Introduction to Dual Op Amp IC LM358
LM358 IC is a dual operational amplifier integrated circuit with two Op-Amp powered by a common power supply. It consists of two independent compensated operational amplifiers with low power and high gain frequency.
LM358 is specially designed to operate from a single supply over a wide range of voltage. It is more flexible for low voltage AC and moderate voltage DC applications. LM358 is available in a cheap-sized package so it is widely used in real-life applications including transducer amplifier, DC gain block, active filter, and conventional op-amp circuit design. LM358 IC can handle 3V- 32V DC supply and source up to 20 mA per channel.
In this guide, we will learn about the Dual Op-Amp LM358 basics, characteristics, circuits, working, pins configuration & Applications. You can go through the Op-Amp IC 741 to learn more about the operational amplifier.
LM358 Features and Specification
Depending upon the manufacturer, each product may have a slightly different variation of the components and each has very similar specifications. Some of these components have identical pinout and package sizes to allow for compatibility between different manufacturers.
Some important features and specifications of LM358 IC are as follows:
- Integrated with two operational amplifiers in a single package
- Wider range of power Supply e.
- 3V to 32V in a single power supply
- ±1.5V to ±16V in a Dual power supply
- The large voltage gain is around 100 dB
- Wider bandwidth in 1 MHz
- Low supply current is 700µA
- The output voltage swing is high
- Differential input voltage range is similar to the power supply voltage
- Short circuit protected outputs
- Internally frequency compensated for unity gain
- Input common-mode voltage range includes ground
- Operating ambient temperature range is 0˚C to 70˚C
- Soldering pin temperature is 260 ˚C
- Available packages are TO-99, CDIP, DSBGA, SOIC, PDIP, DSBGA
Pin Configuration
The real image and pinout of the configuration of LM358 IC is shown in the diagram below which has eight pins in total having different individual functions associated with each of them.
- Pin1 and pin8 are the output of the comparator
- Pin2 and pin6 are inverting input.
- Pin3 and pin5 are non-inverting inputs
- Pin4 is the GND terminal
- Pin8 is VCC+/positive supply
All the pins of LM358 IC along with their sequence number are given in the tabular diagram shown below.
LM358 Operating Principle & Working
In LM358, Pin 8 is the main power supply input. If we want to use LM358 as a comparator, we can give input voltage from 3V to 32V. If we want to use the LM358 as an operational amplifier then we will give the supply voltage from ±1.5V to ±16V. LM358 contains two operation amplifiers (A&B as in the pin diagram) where the input of the first amplifier (A) is pin 2 and pin 3 and the output is pin 1. If we want to use the second amplifier (B), then the input for this amplifier is at pins 5 and 6 and the output is at pin 7.
For the comparison of two signals, we will give one signal at pin 2 and the other signal at pin 3. The voltage of pin 2 will be compared with that of pin 3, and the voltage of pin 6 is compared with that of pin 5, corresponding to two independent outputs: Output A and Output B.
When the input at Non-inverting input A (+) at pin 3 is greater than the input at Inverting input A (-) at pin 2, the output of op-amp A will be high. Similarly, When the input at Non-inverting Input B (+) at pin 5 is greater than the input at Inverting Input B (-) at pin 6, the output of op-amp B will also be high.
On the other hand, when the input at Non-inverting Input A (+) at pin 3 is less than the input at Inverting Input A (-) at pin 2, the output of op Amp A will be low. Similarly, when the input at Non-inverting Input B (+) at pin 5 is less than the input at Inverting Input B (-) at pin 6, the output of op-amp B will also be low.
No pull-up resistor is required at the output of LM358.
LM358 Applications
LM358 Dual Op-Amp IC is widely used in many real-life applications. Some of the major applications of LM358 IC are listed below:
- DC gain block
- General Signal conditioning
- General Signal Amplification
- Transducer Amplifier
- Operational Amplifier Circuit
- Current Loop Transmitters for 4 to 20 mA
- Active Filters
- Comparators (Loop control & regulation)
- Integrator, Differentiator, Adder, Voltage follower, etc.
- It can be used in real-life applications like shock alarm circuits and dark sensor circuits.
Advantages
The followings are the advantages of LM 358 IC:
- Two operational amplifiers are compensated internally. we can use both op-amps at a time or if we need only one op-amp we can use it
- Two internally compensated for OP-AMP
- Removes the necessity of dual supplies
- Power drains suitable for operation of the battery
- Permits direct sensing close to GND and VOUT
- Compatibility with all forms of logic
LM 358 IC Packages
LM358 Dual Op-Amp IC has four different types of packages and they are DSBGA, PDIP, TO-CAN, and SOT-25(5). All of these packages along with their dimensions and part numbers are given in the tabular diagram shown below.
