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Taiwan Semiconductor Corporation SMBJ120
- Part No.:
- SMBJ120
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120.pdf
- Description:
- 600W, 148V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,024
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Product details
Overview
SMBJ120 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 120V working stand-off voltage (VWM), and clamps transients to ≤214V at 2.9A peak impulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b surges.
For engineers reviewing the SMBJ120 datasheet, SMBJ120 pinout, SMBJ120 application, or SMBJ120 equivalent, key selection criteria include its 133–163V breakdown voltage range, <1μA leakage at 120V, 1.0ps response time, and compliance with JESD201 Class 2 whisker resistance and UL 94V-0 flammability.
Technical Context
The SMBJ120 employs a glass-passivated silicon junction optimized for fast clamping of high-energy transients. Its unidirectional configuration provides low forward voltage (VF = 5.0V @ 50A) and supports inductive load switching protection without reverse conduction.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation up to TJ = +150°C. It meets moisture sensitivity level 1 per J-STD-020 and is halogen-free per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 133 V / 163 V - Breakdown occurs within this range at 1 mA test current, defining surge initiation threshold |
| VC @ IPP | 214 V - Clamped voltage across terminals during 2.9 A 10/1000 µs surge, limiting downstream stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform, derated above 25°C ambient |
| ID @ VWM | <1 µA - Leakage current at rated stand-off voltage, ensuring minimal standby power loss |
| Response time | <1.0 ps - Time from transient onset to clamping activation, critical for ESD and EFT immunity |
| TJ max | +150 °C - Maximum junction temperature, supporting operation in under-hood automotive environments |
Pinout & Package
DO-214AA (SMB) surface-mount package with matte tin-plated leads, polarity indicated by cathode band. Weight: 0.090 g. Molding compound complies with UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to protected circuit ground or low-side return path in unidirectional configuration |
| Cathode | Clamping output node | Connected to power rail or signal line being protected; conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps enables suppression of nanosecond-scale ESD and electrical fast transients before IC damage occurs |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching immunity (Pulse 1/2a/2b/3a/3b) |
| J-STD-020 Level 1 | Allows unlimited floor life and reflow without baking, simplifying SMT assembly logistics |
| RoHS & halogen-free | Meets EU environmental directives and IEC 61249-2-21, supporting green manufacturing requirements |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 120V while remaining non-conductive during normal operation. Use Value: Limits peak rail voltage to ≤214V during 600W ISO 7637-2 Pulse 5a events, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to absorb repetitive 10/1000 µs transients induced by relay switching. Use Value: Withstands ≥1000 surges at 2.9A without degradation, maintaining <1 µA leakage to preserve input logic thresholds. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Preventing overvoltage failure in constant-current LED drivers subjected to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: TVS placed at driver output to clamp transients before they reach series-connected LEDs and current-sense resistors. Use Value: Clamps 10/1000 µs surges to 214V with sub-nanosecond response, avoiding latch-up or thermal runaway in GaN-based drivers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD events during board handling or connector mating. IC Role / Device Role / Timing Role: Low-leakage TVS installed at sensor PCB edge connector to shunt ±8kV HBM ESD pulses to ground. Use Value: Sub-1µA leakage at 120V ensures no DC offset error in mV-level sensor signals; 1.0ps response prevents ESD-induced latch-up in ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Narrower VBR range (133–147 V vs. 133–163 V); lower clamping voltage (193 V vs. 214 V) at same IPP | Better suited for tighter voltage margin designs where lower VC reduces stress on downstream components | Select SMBJ120A when clamping voltage headroom is constrained and tighter VBR tolerance is required |
| SMCJ120 | Larger DO-214AB (SMC) package; higher PPK (1500 W); identical VWM/VBR/VC specs | Used where higher surge energy handling is needed and PCB space allows larger footprint | Choose SMCJ120 for applications requiring >600W surge rating, such as heavy-duty industrial motor drives |
Compared with SMBJ120A and SMCJ120, the SMBJ120 offers balanced surge capability in the smallest standard SMB footprint, making it optimal for space-constrained automotive modules and compact industrial sensors where 600W peak power suffices.
Availability
SMBJ120 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and LED lighting applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ120 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJ series was designed specifically for robust, surface-mount transient suppression in harsh environments-emphasizing ISO 7637-2 compliance, high reliability, and automated assembly compatibility.
FAQ
What is the breakdown voltage range for SMBJ120?
The SMBJ120 has a minimum breakdown voltage (VBR) of 133 V and a maximum of 163 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent surge initiation across production lots while accommodating thermal and process variation. The SMBJ120 maintains this specification across its full operating temperature range of −55°C to +150°C.
Is SMBJ120 unidirectional or bidirectional?
SMBJ120 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only during positive overvoltage events on the cathode relative to anode and blocks reverse voltage up to its rated VWM of 120 V. For bidirectional protection, SMBJ120C would be required, with symmetric clamping in both polarities.
What is the clamping voltage of SMBJ120 under a standard 10/1000 µs surge?
The SMBJ120 clamps to a maximum of 214 V when subjected to a 2.9 A peak impulse current with a 10/1000 µs waveform. This value is guaranteed across all units and is measured at TA = 25°C per the manufacturer's test conditions. Derating applies at elevated ambient temperatures per Figure 2 in the datasheet.
Does SMBJ120 meet automotive qualification standards?
Yes, SMBJ120 meets ISO 7637-2 for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (capacitive coupling), making it suitable for 12V and 24V automotive subsystems. It is not AEC-Q200 qualified, but its construction-including glass passivation, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1-supports automotive-grade reliability.
What is the maximum leakage current of SMBJ120 at its working voltage?
The SMBJ120 exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its full working stand-off voltage of 120 V. This ultra-low leakage ensures negligible power loss in always-on circuits and preserves signal integrity in high-impedance sensor interfaces. Measured at TA = 25°C, leakage remains well below 10 µA even at +125°C junction temperature.
SMBJ120 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 214V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ120 FAQ
1.How can I place an order for SMBJ120 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120 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 SMBJ120 reliable?
The price and inventory of SMBJ120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120 is usually 5 days.
3.What payment methods are accepted for SMBJ120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120?
SMBJ120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120 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 SMBJ120?
For technical support, including SMBJ120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120 requirements.
6.How does Aetrix verify that SMBJ120 is sourced from the original manufacturer or authorized distributors?
All SMBJ120 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 SMBJ120 meets industry standards.
7.What is the process for return or replacement of SMBJ120?
All SMBJ120 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120, 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 SMBJ120 part is unused and in its original packaging.
Return procedure for SMBJ120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120 Tags
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