What should be noted when selecting fast recovery diodes​?

What should be noted when selecting fast recovery diodes?

(1) Correct selection of packaging form

When selecting the packaging form, it is necessary to consider the advantages and disadvantages of various packaging forms based on the environmental adaptability requirements of the application site, and determine the packaging form of the device to meet the usage requirements while also considering the economy.

⑵ Cannot exceed the maximum rated value of the fast recovery diodes

The maximum rated value of a device is the limit value of the working and environmental conditions under which it can be safely used. Regardless of the harsh working and environmental conditions, devices are not allowed to exceed or momentarily exceed the specified limit values during use. Only when used below this limit value can the device operate reliably and fully utilize its functions. Otherwise, the device may experience parameter degradation, performance degradation, greatly shortened lifespan, and even damage or failure. Therefore, circuit designers should fully consider the electrical conditions (such as current and voltage changes, load changes, signal changes, circuit control adjustments, component equipment changes, etc.) and environmental conditions of the device throughout its entire working life, so that they do not exceed the maximum allowable rated value of the device. In addition, as the parameters of the maximum rated value of the device are interrelated, consideration must be given during design or use.

⑶ Reduced usage

Temperature is an important factor affecting the lifespan of devices. The higher the junction temperature of the device, the greater the probability of failure. Therefore, the junction temperature of the device should be controlled within the allowable range to prevent overheating and failure of the fast recovery diodes.

Derating is an effective measure to prevent device overheating. To improve the reliability of device operation, it is necessary to consider derating the specified parameters of the device. The parameters (derating factor) that require derating during device use include voltage, current, power, operating junction temperature, and ambient temperature. 2、 Typical derating use of a transistor