I need to replace a shorted TL750L05 +5V voltage regulator with a new one. The problem is I can not easily find a replacement part that has the same features. I found the LM2931M-5.0 but is rated at 100mA max output current instead of 150mA of the original TL750L05. How bad it would be for my smps (the regulator is used in the secondary circuit of the switched mode power supply as an output voltage) and how long it will last ?
It depends on what the actual load is. If the load really draws most of the 150 mA available from the existing regulator, then you can't replace it with a 100 mA regulator. If the load only draws 100 mA or less, then a 100 mA regulator is fine.
I just looked and the TL750L05 is a linear regulator, as the name hints. It is not a SMPS (switch mode power supply). However, the answer about a replacement is the same. Either way, you have to make sure any replacement can provide the current that the load needs. You have to start with finding what that is.