Maximum Current Input for 555

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Maximum Current Input for 555

Postby miyayoung » Fri Jul 28, 2017 12:46 am

I was looking over a datasheet for the NE555 Timer and I was wondering if the max supply current given under the electrical characteristics page is the max current you can supply to the 555 without damaging the chip.

I ask because it seems like the supply current (for 15V input) is relatively low (10mA) compared to the output current (225mA).

Is the supply current the max current you can put on pin 8 without burning out the chip? If so, why is it so low compared to the output current? If not, how does one find the input current?

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Re: Maximum Current Input for 555

Postby Karlsweldt » Sat Jul 29, 2017 8:40 am

As to the specs on that 555 IC unit, they are the maximum operating limits. The controlled current or voltage, if different, must be handled by an auxiliary switching device.. and can be in excess of 100 amps or 1,000 volts.
The 555 timer itself can control only the specified amount of voltage or current.
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