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Vishay General Semiconductor - Diodes Division SMBJ12D-M3/H
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- Part No.:
- SMBJ12D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12D-M3/H.pdf
- Description:
- TVS DIODE 12VWM 19.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,686
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Product details
Overview
SMBJ12D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 12 V stand-off voltage (VWM), 13.5–14.5 V breakdown voltage (VBR) at 1.0 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 - deployed on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ12D-M3/H datasheet, SMBJ12D-M3/H pinout, SMBJ12D-M3/H application, or SMBJ12D-M3/H equivalent, key selection criteria include clamping performance under 30.6 A surge, thermal resistance (RθJA = 125 °C/W on minimum pad), unidirectional polarity with cathode band marking, and M3/H tape-and-reel packaging compliant with JESD 201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance standby to low-impedance conduction when reverse voltage exceeds VBR, limiting transient energy to protected downstream circuitry. Its 19.6 V VC at IPPM ensures MOSFET gate drivers and microcontroller I/O pins remain below absolute maximum ratings during ESD or inductive switching events.
The SMBJ12D-M3/H uses silicon avalanche technology with tight ±3.5 % VBR tolerance, exhibits ≤2.0 μA reverse leakage at 12 V, and maintains stable operation across -55 °C to +150 °C junction temperature range. It meets UL 497B recognition (QVGQ2) and is rated for MSL Level 1 reflow compatibility up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (Breakdown) | 13.5–14.5 V at 1.0 mA - Tight tolerance ensures predictable turn-on threshold for consistent protection timing. |
| VC (Clamping) | 19.6 V at 30.6 A - Limits transient voltage seen by protected ICs; critical for safeguarding 15–20 V logic or gate drivers. |
| PPPM | 600 W (10/1000 μs) - Sustains single high-energy surges common in motor drives and relay coils without failure. |
| ID (Leakage) | ≤2.0 μA at 12 V - Minimizes standby power loss and avoids false triggering in low-current sensor circuits. |
| RθJA | 125 °C/W (min. pad layout) - Determines thermal rise under sustained power dissipation; guides PCB copper area design. |
| Polarity | Unidirectional - Cathode band denotes terminal; enables asymmetric protection on positive-rail applications only. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected-side connection | Connected to line being protected (e.g., VCC rail); conducts surge current to ground when V > VBR. |
| Anode | Reference/ground return | Tied to system ground or low-impedance return path; completes clamping loop during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with downstream IC absolute maximum ratings without overdesigning margin. |
| 600 W peak pulse power | Handles repetitive 10/1000 μs transients at 0.01 % duty cycle - suitable for industrial motor control and PLC I/O. |
| MSL Level 1 moisture sensitivity | Allows direct placement into standard SMT reflow without baking; reduces manufacturing overhead. |
| UL 497B recognized (QVGQ2) | Validates suitability for telecom and industrial safety-critical surge protection per regulatory requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns), improving protection fidelity for high-speed interfaces. |
Applications
| Industrial Sensor Interface | Motor Drive Power Rail |
|---|---|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O of pressure/temperature sensors exposed to field wiring transients. IC Role / Device Role / Timing Role: Clamping diode placed between sensor output and MCU ADC input or isolator primary side. Use Value: Limits induced surges to ≤19.6 V, preventing latch-up or damage to 3.3 V/5 V ADC front-ends while maintaining <2 μA leakage at 12 V bias. |
Use Scenario: Safeguarding gate driver supply rails (e.g., bootstrap VDD) in 3-phase inverter modules subject to inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS connected from gate driver VDD to GND, absorbing 600 W pulses from MOSFET switching noise. Use Value: Clamps 30.6 A surges within 1 ns response time, preserving gate driver functionality and preventing false turn-on due to voltage spikes. |
| Telecom Line Card Protection | Automotive Body Control Module |
Use Scenario: Shielding Ethernet PHY power pins and RS-485 transceiver VCC against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping element on 12 V auxiliary rail feeding communication ICs in central office equipment. Use Value: UL 497B recognition and 19.6 V clamping ensure compliance with Telcordia GR-1089-CORE immunity requirements for Class B equipment. |
Use Scenario: Protecting LIN bus transceiver VBAT supply and microcontroller reset line from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed on 12 V battery feed to BCM power management ICs. Use Value: Withstands 125 °C junction temperature and delivers 600 W pulse handling - validated for ISO 7637-2 Pulse 5a compliance in automotive 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/H | Same VWM/VBR/VC specs but A-suffix indicates ±5 % VBR tolerance (vs. ±3.5 % for SMBJ12D-M3/H). | Acceptable where tighter clamping consistency is not required; lower cost for non-critical protection zones. | Select SMBJ12A-M3/H only if design allows wider VBR variation and does not require coordinated clamping with narrow-margin ICs. |
| SMCJ12A-M3/H | Same VWM (12 V) but higher PPPM (1500 W), larger SMC (DO-214AB) package, and higher RθJA (60 °C/W on min. pad). | Better suited for high-energy surge environments (e.g., AC mains input), but requires larger PCB footprint and different layout. | Choose SMCJ12A-M3/H when 600 W is insufficient and board space permits larger SMC package; not drop-in compatible. |
Compared with SMBJ12A-M3/H, the SMBJ12D-M3/H provides tighter VBR control for precision clamping; compared with SMCJ12A-M3/H, it offers smaller footprint and faster response but lower energy handling - making SMBJ12D-M3/H optimal for space-constrained, medium-energy protection on DC rails and signal lines.
Availability
SMBJ12D-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, motor drive power rails, and telecom line card protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ12D-M3/H 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 and application-specific performance.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure equipment where repeatable clamping and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMBJ12D-M3/H at its rated peak pulse current?
The SMBJ12D-M3/H has a maximum clamping voltage (VC) of 19.6 V at 30.6 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value ensures protected circuitry remains within safe operating limits during standardized surge events, and is verified per ANSI/IEEE C62.35 test conditions.
Does SMBJ12D-M3/H meet UL safety certification for surge protection applications?
Yes, SMBJ12D-M3/H is Underwriters Laboratory recognized under UL 497B (file E136766) for both unidirectional and bidirectional configurations. This certification validates its use in telecom, industrial, and building automation systems requiring third-party verified transient suppression performance.
What does the "M3/H" suffix indicate in SMBJ12D-M3/H?
The "M3" denotes halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance, while "H" specifies packaging in 7″ diameter plastic tape and reel with 750 units per reel. This configuration supports automated SMT assembly and complies with IPC/JEDEC standards for lead-free reflow.
Can SMBJ12D-M3/H be used in bidirectional protection circuits?
No - SMBJ12D-M3/H is strictly unidirectional, indicated by the "D" suffix and cathode band marking. For bidirectional operation, the SMBJ12CD-M3/H variant must be selected, which provides symmetrical clamping in both polarities and omits the cathode band.
What is the thermal resistance of SMBJ12D-M3/H under standard PCB mounting conditions?
SMBJ12D-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout per Vishay specification. This value increases if copper area is reduced and decreases with larger thermal pads or internal ground planes - critical for steady-state power derating above 25 °C ambient.
SMBJ12D-M3/H 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/H FAQ
1.How can I place an order for SMBJ12D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12D-M3/H 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/H reliable?
The price and inventory of SMBJ12D-M3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ12D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12D-M3/H?
SMBJ12D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12D-M3/H 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/H?
For technical support, including SMBJ12D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12D-M3/H requirements.
6.How does Aetrix verify that SMBJ12D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12D-M3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ12D-M3/H?
All SMBJ12D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12D-M3/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ12D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12D-M3/H Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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