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uln2003 is a buffer, meant to sink 500mA per buffer.
the uln2003 can be operated with a low power cmos input.
the catch is its a barrier which manges higher loads such as stepper motors, set of relays etc, without harming the input
what else do u want to know?
the controllers such as 8051 there are current limiters for every port, limiting to around 10 to 20mA, before the port is opened
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