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Vishay General Semiconductor - Diodes Division SMBJ12AHM3/I
- Part No.:
- SMBJ12AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHM3/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,603
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Product details
Overview
SMBJ12AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 30.2 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), making it suitable for protecting MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMBJ12AHM3/I datasheet, SMBJ12AHM3/I pinout, SMBJ12AHM3/I application, or SMBJ12AHM3/I equivalent, key selection criteria include its unidirectional polarity, AEC-Q101 qualification status (via HM3 suffix), low thermal resistance (RθJL = 20 °C/W), and halogen-free RoHS compliance - critical for automotive-grade ESD and load-switching surge protection.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuitry, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 13.3–14.7 V at IT = 1 mA). Its glass-passivated junction ensures stable avalanche behavior under repetitive 10/1000 µs surges at 0.01% duty cycle.
Thermal performance is defined by RθJA = 100 °C/W (on standard 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C. The cathode band marking confirms unidirectional polarity, and the device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V rail protection. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamped voltage seen by protected circuit during 600 W transient; limits stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 4 surges. |
| IFSM | 100 A - Peak forward surge current rating (8.3 ms half-sine); supports robustness against inrush or fault currents. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient environments like engine control units. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated SMT placement. |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads, polarity indicated by cathode band on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per datasheet recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line. | Enables unidirectional clamping - conducts only when cathode is >13.3 V above anode, protecting against positive transients. |
| Cathode | Current exit point in forward bias; marked with band; connected to higher-potential side (e.g., VIN rail). | Defines clamping reference - voltage across device rises to VC = 19.9 V when transient exceeds VWM, shunting surge to ground or return path. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates immunity to severe lightning-induced surges per IEC 61000-4-5, supporting industrial and automotive front-end protection. |
| AEC-Q101 qualified (HM3 suffix) | Confirms reliability for automotive applications including body electronics and powertrain modules where qualification is mandatory. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains without compromising electrical performance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, reducing voltage stress on protected ICs such as microcontrollers and gate drivers. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power rails from load-dump and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 12 V supply and ground, triggered within <1 ps to limit voltage to ≤19.9 V. Use Value: Prevents latch-up or permanent damage to 5 V logic interfaces during 12 V system surges, extending field reliability beyond 10 years. |
Use Scenario: Shields 24 V digital input circuits in programmable logic controllers from relay coil flyback and ESD events in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across input terminals to clamp transients before they reach optocoupler input stages. Use Value: Maintains signal integrity under repeated 1 kV/500 A surge tests (IEC 61000-4-5), eliminating false triggering and unplanned downtime. |
| Telecom Power Supply Input Stage | Consumer Appliance Motor Driver Protection |
|
Use Scenario: Safeguards AC/DC adapter primary-side controller ICs from line surges and lightning-induced spikes on 48 V telecom distribution lines. IC Role / Device Role / Timing Role: Primary-side TVS connected between rectified DC bus and ground, absorbing energy before it reaches PWM controller. Use Value: Enables compliance with GR-1089-CORE surge immunity requirements while maintaining compact SMB footprint. |
Use Scenario: Protects H-bridge MOSFET gates and bootstrap capacitors from voltage reversal during brushless DC motor commutation. IC Role / Device Role / Timing Role: Local clamping device across gate-source or supply-rail nodes to suppress ringing and dv/dt-induced shoot-through. Use Value: Reduces gate oxide stress and prevents unintended FET turn-on, improving motor driver MTBF by >35% in 24 V appliance designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHE3/I | Same electrical specs and SMB package, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Lacks automotive qualification; suitable for consumer or industrial non-automotive use where halogen-free is not mandated. | Select SMBJ12AHE3/I for cost-sensitive commercial designs where AEC-Q101 and halogen-free are not required. |
| SMAJ12A-M3 | Lower peak pulse power (400 W vs. 600 W), same VWM/VC, but in smaller SMA (DO-214AC) package with higher RθJA (140 °C/W). | Reduced surge handling margin; limited to lower-energy transients and less thermally demanding PCB layouts. | Choose SMAJ12A-M3 only when board space is constrained and surge threat level is below IEC 61000-4-5 Level 3. |
Compared with SMBJ12AHM3/I, SMBJ12AHE3/I offers identical clamping performance without automotive qualification or halogen-free assurance, while SMAJ12A-M3 trades 33% lower pulse power and inferior thermal resistance for a 30% smaller footprint - requiring careful trade-off analysis per application severity and layout constraints.
Availability
SMBJ12AHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom power supply surge hardening requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ12AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and telecom systems where AEC-Q101 qualification and consistent clamping performance are essential.
FAQ
What is the clamping voltage of SMBJ12AHM3/I at its rated peak pulse current?
The SMBJ12AHM3/I has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 30.2 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during surge events. Designers must ensure downstream components tolerate this clamped voltage under worst-case transient conditions. The SMBJ12AHM3/I maintains this performance across its full operating temperature range.
Is SMBJ12AHM3/I qualified for automotive applications?
Yes, SMBJ12AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its part number - indicating halogen-free, RoHS-compliant, and automotive-grade construction. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge robustness required for under-hood and body electronics. The SMBJ12AHM3/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix and is used in production automotive BCM and lighting modules.
What does the "HM3" suffix mean in SMBJ12AHM3/I?
The "HM3" suffix in SMBJ12AHM3/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - distinguishing it from commercial-grade variants like E3. It specifies that the molding compound contains no brominated or chlorinated flame retardants, complies with EU RoHS Directive 2011/65/EU, and has passed all AEC-Q101 stress tests. The "I" indicates 13-inch tape-and-reel packaging (3200 units per reel), optimized for high-volume SMT assembly lines.
How does SMBJ12AHM3/I differ from bidirectional TVS diodes like SMBJ12CA?
SMBJ12AHM3/I is unidirectional and functions only during reverse-voltage transients (anode negative relative to cathode), while SMBJ12CA is bidirectional and clamps in both polarities. The SMBJ12AHM3/I has a forward voltage drop (~3.5 V at 50 A) and is suited for DC rail protection, whereas SMBJ12CA is used in AC-coupled or differential signal lines. Their VBR and VC values differ: SMBJ12AHM3/I has VBR = 13.3–14.7 V, while SMBJ12CA has symmetric breakdown in both directions.
What is the thermal resistance from junction to lead (RθJL) for SMBJ12AHM3/I?
The SMBJ12AHM3/I has a typical thermal resistance from junction to lead (RθJL) of 20 °C/W, as specified in Vishay's datasheet. This low value enables efficient heat transfer from the silicon die to the PCB copper through the device leads, supporting sustained power dissipation in compact layouts. When mounted on recommended 0.2" × 0.2" copper pads, the SMBJ12AHM3/I achieves RθJA = 100 °C/W - critical for thermal design validation in high-temperature environments like automotive junction boxes.
SMBJ12AHM3/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:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ12AHM3/I FAQ
1.How can I place an order for SMBJ12AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHM3/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 SMBJ12AHM3/I reliable?
The price and inventory of SMBJ12AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ12AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHM3/I?
SMBJ12AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHM3/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 SMBJ12AHM3/I?
For technical support, including SMBJ12AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHM3/I requirements.
6.How does Aetrix verify that SMBJ12AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHM3/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 SMBJ12AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ12AHM3/I?
All SMBJ12AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHM3/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 SMBJ12AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ12AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12AHM3/I Tags
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