The maximum collector current of the transistor is 100mA therefore do not drive load of more than 80mA. Safe Operating Guidelines / Absolute Maximum Ratings:įor safe operation, it is recommended to not use the transistor on its absolute maximum ratings and always stay 20% below. The 100MHz transition frequency also makes it ideal to use in RF circuits under 100MHz. The low noise figure of 4dB makes it ideal to use for audio amplification, preamplification and any electronic signal amplification. It can be used to drive loads under 100mA. If you can’t find these equivalents then you can also try the TO-92 Plastic package equivalents which are BC546, BC547, BC548, BC549, BC560.īC109 is a general-purpose transistor therefore it can be used in any general-purpose applications which fall under its specifications. Other nearest possible substitutes are A158C, BCY65X. BC107 will also work but the only difference is its maximum DC current gain is 450 but in most cases, it will not make a big difference.
The exact match transistor for BC109 is BC108. The transistor is available in three different hFE values which are BC109 hFE value is 200 to 800, BC109B hFE value is 200-450 and BC109C hFE value is 420 to 800. Moreover, the maximum collector dissipation is 300mW and the DC current gain value is from 200 to 800, it also has a good noise figure of 4dB. The maximum collector to emitter voltage of the transistor is 20V which means that the transistor can drive maximum load voltage of 20V. The transistor is designed for general switching and amplification purposes, the maximum collector current is 100mA, however, you will also see some differences in the collector current of the transistor with different manufacturers, some manufacturers have this available in 50mA collector current and some have it available in 100mA, so it is better to first confirm the transistor’s collector current from the supplier you are buying from.
It is the transistor of the BC10x series there are also other transistors in this series which are BC107 and BC108. It is a general-purpose transistor used in commercial and educational circuits.
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