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ULN2003 and ULN2003A

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xiaobai00 said:
are they operating at same voltage or different? one with A is 12 or 5v?

As far as I know the "A" suffix just means it is in a standard DIP plastic package.
There is also a version with an "L" suffix to mean surface mounted SOIC.
 
hi,

Ref attachment.
 
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xiaobai00 said:
are they operating at same voltage or different? one with A is 12 or 5v?

ULN 2003A Darlington arrays doesn't need any voltage.

To operate a transistor the +VDD voltage path is coming through the load - through collector - & emitter through ground.There is no +VDD pin in it.

I think you mean the signal input voltage?

But the MAX current can handle to each channel will be very important.It can supports to MAX 50V load per channel.
 
er.. what i mean is ULN 2003A is operating at 12V or standard TTL logic level, +5V? I just want a straight answer, thanks.
 
xiaobai00 said:
er.. what i mean is ULN 2003A is operating at 12V or standard TTL logic level, +5V? I just want a straight answer, thanks.

The table I posted tells you what the ULN2003A accepts as inputs, its a General Purpose ALL types.

OR do you mean what can it switch??
 
xiaobai00 said:
er.. what i mean is ULN 2003A is operating at 12V or standard TTL logic level, +5V? I just want a straight answer, thanks.
They are just darlington transistors. They do not have an operating voltage. They can drive a load with a supply voltage up to 50V.

Look at the datasheet. The ULN2003A has a series 2.7k input resistor so it can be driven from 5V TTL or from 5V to 15V Cmos signals.
 
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