![]() ![]() These values are essential for a bipolar and are one of the first criteria for its selection. For example, group “C”, according to the hFE U classification, starts at 420 and ends at 800. The BC547 has a fairly large current amplification factor (hFE). Usually, the tests are performed at an ambient temperature of 77 degrees Fahrenheit (25 degrees Celsius) or less. A separate column (test condition) indicates the values at which the manufacturer tested the device in these characteristics. The device manufacturer specifies them right after the description of the limit values. Now let’s look at the electrical parameters of the BC547. The following is a complete list of BC547 operating limits taken from Fairchild Semiconductor’s datasheet. The addition “max”, in the parameter limits, indicates the maximum values, but sometimes it is omitted from the description. This value is quite consistent with, and interrelated to, IC(max) and is 500 mW or half a watt for the entire group.
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