BD439S Overview

The DC current gain is the ratio of the base current to the collector current βdc = Ic/Ib and the DC current gain for this device is 20 @ 10mA 5V.As it features a collector emitter saturation voltage of 800mV, it allows for maximum design flexibility.In VCE saturation, Ic is at its maximum value (saturated), and the vce saturation (Max) is 800mV @ 200mA, 2A.With the emitter base voltage set at 5V, an efficient operation can be achieved.Current rating refers to the maximum current a fuse can carry for an indefinite period without deteriorating substantially, and this device has a 4A current rating.As you can see, the part has a transition frequency of 3MHz.Single BJT transistor is possible for the collector current to fall as low as 4A volts at Single BJT transistors maximum.

BD439S Features

the DC current gain for this device is 20 @ 10mA 5V
a collector emitter saturation voltage of 800mV
the vce saturation(Max) is 800mV @ 200mA, 2A
the emitter base voltage is kept at 5V
the current rating of this device is 4A
a transition frequency of 3MHz

BD439S Applications

There are a lot of ON Semiconductor BD439S applications of single BJT transistors.

• Interface
• Inverter
• Driver
• Muting