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Vishay General Semiconductor - Diodes Division SMBJ12CAHM3_A/H
- Part No.:
- SMBJ12CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHM3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,626
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Product details
Overview
SMBJ12CAHM3_A/H 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), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤19.9 V at 30.2 A peak surge current. It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ12CAHM3_A/H datasheet, SMBJ12CAHM3_A/H pinout, SMBJ12CAHM3_A/H application, or SMBJ12CAHM3_A/H equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and real-world protection use cases - all confirmed from Vishay's official SMBJ5.0A–SMBJ188A datasheet (Rev. 09-Jan-2024, Doc. #88392).
Technical Context
This TVS diode operates bidirectionally with symmetrical clamping in both polarities, enabling robust protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance reflects standard SMB package dissipation limits under defined pad layout (0.2" × 0.2" copper).
The device meets J-STD-020 MSL Level 1 (peak reflow 260 °C), supports automated placement, and is halogen-free and RoHS-compliant per HM3 suffix. It is rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101 for automotive-grade reliability when ordered with HM3_X suffix (e.g., SMBJ12CAHM3_A/H).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - Confirmed breakdown range ensuring predictable turn-on during transients. |
| VC @ IPPM | ≤19.9 V at 30.2 A - Clamping voltage under 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; defines transient energy absorption limit per IEC 61000-4-5. |
| ID @ VWM | ≤5 µA - Reverse leakage current at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design boundary for PCB layout and power derating. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; used to calculate temperature rise under DC bias. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads, MSL Level 1 compliant. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One end of symmetrical PN junction; connects to line under protection (e.g., RS-485 A or CAN_H). |
| Cathode | Terminal K | Other end of symmetrical PN junction; connects to same line (e.g., RS-485 B or CAN_L); no polarity marking required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential or AC signal lines (e.g., USB D+/D−, RS-422) without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial interfaces. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes overvoltage exposure to downstream ICs compared to higher-ratio suppressors. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity handling or baking. |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting gate drivers and microcontroller I/O pins from inductive kickback during relay or solenoid switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across motor driver output terminals or MCU GPIO lines. Use Value: Limits transient voltage to ≤19.9 V, preventing latch-up or oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding LIN bus transceivers and sensor inputs (e.g., ambient temperature, door position) against load dump and ESD. IC Role / Device Role / Timing Role: TVS connected between LIN data line and ground, leveraging AEC-Q101 qualification for automotive longevity. Use Value: Withstands 30.2 A surge current and maintains <5 µA leakage, preserving bus integrity during sleep mode. |
| Telecom Power Supply Input | Consumer USB-C Port Protection |
|
Use Scenario: Clamping surges on 12 V DC input rails of PoE-powered network switches or base stations. IC Role / Device Role / Timing Role: Primary TVS on bulk input stage, upstream of DC-DC converters and EMI filters. Use Value: Absorbs 600 W pulses without degradation, maintaining system uptime during lightning-induced grid disturbances. |
Use Scenario: Providing secondary-level overvoltage protection on USB-C CC and VBUS lines alongside primary ESD arrays. IC Role / Device Role / Timing Role: Bidirectional clamp across VBUS and GND to suppress 10/1000 µs surges beyond ESD diode capability. Use Value: Low 12 V VWM allows operation with 5–20 V PD profiles while clamping fast transients before they reach USB controller. |
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/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating without halogen-free constraint. | Approved for industrial/commercial designs where automotive qualification is unnecessary; lower cost than HM3 variant. | Select when AEC-Q101 is not required and halogen-free compliance is optional. |
| SMAJ12CAHM3_A/H | Lower 400 W peak pulse power (vs. 600 W), same VWM/VBR/VC, but in smaller SMA (DO-214AC) package with higher RθJA (140 °C/W). | Suitable for space-constrained layouts with lower surge threat levels (e.g., consumer USB ports vs. industrial motor drives). | Choose only if board area is critical and surge energy remains within 400 W rating; verify thermal margin due to reduced heat dissipation. |
Compared with SMBJ12CAHM3_A/H, SMBJ12CAHE3_A/H offers identical protection performance without automotive qualification, while SMAJ12CAHM3_A/H trades 33 % lower surge capacity and higher thermal resistance for 30 % smaller footprint - requiring explicit validation of both energy and thermal margins in final design.
Availability
SMBJ12CAHM3_A/H is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, telecom power supply input, and consumer USB-C port protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ12CAHM3_A/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where robustness against inductive switching and lightning surges is essential.
FAQ
What does the "CA" suffix mean in SMBJ12CAHM3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ12CAHM3_A/H provides symmetrical clamping in both forward and reverse directions, making it suitable for protecting AC-coupled or differential signal lines like RS-485, CAN, or USB without polarity concerns. This differs from unidirectional "A" variants, which require correct anode/cathode orientation relative to ground.
Is SMBJ12CAHM3_A/H AEC-Q101 qualified?
Yes, SMBJ12CAHM3_A/H is AEC-Q101 qualified - confirmed by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified) and Vishay's ordering information table (page 3, Doc. #88392). This qualification covers stress tests including temperature cycling, mechanical shock, and high-temperature operating life, validating its use in automotive body electronics and powertrain modules.
What is the clamping voltage of SMBJ12CAHM3_A/H at its rated surge current?
The clamping voltage (VC) of SMBJ12CAHM3_A/H is guaranteed ≤19.9 V at its peak pulse current (IPPM) of 30.2 A, measured using the standard 10/1000 µs waveform. This value is specified in the Electrical Characteristics table (page 2, Doc. #88392) and defines the maximum voltage seen by protected circuitry during worst-case surge events.
Can SMBJ12CAHM3_A/H be used in place of a unidirectional TVS like SMBJ12AHM3_A/H?
No - SMBJ12CAHM3_A/H is bidirectional and lacks polarity marking, while SMBJ12AHM3_A/H is unidirectional with a cathode band. Substituting them requires verifying circuit topology: bidirectional use is mandatory for floating or AC signals, whereas unidirectional types are needed for DC-biased lines referenced to ground. Interchange may cause failure to clamp or unintended conduction.
What is the thermal resistance and how does it affect PCB layout for SMBJ12CAHM3_A/H?
SMBJ12CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperature under sustained power dissipation, designers must ensure adequate copper area and avoid excessive trace length or isolation - especially important in high-duty-cycle or multi-pulse scenarios beyond single-event surge testing.
SMBJ12CAHM3_A/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:
- 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/H FAQ
1.How can I place an order for SMBJ12CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHM3_A/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 SMBJ12CAHM3_A/H reliable?
The price and inventory of SMBJ12CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHM3_A/H?
SMBJ12CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHM3_A/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 SMBJ12CAHM3_A/H?
For technical support, including SMBJ12CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ12CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHM3_A/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 SMBJ12CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHM3_A/H?
All SMBJ12CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHM3_A/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 SMBJ12CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ12CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHM3_A/H Tags
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