Facebook
Google
GitHub
Linkedin
Hi,
I have simulated the below circuit in LTspice and found that the BJT (Q203) is having less power dissipation (~1mW) then the Q202 BJT.
However, the designer selected a 200mW package for the Q203 and 100mW for the Q202.
Can anyone help me understand what am I missing here? As per my understanding even if I select the same 100mW BJT part for both of them then also the circuit will be okay as per the LTspice simulations. I have attached LTspice simulation file for reference.
In scenario 1, When Motor is ON, Q203 (ON), Q202 (OFF)
In scenario 2, When Motor is OFF Q203 (OFF), Q202 (ON)
Q202 MPN: RN1102
Q203 MPN: RN1402
Thank you.
I have simulated the below circuit in LTspice and found that the BJT (Q203) is having less power dissipation (~1mW) then the Q202 BJT.
However, the designer selected a 200mW package for the Q203 and 100mW for the Q202.
Can anyone help me understand what am I missing here? As per my understanding even if I select the same 100mW BJT part for both of them then also the circuit will be okay as per the LTspice simulations. I have attached LTspice simulation file for reference.
In scenario 1, When Motor is ON, Q203 (ON), Q202 (OFF)
In scenario 2, When Motor is OFF Q203 (OFF), Q202 (ON)
Q202 MPN: RN1102
Q203 MPN: RN1402
Thank you.
