The TL072 is a dual operational amplifier IC. It uses JFET inputs to work better. Many electronics experts and hobbyists pick the TL072 because it makes little noise and works fast. This op-amp is good for analog signal processing. It has high input impedance and a fair gain bandwidth product. The TL072 is quieter and has higher input impedance than older op-amps. People trust the TL072 for audio and measurement circuits. Knowing the TL072’s pinout, features, and datasheet helps designers use it well in projects. The TL072 is easy to use and works well, so many people like it as a dual operational amplifier.
Key Takeaways
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The TL072 has two fast, low-noise operational amplifiers in one chip. This helps save space and power in circuits.
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Its JFET input design gives very high input impedance. It also has low input bias current. This keeps signals strong and accurate.
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The chip works with a wide supply voltage range. It also has short-circuit protection. This makes it flexible and safe to use.
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The TL072 has a high slew rate and low offset voltage. It can handle fast signals clearly. It also reduces distortion.
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The TL072 is great for audio, signal conditioning, and filter circuits. Both experts and hobbyists like to use it.
TL072 Overview
Dual Operational Amplifier Design
The TL072 is a dual operational amplifier. It has two op-amps in one 8-pin chip. This helps save space on a circuit board. It also makes building circuits easier. Each op-amp can handle signals that change quickly. The slew rate is about 20 V/µs. The TL072 uses little power, about 940 µA for each channel. It also has a low offset voltage, around 1 mV. These features help it work well in many projects. You can use it in audio mixers and motor drives. The TL072 can use different power supplies, from ±2.25 V to ±20 V. This gives designers more choices. It also protects against static and radio waves. This makes it reliable for many uses.
JFET Input and Op-Amp Technology
The TL072 uses JFET input technology. This gives it some benefits over older bipolar input op-amps. The table below shows how the TL072 compares to a bipolar input op-amp:
| Parameter | Bipolar Input Op-Amp | JFET Input Op-Amp (TL072) |
|---|---|---|
| Input Impedance | ~5 MΩ | Very High |
| Input Bias Current | ~200 nA | <10 pA |
| Noise Level | Moderate | Low (~18 nV/√Hz) |
| Slew Rate | ~1 V/µs | ~13 V/µs |
| Bandwidth | ~3 MHz | ~4 MHz |
| Input Offset Voltage | ~1 mV | <3 mV |
| CMRR | Moderate | Higher |
| Input Voltage Range | Limited | Wide (up to VCC+) |
| Extra Features | None | Short-circuit protection |
The JFET input stage gives the TL072 high input impedance. It also has very low input bias current. This makes it good for sensitive audio and measurement circuits. The TL072 has low noise and a high slew rate. These help keep signals clear and correct.
Why Choose TL072
Many designers like the TL072 because it works well for analog signals. Its JFET input design is fast and quiet. This keeps sound clear and measurements correct. The TL072 gives you:
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Fast signal response with a high slew rate
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Low input bias and offset currents for better accuracy
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A wide supply voltage range for more power options
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Output short-circuit protection for safety
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Two op-amps in one chip for easy design
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Low power use to save energy
The TL072 is good for both experts and hobbyists. Its features make it a great choice for audio, measurement, and other analog signal uses.
Pinout
TL072 Pin Configuration
The TL072 uses a standard 8-pin layout. This layout is common for many dual op-amp ICs. The pin configuration helps users connect the chip correctly in their circuits. The table below shows each pin and its main function:
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | 1OUT | Output of first op-amp |
| 2 | 1IN- | Inverting input of first op-amp |
| 3 | 1IN+ | Non-inverting input of first op-amp |
| 4 | Vcc- | Ground (negative supply voltage) |
| 5 | 2IN+ | Non-inverting input of second op-amp |
| 6 | 2IN- | Inverting input of second op-amp |
| 7 | 2OUT | Output of second op-amp |
| 8 | Vcc+ | Positive supply voltage |
Tip: Always check the orientation of the TL072 before placing it on a breadboard or PCB. The notch or dot on the package marks pin 1.
Pin Functions
Each pin on the TL072 serves a special purpose. Pins 1 and 7 give the output signals from the two op-amps. Pins 2 and 6 are the inverting inputs, while pins 3 and 5 are the non-inverting inputs. These input pins connect to the signals that need amplification. Pin 4 connects to the negative supply or ground, and pin 8 connects to the positive supply voltage. The high input impedance of the JFET inputs (pins 2, 3, 5, and 6) means the TL072 does not load down the signal source. This feature is important in audio and precision circuits. The outputs (pins 1 and 7) send the amplified signals to other parts of the circuit. Proper connection of the power supply pins (4 and 8) ensures stable operation and low noise.
