SUNMATE - common parameters of rectifier diode — SUNMATE

SUNMATE - common parameters of rectifier diode

(1) Average rectified current if: refers to the average forward current allowed by the diode during long-term operation. The current is determined by the junction area and heat dissipation conditions of PN junction. When using, it should be noted that the average current through the diode should not be greater than this value, and the heat dissipation conditions should be met.

(2) Reverse working voltage VR: refers to the reverse voltage allowed to be applied at both ends of the diode. If it is greater than this value, the reverse current (IR) increases sharply, and the unidirectional conductivity of the diode is damaged, resulting in reverse breakdown. Generally, one half of the reverse breakdown voltage (VB) is taken as (VR).

(3) Reverse current IR: it is the reverse current allowed to flow through the diode under the reverse working voltage. This parameter reflects the unidirectional conductivity of the diode. Therefore, the smaller the current value, the better the quality of the diode.

(4) Breakdown voltage VR: refers to the voltage value at the sharp bending point of the diode reverse volt ampere characteristic curve. When the reverse is soft, it refers to the voltage value under the given reverse leakage current.

(5) Operating frequency FM: it is the operating frequency of the diode under normal conditions. It is mainly determined by the junction capacitance and diffusion capacitance of PN junction. If the working frequency exceeds FM, the unidirectional conductivity of diode will not be well reflected.

(6) Reverse recovery time tre: refers to the reverse recovery time under the specified load, forward current and reverse transient voltage.

(7) Zero bias capacitance Co: refers to the sum of diffusion capacitance and junction capacitance when the voltage at both ends of the diode is zero. It is worth noting that due to the limitation of manufacturing process, even the parameters of the same type of diode are very discrete. The parameters given in the manual are often a range. If the test conditions change, the corresponding parameters will also change.