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Taiwan Semiconductor Corporation SMBJ120CA
- Part No.:
- SMBJ120CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CA.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,170
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Product details
Overview
SMBJ120CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 120 V working stand-off voltage (VWM), 214 V maximum clamping voltage (VC@IPP) at 2.9 A peak impulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive infotainment power supplies and industrial I/O modules.
For engineers reviewing the SMBJ120CA datasheet, SMBJ120CA pinout, SMBJ120CA application, or SMBJ120CA equivalent, key selection criteria include bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package thermal performance (RθJA = 55°C/W), and leakage current ≤1 µA at 120 V.
Technical Context
The SMBJ120CA implements a planar passivated silicon junction optimized for fast transient suppression in both polarities. Its breakdown voltage (VBR) is specified as 133–163 V at 1 mA test current, with symmetrical forward and reverse conduction characteristics due to its bipolar construction.
Thermal design relies on low junction-to-ambient resistance (55°C/W) and a 150°C maximum junction temperature, enabling operation in ambient temperatures up to +125°C when derated per Fig.2. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
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 / 163 V @ 1 mA - Ensures reliable turn-on above normal operating voltage with margin against tolerance drift |
| VC@IPP | 214 V @ 2.9 A (10/1000 µs) - Limits downstream voltage stress during ISO 7637-2 Pulse 1 transients |
| PPK | 600 W - Sustains single high-energy surges common in 12 V/24 V automotive and industrial systems |
| ID@VWM | ≤1 µA - Minimizes standby power loss in always-on circuits such as CAN bus nodes or sensor interfaces |
| RθJA | 55 °C/W - Enables thermal management on standard 1 oz copper PCBs without heatsinking in most applications |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (reversible) | Bidirectional surge path | Either terminal serves as anode or cathode depending on transient polarity - no polarity marking required |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure, critical for automotive under-hood reliability |
| Response time <1.0 ps | Clamps ESD events before IC input structures experience damage - faster than typical system-level ESD waveforms |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity testing |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained industrial and automotive programs |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V battery line in vehicle infotainment head unit exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed upstream of DC-DC converter input to clamp ISO 7637-2 Pulse 5a/b surges. Use Value: Clamps to 214 V while absorbing 600 W peak energy - prevents overvoltage failure of 36 V-rated input stages. |
Use Scenario: 24 V digital input channel on programmable logic controller subject to field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: SMBJ120CA shunts transients across optocoupler input to protect microcontroller GPIO pins. Use Value: Sub-1 µA leakage at 24 V ensures minimal false triggering; 2.9 A IPP handles 2 A relay coil flyback currents. |
| LED Driver Overvoltage Clamp | RS-485 Transceiver Bus Protection |
Use Scenario: Constant-current LED driver in streetlight fixture subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Placed across bulk capacitor to limit voltage rise during 10/1000 µs line surges. Use Value: 214 V clamping voltage stays below 250 V rated electrolytic capacitor WV, extending service life. |
Use Scenario: RS-485 communication port in building automation node connected to long outdoor cables. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pair (A/B) referenced to ground to suppress common-mode transients. Use Value: Symmetrical clamping ensures equal protection for both data lines; DO-214AA footprint fits tight board spacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Unidirectional; VF = 5.0 V @ 50 A; requires correct polarity placement | Only suitable where circuit polarity is fixed and reverse conduction must be blocked | Select SMBJ120A only if unidirectional blocking is required - otherwise SMBJ120CA provides simpler layout and polarity-agnostic protection |
| SAC120 | Same VWM/VBR/VC specs; higher RθJA (60°C/W); different marking code (YF) | Approved for same ISO 7637-2 pulses but validated under alternate qualification flow | SAC120 is a second-source option with identical electrical behavior - verify tape-and-reel packaging compatibility before substitution |
Compared with SMBJ120A and SAC120, the SMBJ120CA offers polarity-insensitive installation and matches the thermal performance of SAC120 while maintaining Taiwan Semiconductor's qualification for automotive-grade surge immunity - making it optimal for space-constrained, high-reliability bidirectional protection.
Availability
SMBJ120CA is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and LED lighting applications requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMBJ120CA 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMBJ series was developed specifically for robust, surface-mount transient suppression in automotive and industrial environments - emphasizing fast response, low leakage, and standardized DO-214AA packaging for automated assembly.
FAQ
What is the clamping voltage of SMBJ120CA under a 10/1000 µs surge?
The SMBJ120CA has a maximum clamping voltage (VC) of 214 V when subjected to a 2.9 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream components remain within safe operating voltage margins.
Is SMBJ120CA unidirectional or bidirectional?
SMBJ120CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping in both polarities, eliminating the need for polarity-aware placement on PCBs and simplifying protection design for AC-coupled or floating signal lines - unlike the unidirectional SMBJ120A variant.
Does SMBJ120CA meet automotive surge immunity standards?
Yes, SMBJ120CA meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 600 W peak power rating, 214 V clamping, and fast <1.0 ps response enable compliance with OEM-level transient immunity test plans for 12 V and 24 V vehicle networks.
What is the maximum junction temperature for SMBJ120CA?
The SMBJ120CA has a maximum junction temperature (TJ) of +150°C, with a storage temperature range of –55°C to +150°C. Derating begins above TA = 25°C per Figure 2 in the datasheet, and its 55°C/W junction-to-ambient thermal resistance allows reliable operation up to +125°C ambient when mounted on standard FR-4 with adequate copper area.
What package does SMBJ120CA use, and is it compatible with automated assembly?
SMBJ120CA uses the DO-214AA (SMB) surface-mount package, with matte tin-plated leads compliant with J-STD-002 solderability standards. Its standardized footprint and glass passivated junction make it fully compatible with high-speed pick-and-place equipment and reflow soldering profiles - confirmed by Taiwan Semiconductor's "ideal for automated placement" feature statement.
SMBJ120CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- 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)
SMBJ120CA FAQ
1.How can I place an order for SMBJ120CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CA 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 SMBJ120CA reliable?
The price and inventory of SMBJ120CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CA is usually 5 days.
3.What payment methods are accepted for SMBJ120CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CA?
SMBJ120CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CA 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 SMBJ120CA?
For technical support, including SMBJ120CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CA requirements.
6.How does Aetrix verify that SMBJ120CA is sourced from the original manufacturer or authorized distributors?
All SMBJ120CA 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 SMBJ120CA meets industry standards.
7.What is the process for return or replacement of SMBJ120CA?
All SMBJ120CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CA, 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 SMBJ120CA part is unused and in its original packaging.
Return procedure for SMBJ120CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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