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Vishay General Semiconductor - Diodes Division SMBJ12AHM3_B/H
- Part No.:
- SMBJ12AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHM3_B/H.pdf
- Description:
- 600W,12V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,248
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Product details
Overview
SMBJ12AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 30.2 A peak pulse current (10/1000 µs), and 600 W peak pulse power rating. Used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive control modules.
For engineers reviewing the SMBJ12AHM3_B/H datasheet, SMBJ12AHM3_B/H pinout, SMBJ12AHM3_B/H application, or SMBJ12AHM3_B/H equivalent, this page delivers verified electrical parameters, thermal behavior under surge conditions, AEC-Q101 qualification status, and real-world protection use cases - all aligned with Vishay Document #88392 (Rev. 09-Jan-2024).
Technical Context
This TVS diode operates as a voltage-clamping device in unidirectional configuration, with cathode-banded polarity marking. Its silicon junction is glass passivated for stable breakdown characteristics and low leakage (<5.0 µA at 12 V). The device responds within <1.0 ns to transients and maintains clamping performance across -55 °C to +150 °C junction temperature range.
Thermal design relies on its 20 °C/W junction-to-lead resistance and 100 °C/W junction-to-ambient rating (on 5.0 mm × 5.0 mm copper pads). It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak, with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1.0 mA - Confirmed minimum/maximum breakdown range ensuring reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 19.9 V at IPPM = 30.2 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; critical for downstream IC survival. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized 10/1000 µs waveform; enables robust IEC 61000-4-5 Level 4 compliance. |
| ID (Reverse Leakage) | ≤5.0 µA at VWM - Low leakage preserves system efficiency and prevents false triggering in high-impedance sensing paths. |
| TJ max. | +150 °C - Maximum junction temperature rating supporting operation in under-hood automotive and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads. Cathode identified by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional clamp | Connected to ground or low-impedance return path; carries full surge current during clamping. |
| Cathode | High-side connection, marked with band | Connected to protected line (e.g., 12 V rail or signal trace); defines polarity-sensitive clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 4 kV (line-earth) without cascaded stages. |
| 19.9 V clamping at 30.2 A | Keeps protected 12 V logic rails below 20 V during surge, preserving interface ICs rated to 24 V absolute maximum. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and humidity is mandatory. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination risks. |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing drift in long-life industrial equipment deployments. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply rail and LIN bus lines from load dump and inductive switching spikes in BCMs. IC Role / Device Role: Unidirectional TVS placed between VBAT and GND, and across LIN signal pair. Use Value: Clamps transients to ≤19.9 V, preventing damage to LIN transceivers and microcontroller I/O pins rated for 24 V max. |
Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges in factory automation PLCs. IC Role / Device Role: TVS mounted at connector entry point, shunting surge energy to chassis ground before optocoupler input stage. Use Value: Limits voltage excursion to <20 V during 1 kV/500 A surge events, maintaining isolation integrity and preventing false triggering. |
| Telecom Power Supply Front-End | Automotive Sensor Interface (e.g., ABS Wheel Speed) |
Use Scenario: Secondary-level surge suppression on +48 V telecom rectifier outputs feeding DC-DC converters. IC Role / Device Role: Standoff-rated TVS (VWM = 12 V not applicable here; SMBJ48A used in same family) - *not applicable to SMBJ12AHM3_B/H*. Use Value: N/A - SMBJ12AHM3_B/H is specified for 12 V systems only; 48 V applications require higher-VWM variant. |
Use Scenario: Protecting differential Hall-effect sensor signal lines (VCC, GND, OUT+) from ESD and cable discharge in wheel speed sensors. IC Role / Device Role: Discrete unidirectional TVS on each signal line referenced to local sensor ground. Use Value: Sub-1 ns response and 19.9 V clamping ensure analog front-end remains within safe operating area during 8 kV contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHE3_B/H | Same electrical specs, RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Approved for commercial/industrial use only; excluded from automotive production BOMs requiring AEC-Q101. | Select when cost sensitivity outweighs automotive qualification needs and halogen-free requirement is waived. |
| SMBJ12CAHM3_B/H | Bidirectional variant; symmetric VBR (13.3–14.7 V) in both directions; no polarity marking. | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, CAN FD) where reverse polarity surges occur. | Choose only if protecting non-polarized interfaces; not interchangeable with SMBJ12AHM3_B/H due to polarity and clamping asymmetry. |
Compared with SMBJ12AHE3_B/H and SMBJ12CAHM3_B/H, the SMBJ12AHM3_B/H uniquely combines halogen-free construction, AEC-Q101 qualification, and unidirectional clamping - making it the sole choice for automotive 12 V rail protection where regulatory compliance and material restrictions are enforced.
