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Vishay General Semiconductor - Diodes Division SMBJ12AHM3/H
- Part No.:
- SMBJ12AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHM3/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
SMBJ12AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails 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 industrial motor drives, automotive body control modules, and industrial I/O interfaces.
For engineers reviewing the SMBJ12AHM3/H datasheet, SMBJ12AHM3/H pinout, SMBJ12AHM3/H application, or SMBJ12AHM3/H equivalent, this page delivers verified electrical parameters, thermal behavior under surge conditions, halogen-free RoHS-compliant construction, AEC-Q101 qualification status, and real-world design implications for PCB layout, clamping margin, and system-level ESD/lightning immunity.
Technical Context
The SMBJ12AHM3/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to clamp transients while blocking normal forward-biased operation. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<5 µA at VWM), with thermal resistance RθJA = 100 °C/W enabling reliable operation up to TJ = 150 °C.
It delivers 600 W peak pulse power per 10/1000 µs waveform at 25 °C ambient, derating linearly above 25 °C per Figure 2, and supports repetitive surges at 0.01% duty cycle. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications - confirmed by HM3 suffix and "_H" tape-and-reel packaging code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse voltage before significant leakage; sets minimum operating margin for protected circuit. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed avalanche onset range; defines turn-on threshold for transient suppression. |
| VC (Clamping Voltage) | 19.9 V at 30.2 A - Measured peak voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized surge waveform; enables protection against IEC 61000-4-5 Level 3/4 events. |
| IPPM (Peak Pulse Current) | 30.2 A - Maximum non-repetitive surge current it can divert without failure; used to size PCB trace width and grounding paths. |
| TJmax | 150 °C - Maximum junction temperature; constrains thermal design and power dissipation in high-duty-cycle environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.21 mm × 4.06 mm footprint; compatible with automated placement and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR; polarity must match PCB silkscreen marking. |
| Anode | Reference / ground return path | Typically tied to system ground plane; low-inductance connection essential to minimize clamping overshoot during fast transients. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5, reducing need for cascaded protection stages. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive under-hood and body electronics; supports long-term reliability in temperature-cycled, vibration-prone environments. |
| Halogen-free, RoHS-compliant (HM3) | Meets environmental compliance requirements for global OEMs and industrial equipment without compromising surge performance. |
| Low incremental surge resistance | Minimizes VC rise under high di/dt transients, preserving safe operating area for sensitive 12 V logic and microcontrollers. |
| Fast response time (<1 ps) | Clamps sub-nanosecond ESD events before damage occurs to CMOS inputs, eliminating need for additional TVS staging on high-speed lines. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 12 V supply rail feeding gate drivers and position sensors in BLDC motor controllers exposed to inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, clamping voltage spikes generated during MOSFET switching transitions. Use Value: Limits rail voltage excursion to ≤19.9 V during 30 A transients, preventing latch-up or oxide breakdown in 3.3 V/5 V logic supplies downstream. |
Use Scenario: Surge protection on LIN bus lines and power inputs in door module ECUs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V input and LIN signal line, absorbing ISO 7637-2 Pulse 1/2/5a energy without degradation. Use Value: Maintains functional integrity during 120 V/50 ms load dump events by clamping within spec while retaining AEC-Q101 qualification for automotive lifecycle. |
| Industrial I/O Interfaces | Consumer Power Adapters |
|
Use Scenario: Input-side protection of 24 V PLC digital input cards connected to field sensors prone to wiring-induced transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact input terminals, shunting surge current away from optocoupler input stage. Use Value: Ensures <5 µA leakage at 24 V nominal, preserving input sensitivity while surviving repeated 600 W surges per IEC 61000-4-4. |
Use Scenario: Secondary-side DC output protection in 12 V wall adapters for smart home devices vulnerable to AC line transients coupling through transformer. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 12 V output rail, guarding USB-C PD negotiation ICs and PMICs from residual surges. Use Value: Provides 19.9 V clamping ceiling that aligns with 15 V absolute maximum ratings of common USB-PD controllers, avoiding overvoltage shutdown. |
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/H | Same electrical specs, but RoHS-compliant commercial grade (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Approved for industrial/commercial use only; not certified for automotive production programs requiring AEC-Q101. | Select SMBJ12AHE3/H if halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMAJ12A-HF | Lower 400 W PPPM, SMA package (smaller footprint), higher VC = 20.1 V at 24.7 A; same VWM/VBR range. | Used where board space is constrained and 400 W surge margin suffices; less robust for heavy industrial transients. | Choose SMAJ12A-HF only when PCB area is critical and system-level surge testing confirms 400 W adequacy. |
Compared with SMBJ12AHE3/H, SMBJ12AHM3/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ12A-HF, it provides +50% peak power headroom and lower clamping voltage in a slightly larger but thermally superior SMB package.
Availability
SMBJ12AHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and industrial I/O interfaces requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBJ12AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping, thermal stability, and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMBJ12AHM3/H at its rated peak pulse current?
The SMBJ12AHM3/H has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per standard test method and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring compatibility with downstream ICs rated for ≤20 V absolute maximum.
Is SMBJ12AHM3/H qualified for automotive applications?
Yes, SMBJ12AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix and documentation in Vishay's datasheet revision 09-Jan-2024. This qualification validates its performance across temperature cycling, humidity bias, mechanical shock, and surge endurance tests required for automotive electronic control units, including body electronics and powertrain subsystems.
What does the "HM3" suffix indicate for SMBJ12AHM3/H?
The "HM3" suffix in SMBJ12AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from commercial-grade variants (e.g., E3) and confirms compliance with automotive environmental and reliability standards - essential for Tier 1 suppliers and OEMs enforcing strict material declarations and qualification mandates.
How does SMBJ12AHM3/H differ from SMBJ12AHE3/H?
SMBJ12AHM3/H and SMBJ12AHE3/H share identical electrical characteristics (VWM, VBR, VC, PPPM) and package, but differ in material compliance and qualification: HM3 is halogen-free and AEC-Q101 qualified, whereas HE3 is RoHS-compliant only (non-halogen-free) and lacks automotive qualification. Both use the same "H" tape-and-reel packaging format.
What is the thermal resistance of SMBJ12AHM3/H, and how does it affect layout?
SMBJ12AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. This value guides PCB thermal design: to maintain TJ ≤ 150 °C under 5 W steady-state dissipation, designers must ensure adequate copper area, minimize trace length to ground planes, and avoid thermal bottlenecks near the SMBJ12AHM3/H mounting location.
SMBJ12AHM3/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:
- 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/H FAQ
1.How can I place an order for SMBJ12AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHM3/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/H reliable?
The price and inventory of SMBJ12AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ12AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHM3/H?
SMBJ12AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHM3/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/H?
For technical support, including SMBJ12AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHM3/H requirements.
6.How does Aetrix verify that SMBJ12AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ12AHM3/H?
All SMBJ12AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ12AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12AHM3/H Tags
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