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A LM339 is a small scale integrated circuit(SMIC) that contains 4 "Norton"* comparotors on a single chip. The LM339 is not universal as most Operational Amplifiers are. The comparotors on the chip do not amplify with feedback, rather only switch state(+V, Ground) on their output. The benefit to the "locked" behavior is some of the smallest power drains a TTL chip can provide and fast switching speeds. *Norton denotation indicates that the op-amp/comporator operates from a single suply rail(+V,Ground), where normally you would expect to use a dual supply rail for op-amp/comparators(+V,Ground or V_(same thing), -V).

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Q: What is a LM339 Ic?
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Am having 50 lm339 ic in which you found 10 lm339 ic to be faulty ie giving wrong output though our input is write when we replace that faulty lm339 ic with the new lm339 ic our out put get solved?

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