Package Types
Manufacturers offer the TL072 in different package types. The most common is the 8-pin dual in-line package. This package is easy to use in breadboards and through-hole PCBs. Another popular option is the small-outline integrated circuit, or SOIC-8. This surface-mount package works well for compact designs. The SOIC-8 package measures about 10.16 mm long, 7.11 mm wide, and 4.95 mm high, with a typical pin spacing of 1.27 mm. Both package types make the TL072 flexible for many projects, from hobby circuits to professional audio gear.
Features
Low Noise Performance
The TL072 is known for making very little noise. It has about 18 nV/√Hz of voltage noise. Some newer op-amps, like the OPA1652, make even less noise at 4.5 nV/√Hz. But the TL072 still works great in most audio and sensor circuits. In circuits with high-impedance, like electric guitar preamps, the noise from the resistor matters more than the op-amp’s noise. The difference in sound between the TL072 and quieter op-amps is usually hard to hear.
| Parameter | TL072 | OPA1652 |
|---|---|---|
| Voltage Noise (nV/√Hz) | ~18 | 4.5 |
| Noise Figure (dB, 25kΩ source) | 2.55 | 0.05 |
| Combined Noise (µV/√Hz) | 26.99 | 20.22 |
| Noise Improvement (dB) | N/A | ~2.5 dB better |
Note: The TL072’s low noise makes it good for high-quality audio preamps, microphone preamps, and sensor circuits. It also works well in amplifiers and other analog circuits where clear signals are important.
High Slew Rate
The TL072 can handle fast changes in signals. Its slew rate is usually between 16 and 20 V/μs. This high slew rate helps keep signals clear in circuits with high frequencies. It lowers distortion and keeps audio signals clean, even when they change quickly. Other op-amps, like the JRC4558 or LM358, have much lower slew rates.
| Operational Amplifier | Typical Slew Rate (V/µs) |
|---|---|
| TL072 | 20 |
| JRC4558 | 1.7 |
| NE5532 | 9 |
| LM158 / LM358 | 0.3 |
The TL072’s fast slew rate lets it work well in audio mixers and filters. It is also good for circuits that need quick response. This feature helps the TL072 work in high-frequency analog designs.
Low Input Offset
The TL072 has low input offset voltage and low input bias current. These features help keep signal mistakes small. The input offset voltage is about 1 mV, and the input bias current is around 20 pA. These low numbers are important in circuits that need to be very accurate, like audio preamps and amplifiers. They help the output signal match the input, with little error.
| Parameter | Typical Value | Importance |
|---|---|---|
| Input Offset Voltage | 1 mV | Keeps signal errors small, so circuits work well. |
| Input Bias Current | 20 pA | Helps keep signals accurate, especially in quiet circuits. |
The TL072’s low input bias current makes it better than some other op-amps for weak signals. This helps stop unwanted voltage drops and keeps the signal right.
High Input Impedance
The TL072 uses a JFET input stage, which gives it very high input impedance. This means it takes almost no current from the signal source. High input impedance stops loading, so the signal stays strong and clear. This is very helpful in audio and sensor circuits where you want to keep the signal quality.
The TL072’s low input bias current and high input impedance let designers use bigger resistors in the input. This can lower the noise and reduce distortion. Circuits with the TL072 can connect to weak signals without losing accuracy or adding noise. The op-amp’s low voltage and current noise also help keep signals clean in sensitive circuits.
Tip: The JFET input stage in the TL072 makes input impedance higher and improves accuracy. This helps keep signals clear, so the TL072 is a good pick for both professional and hobby analog projects.
Datasheet Specs
Electrical Characteristics
The tl072 works well in audio and analog circuits. It can use supply voltages from ±2.25 V to ±20 V. This means you can use it in many projects. The input bias current is very low at about 20 pA. This helps keep signal mistakes small. That is important for audio and sensor circuits. The output voltage swing depends on the supply voltage. Each channel can handle up to 40 mA. The tl072 has a fast slew rate, between 16 and 20 V/µs. The offset voltage is usually 1 mV. Each channel uses about 940 µA of current.
| Parameter | TL072 Specification |
|---|---|
| Supply Voltage Range | ±2.25 V to ±20 V |
| Input Bias Current | 20 pA (typical) |
| Output Voltage Swing | Up to 40 mA per channel |
| Slew Rate | 16-20 V/µs |
| Offset Voltage | 1 mV (typical) |
| Supply Current | 940 µA per channel |
Note: The tl072’s low input bias current and fast slew rate are great for clear audio and accurate analog circuits.
Absolute Maximum Ratings
You must follow the tl072’s maximum ratings to keep it safe. If you go over these limits, the IC can break. The highest supply voltage is 36 V. The input voltage should not be higher than the supply rails. Each channel can give up to 40 mA of output current. You can store the tl072 between -65°C and +150°C.
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Maximum supply voltage: 36 V
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Maximum output current per channel: 40 mA
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Storage temperature: -65°C to +150°C
Always check these numbers before using the tl072 in a new project.
