TL072 Pinout: Specifications, Applications, and Maintenance

TL072 Pinout Diagram

The TL072 comes in an 8-pin dual in-line package (DIP-8) or small-outline integrated circuit (SOIC-8) package. The pinout diagram for the TL072 is as follows:

Pin	Function
1	Output A
2	Inverting Input A
3	Non-Inverting Input A
4	V- (Negative Supply)
5	Non-Inverting Input B
6	Inverting Input B
7	Output B
8	V+ (Positive Supply)

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TL072 Specifications

The TL072 has the following key specifications:

Parameter	Value
Supply Voltage Range	±5V to ±18V
Input Offset Voltage	3 mV (typical)
Input Bias Current	65 nA (typical)
Input Impedance	1012 Ω
Gain-Bandwidth Product (GBP)	3 MHz (typical)
Slew Rate	13 V/μs (typical)
Output Current	±30 mA (minimum)
Operating Temperature Range	-40°C to +85°C

These specifications make the TL072 suitable for a wide range of applications, including audio processing, active filtering, and signal conditioning.

Input and Output Characteristics

The TL072’s high input impedance (1012 Ω || 3 pF) minimizes loading on the signal source, making it ideal for use with high-impedance sensors and transducers. The low input bias current (65 nA typical) and low input offset voltage (3 mV typical) ensure accurate signal processing with minimal DC offset.

The output stage of the TL072 can source or sink up to ±30 mA, allowing it to drive a variety of loads, including low-impedance headphones and small speakers. The slew rate of 13 V/μs ensures that the output can track fast-changing input signals without significant distortion.

Noise Performance

The TL072 is known for its low noise performance, making it suitable for audio applications and precision signal conditioning. The equivalent input noise voltage is typically 18 nV/√Hz at 1 kHz, while the equivalent input noise current is typically 0.01 pA/√Hz.

Applications of the TL072

The TL072’s versatility makes it suitable for a wide range of applications, including:

Audio Processing

The TL072 is commonly used in audio applications, such as:

Preamplifiers
Equalizers
Active filters
Mixers
Tone controls

Its low noise, high input impedance, and wide bandwidth make it an excellent choice for these applications.

Instrumentation and Signal Conditioning

The TL072 is also used in various instrumentation and signal conditioning applications, such as:

Sensor amplifiers
Transducer interfaces
Precision rectifiers
Sample-and-hold circuits
Voltage-to-current converters

Its low input offset voltage and low input bias current ensure accurate signal processing in these applications.

Active Filtering

The TL072 can be used to implement various active filter topologies, such as:

Butterworth filters
Chebyshev filters
Bessel filters
Elliptic filters
State-variable filters

Its wide bandwidth and high slew rate allow for the realization of high-order filters with minimal distortion.

TL072 Application Circuits

Here are a few example application circuits using the TL072:

Non-Inverting Amplifier

A non-inverting amplifier can be implemented using the TL072 as follows:

        +
      __|__
     |     |
Vin --| + |
     |     |
     |  -  |
     |_____|
        |
        |
        /
       / R2
      /
     |
     |
    ___
    ___
     |
     |
     |
    _|_
     |
     |
    GND

Vout = Vin * (1 + R2/R1)

Active Low-Pass Filter

A second-order Sallen-Key low-pass filter can be implemented using the TL072 as follows:

        C1
      __|__
     |     |
Vin --     |
     |     |
     |_____|
        |
        |
        /
       / R1
      /
     |
     |      +
    __|__  __|__
   |     ||     |
   |  +  || - | |
   |     ||   | |
   |  -  ||___| | C2
   |_____|      |
     |          |
     |          |
    GND        GND

fc = 1 / (2π * √(R1 * R2 * C1 * C2))
Q = (1/2) * √((R1 * R2 * C1 * C2) / (R1 * C1 + R2 * C2))

TL072 Maintenance and Troubleshooting

To ensure optimal performance and longevity of the TL072 in your designs, consider the following maintenance and troubleshooting tips:

Ensure proper power supply decoupling using ceramic capacitors close to the IC’s power pins.
Avoid exceeding the maximum supply voltage and output current ratings.
Use appropriate heat sinking when operating at high temperatures or with high output currents.
Protect the inputs from excessive voltage transients using series resistors or diodes.
Check for proper grounding and minimize ground loops to reduce noise pickup.
Verify the correct pinout and connections when troubleshooting a malfunctioning circuit.

Frequently Asked Questions (FAQ)

1. Can the TL072 be used with single-supply operation?

Yes, the TL072 can be used with single-supply operation, but the input and output voltages must be properly biased to avoid clipping. A typical single-supply range is 3V to 16V.

2. Is the TL072 pin-compatible with other op-amps?

The TL072 is pin-compatible with many other Dual Op-amps, such as the LM358, LF353, and MC1458. However, always check the datasheet for specific compatibility and performance differences.

3. What is the difference between the TL072 and TL082?

The TL072 and TL082 are similar dual op-amps, but the TL082 has a higher slew rate (20 V/μs typical) and a higher gain-bandwidth product (4 MHz typical). The TL082 also has a slightly higher supply current than the TL072.

4. Can the TL072 be used for video applications?

While the TL072 can be used for some video applications, its 3 MHz gain-bandwidth product may limit its performance in high-frequency video signals. For more demanding video applications, consider using a faster op-amp like the TL082 or a dedicated video amplifier IC.

5. How do I select the appropriate feedback resistor values for a TL072 amplifier circuit?

To select the appropriate feedback resistor values, first determine the desired gain of the amplifier. For a non-inverting amplifier, the gain is given by (1 + R2/R1). Choose resistor values that provide the desired gain while keeping the impedances within the recommended range for the TL072 (typically 1 kΩ to 100 kΩ). Also, consider the noise performance and power dissipation when selecting resistor values.

In conclusion, the TL072 is a versatile and widely used dual op-amp that offers excellent performance in a variety of applications, including audio processing, instrumentation, and active filtering. By understanding its pinout, specifications, and application circuits, designers can effectively utilize the TL072 in their projects. Proper maintenance and troubleshooting techniques can help ensure optimal performance and longevity of the TL072 in electronic designs.