IC 741 And IC 741 pin diagram
Table of Contents
IC 741, pin diagram, Characteristics
An Operational Amplifier is a High-gain, DC-coupled electronic voltage Amplifier that Typically has a Single-ended output and differential input. An op amp Generates an output potential in this Configuration that is Typically 100,000 times greater than the difference in potential between its input Terminals.
The IC produced since 1966 by several Manufactures is a widely used general purpose Operational Amplifier. Figure shows that equivalent circuit of the 741 op-amp.
Most Commonly available and used op amp IC is IC 741.
IC 741 pin diagram
- This is a small chip. It comprises eight pins. 2, 3 and 6 numbered pins are most significant.
- Pin 2 is inverting terminal.
- Pin 3 is non-inverting terminal.
- Pin 6 is output terminal.
Mathematical operations like addition, subtraction, division, multiplication, integration, differentiation, etc. are mostly performed by IC 741 in real time. Differential input, gain, and push-pull output are three of the three stages in the IC 741. As “offset null” or “balance” terminals, pins 1 and 5 are used.
Op-amps are merely differential amplifiers. There should be no voltage at the output terminal when the same voltage is applied to the inverting terminal (Pin 2) and the non-inverting terminal (Pin 3). (Pin 6). An ideal situation would be this. Even when the voltage applied at pins 2 and 3 is exactly equal, practically speaking, a small voltage (called an offset voltage) always appears at pin 6. Because we are unable to perfectly match the biassing resistance values and transistor parameters for the differential amplifier, offset voltage appears at the output.
However, if we use the offset voltage to balance the output offset voltage on the inputs, we can still make the output voltage exactly zero. This voltage is referred to as the input offset.
To lessen the mismatches in the IC 741, we can add some external circuitries. These circuits maintain the offset voltage’s balance. For the purpose of allowing us to add external circuits to balance offset voltages, IC 741 has two terminals (Pin 1 and Pin 5) at the input stage. Typically, a potentiometer with its slider connected to the negative supply is needed for offset null adjustment.
Pin configuration of ic 741
- Pin 1 is balance pin. (offset null)
- Pin 2 is inverting input
- Pin 3 is non Inverting input
- Pin 4 is negative power supply pin
- Pin 5 is balance pin. (offset null)
- Pin 6 is output pin
- Pin 7 is positive power supply pin
- Pin 8 does not have any connection
The table below lists the typical characteristics of a 741 IC.
|Parameters||Typical Range||Ideal Value|
|Open Loop Gain(A)||105 to 108||∝|
|Input Resistance(Ri)||105 to 1013||∝|
|Output Resistance(Ro)||10 to 100||0|