I am using using a PNP transistor in one of my application to switch on and off the boost convertor. My requirement for collector current is 500mA.
My question is does it matter if I use 500mA/600mA/800mA/1A/1.5A collector current rated transistor ? Because using one with slightly higher value will give some tolerance so I am thinking to go for 1A. My concern is mainly voltage drop across transistor(emitter to collector).I am operating transistor at 3.3 volt so I can not afford high voltage drop across transistor. So does it even matter ?
NOTE: assume enough base current is provided according to gain.
Another thing I don't understand in datasheet while choosing transistor is power dissipation. How one can filter that parameter for application. For example if I have 2 transistor of same rating with only difference is one have power dissipation of 250mW and other 500mW.
Any explanations or pointers will do. I am just trying to understand different parameters of transistor to choose most optimum one. Thank you.