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Vishay General Semiconductor - Diodes Division SMBJ12CAHM3_A/I
- Part No.:
- SMBJ12CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,959
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Product details
Overview
SMBJ12CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power 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 rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ12CAHM3_A/I datasheet, SMBJ12CAHM3_A/I pinout, SMBJ12CAHM3_A/I application, or SMBJ12CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance, enabling consistent clamping performance across repetitive transients.
The SMBJ12CAHM3_A/I delivers fast response time (<1 ps) and meets UL 497B recognition for telecom protectors (QVGQ2). It is rated for -55 °C to +150 °C operating junction temperature and exhibits a VBR range of 13.3–14.7 V at 1 mA test current, with ±0.083 %/°C temperature coefficient of breakdown voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for protected circuitry. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on under ESD or surge events. |
| VC @ IPPM | 19.9 V at 30.2 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPPM | 600 W - peak pulse power handling with 0.01 % duty cycle; supports robust protection against lightning-induced surges. |
| IPPM | 30.2 A - peak surge current capacity under standard 10/1000 µs waveform; correlates directly with system-level surge immunity level. |
| TJ max | +150 °C - maximum junction temperature; enables reliable operation in high-ambient industrial environments without derating. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; optimized for automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts surge current from either direction; connects to line being protected (e.g., RS-485 A/B, USB D+/D-, DC input). |
| Cathode | Transient current return path (bidirectional) | Completes low-impedance path to ground or reference rail during clamping; requires low-inductance layout to minimize VC overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetric protection on AC-coupled or differential signal lines (e.g., CAN, RS-485) without polarity concerns. |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with minimal trace inductance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer electronics without compromising thermal or electrical performance. |
| MSL Level 1 (260 °C peak reflow) | Allows single-pass lead-free reflow assembly without moisture-related popcorn failure risk - eliminates bake preconditioning step. |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback signal lines in variable-frequency drives from inductive switching spikes. IC Role / Device Role / Timing Role: Voltage clamping element placed across MOSFET gate-source or op-amp inputs to limit transient overvoltage. Use Value: Prevents latch-up or permanent damage to control ICs by limiting gate voltage to ≤19.9 V during 30.2 A surge events. |
Use Scenario: Shielding LIN bus or analog sensor outputs (e.g., pressure, temperature) from battery dump and load-switching transients. IC Role / Device Role / Timing Role: Bidirectional transient suppressor connected between signal line and chassis ground in automotive ECUs. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 1/2a/5a tests by clamping to 19.9 V while surviving >1000 surges. |
| Telecom Power Input | Consumer USB Port Protection |
|
Use Scenario: Safeguarding 12 V DC input rails of base station power modules against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters and PMICs. Use Value: Absorbs up to 600 W transient energy without degradation, preserving downstream converter reliability under repeated surge exposure. |
Use Scenario: Protecting USB 2.0 data lines (D+/D-) and VBUS against ESD and hot-plug transients in portable devices. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector to shunt ESD current before reaching USB transceiver. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <20 V within <1 ns, preventing bit errors or PHY lockup in USB enumeration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CAHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable only for non-automotive industrial/commercial use. | Select when AEC-Q101 and halogen-free requirements are not mandated, and cost optimization is prioritized. |
| SMAJ12CAHM3_A/I | Lower 400 W PPPM, same VWM/VC, SMA (DO-214AC) package - smaller footprint (4.57 mm × 2.69 mm) but higher thermal resistance. | Reduced surge handling limits suitability to lower-energy transients (e.g., IEC 61000-4-2 ESD only, not IEC 61000-4-5). | Choose when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
Compared with SMBJ12CAHE3_A/I, the SMBJ12CAHM3_A/I adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ12CAHM3_A/I, it provides 50 % higher surge power handling and superior thermal dissipation in the larger SMB package.
Availability
SMBJ12CAHM3_A/I is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, telecom power input, and consumer USB port protection requiring stable component supply across production lifecycles.
Supply support for SMBJ12CAHM3_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 is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ12CAHM3_A/I at its rated peak pulse current?
The SMBJ12CAHM3_A/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 double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2.
Is SMBJ12CAHM3_A/I suitable for automotive applications?
Yes, SMBJ12CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification - making it appropriate for use in ADAS sensors, body control modules, and infotainment interfaces where reliability under thermal and electrical stress is mandatory.
How does the bidirectional design of SMBJ12CAHM3_A/I affect its PCB layout?
The bidirectional design of SMBJ12CAHM3_A/I eliminates polarity constraints - no cathode band marking is present, and either terminal may connect to the protected line or ground. Layout must prioritize low-inductance paths: short, wide traces to ground plane, symmetric placement relative to differential pairs, and avoidance of vias in the surge current path to prevent VC overshoot beyond 19.9 V during fast transients.
What is the maximum operating temperature for SMBJ12CAHM3_A/I?
The SMBJ12CAHM3_A/I has a specified operating junction temperature range of -55 °C to +150 °C. Its thermal resistance from junction to ambient (RθJA) is 100 °C/W under standard mounting conditions (0.2" × 0.2" copper pads), meaning it can sustain full 600 W surge capability only at low ambient temperatures unless heatsinking or enhanced copper area is applied.
Does SMBJ12CAHM3_A/I meet any safety certifications?
Yes, SMBJ12CAHM3_A/I carries Underwriters Laboratories (UL) recognition under file number E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for telecommunications protectors. It also meets MSL Level 1 per J-STD-020, allowing direct placement into lead-free reflow ovens without pre-baking.
SMBJ12CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ12CAHM3_A/I FAQ
1.How can I place an order for SMBJ12CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHM3_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 SMBJ12CAHM3_A/I reliable?
The price and inventory of SMBJ12CAHM3_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 SMBJ12CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHM3_A/I?
SMBJ12CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHM3_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 SMBJ12CAHM3_A/I?
For technical support, including SMBJ12CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ12CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHM3_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 SMBJ12CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHM3_A/I?
All SMBJ12CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHM3_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 SMBJ12CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ12CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHM3_A/I Tags
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