IC 741 is an 8-pin Dual In-line Package (DIP) Operational Amplifier.

Pin 2 is the Inverting Input ($-$), Pin 3 is the Non-Inverting Input ($+$).

Pin 4 is connected to negative power supply ($-V_{EE}$) or Ground, and Pin 7 is connected to positive power supply ($+V_{CC}$).

Pin 6 is the Output terminal, and Pins 1 & 5 are used for Offset Null adjustment.

High input impedance at Pin 3 prevents loading down preceding circuit stages.

Provides in-phase signal amplification when input is supplied to Pin 3.

Input bias current flows through Pin 3, causing small offset voltages if uncompensated.

Exceeding maximum input voltage rating at Pin 3 can damage the internal differential transistor pair.

Non-inverting amplifier configurations

Voltage follower / Buffer circuits (high input impedance, unity gain)

Summing amplifiers and differential amplifiers

Pin 1: Offset Null (Used to eliminate output offset voltage)

Pin 2: Inverting Input (180° phase shift between input and output)

Pin 3: Non-Inverting Input (0° phase shift between input and output)

Pin 4: Negative power supply voltage ($-V_{EE}$ or GND)

Pin 5: Offset Null

Pin 6: Output voltage ($V_o$)

Pin 7: Positive power supply voltage ($+V_{CC}$)

Pin 8: No Connection (NC)