PCBs. |
| Low 2.0 μA leakage at 12 V | Minimizes standby current draw and avoids interference with high-impedance sensor or communication lines. |
| MSL Level 1, 260 °C reflow compatible | Allows single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
Applications
| Industrial Motor Control Inputs | Automotive Body Control Module (BCM) Power Rails |
|---|---|
Use Scenario: Protection of microcontroller GPIOs and analog inputs against back-EMF spikes from relay coils and solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input trace and ground, clamping transients <100 ns after onset to limit voltage to ≤19.6 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V logic interfaces while maintaining <2 μA leakage under normal 12 V supply conditions. | Use Scenario: Surge suppression on 12 V battery-fed power rails supplying CAN transceivers and LIN bus controllers in BCM units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT distribution net, activated within nanoseconds during load-dump or jump-start events. Use Value: Limits rail excursion to 19.6 V during 30.6 A surge, preserving functionality of automotive-grade MCUs rated for 20 V absolute maximum. |
| Telecom Ethernet PHY Power Supplies | Consumer Appliance Display Backlight Drivers |
Use Scenario: Input protection for isolated DC/DC converters powering 10/100BASE-TX PHYs exposed to induced surges on PoE-enabled ports. IC Role / Device Role / Timing Role: First-line transient suppressor on secondary-side 3.3 V or 5 V bias rails, placed upstream of LDO regulators. Use Value: Absorbs 600 W pulses without degradation, ensuring stable PHY operation during field-deployed lightning-induced coupling events. | Use Scenario: Protection of boost converter outputs driving LED strings in smart refrigerators or washing machine displays. IC Role / Device Role / Timing Role: Clamp on high-side switch node to suppress inductive kickback from current-regulating MOSFETs during PWM dimming. Use Value: Withstands repetitive 30.6 A surges at 0.01 % duty cycle, extending backlight driver lifetime in high-humidity appliance environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A-M3/I | Same VWM (12 V), identical SMB package, but ±5 % VBR tolerance (12.6–13.8 V) vs. ±3.5 % for SMBJ12D-M3/I. | Lower clamping precision; suitable where tighter VBR control is not required for system margin. | Select SMBJ12A-M3/I only if cost sensitivity outweighs need for guaranteed 13.5 V minimum breakdown onset. |
| P6SMB12CA | Bidirectional variant with same VWM (12 V), symmetric clamping in both polarities; VC = 19.9 V at 29.7 A. | Required for AC-coupled or floating signal lines subject to bipolar transients (e.g., RS-485, USB D+/D−). | Choose P6SMB12CA only when bidirectional protection is mandated; SMBJ12D-M3/I is not interchangeable due to polarity and pinout differences. |
Compared with SMBJ12A-M3/I, the SMBJ12D-M3/I offers tighter VBR tolerance for more deterministic clamping onset, while P6SMB12CA provides symmetrical protection unsuitable for unidirectional DC rail use-making SMBJ12D-M3/I the optimal choice for 12 V supply line protection where polarity is fixed and precision matters.
Availability
SMBJ12D-M3/I is available at Aetrix Electronics and suitable for industrial motor control inputs, automotive body control module power rails, and telecom Ethernet PHY power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ12D-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q200 qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure applications where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of SMBJ12D-M3/I and how does it protect downstream components?
The SMBJ12D-M3/I has a maximum clamping voltage (VC) of 19.6 V at 30.6 A peak pulse current (10/1000 μs). This means that during a surge event, the device limits the voltage seen by downstream components-such as MCUs or transceivers-to no more than 19.6 V, well below typical 20 V absolute maximum ratings. Its low incremental resistance ensures rapid energy diversion to ground, preventing overvoltage damage without affecting normal 12 V operation.
Is SMBJ12D-M3/I unidirectional or bidirectional, and how is polarity identified?
SMBJ12D-M3/I is a unidirectional TVS diode. Polarity is marked by a cathode band on one end of the SMB (DO-214AA) package; the banded end connects to the protected line (e.g., 12 V rail), while the anode connects to ground. Bidirectional variants use the "CD" suffix (e.g., SMBJ12CD-M3/I) and lack a cathode band. Using SMBJ12D-M3/I in place of a bidirectional part will fail to suppress positive transients on grounded lines.
What is the meaning of the "-M3/I" suffix in SMBJ12D-M3/I?
The "-M3" suffix denotes Vishay's industrial-grade, halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 class 2 whisker resistance. The "/I" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3200 units-optimized for high-volume SMT assembly. This differs from "/H", which uses 7-inch reels of 750 units.
Can SMBJ12D-M3/I be used for IEC 61000-4-5 surge protection, and what layout considerations apply?
Yes, SMBJ12D-M3/I supports IEC 61000-4-5 Level 4 (4 kV line-earth) when applied with proper PCB layout: short, wide traces to ground plane; minimum recommended 5.0 mm × 5.0 mm copper pad area per terminal; and placement directly at the entry point of the protected line. Its 600 W rating and 19.6 V clamping enable compliance, but effectiveness depends on low-inductance grounding-long traces or vias degrade performance significantly.
How does SMBJ12D-M3/I compare to SMAJ12A in terms of power handling and thermal performance?
SMBJ12D-M3/I delivers 600 W peak pulse power (10/1000 μs) versus SMAJ12A's 400 W, due to its larger SMB package vs. SMA. Its RθJA is 125 °C/W on minimum pad layout-lower than SMAJ12A's ~150 °C/W-enabling better thermal dissipation during repetitive surges. For high-energy industrial surges, SMBJ12D-M3/I provides superior robustness and longer service life than SMAJ12A.
SMBJ12D-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.5V
- Voltage - Clamping (Max) @ Ipp:
- 19.6V
- Current - Peak Pulse (10/1000µs):
- 30.6A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ12D-M3/I FAQ
1.How can I place an order for SMBJ12D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12D-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 SMBJ12D-M3/I reliable?
The price and inventory of SMBJ12D-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 SMBJ12D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ12D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12D-M3/I?
SMBJ12D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12D-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 SMBJ12D-M3/I?
For technical support, including SMBJ12D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12D-M3/I requirements.
6.How does Aetrix verify that SMBJ12D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12D-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 SMBJ12D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ12D-M3/I?
All SMBJ12D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12D-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 SMBJ12D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ12D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12D-M3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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