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Vishay General Semiconductor - Diodes Division SMBJ12AHM3_A/I
- Part No.:
- SMBJ12AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,459
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Product details
Overview
SMBJ12AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the 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), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V maximum 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 interfaces and industrial I/O protection.
For engineers reviewing the SMBJ12AHM3_A/I datasheet, SMBJ12AHM3_A/I pinout, SMBJ12AHM3_A/I application, or SMBJ12AHM3_A/I equivalent, this device is selected for robust overvoltage protection where low clamping ratio, AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 reflow capability are required in space-constrained PCB layouts.
Technical Context
The SMBJ12AHM3_A/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to shunt surge energy to ground. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<5 µA at VWM), while the 20 °C/W junction-to-lead thermal resistance supports reliable power dissipation under repetitive surges.
Designed for automated SMT assembly, it meets JESD22-B102 solderability and JESD201 Class 2 whisker resistance standards. The cathode band marking identifies polarity, and its DO-214AA outline enables compatibility with standard SMB footprint land patterns used across automotive and industrial control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 12 V rail protection. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown window ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamping voltage during 600 W surge; limits downstream IC stress to <20 V under worst-case transients. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates protection against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - Maximum junction temperature rating enables operation in under-hood automotive environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| MSL Level | Level 1 (260 °C peak) - Supports lead-free reflow without moisture-induced damage; no bake required prior to assembly. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with cathode band marking on one end. Dimensions: 5.59 mm × 4.06 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for J-STD-002-compliant soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to protected line (e.g., 12 V supply or signal trace); conducts surge current toward cathode during overvoltage. |
| Cathode | Clamping reference / Ground return | Marked by band; tied to system ground or low-impedance return plane; establishes clamping voltage relative to GND. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles IEC 61000-4-5 surge waveforms up to 4 kV (line-earth) without degradation in standard PCB layout. |
| 19.9 V clamping at 30.2 A | Clamping ratio of 1.66 (VC/VWM) ensures minimal overvoltage exposure to downstream 12 V logic or analog circuitry. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
| MSL Level 1 reflow rating | Enables single-pass lead-free reflow at 260 °C without popcorn cracking or delamination risk. |
| Glass-passivated junction | Provides stable VBR drift <0.083 %/°C and long-term leakage stability under thermal cycling. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground to clamp transients before reaching ADC input or microcontroller GPIO. Use Value: Limits voltage excursion to ≤19.9 V during 30.2 A surge, preserving signal integrity and preventing latch-up in 12 V domain receivers. |
Use Scenario: Safeguarding 24 V DC digital inputs on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at connector entry point to absorb inductive kickback before reaching optocoupler or Schmitt trigger input stage. Use Value: Withstands 600 W surges without failure, enabling >100,000 surge cycles per IEC 61000-4-5 while maintaining <5 µA leakage at 12 V nominal. |
| Consumer Power Adapter Output Clamp | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-side overvoltage suppression on 12 V output rails of AC/DC adapters subject to capacitor discharge and hot-plug events. IC Role / Device Role / Timing Role: Fast-response TVS connected across output capacitor to clamp overshoot during regulation loop instability or short-circuit recovery. Use Value: Sub-nanosecond response time limits transient duration, reducing stress on downstream DC-DC converters and USB-PD controllers. |
Use Scenario: Primary protection for Ethernet PHY power pins (e.g., MDI interface) against lightning-induced surges on telecom infrastructure equipment. IC Role / Device Role / Timing Role: First-stage unidirectional suppressor on 12 V bias rail feeding magnetics or PoE controller ICs. Use Value: Halogen-free HM3 construction satisfies telecom flame-retardancy requirements (UL 94 V-0), while 150 °C TJ rating supports sealed enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHE3_A/I | Same electrical specs but RoHS-compliant (non-halogen-free) commercial grade; lacks AEC-Q101 qualification. | Approved for industrial/commercial use only; not certified for automotive under-hood deployment. | Select when AEC-Q101 is not required and cost optimization is prioritized over halogen-free compliance. |
| SMAJ12A-M3 | Lower 400 W PPPM, larger SMA (DO-214AC) package, same VWM/VC but higher RθJA (150 °C/W). | Less robust for high-repetition surges; requires larger PCB area and derating above 75 °C ambient. | Choose only if legacy SMA footprint is fixed and 600 W rating is not mandated by system-level surge test plan. |
Compared with SMBJ12AHE3_A/I, the SMBJ12AHM3_A/I adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ12A-M3, it delivers +50% pulse power headroom and superior thermal performance in a smaller, more manufacturable package.
Availability
SMBJ12AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC digital inputs, and telecom line card surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ12AHM3_A/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, efficiency, and application-specific validation.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and communications systems, engineered for fast response, stable clamping, and seamless integration into automated SMT production lines.
FAQ
What is the maximum clamping voltage of SMBJ12AHM3_A/I under a 600 W surge?
The SMBJ12AHM3_A/I has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current, corresponding to the 10/1000 µs waveform defined in IEC 61000-4-5. This value is measured and guaranteed per Vishay's datasheet revision 09-Jan-2024, Document Number 88392. The SMBJ12AHM3_A/I maintains this clamping performance across its rated junction temperature range of -55 °C to +150 °C.
Is SMBJ12AHM3_A/I qualified for automotive applications?
Yes, SMBJ12AHM3_A/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and documentation in Vishay's official datasheet. It undergoes stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 Rev D. The SMBJ12AHM3_A/I is approved for use in automotive subsystems such as body control modules, sensor interfaces, and infotainment power supplies.
What does the "HM3" suffix indicate for SMBJ12AHM3_A/I?
The "HM3" suffix in SMBJ12AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from non-automotive variants like "E3" (RoHS-compliant commercial grade) and "HE3" (AEC-Q101 qualified but not halogen-free). The SMBJ12AHM3_A/I meets IPC-1752A material declarations and UL 94 V-0 flammability requirements per its SMB package molding compound.
Can SMBJ12AHM3_A/I be used in bidirectional configurations?
No, SMBJ12AHM3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMBJ12CA). Using SMBJ12AHM3_A/I in reverse-biased configurations risks permanent damage due to forward conduction beyond its 3.5 V max VF at 50 A. For symmetric surge protection, select SMBJ12CA-HM3 or equivalent.
What is the thermal resistance from junction to ambient for SMBJ12AHM3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) of SMBJ12AHM3_A/I is 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet. Its lower junction-to-lead resistance (RθJL = 20 °C/W) enables effective heat transfer to PCB copper, supporting sustained 5.0 W power dissipation at TA = 50 °C - critical for SMBJ12AHM3_A/I reliability in enclosed industrial enclosures.
SMBJ12AHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ12AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHM3_A/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_A/I reliable?
The price and inventory of SMBJ12AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ12AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHM3_A/I?
SMBJ12AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHM3_A/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_A/I?
For technical support, including SMBJ12AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ12AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ12AHM3_A/I?
All SMBJ12AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ12AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12AHM3_A/I Tags
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