1V5KE300CA

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TVS diodes are widely used in a variety of applications to protect sensitive devices from voltage transients. The 1V5KE300CA is a small package diode, designed for electrostatic discharge (ESD) and other over-voltage protection. This article will provide an overview of the 1V5KE300CA’s application field and its working principle.

Application Field

The 1V5KE300CA is a uni-directional device intended to protect sensitive electronic circuits from ESD, as well as other overvoltage transients, like lightning-induced surges. The component can dissipate up to 300W of power in an 8/20 micro second ESD pulse, making it suitable for high-end consumer electronics, or other applications that require robust ESD protection. Its small SOD808 package makes it suitable for use on Printed Circuit Boards (PCBs), as well as accessories like USB cables and earphones.

The 1V5KE300CA achieves low clamping voltage without self-heating. It operates over a wide operating temperature, from -40C to +125C, making it suitable for a wide variety of applications, even under extreme conditions. Additionally, the device is RoHS compliant, meaning it is safe to use in applications that require environmental compliance.

Working Principle

The working principle of the 1V5KE300CA is based on the principle of avalanche breakdown. Avalanche breakdown is an electric breakdown phenomenon in solids, which occurs when a strong electric field is applied. In the case of the 1V5KE300CA, the device is subjected to electrostatic discharges, which create a strong electric field within the device. On application of this electric field, the device reaches an avalanche breakdown voltage, at which point it changes state from nonconductive (cutoff) to conductive (saturation). This reduces the overvoltage significantly, thereby protecting the device and the circuitry it is connected to from damage.

The avalanche breakdown of the 1V5KE300CA begins with electrons in the depletion region gaining large amounts of energy from the electric field, converting them into "hot electrons". These electrons then gain kinetic energy from collisions with other electrons and ions in the depletion region, resulting in further scattering. This process continues until the electrons gain sufficient energy to travel across the depletion region and reach the other side, resulting in a small currentflow. This abrupt increase in current flow manifests itself as a voltage drop across the diode, resulting in the device going into saturation.

Once in saturation, the device acts as a low-impedance path, which clamps the voltage spike and reduces it. The device can dissipate this spike without any self-heating, which is a key feature of the 1V5KE300CA. This makes it an efficient and effective protection device, capable of protecting against ESD pulses as well as other voltage transients.

Conclusion

The 1V5KE300CA is a small package diode designed to protect sensitive electronic circuits from ESD and other over-voltage transients. It operates over a wide temperature range and offers RoHS compliance, making it suitable for a wide variety of applications. It works on the principle of avalanche breakdown, which causes the device to go into saturation upon application of a strong electric field. This reduces the overvoltage significantly, thereby protecting the device and the surrounding circuitry from damage.

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