This is to total newbie question that I can't find an answer to.
I'm using the 1980 National Semiconductors Voltage Regulator Handbook to design a simple regulated 5 volt output power supply for my old tractor. One of the first items in the input part of the circuit, as in most similar circuits, is a diode to help with negative spikes and as a safety feature to guard against reverse battery connection. The specified diode is the 1N4004, but my question is why. The diodes range from 1N4001 to 1N4007 and other than the peak voltage, all the other specs are exactly the same, so why specify one with a 400 volt peak capability rather than just using something like the 1000 volt 1N4007 on everything?
I'm using the 1980 National Semiconductors Voltage Regulator Handbook to design a simple regulated 5 volt output power supply for my old tractor. One of the first items in the input part of the circuit, as in most similar circuits, is a diode to help with negative spikes and as a safety feature to guard against reverse battery connection. The specified diode is the 1N4004, but my question is why. The diodes range from 1N4001 to 1N4007 and other than the peak voltage, all the other specs are exactly the same, so why specify one with a 400 volt peak capability rather than just using something like the 1000 volt 1N4007 on everything?