Precautions for selecting rectifier diodes
What do I need to pay attention to when choosing rectifier DIODES? Diodes are a common semiconductor device, in order to meet the needs of many different areas of application, diodes can be divided into a variety of types, rectifier diodes is one of them. When choosing rectifier diodes, what do you need to pay attention to? Let's take a look together!
The role of rectifier diodes
To ask about what you need to look for when shopping for rectifier diodes, we first need to talk about the role of rectifier diodes.Diodes contain several different types, but they all share one important characteristic, which is that they have a unidirectional conductivity, and the current can only flow in from the positive pole of the diode and out from the negative pole.
Specific to the rectifier diodes, its role is mainly to be able to change the alternating current into pulsating direct current, can be used in a variety of low-frequency half-wave rectifier circuits. In the process of rectifier diodes work, there are many important parameters, but also the main basis for the selection of rectifier diodes.
Maximum leveling current IF
This refers to the maximum forward average current allowed to pass through the rectifier diodes during long-term operation, and this data is determined by the junction area of the PN junction and heat dissipation conditions. When purchasing rectifier diodes, you should ensure that the average current of the diode is not greater than this value, and when designing the product, you also need to pay attention to meet the heat dissipation conditions.
Maximum reverse operating voltage VR
This refers to the rectifier diodes in the highest reverse voltage, if greater than this value, it will lead to a sharp increase in reverse current, destroying the unidirectional conductivity of the diode. In the purchase of rectifier diodes, generally take half of the reverse breakdown voltage VB as VR. (The breakdown voltage VB is the voltage value at the point where the rectifier diode's reverse volt-ampere characteristic curve bends sharply.)
Maximum reverse current IR
This is the reverse current allowed to pass through the rectifier diodes at the highest reverse operating voltage. In the purchase of rectifier diodes, this parameter can directly respond to the diode's unidirectional conductivity of good and bad, the smaller the value of the current, it means that the diode's quality is better.
Maximum operating frequency fm
This refers to the maximum operating frequency of rectifier diodes under normal conditions. When purchasing rectifier diodes, it should be ensured that the operating frequency of the electronic equipment involved never exceeds this value, so as to ensure that the unidirectional conductivity of the diodes.
Reverse recovery time trr
This is the reverse recovery time of the rectifier diodes under the specified load, forward current and maximum reverse transient voltage.In the purchase of rectifier diodes, need to be based on the above parameters, combined with the actual demand for the selection of the corresponding products, to ensure that they can meet the demand, to meet the functionality and safety of the premise, and then go to examine the quality, logistics, supply chain, technical support and other aspects.
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