Choosing right transistor

Thread Starter

FroceMaster

Joined Jan 28, 2012
699
Hi.
Have a setup where i need a transistor.
Need to pull 12-13v dc and around 200mA

Thinking BC635 - BC337 - PN2222ATA or overkill ? TIP48G,
Switching time is defintly not critical.

Have a 5v dc from MicroChip PIC 16F690 to controll with, ( max 20mA)
 

wayneh

Joined Sep 9, 2010
17,496
Hi.
Have a setup where i need a transistor.
Need to pull 12-13v dc and around 200mA

Thinking BC635 - BC337 - PN2222ATA or overkill ? TIP48G,
Switching time is defintly not critical.

Have a 5v dc from MicroChip PIC 16F690 to controll with, ( max 20mA)
If you’re really just switching, as in on and off, I’d use a MOSFET. With 5V you’ll need a logic level version.
 

bertus

Joined Apr 5, 2008
22,270
Hello,

@ArakelTheDragon , when the transistor is not conducting, the power will be 12 Volts X leakage current = almost nothing.
When the transistor is in saturation, the power will be the saturation voltage X 0.2 A = 1.2 X 0.2 = 0.24 Watts.
The transistor may dissipate 1.5 Watts, so that should be OK.

Bertus
 

ArakelTheDragon

Joined Nov 18, 2016
1,362
Hello,

@ArakelTheDragon , when the transistor is not conducting, the power will be 12 Volts X leakage current = almost nothing.
When the transistor is in saturation, the power will be the saturation voltage X 0.2 A = 1.2 X 0.2 = 0.24 Watts.
The transistor may dissipate 1.5 Watts, so that should be OK.

Bertus
I am still sleeping, sorry about that.
 
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