UG18ACT-E3/45

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UG18ACT-E3/45 Application Field and Working Principle

The UG18ACT-E3/45 is a diode array belonging to the Rectifiers category. It is a high-efficiency three-phase bridge rectifier which is typically used as a direct replacement for single-phase bridge rectifiers. The UG18ACT-E3/45 is a unique 3-phase rectifier due to its high current rating and high surge current specifications. It is suitable for a range of applications, such as converter circuits, power supplies and in motor soft starters.

Package Configuration

The UG18ACT-E3/45 is a surface mount rectifier array, measuring only 15.5mm x 4.1mm x 1.77mm in size. It is available in a hermetically sealed ceramic flatpack. The UG18ACT-E3/45 is designed for fast thermal response, so it can be used for high-power applications.

Electrical Characteristics

When operated between -80°C and +175°C, the UG18ACT-E3/45 can accept an operating range of 600V and provided a peak repetitive surge current of 80A. It has a low forward voltage drop of 1.35V at 8A, a low reverse recovery time of 2μs and a significant reverse voltage of 5V. It is able to be connected in series if necessary.

Features

• Low forward voltage drop
• Low reverse recovery time
• High surge forward and reverse currents
• Hermetically sealed
• Compact size
• Fast thermal response
• Rugged

Functioning

The UG18ACT-E3/45 diode array is particularly useful when the source is relatively far away from the load because of its low forward voltage drop. As it is a three-phase bridge rectifier, it can accept higher voltages than a single-phase bridge rectifier. When the mains voltage is applied, the three diodes of the array rectify the input AC current and depending on the polarity of the applied voltage, directs the forward current to the load. During the negative half-cycle, the other three diodes start to conduct and direct the current to the load. This happens in a continuous manner, so the load receives an uninterrupted DC current.

Applications

The UG18ACT-E3/45 diode array is suitable for a range of applications, notably motor soft starters, power supplies, converter circuits, AC/DC rectifiers and DC/DC converters. Additionally, it is suitable for applications in the automotive, industrial and electrical sectors.

Conclusion

The UG18ACT-E3/45 diode array is a high-efficiency three-phase bridge rectifier that is suitable for a range of applications. With a low forward voltage drop and a low reverse recovery time, it is suitable for use in high power applications. Furthermore, its hermetically sealed ceramic flatpack ensures reliable operation and a long life.

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