Maximum Forward Current
The Maximum Forward Current (IF(max)) is as its name implies the maximum forward current allowed to flow through the device. When the diode is conducting in the forward bias condition, it has a very small "ON" resistance across the PN junction and therefore, power is dissipated across this junction (Ohm´s Law) in the form of heat. Then, exceeding its (IF(max)) value will cause more heat to be generated across the junction and the diode will fail due to thermal overload, usually with destructive consequences. When operating diodes around their maximum current ratings it is always best to provide additional cooling to dissipate the heat produced by the diode.
For instance, our small 1N4148 signal diode has the maximum current rating of around 150mA with a power dissipation of 500mW at 25oC. Then a resistor should be used in series with the diode to limit forward current, (IF(max)) through it to below this value.
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