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Taiwan Semiconductor Corporation SMBJ120CAH
- Part No.:
- SMBJ120CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAH.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,855
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Product details
Overview
SMBJ120CAH from Taiwan Semiconductor is a bidirectional 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), 133–147 V breakdown voltage (VBR), 193 V maximum clamping voltage (VC) at 3.2 A peak impulse current (IPP), and 600 W peak pulse power rating - deployed to protect CAN, LIN, and 12 V/24 V supply lines against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ120CAH datasheet, SMBJ120CAH pinout, SMBJ120CAH application, or SMBJ120CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, sub-1 ps response time, low leakage (<1 µA @ 120 V), and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMBJ120CAH operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both forward and reverse directions due to its bipolar construction. Its thermal design supports 150 °C maximum junction temperature and leverages a 10 °C/W junction-to-case thermal resistance for effective power dissipation during repetitive or single-event surges.
It meets ISO 7637-2 immunity requirements for automotive electronics and complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for lead-free reflow and long-term reliability in harsh ambient conditions without derating.
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 / 147 V @ 1 mA - ensures reliable avalanche initiation within tight tolerance for predictable protection threshold |
| VC @ IPP | 193 V @ 3.2 A (10/1000 µs) - limits downstream voltage stress during surge events to safe levels for 12–24 V systems |
| PPK | 600 W - sustains high-energy transients typical of load dump or inductive switching in automotive ECUs |
| ID @ VWM | <1 µA - minimizes standby power loss and avoids false triggering in high-impedance sensing circuits |
| Response time | <1.0 ps - enables suppression before sensitive ICs experience overvoltage damage |
| TJ max | +150 °C - supports operation in under-hood environments and industrial enclosures without thermal shutdown |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; dual-terminal configuration optimized for PCB space efficiency and thermal relief via copper pour under cathode pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path (bidirectional) | Connected to protected line or ground reference; conducts during negative transients |
| Cathode | Surge return path (bidirectional) | Marked terminal; conducts during positive transients; requires thermal pad for 3 W steady-state dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass-passivated junction | Ensures stable VBR over lifetime and prevents moisture-induced parameter drift in humid environments |
| ISO 7637-2 compliance | Guarantees robustness against standardized automotive electrical transients without external filtering |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally compliant manufacturing |
| Matte tin-plated leads | Enables reliable solder joint formation with lead-free SAC305 paste and eliminates whisker growth risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed control modules (e.g., body controllers, lighting drivers) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp ±100 V transients within 193 V ceiling. Use Value: Prevents latch-up or permanent damage to MCU power supplies and CAN transceivers during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) connected to microcontrollers in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS across signal and ground to suppress EFT bursts without loading precision front-end amplifiers. Use Value: Maintains ADC accuracy by limiting transient-induced offset shifts and avoiding input-stage saturation during IEC 61000-4-4 events. |
| LED Driver Output Protection | DC-DC Converter Input Stage |
Use Scenario: Safeguarding constant-current LED driver outputs from inductive kickback when driving solenoid-based dimming circuits. IC Role / Device Role / Timing Role: Fast-response (sub-1 ps) TVS shunting output terminals to absorb energy from L·di/dt spikes. Use Value: Extends LED module lifespan by preventing overvoltage stress on output MOSFETs and current-sense resistors during switching transitions. | Use Scenario: Protecting buck converter input capacitors and controller ICs from voltage reversals and surge coupling in 48 V telecom or server PSUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed upstream of input EMI filter to divert 600 W pulses before reaching active regulation stage. Use Value: Eliminates need for oversized input bulk capacitors and reduces failure rate of gate drivers subjected to repeated 10/1000 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ120CA | Same DO-214AC (SMA) package; 193 V VC @ 3.2 A but higher RθJA (65 °C/W vs. 55 °C/W) | Lower power density limits use in thermally constrained layouts; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and thermal performance needs |
| Vishay SMA6J120CA | Identical DO-214AC package; same VWM/VBR specs but 500 W PPK rating and no ISO 7637-2 documentation | Insufficient peak power margin for load-dump scenarios; requires additional series impedance for full compliance | Prefer only in non-automotive industrial applications where 600 W surge headroom is not required |
Compared with SMBJ120CAH, SMAJ120CA offers lower thermal performance and lacks automotive qualification, while SMA6J120CA sacrifices 100 W peak power headroom and documented ISO 7637-2 validation - making SMBJ120CAH the optimal choice for AEC-Q101-compliant, thermally demanding 12–24 V system protection.
Availability
SMBJ120CAH is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and LED driver production requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ120CAH 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, and rectifiers with global distribution and AEC-Q101 certification capabilities.
The SMBJH series was developed specifically for high-reliability transient suppression in automotive and industrial environments - emphasizing fast response, low leakage, and robust surge handling in compact SMB packages.
FAQ
What is the clamping voltage of SMBJ120CAH at its rated peak impulse current?
The SMBJ120CAH has a maximum clamping voltage (VC) of 193 V at 3.2 A peak impulse current (IPP) using the standard 10/1000 µs waveform. This value is measured under specified test conditions per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below critical overvoltage thresholds during surge events. The SMBJ120CAH maintains this clamping performance across its full operating temperature range.
Is SMBJ120CAH suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMBJ120CAH is explicitly AEC-Q101 qualified per the manufacturer's documentation and undergoes stress testing including HTGB, HTRB, and temperature cycling. Its compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b further validates its suitability for automotive power net protection. Engineers deploying SMBJ120CAH in body control modules or ADAS subsystems can rely on its certified reliability.
How does the bidirectional configuration of SMBJ120CAH affect its circuit implementation?
The SMBJ120CAH's bidirectional structure allows it to clamp voltage transients of either polarity across the protected line without requiring polarity-aware placement. Unlike unidirectional TVS diodes, it functions identically between anode and cathode - simplifying layout and eliminating orientation errors during automated assembly. This makes SMBJ120CAH ideal for protecting differential buses like CAN or symmetric power rails.
What is the maximum steady-state power dissipation rating for SMBJ120CAH?
SMBJ120CAH has a steady-state power dissipation (PD) rating of 3 W at TA = 25 °C, derated linearly above that ambient temperature per the published thermal derating curve. This rating assumes adequate PCB copper area for heat spreading and reflects the device's ability to handle continuous leakage or low-duty-cycle surges without exceeding its 150 °C maximum junction temperature.
Does SMBJ120CAH meet halogen-free and RoHS requirements?
Yes, SMBJ120CAH is halogen-free per IEC 61249-2-21 and RoHS compliant per EU Directive 2011/65/EU. The molding compound and matte tin plating are fully documented to meet these environmental standards, supporting green manufacturing initiatives and export compliance for global electronics production programs using SMBJ120CAH.
SMBJ120CAH 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:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.2A
- 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)
SMBJ120CAH FAQ
1.How can I place an order for SMBJ120CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAH 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 SMBJ120CAH reliable?
The price and inventory of SMBJ120CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CAH is usually 5 days.
3.What payment methods are accepted for SMBJ120CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAH?
SMBJ120CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAH 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 SMBJ120CAH?
For technical support, including SMBJ120CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAH requirements.
6.How does Aetrix verify that SMBJ120CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAH 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 SMBJ120CAH meets industry standards.
7.What is the process for return or replacement of SMBJ120CAH?
All SMBJ120CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAH, 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 SMBJ120CAH part is unused and in its original packaging.
Return procedure for SMBJ120CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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