In this lecture, we are going to learn about the most popular Op-amp IC called IC 741 Op Amp. We will cover the full details of this op-amp IC in very depth and we will try to provide you with the best material available on the internet.
IC 741 Op Amp Basics
IC 741 Op Amp is one of the oldest and one of the most popular Op-amp ICs. It is a high-performance monolithic operation amplifier. It has a wide range of analog applications such as integrator, differentially, summing amplifier, etc.
Features of IC 741
Features of IC 741 op-amp are as follows:
- No frequency compensation is required.
- Short circuit protection
- offset voltage null capability
- Large common mode and differential voltage range
- No latch-ups.
Pin Configuration of 741 op-amp
The Pin Configuration of 741 op-amps in the 8-pin mini DIP package is shown in the below figure.
IC 741 Op Amp is an 8-pin IC in the dual in-line package(DIP).
Pin number 7 is for connecting the positive supply voltage +Vcc while pin number 4 is to be connected to a negative supply voltage. Thus IC 741 needs a dual polarity power supply.
Pin number 2 and 3 are inverting and non-inverting inputs respectively and we get the output voltage at pin number 6.
Pin number 1 and 5 can be used to nullify the offset voltage and pin number 8 is a dummy pin that is not connected anywhere and hence should be left open (unconnected).
Even though the mini DIP is the most popular package, the op-amp IC 741 is available in some other packages too. They are as follows:
Other Package of IC 741 Op Amp:
Also Read: Transfer Characteristics of Differential Amplifier
Characteristics of IC 741 Op Amp
The typical values of different important characteristics are listed in the below table, along with the ideal values of those characteristics.
| Sr. No. | Characteristics | Values for IC 741 | Ideal Value |
|---|---|---|---|
| 1. | Input Resistance Ri | 2 MΩ | ∞ |
| 2. | Output Resistance Ro | 75 Ω | 0 |
| 3. | Voltage Gain Av | 2 x 105 | ∞ |
| 4. | Bandwidth B.W. | 1 MHz | ∞ |
| 5. | CMRR | 90 dB | ∞ |
| 6. | Slew Rate | 0.5 µV/s | ∞ |
| 7. | Input Offset Voltage Vios | 2 mV | 0 |
| 8. | PSRR | 150 µV/V | 0 |
| 9. | Input Bias Current IB | 50 nA | 0 |
| 10. | Input Offset Current Iios | 6 nA | 0 |
Also Read: Ideal Differential Amplifier
IC 741 Applications
some specific applications of the IC 741 op-amp:
- Inverting Amplifier: Uses the op-amp to create an inverted output signal compared to the input signal by connecting the input to the inverting terminal and providing feedback through a resistor.
- Non-Inverting Amplifier: Produces an output that is in phase with the input signal by connecting the input to the non-inverting terminal and using feedback through a resistor network.
- Summing Amplifier: Utilizes multiple input signals and combines them into a single output by applying different weights to each input using resistors in a summing configuration.
- Differential Amplifier: Measures the difference between two input signals, providing an output proportional to the voltage difference between these inputs.
- Integrator: Uses an op-amp along with a capacitor to perform mathematical integration of an input signal, resulting in an output voltage that represents the integral of the input voltage over time.
- Differentiator: Combines an op-amp with a capacitor and a resistor to perform mathematical differentiation of an input signal, producing an output voltage proportional to the rate of change of the input voltage.
- Comparator: Compares two input voltages and provides a high or low output depending on which input is greater, commonly used in threshold detection and digital applications.
- Active Filters: Implements various types of filters (such as low-pass, high-pass, band-pass) using op-amps and capacitors/resistors to filter out specific frequencies from input signals.
- Voltage Follower (Buffer): Acts as a unity gain amplifier, producing an output voltage that directly follows the input voltage, commonly used to isolate input and output impedances.
FAQs
What is IC 741 op-amp?
The number 741 in the name indicates that there are 7 active pins, 4 pins (pin 2,3,4,7) are capable of taking input and 1 pin ( pin 6) is an output pin.
How many pins are there in IC 741?
eight pins
What is the gain of IC 741?
741 op-amp has a typical open loop gain of 200,000 V/V.
Why IC 741 is used?
741 IC is mostly used to amplify signals of varying frequencies ranging from DC to higher radio frequencies.
What is the voltage of IC 741?
The supply-voltage operating range for the 741 is +4.5 volts (minimum) to +18 volts (maximum), and it is specified for operation between +5 and +15 Vdc.
