S3KHE3/9AT

S3KHE3/9AT Diodes - Rectifiers - Single

A single phase Silicon Controlled Rectifier, also known as a S3KHE3/9AT, is a rugged, power rectifier device suitable for use in heavy industrial or automotive applications that require full-wave or half-wave current control capabilities. This type of device typically consists of four or more silicon-controlled rectifying junctions, which are connected in reverse-parallel "reverse-blocking" configuration, to form a uni-directional current switch.

The power handled by a S3KHE3/9AT can range from a few milliamperes up to hundreds of amperes, depending on the type of rectifying diode used and the current demands of the application. Common voltage ratings for these devices range from 40V to 600V.

This type of rectifier has many advantages over more traditional rectifiers, such as its ability to rapidly switch on and off, which allows for improved accuracy and control. Additionally, the S3KHE3/9AT is not prone to thermal runaway, due to its high insulation resistance, making it suitable for use in harsh environments. Finally, the device is highly resistant to reverse-voltage spikes, which can lead to damage in other types of rectifiers.

The S3KHE3/9AT\'s basic operating principle is quite simple. It consists of four or more junctions, which are connected in reverse-blocking configuration. A low direct current (DC) voltage is applied across the device, and this turns on the rectifier in a very similar manner to a relay. When the applied voltage reaches a certain magnitude, the rectifier conducts and current is drawn in a unidirectional pattern through the device. This current geometry is also known as a half-wave rectification, which utilizes the entire input wave in one direction. Alternatively, a full-wave rectification can be achieved by connecting two S3KHE3/9AT’s, back to back, forming a center tapped rectifier.

In terms of practical applications, S3KHE3/9ATs are commonly utilized in heavy duty motors and generators, where the device’s rapid switching capabilities are beneficial. These rectifiers are utilized in automotive applications, such as windshield wipers, and in industrial devices, such as driving electric arc welders. Additionally, the device is often used in many power supplies, such as switching power supplies and inverters, due to its high efficiency and resilience to reverse-voltage spikes.

Overall, the S3KHE3/9AT is a rugged and reliable rectifier suitable for a wide range of high-power applications. Its ability to rapidly switch on and off makes it ideal for control systems, while its high insulation resistance and reverse-voltage resistance make it suitable for use in harsh environments. Furthermore, the device’s low voltage and current requirements makes it well suited for use in battery-powered applications.