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are BT2222 transistors the same as 2N2222


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A transistor is slowly damaged when operating with avalanche breakdown of a reverse-biased emitter-base junction.
The 2N2222 and BT2222 are guaranteed to withstand a reverse emitter-base voltage of 6V or less.

Both transistors probably have the same chip but since the BT2222 is in a tiny case then it will overheat even with a very low power dissipation.

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