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What uses a 5V DC?
A 5V output is most commonly used when the end application needs powering via a USB connector, for example a mini/micro B or Type-C plug. Or, if space is at a premium, the DC cable and USB plug can be removed altogether and replaced with a female socket on the case like on phone chargers.
Is 5 volts DC dangerous?
If it is current or power capacity, we can generate 4000 Amp at 5 V. This is about 20 KW in DC !! When it comes to shock to humans, it is safe and we can say not strong enough to cause a sensation of shock.
What dc voltage is safe?
You point out in your letter that some consensus standards consider live parts operating between 50 and 60 volts, DC, to be non-hazardous under certain circumstances. However, OSHA considers all voltages of 50 volts or above to be hazardous.
When did 5V become the supply of choice for digital circuits?
Thus began a long period of relative stability during which 5V was the supply of choice for digital circuits (excepting ECL). This was fine from about 1965 to 2000 or so, but gradually it became less and less optimal as devices shrunk and power consumption requirements became more important commercially.
Why are 5 volts used in a circuit?
It was designed to use 5 volts because that provided the best combination of noise immunity, power consumption and speed with the existing technology. Naturally, connecting circuits such as sensors and other devices tried to use the same voltage to avoid the need for extra power supplies.
Is there going to be a 5v USB charger?
Choosing 5V for USB (and thence as a charger/power supply standard) means we’ll continue to see 5V for many more years, if not decades.
What kind of voltage regulator was needed for 5V power rails?
The specification for the 5V power rails for early logic supplies was quite tight (basically +/- 5%) and the voltage regulators required would need to keep in-specification despite things warming up. A regulator therefore needed a fairly stable voltage reference and I suspect this was provided by zener diodes.