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Taiwan Semiconductor Corporation SMBJ120CH
- Part No.:
- SMBJ120CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CH.pdf
- Description:
- 600W, 148V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,395
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Product details
Overview
SMBJ120CH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 120 V working stand-off voltage (VWM), 133–163 V breakdown voltage (VBR), 214 V maximum clamping voltage (VC) at 2.9 A peak impulse current, and 600 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SMBJ120CH datasheet, SMBJ120CH pinout, SMBJ120CH application, or SMBJ120CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification, low leakage (<1 µA above 10 V), and compatibility with automated SMT placement on 12 V–48 V DC systems.
Technical Context
The SMBJ120CH is a single-die, glass-passivated junction TVS diode optimized for fast response (<1.0 ps) to ESD and electrical fast transients. Its unidirectional configuration provides reverse-biased surge suppression while allowing forward conduction up to 3.5 V at 50 A - consistent with SMBJ100H–SMBJ170H device family specifications.
Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W ratings, enabling reliable operation up to TJ = +150 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 requirements for reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 133 V / 163 V @ 1 mA - ensures predictable turn-on threshold across production lot |
| VC @ IPP | 214 V @ 2.9 A - limits downstream voltage stress during 10/1000 µs surge events |
| PPK | 600 W - sustains high-energy transients without thermal runaway |
| ID @ VWM | <1 µA - negligible standby leakage in battery-backed or low-power circuits |
| TJ max | +150 °C - supports under-hood automotive and industrial ambient environments |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline compatible with IPC-7351B footprint |
Pinout & Package
DO-214AA (SMB) package with cathode band marking; two-terminal unidirectional configuration. Matte tin-plated leads meet J-STD-002 solderability requirements. Polarity is marked on the cathode end of the molded body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connects to system ground or low-side return in unidirectional clamp topology |
| Cathode | Reverse-biased surge input | Connects to protected line (e.g., 12 V rail); clamps to anode when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications requiring zero defect reliability |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Guarantees immunity to load dump (Pulse 5a/b), coupled transients (Pulse 1/2a/2b), and EFT (Pulse 3a/3b) |
| Fast response time <1.0 ps | Clamps before sensitive ICs experience overvoltage damage during nanosecond-scale ESD events |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for green manufacturing and end-of-life processing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp reverse surges to ≤214 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a (load dump). | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from EFT and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) clamping device mounted at connector entry point. Use Value: Maintains signal integrity by limiting transient-induced offset drift and ADC saturation in sub-µA bias networks. |
| LED Driver Overvoltage Protection | DC-DC Converter Input Stage Protection |
Use Scenario: Safeguarding constant-current LED drivers against inductive kickback from relay or solenoid switching. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across driver input terminals to absorb 600 W spikes. Use Value: Extends driver lifetime by preventing gate oxide rupture in MOSFET controllers during repetitive 10/1000 µs surges. | Use Scenario: Front-end protection for buck/boost converters in telecom power supplies exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge limiter upstream of input filter capacitors and controller ICs. Use Value: Enables robust 600 W peak power handling without derating at +85 °C ambient, supporting EN 61000-4-5 Level 4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHE3/52 (Vishay) | Bidirectional variant (CH suffix indicates unidirectional; AHE3 denotes bidirectional); VBR = 133–147 V; VC = 193 V @ 3.2 A | Supports AC-coupled or floating-line protection where polarity reversal may occur | Select SMBJ120AHE3/52 only if bipolar clamping is required; SMBJ120CH remains optimal for DC rail grounding topologies. |
| P6SMB120A (ON Semiconductor) | Same DO-214AA package; VBR = 133–147 V; VC = 193 V @ 3.2 A; AEC-Q101 not explicitly stated in latest datasheet revision | Lacks formal AEC-Q101 certification - suitable for industrial but not automotive safety-critical use | Choose P6SMB120A for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
Compared with SMBJ120AHE3/52 and P6SMB120A, the SMBJ120CH offers verified AEC-Q101 qualification, tighter VBR tolerance (133–163 V vs. 133–147 V), and higher clamping voltage margin for 120 V nominal systems - making it preferred for automotive-grade 24 V power distribution networks.
Availability
SMBJ120CH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver overvoltage mitigation requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMBJ120CH 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-compliant production lines.
The SMBJH series was developed specifically for automotive and industrial transient suppression, emphasizing high PPK, low leakage, and robust thermal performance in standard SMB packages for seamless integration into existing PCB layouts.
FAQ
What is the clamping voltage of SMBJ120CH under a 10/1000 µs surge?
The SMBJ120CH has a maximum clamping voltage (VC) of 214 V when subjected to its rated peak impulse current of 2.9 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream circuitry remains within safe voltage limits during standardized surge events.
Is SMBJ120CH AEC-Q101 qualified?
Yes, SMBJ120CH is explicitly AEC-Q101 qualified as confirmed in the official Taiwan Semiconductor SMBJH Series datasheet (Version A2102). This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and ESD - validating its suitability for automotive powertrain and body electronics applications.
Does SMBJ120CH support bidirectional surge protection?
No, SMBJ120CH is a unidirectional TVS diode. Its CH suffix denotes unidirectional configuration. For bidirectional protection, Taiwan Semiconductor offers the SMBJ120AH variant (with AH suffix), which provides symmetrical clamping in both polarities and shares the same VWM and VC ratings.
What is the maximum junction temperature rating for SMBJ120CH?
The SMBJ120CH has a maximum junction temperature (TJ) rating of +150 °C, enabling reliable operation in under-hood automotive environments and high-ambient industrial enclosures. This rating is supported by its RθJC = 10 °C/W and RθJA = 55 °C/W thermal resistances under standard PCB mounting conditions.
How does SMBJ120CH compare to SMBJ120AHE3/52 in terms of polarity and application scope?
SMBJ120CH is unidirectional and intended for DC rail-to-ground clamping, whereas SMBJ120AHE3/52 is bidirectional and suited for AC or floating-line protection. The SMBJ120CH's lower leakage (<1 µA) and AEC-Q101 qualification make it preferable for automotive 12 V/24 V systems where polarity is fixed and reliability is critical.
SMBJ120CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ120CH FAQ
1.How can I place an order for SMBJ120CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CH 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 SMBJ120CH reliable?
The price and inventory of SMBJ120CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CH is usually 5 days.
3.What payment methods are accepted for SMBJ120CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CH?
SMBJ120CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CH 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 SMBJ120CH?
For technical support, including SMBJ120CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CH requirements.
6.How does Aetrix verify that SMBJ120CH is sourced from the original manufacturer or authorized distributors?
All SMBJ120CH 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 SMBJ120CH meets industry standards.
7.What is the process for return or replacement of SMBJ120CH?
All SMBJ120CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CH, 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 SMBJ120CH part is unused and in its original packaging.
Return procedure for SMBJ120CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CH Tags
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