The BC84x family are surface mount versions. The BC54x are modern replacements for the BC10x family. The BC10x family of transistors have a maximum current of only 100mA and are not recommended. The much lower VCE sat will more than compensate for this anyway. Metal can transistors normally have a lower thr J/ amb, so the PN2222 and BC337 possibly have a higher thermal resistance but this should not be a problem, in practice. But the slightly lesser VCEo of the PN2222 and BC337 will not be a problem for this application. J temp max: 200 deg C (probably a misprint and should be DegCW)Īs the impedance of the buzzer is unknown it is not possible to say whether a lesser transitor will be OK. The SL100 is also in a metal can, so probably has a lower thermal resistance junction/ambient than plastic case types. The SL100 is an obsolete low power, high conductance transistor, rather than a small signal, high hFE (current gain) low noise transistor. And a transistor operates as a closed switch under the saturation region.Just a few points for the record. In order to use the transistor as a switch, it must be driven into the saturation region with enough base current. When we apply high enough current at the base of the transistor, it makes a path for the collector current to go through the base towards the emitter. The region responsible for a transistor to work as a switch are Saturation Region and the Cut-off Region. Here I C= collector current, I E = emitter current, and I B = base current. As in the cut-off region, the collector, emitter, and base current are zero, which gives In the cut-off region, both the emitter and collector junctions are reverse biased. The collector, emitter, and base currents are all zero in this region. In this region, transistor works as an open switch or open circuit. Here I C= collector current and I E = emitter current. In other words, the transistor operates as a closed switch or short circuit carrying maximum current which implies: In the saturation region, both the emitter and collector junctions are forward biased. The collector and Emitter currents are maximum in this region. In this region, transistor works like a short circuit. So the collector current increases in proportional to the base current. In the active region, the collector current is β times the base current, i.e., In the active region, the transistor emitter junction is forward biased and the collector junction is reverse biased. The active region lies between the cut-off and saturation regions. Modes of operation of BC547 (a) Active region Thus, it can also be used in RF circuits.īC547 transistor can be used as an alternative to many transistors:īC548, BC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055 and 2N3904 all are BC547 transistor equivalent. The highest transition frequency of BC547 is 300MHz.Max Storage & Operating temperature Should Be: -65 to +150 Centigrade.Minimum & Maximum DC Current Gain (h FE): 110 – 800.Max Collector Dissipation (Pc): 500 milliwatt.Max Collector-Emitter Voltage (V CE): 45V.Specifications and characteristics like Absolute maximum ratings, Block diagram, biasing methods, and package dimensions can be found in the datasheet. You can find detailed information on BC547 in the datasheet given above. Click this link to view the entire DATASHEET of BC547
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