the functions of each pin of the integrated block UA741CP are: 2 pins are inverting input terminals, 3 pins are noninverting input terminals, 6 pins are output terminals, 7 pins are connected to a positive power supply, 4 pins are connected to a negative power supply (when a dual power supply works or ground (when a single power supply works), 1 pin and 5 pins are offset voltage zeroing terminals, and 8 pins are empty pins without any connection inside.

pins and working instructions of p>uA741I chip: 1 and 5 are bias (zero-setting terminals), 2 is forward input terminal, 3 is reverse input terminal, 4 is grounded, 6 is output, 7 is connected to power supply and 8 is empty.

application analysis

UA741CP is widely used, and it is packaged in 8-pin dual insert or 8-pin cylinder. The working voltage is 22 V, the differential voltage is 3 V, the input voltage is 18 V, and the allowable power consumption is 5mW.

its pins are exactly the same as those of OP7 (ultra-low offset precision operational amplifier), and other operational amplifiers that can be replaced are uA74l, uA79, LM31, LM38, LF356, OP7, op37, max427, etc. Let's explain the performance of uA741 general amplifier, which is not very good, but meets the general requirements.