SMBJ12A

The SMBJ12A is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., 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 SMBJ12A has a breakdown voltage of approximately 12 volts, making it suitable for clamping voltage spikes that exceed this threshold while allowing normal operation below it.

2. Power Dissipation: The device is capable of handling a peak power dissipation of up to 600 watts, which allows it to absorb significant energy from transient events without failing.

3. Package Type: The SMBJ12A is housed in a DO-214AA (SMB) package, which is a surface-mount device (SMD) that provides a compact footprint for easy integration into circuit boards. The package is designed for efficient thermal management, ensuring that the device can operate effectively even under high-stress conditions.

4. Response Time: The SMBJ12A features a fast response time, typically in the nanosecond range, which is crucial for protecting sensitive components from fast transients.

5. Clamping Voltage: The clamping voltage is specified at a certain peak pulse current, ensuring that the device will limit the voltage to a safe level during transient events.

6. Operating Temperature Range: The SMBJ12A is designed to operate over a wide temperature range, typically from -55°C to +150°C, making it suitable for various environmental conditions.

7. Low Leakage Current: The device exhibits low leakage current under normal operating conditions, which helps to maintain the efficiency of the circuit it protects.

8. Applications: Common applications for the SMBJ12A include ESD protection, surge protection in power lines, and safeguarding sensitive components in automotive and industrial electronics.

Electrical Characteristics:

• Reverse Stand-off Voltage (V_R): 12V
• Breakdown Voltage (V_BR): Typically around 13.3V
• Clamping Voltage (V_C): Specified at a certain peak pulse current (e.g., 20A)
• Peak Pulse Power (P_PP): 600W (for 8/20μs waveform)
• Capacitance: Low capacitance values, ensuring minimal impact on signal integrity in high-speed applications.

Conclusion:

The SMBJ12A from Littelfuse Inc. is a robust and reliable transient voltage suppressor that provides essential protection for electronic circuits against voltage spikes. Its combination of high power handling, fast response time, and compact packaging makes it an ideal choice for a wide range of applications where overvoltage protection is necessary.