In an analog circuit, an op-amp or operational amplifier plays a key role as a basic building block. The main function of the operational amplifier is signal amplification, which takes in a differential input voltage and provides a single-ended output voltage. An op amp boosts a low-strength electrical signal to a high-level amplitude signal. There are different series of op amps available in the market, which are used based on the requirement, like AS, AP, TL & LM. This article provides brief information on one of the TL series op amps, namely the TL081 op amp, with pinout, specifications & its applications.
What is TL081 Op-Amp?
TL081 IC is a high-speed JFET (Junction Field Effect Transistor) input Op-amp that includes a JFET, including a high-voltage bipolar transistor. This op-amp provides high slew rate, low input voltage, low input offset current & low OVTC (Offset Voltage Temperature Coefficient). TL081 IC merges two cutting-edge linear technologies on top of a single monolithic IC. Every op amp compensated internally has well-suited high-voltage JFET input devices for low input offset voltage. This IC has a wide range of working voltages that possess direct interfacing ability with nearly every CMOS, PMOS & NMOS device.
TL081 IC works over an extensive range of industrial, military & commercial temperatures. This op amp needs a low-current supply and maintains a fast slew rate & large gain-bandwidth product. This IC can be used in computers, PCs, tablets, etc. The TL081 IC is a high-speed and low-cost JFET input op-amp with trimmed input offset voltage internally.
TL081 Op Amp
Pin Configuration:
The pin configuration of TL081 IC is shown below. This IC includes 8 pins, and each pin and its functionality are discussed below.
TL081 Op Amp Pin Configuration
- Pin1,5 (Offset NULL): It is used for setting the offset voltage if necessary.
- Pin2 (IN-): It is an inverting input pin of the IC.
- Pin3 (IN+): It is a non-inverting input pin of the IC.
- Pin4 (V-): This pin is connected to GND or a negative terminal.
- Pin6 (Output): The operational amplifier’s output pin.
- Pin7 (V+): It is connected to a +ve rail of the voltage supply.
- Pin8 (NC): Not Connected.
Features & Specifications:
The features and specifications of TL081 IC include the following.
- This IC provides a wide range of features like ESD protection or reduction, high noise immunity & extremely low power dissipation.
- TL081 IC has high input impedance, low power consumption, short-circuit protection, latch-up-free operation, wide differential input voltage ranges & wide common-mode input voltage ranges.
- This IC is available in PDIP and SOIC 8-Pin Packages
- Its voltage supply ranges from 7V to 36V.
- Its gain bandwidth product is 3 MHz.
- Its slew rate (SR) is 13 V/us.
- Common Mode Rejection Ratio (CMRR) is 70 dB – 86 dB.
- The operating current supply is 1.4 mA.
- Its input bias current is 200pA.
- Its power dissipation is 670mW.
- It has a high input impedance is 1012.
- It has a low current supply of 1.4 mA for each amplifier.
- This IC has a high slew rate of -13 V/µs.
- Its input offset voltage maximum ranges from 6.0 mV to 15 mV.
- Its input bias current is low – 30 pA.
- Its input offset current is low – 5.0 pA.
Equivalent & Alternative TL081 ICs
The equivalent TL081 ICs are; CA3140 & UA741. An alternative TL081 ICs are; AD620, LM4871, IC6283, LF351N, JRC45558 & MC33171N.
How to Run TL081 IC in a Circuit?
Some precautions must be taken to maintain the TL081 IC safely in a circuit in different applications. This IC’s operating voltage must range from 7V to 36 V, and its supply current should not be >1.4 mA. The storage and operating temperature range must be –40°Centigrade to 125°Centograde. Always stay under the maximum specification values or characteristics to get superior performance.
Solar Panel Battery Regulator Circuit with TL081 Op Amp
Generally, solar panels are very popular renewable energy sources. But one of the main problems faced by them is the energy output variation based on different environmental factors. These issues can be conquered by designing a solar panel battery regulator circuit with TL081 IC & IRFZ44 MOSFET. This circuit ensures energy output regulation by the solar panel for battery charging, protecting the panel & the device from electrical injury.
The circuit diagram of the solar panel battery regulator is shown below. The required components and connections of this circuit are shown in the diagram below.
Solar Panel Battery Regulator Circuit with TL081 Op Amp
Working
A solar panel system including a lead-acid battery is mainly designed for charging the battery even when there is less sunshine. However, this results in the requirement of a regulator to avoid overcharging whenever there is less sunshine. This circuit will divert surplus energy to a 12V icebox (or) ventilator.
Here, a shunt resistance is required to dissipate excess energy, although it should be able to absorb the whole power of the solar panel. Setting up the above circuit is simple & for safety reasons, a fuse is desirable. This circuit draws only a small amount of current within the quiescent condition when T1 is turned ON.
Thus, this circuit has become a significant part of solar panel systems for ensuring stability and reliability within energy production. The components of the circuit diagram provide regulated energy output by the solar panel, with the charging and protection of the battery and device. The working principle of this circuit diagram is to account for variations in environmental factors to ensure a reliable energy supply. In addition, the use of IRFZ44 & TL081 provides low power consumption & low cost with high efficiency within energy regulation. Thus, this circuit has become an essential component in the renewable energy field. So solar panel systems are an efficient & effective solution for achieving sustainable energy.
Advantages & Disadvantages
The advantages of TL081 IC include the following.
- The TL081 op amp has low distortion & low noise, which are suitable for a broad range of audio & signal processing applications.
- The high input impedance of this IC makes it a perfect choice wherever circuit loading should be reduced.
- This is a versatile and low-cost operational amplifier.
- It is the best choice for a wide range of electronic applications
- It has less power consumption, typically 1.4 mA.
- Its input bias current is low, typically 30 pA.
- It has o/p short-circuit protection.
- This IC has less total harmonic distortion, typically 0.003%.
- It has differential & wide common-mode voltage ranges.
- This IC can function as a single-supply (or) dual-supply based on the application.
- This op-amp provides a wider selection of audio signal applications.
The disadvantages of the TL081 IC include the following.
- TL081 IC is not a good choice, particularly for low DC voltages
- High slew rate JFET-input operational amplifier
- Its voltage supply range is limited.
- The output voltage swing of this IC is limited.
- Its frequency response is limited.
Applications
The applications of TL081 IC include the following.
- The TL081 IC is a JFET-input op amp, mainly designed to provide a wider selection as compared to the previously developed op-amp.
- This operational amplifier is used in many general-purpose applications like Buffers, voltage followers, Comparators, Adders, Amplifiers, etc.
- This IC is suitable for basic electronic circuit design.
- It is used in sample-and-hold amplifiers.
- It is used in active filters, peak detectors, comparators, function generators, etc.
- TL081 IC is used in Single-phase online UPS, power stage modules, battery test equipment, pro audio mixers & three-phase LIPS, etc.
- It is used in all standard op-amp applications.
- This op-amp is used in 5V TTL systems & low-voltage supply systems.
- It is used in string & central inverters of solar energy.
- This IC is used in motor drives like AC & servo drive control.
Please refer to this link for the TL081 Op-Amp Datasheet.
Thus, this is an overview of the TL081 op amp, pinout, specifications, circuit, working, and its applications. This is a general-purpose, high-speed JFET-input single op-amp with high noise immunity & superior offset characteristics. TL081 carries low offset current & high input impedance. Here is a question for you: what is the TL072 IC?