1.5SMC300CA Circuit Protection

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1.5SMC300CA is a bi-directional TVS diode designed to protect signal lines from electrical over-stress due to electrostatic discharge (ESD), electrical fast transients (EFT), surge, or inductive load switching events. This device is primarily designed to protect sensitive data and equipment against high overvoltage transients such as those found in the telecommunications and automotive industries. It is available in a variety of surface mount devices and is available at a range of voltages from 30 volts to 500 volts.

The 1.5SMC300CA is designed to low pass filter high frequency transient events and clamp negative transients in such a way so as to avoid damage to sensitive electronic components. It can also absorb positive energy during a transient event and can provide fast clamping action and low capacitance. The device can tolerate up to 100 volts of static overvoltage and up to 10 amps of surge current for 5 millisecond pulses. It also has an operating temperature range of -40°C to +105°C and a proven stability under rigorous environmental conditions.

The working principle of the 1.5SMC300CA is relatively simple. When a voltage transient higher than the device\'s clamping voltage is applied, the diode operates as a low resistance Shunt, allowing current to flow through the diode from the line to ground. The voltage across the diode is clamped to the device\'s clamping voltage. This voltage is typically about two times the Zener breakdown voltage, for instance, at 30 volts the clamping voltage would be about 60 volts. This ensures that the overvoltage events are safely dissipated and do not reach the electronic components.

The 1.5SMC300CA is typically used in applications where overvoltage and ESD protection is required such as cellular phone base stations, automobiles, telecom systems, networking, satellite systems and optical networking systems. In automobiles it can provide protection from electrical overstress or EOS in the power train, engine and lighting systems. Additionally, in medical applications it can provide surge protection to sensitive equipment such as ultrasound imaging systems. The device is also used in portable computer systems, cellular base stations and many other consumer electronics equipment.

In summary, the 1.5SMC300CA is a bi-directional TVS diode designed to protect signal lines from electrical over-stress due to electrostatic discharge (ESD), electrical fast transients (EFT), surge, or inductive load switching events. It works by acting as a low resistance shun to allow current to flow through the device from the line to ground, thereby clamping the voltage across the diode to the device\'s clamping voltage. This device is ideal for use in applications requiring ESD, EFT, and surge protection such as cellular phones, automotive systems, medical equipment, and consumer electronics equipment.

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