So you can see that it starts to heat up well even before reaching this limit, already at 60 mA. The BC547 should not be more than 100mA because this value will be the breakdown limit, above which the device will surely burn out. IC (max) is the maximum collector current that can be applied across the collector-emitter pins.For example, the BC547 cannot hold more than 45 volts, so this value is specified as the safe operating voltage that must be applied to the collector load. VCEO – indicates the maximum potential difference applied between the collector-emitter contacts.The manufacturer states the maximum permissible values of the operating parameters at the beginning of the technical description. It usually includes a table of maximum allowable operating parameters and electrical characteristics at which the device operates stably.

During their testing process just before release, I classified them as -7, -8, or -9 based on VBCO and VCEO measurements and noise components.Ī detailed description can be found in the datasheet from the manufacturer. Group “A” will have the smallest gain, and “C” will have the largest gain.īC547, BC548, BC549 are identical transistors created on the same production line. Also, all types of devices are divided into groups of maximum current amplification factor hFE- from A to C. For example, the BC547 differs in the threshold voltages and is between the BC546 and the BC548. The datasheet for the BC547 usually describes similar transistors: BC546, BC548, BC549, and BC550. The figure shows the basic appearance of the device, which will vary slightly depending on the particular brand, but the characteristics and pin assignments remain identical. If you look at the bevel from the front, the purpose of these pins is from left to right: collector, base, emitter. The TO-92 (or TO-226AA) package pinout of the BC547 has three flexible pins for hole mounting. It is currently the current replacement for the older BC107 or BC147, which are included in many developments by Mullard and Philips. It was identical in its technical characteristics but was produced unlike the metal bc107 in a plastic sealed housing TO-92. It was a joint development of the then-popular BC107. BC547 first appeared on the market of electronic radio components in April 1966, thanks to Philips (Holland) and Mullard (UK).

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