Easy H-Bridge on MOSFET IRF7105 transistors

I think I don’t have to explain what is H-Bridge circuit. Well, it is mainly used to drive DC motors that they could be run forward and backward. The circuit is often used in robotics.

Usually, there is a need to build a small, powerful, and with good characteristics H-Bridge. One solution is to use IRF7105 p and n channel MOSFET pair coated in the SO8 SMD case.

As you can see, MOSFETs have good characteristics for driving direct current, like the maximum current is 3.5A for N and 2.3A for the P channel. The main thing here is a voltage drop on transistors, which depends on Rds resistance.

Controlling is very easy. You may use MCU or any manual switch to produce control levels on F1, F2, B1, and B2 wires:

  • F1=0, F2=1, B1=0 and B2=1 – motor turns forward;
  • F1=1, F2=0, B1=1 and B2=0 – motor turns backwards;
  • F1=1, F2=0, B1=0 and B2=1 – motor stop.


  1. Dear i used this circuit but when i put the 5v to f1&b1 or f2&b2, always burn this ic please teach me what is the problem.

  2. Using motor 200ma only

  3. because you create a short circuit between the n and p channel mosfet

  4. Extremely interesting

Leave a Reply