I have looked at a few guides, both on this forum and elsewhere, for choosing a transistor. I know to look for things like HFe and the Collector-emitter voltage, but on the datasheets I am seeing multiple values and don't know which one to look at. In my application I will have a comparator (powerd by 5v) connected to the base of the transistor. The Emitter will be connected to GND and the emitter will be connected to the GND of a 1.5V vibration motor. Based on those voltages, how should I go about looking for a transistor? Also, here is an example of multiple HFE values. For the future, how would I decipher which one to use for calculations?
Edit: I have included a schematic. "U2" is the HC-SR04 Distance Sensor and the Speaker is a 1.5V 50ma vibration motor. That Op-amp and Comparator are the main point of contention. The functionality I am looking for is it to compare the voltage coming from the Distance sensor to some reference voltage i can find later and if it is above that voltage, open up a gate that allows current to flow from the battery to the vibration motor.