Performance Parameters
The tl072 has low total harmonic distortion (THD) and blocks noise well. Its THD is about 0.003%, so audio stays clean. The common-mode rejection ratio (CMRR) is 70 dB. This helps block unwanted noise. The gain bandwidth product is 4 MHz. The input noise voltage is about 18 nV/√Hz at 1 kHz. These features help the tl072 give clear sound and good signal processing.
| Parameter | Typical Value |
|---|---|
| Total Harmonic Distortion (THD) | 0.003% |
| Common-Mode Rejection Ratio (CMRR) | 70 dB |
| Slew Rate | 16-20 V/µs |
| Input Offset Voltage (Vos) | 1-3 mV |
| Bandwidth | 3-4 MHz |
| Gain Bandwidth Product | 4 MHz |
| Input Noise Voltage | 18 nV/√Hz at 1 kHz |
The tl072’s low noise, high input impedance, and low distortion make it popular for audio mixers, preamps, and accurate analog circuits. These specs help keep signals clear and right in tough jobs.
Applications
Audio Circuits
The TL072 is often picked for audio circuits. Many engineers use this op-amp in audio preamps, mixers, and effects pedals. It makes sound clear because it has low noise and a fast slew rate. Professional audio mixers use the TL072 to cut down on noise and distortion. People who build things at home also use this operational amplifier in guitar pedals and home audio projects. The JFET input stage gives high input impedance, which works well with audio sources that have high impedance. These features make the TL072 great for high-quality and low-noise audio uses.
Note: The TL072 gives better sound than many other op-amps, like the JRC4558, especially in circuits that need precise audio.
Common audio applications:
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Audio preamplifiers
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Mixers and audio consoles
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Effects pedals
Active Filters
Designers use the TL072 to make active filters. These filters can be low-pass, high-pass, or band-pass types. The TL072 keeps signals clean because it has low noise and high input impedance. Its fast slew rate helps filters work well at high frequencies. You can change resistor and capacitor values to set the filter’s cutoff and quality. This makes the TL072 a good pick for audio gear, test tools, and electronics for consumers.
Benefits in filter applications:
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Picks exact frequencies
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Keeps signal loss low
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Works well for both pros and hobbyists
Signal Conditioning
The TL072 is good for signal conditioning in measurement and test circuits. It can make small signals from sensors bigger and more accurate. Low offset voltage and low input bias current help keep errors small. High input impedance stops the circuit from loading weak sources. Engineers use the TL072 in battery testers, motor drives, and other measuring tools. These jobs need the TL072 for reliable and correct signal processing.
| Feature | Benefit in Signal Conditioning |
|---|---|
| Low noise | Keeps the signal clear |
| High input impedance | Stops signal loss |
| Low offset voltage | Makes measurements more accurate |
| Short-circuit protection | Makes circuits safer |
Other Op-Amp Uses
The TL072 can do many other op-amp jobs. It can be a voltage follower, integrator, or buffer. These jobs are important for analog signal work. The TL072 has two op-amps in one chip, so it saves space and power in big circuits. Both experts and hobbyists use it in synthesizers, analog computers, and test tools. Its many uses and strong performance make it a favorite for lots of projects.
Tip: The TL072 works well in simple and hard projects, so many designers choose it as their main operational amplifier.
The TL072 is special because it has two operational amplifiers in one chip. It uses a JFET input that works fast and makes little noise. Experts say it gives clear signals and does not use much power. It also has good short-circuit protection, so it is safe to use.
Many people pick the TL072 for audio, measurement, and analog signal jobs. It works fast, has low offset voltage, and can be used in many ways.
The TL072 is popular with both professionals and hobbyists. To get the best results, designers should read the datasheet and test it in different circuits.
| Resource | Usefulness |
|---|---|
| TL072 datasheet | Shows technical details and how to use it |
| Audio circuit guides | Gives helpful ideas for building projects |
FAQ
What is the main advantage of JFET input in an op-amp?
A JFET input gives the op-amp very high input impedance. This means it draws almost no current from the signal source. High input impedance helps keep signals strong and accurate.
Can the TL072 replace other dual op-amps in circuits?
Many circuits allow the TL072 to replace other dual op-amps. Designers should check the supply voltage, pinout, and performance needs before swapping. The TL072 works well in audio and analog signal circuits.
What is the typical supply voltage range for this IC?
This IC works with supply voltages from ±2.25 V to ±20 V. It can run on both single and dual power supplies. This wide range makes it flexible for many projects.
Does the TL072 work for battery-powered devices?
Yes, the IC uses low power. It fits well in battery-powered devices. Its low current draw helps batteries last longer.
How does the TL072 handle fast-changing signals?
The IC has a high slew rate. It can handle signals that change quickly. This feature keeps audio and analog signals clear and free from distortion.
Written by Jack Elliott from AIChipLink.
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