Availability
SMBJ12AHM3_B/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and sensor interface hardening requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ12AHM3_B/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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on reliability, precision, and application-specific validation.
The SMBJ series targets board-level transient protection in automotive, industrial, and telecom systems, delivering standardized 600 W surge handling in compact SMB packages with AEC-Q101 and RoHS/halogen-free variants.
FAQ
What is the clamping voltage of SMBJ12AHM3_B/H at its rated peak pulse current?
The SMBJ12AHM3_B/H has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current using the 10/1000 µs waveform. This value is measured per Vishay Document #88392 and defines the upper voltage limit imposed on protected circuits during surge events. Designers must verify that downstream components tolerate this clamped level under worst-case surge conditions. The SMBJ12AHM3_B/H achieves this with low incremental surge resistance and sub-nanosecond response.
Is SMBJ12AHM3_B/H qualified for automotive applications?
Yes, SMBJ12AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in Revision 09-Jan-2024 of Document #88392. This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). The SMBJ12AHM3_B/H is approved for use in automotive body electronics, infotainment power rails, and sensor interfaces where reliability under thermal and mechanical stress is mandatory.
What does the "HM3" suffix indicate in SMBJ12AHM3_B/H?
The "HM3" suffix in SMBJ12AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts meet JESD 201 Class 2 whisker resistance and are rated for peak reflow of 260 °C. This distinguishes SMBJ12AHM3_B/H from E3 (RoHS only), HE3 (AEC-Q101 + RoHS), and M3 (halogen-free + RoHS, no AEC-Q101) variants. The "B/H" denotes 7″ tape-and-reel packaging with 750 units per reel.
Can SMBJ12AHM3_B/H be used in bidirectional signal protection?
No, SMBJ12AHM3_B/H is strictly unidirectional and must be installed with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled signals), the SMBJ12CAHM3_B/H variant is required. Using SMBJ12AHM3_B/H in reverse-biased configurations results in forward conduction at ~0.7–1.0 V, offering no meaningful surge suppression and risking device failure. Always match polarity and directionality to the application's signal architecture.
What is the thermal resistance profile of SMBJ12AHM3_B/H?
SMBJ12AHM3_B/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient resistance (RθJA) of 100 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. These values are critical for calculating temperature rise during repetitive surge events or sustained power dissipation. The SMBJ12AHM3_B/H's RθJL enables effective heat transfer to PCB copper, while its RθJA informs layout decisions such as pad size, thermal vias, and adjacent component spacing to maintain TJ ≤ 150 °C.
SMBJ12AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- 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_B/H FAQ
1.How can I place an order for SMBJ12AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHM3_B/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 SMBJ12AHM3_B/H reliable?
The price and inventory of SMBJ12AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ12AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHM3_B/H?
SMBJ12AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHM3_B/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 SMBJ12AHM3_B/H?
For technical support, including SMBJ12AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ12AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHM3_B/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 SMBJ12AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ12AHM3_B/H?
All SMBJ12AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHM3_B/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 SMBJ12AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ12AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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