Hi,
I am trying to build an H-bridge. I got a diagram with two TIP125 Darlington transistors and two TIP120's.
I cannot get my hands on either of these components. What can I replace them with?
Thanks, Adriaan
Farnell-in-one (a big distributor in the UK) has them but I don't know if they export and there might be a minimum order value?
..try also cross ref database...
This says the TIP125=TIP126=TIP127 which may not be helpful unless you look up the TIP127....
TIP127 =
2N6035 2SB673 TIP127 2N6040 2N6041 2N6042 2SB791 ECG262 2SB791 ECG262 2SB791 ECG262Suggest you repeat this for the TIP120
Because you're using these for a switch, a darlington is not the best choice. Darlingtons have a minimum V drop of a volt or so, which causes a lot of power to be wasted in the power transistors. You should use two separate transistors, with the collector of the first or driver tranaistor connectred to the supply, not to the collector of the second or output transistor. You then use a current limiting resistor from the emitter of the driver to the base of the output transistor.
Another alternative is to use power MOSFETs which have very low on resistance. This allows a very high current with a minimum of heatsinking.
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