SMBJ18A-TR

The SMBJ18A-TR is a transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed to protect sensitive electronic components from voltage spikes and transients. This device is particularly useful in applications where overvoltage protection is critical, such as in telecommunications, automotive electronics, and consumer electronics.

Key Features:

1. Voltage Rating: The SMBJ18A-TR is rated for a breakdown voltage of approximately 18 volts. This makes it suitable for clamping voltage transients that exceed this threshold, thereby protecting downstream components.

2. Power Dissipation: The device can handle a peak power dissipation of up to 600 watts for a very short duration (typically 8/20 µs pulse). This high power rating allows it to absorb significant energy from voltage spikes without failing.

3. Low Clamping Voltage: The SMBJ18A-TR features a low clamping voltage, which minimizes the voltage that appears across the protected load during a transient event. This characteristic is crucial for safeguarding sensitive components.

4. Package Type: The diode is housed in a DO-214AA (SMB) package, which is a surface-mount device (SMD) that provides a compact footprint. This makes it suitable for high-density circuit board layouts.

5. Temperature Range: The operating temperature range for the SMBJ18A-TR is typically from -55°C to +150°C, allowing it to function reliably in a variety of environmental conditions.

6. Fast Response Time: The device is designed to respond quickly to transient events, ensuring that it can effectively clamp voltage spikes before they can damage sensitive components.

7. Unidirectional Configuration: The SMBJ18A-TR is a unidirectional device, meaning it is designed to protect against positive voltage transients while allowing normal operation of the circuit under standard conditions.

8. Compliance and Standards: The SMBJ18A-TR complies with various industry standards, making it suitable for use in a wide range of applications. It is often used in conjunction with other protective components to create a comprehensive protection scheme.

Applications:

• Telecommunications Equipment: Protecting data lines and power supplies from voltage spikes.
• Automotive Electronics: Safeguarding sensitive circuits from transients caused by load dumps or inductive kickback.
• Consumer Electronics: Providing overvoltage protection for devices such as smartphones, tablets, and home appliances.
• Industrial Equipment: Protecting control circuits and sensors from electrical noise and transients.

Conclusion:

The SMBJ18A-TR from STMicroelectronics is a robust and reliable transient voltage suppressor that offers excellent protection for sensitive electronic components against voltage spikes. Its combination of high power handling, low clamping voltage, and compact packaging makes it an ideal choice for a wide range of applications where overvoltage protection is essential.