UFR7140

The UFR7140 is a single-phase rectifier diode belonging to a series of fast recovery rectifier diodes. It consists of a single chip of silicon wafer designed for use in data communications and power conversion applications. The main application fields of the UFR7140 are power factor correction, active power filtering, dc/dc conversion, high frequency rectification and protection circuits.

Operating Principles

The UFR7140 diode operates on the principle of formation of a depletion layer between the N-doped and P-doped junctions, when the diode is forward biased. This depletion layer inhibits the current flow and hence acts as a barrier to the electric field between the holes and electrons. When the voltage across the diode reaches the peak value, current starts flowing through the diode by the avalanche breakdown process. Similarly, when the voltage is negative, the depletion layer increases and no current can flow through the diode. This holds until the voltage is brought back to the peak value.

This fast recovery rectifier diode has a fast turn-off rate. It can dissipate larger power per unit area compared to standard rectifier diode owing to its ultra-low forward voltage drop. It has minimum reverse recovery time and low reverse leakage current.

Characteristics of the UFR7140

The main characteristics of the UFR7140 fast recovery rectifier diode include a forward voltage drop of 0.7V, a reverse recovery time as fast as 0.5µs, a reverse leakage current as low as 1µA, a maximum average forward current of 1.0A and a maximum surge forward current of 4A. The forward surge current is basically determined by the power dissipation limit of the device.

Power Factor Correction

The UFR7140 is a common choice for power factor correction (PFC) applications. The device reduces the power factor and increases efficiency by eliminating the power ripples and thus improving the power supply quality. By providing a fast turn-off time, this rectifier diode helps to restart a motor quickly and reduce its noise and current harmonics.

The UFR7140 is typically used in boost or bridgeless PFC circuit architectures, where these diodes provide a fast and efficient charging or discharging of an input capacitor. The device helps to reduce the voltage spikes generated when a large inductor is connected to the circuit.

High Frequency Rectification

The UFR7140 is also used in high frequency rectification circuits. These circuits are used to rectify the output of power converters and AC-to-DC power supplies. The device has a wide operational temperature range and is suitable for use in high temperature environments. The device also has a high frequency operation, which makes it suitable for high-speed communication systems.

The UFR7140 diode is also used in data communication networks, where it provides reliable and consistent performance. In these circuits, high frequency data is efficiently converted to digital signals. This rectifier diode is also used in DC-to-DC conversion, where it can provide an efficient and fast switching operation for DC-to-DC conversion.

Conclusion

The UFR7140 fast recovery rectifier diode is a multi-purpose device employed in various applications such as power factor correction, active power filtering, dc/dc conversion, high frequency rectification and protection circuits. The device has a low forward voltage drop and a fast turn-off rate which make it suitable for these applications. The device also has a wide operational temperature range and is able to operate at high frequencies. Thus the UFR7140 diode is an ideal solution for many modern electrical and communication systems.