SMLJ20CA-TP Circuit Protection

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TVS - Diodes, also referred to as transient voltage suppressors, are commonly used in electronic circuitry for surge protection from overvoltage, electrostatic discharge and other transient electrical events. The SMLJ20CA-TP is one such diode, designed for transient voltage surge suppression due to lightning, grounding system surges and other transient power line events.

The SMLJ20CA-TP is a unidirectional Thyristor, offering a 6-420V breakdown voltage range, maximum 5mA of on-state current and 256V peak off-state trigger voltage. It features a fast response time, up to 35V/μs, and a high surge current capability of up to 8kA. The diode is also designed to handle transients from switching loads, eliminating the need for external snubbing or additional surge protection components. Combined with its low fighting voltage, the SMLJ20CA-TP is ideal for surge protection in applications with high ESD and electromagnetic interference.

The SMLJ20CA-TP can be used in a variety of applications, including motor control systems, power supply units and telecoms networks. It is particularly useful in motor controllers where it provides surge protection against surges created by the motor’s switching and by unintentional induction of transients from other motors in the environment. It is also useful in telecommunication lines, providing protection against interference from the network.

The working principle of the SMLJ20CA-TP is that it triggers on the presence of a transient voltage. When this occurs, the diode will “trigger” and divert the transient energy to ground. This is achieved by allowing a large current to flow from the anode to the cathode, the direction of which will then reverse depending on the voltage of the transient event. The diode will then divert the transient energy away from the application, thus providing protection.

In conclusion, the SMLJ20CA-TP is a diode designed for transient voltage surge protection across a range of applications. It is unidirectional, offers a wide breakdown voltage range and an excellent peak off-state trigger voltage. It provides a fast response time and high surge current capability, and is suitable for handling transients without the need for additional external snubbing components. It is therefore ideal for providing surge protection in sensitive applications, such as motor control systems and telecoms networks.

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