TL074 Pinout, Datasheet, Equivalent, Uses, and TL074 vs. TL084

An operational amplifier, or op-amp, is an integrated circuit primarily used to amplify weak electrical signals. Typically, an op-amp has two inputs and a single output. It amplifies the signal and produces a voltage difference between the two inputs. Various types of op-amp ICs are available in the market to meet different requirements. The TL074 is a popular op-amp model known for its suitability in audio preamplification due to its low harmonic distortion and noise. It offers the advantage of adjustable input offset through specific circuitry.

Moreover, it features internal frequency compensation and operates as if it were latch-free. In this comprehensive guide, we'll delve into the TL074 pinout, circuit diagram, equivalent, datasheet, uses, and compare it with TL084, etc. Everything you need to know about the TL074 operational amplifier.

What is TL074?

The TL074 is a JFET-input quad monolithic operational amplifier containing four op-amps. It features high-voltage BJTs and JFETs. Each op-amp in this device integrates well-matched, high-voltage JFETs and bipolar transistors in a single package. The input bias and bias currents are low, while the slew rate is exceptionally high.

The TL074 is highly recommended for audio preamplification due to its low harmonic distortion and noise. It also allows for adjustment of input offset using specific circuits.

Furthermore, internal frequency compensation is possible with the TL074, and it operates without latch-up. Within the TL07X family, both the TL071 and TL072 are single and dual-operational amplifier versions, respectively.

TL074 Pinout

The TL074 is available in a 14-pin package known as SOIC-14. The pinout diagram below illustrates its pin configuration.

TL074 Pin Configuration

Functions of Each Pin

• Offset Null (Pins 1 and 5): This is used to nullify the input offset voltage, which is important for applications requiring precise DC performance.
• Inverting and Non-Inverting Inputs (Pins 2, 3, 9, 10, 13, and 14): These pins are used to provide the input signal to the op-amps. The inverting input (-) is where the inverted signal is applied, while the non-inverting input (+) is where the non-inverted signal is applied.
• Output (Pins 6, 11, and 15): These pins provide the output of the op-amps, which is the amplified version of the input signal.
• Supply Voltage (Pins 4, 7, and 12): These pins are connected to the positive and negative supply voltages (V+ and V-) to power the op-amps.
• NC (Pin 8): This pin needs to be internally connected and is often left unconnected in typical applications.

Features of TL074

• Wide common-mode (up to VCC+) and differential voltage range
• Low input bias and offset current
• Low noise en = 15 nV/ √Hz (typical)
• Output short-circuit protection
• High input impedance JFET input stage
• Low harmonic distortion: 0.01% (typical)
• Internal frequency compensation
• Latch-up free operation
• High slew rate: 16 V/µs (typical)

TL074 Specifications

TL074 Equivalent/Alternative

The TL074 operational amplifier (op-amp) has several equivalents that can be used as alternatives in various circuit designs. These equivalents include:

LM324: It is a quad op-amp with similar specifications to the TL074. It is commonly used in audio and signal processing applications.

TL071: This is a single op-amp that can substitute for the TL074 in applications requiring only one operational amplifier.

TL072: This dual op-amp offers similar performance to the TL074 and is commonly used in audio and control applications.

LF351 is a high-speed, JFET-input op-amp that can replace the TL074 in applications requiring high input impedance and low noise.

LM741: It is a general-purpose op-amp that can be used as an alternative to the TL074 in many applications. However, it has lower performance specifications compared to the TL074.

LM709: This is a high-gain, high-performance op-amp that can replace the TL074 in applications requiring high precision and stability.

LM201: It is a high-speed, high-output-current op-amp that can be used as an alternative to the TL074 in applications requiring high-speed signal processing.

MC1439: This quad op-amp has similar specifications to the TL074 and is suitable for use in applications requiring multiple operational amplifiers.

LM748: It is a quad op-amp with similar specifications to the TL074. It is commonly used in audio and signal processing applications.

TL074 CAD Model

TL074 Schematic

Where and How to Use TL074

The TL074 is a quad-package operational amplifier, meaning it contains four separate op-amps that can be used independently.

This op-amp stands out for its use of high-voltage JFET and bipolar transistors, giving it a high input impedance and low bias current. It also boasts low noise and harmonic distortion, making it ideal for audio preamplifiers. If you're looking for a quad op-amp IC with JFET drivers, the TL074 is worth considering.

Two power supplies are required to power the TL074, typically connected to pins 4 and 11. Pin 4 is for the positive power supply, while Pin 11 is for the negative power supply.

For each op-amp:

• The inverting input is connected to pin 2 for the first op-amp, pin 6 for the second, pin 9 for the third, and pin 13 for the fourth.
• The non-inverting input is connected to pin 3 for the first op-amp, pin 5 for the second, pin 10 for the third, and pin 12 for the fourth.
• The output is taken from pin 1 for the first op-amp, pin 7 for the second, pin 8 for the third, and pin 14 for the fourth.

TL074 Op-Amp Design Considerations

Op-amps are indispensable in electronics. They offer diverse application circuits, each with unique features. However, there are common design considerations applicable across most op-amp circuits.

Inputs: Op-amps boast high input impedance, ensuring minimal signal disruption. The input stage is intricate, demanding attention to the input common-mode range to prevent exceeding the rail voltage, which could trigger latch-up and circuit damage. Also, the voltage disparity between the inverting and non-inverting pins should not surpass the differential input voltage rating.

Output: Unlike rail-to-rail op-amps, the TL074 won't reach maximum positive or negative voltage outputs when saturated. It consistently exhibits a voltage drop of approximately 2V from the supply voltage due to the Vce voltage drop within its internal transistors. It's worth noting that a saturated op-amp draws increased current, leading to elevated power loss.

Gain/Feedback: Although op-amps offer a high open-loop gain, noise is a common issue. Thus, many circuits opt for closed-loop configurations to mitigate noise by limiting the gain. Negative feedback is favored for its predictable performance and stable operation.

Terminating Unused Op-Amp Pins

For ICs like the TL074 with a quad op-amp package, it's common to use only some of the four op-amps in a design. In such cases, it's crucial to terminate the unused op-amps to prevent issues properly. Otherwise, the unused pins can develop stray capacitance, leading to noise pickup and performance issues. Additionally, unterminated op-amps consume more power, reducing the design's efficiency. There are various methods to terminate an op-amp, but a commonly used approach is detailed below.

To terminate an unused op-amp:

1. Connect the inverting pin of the op-amp to its output pin.
2. Provide a constant voltage source to the non-inverting pin. This voltage should be within the supply voltage limits (common-mode voltage range).

It's not always necessary to use two resistors for this termination; any available voltage within the specified range from the circuit can be used to terminate the non-inverting pin of the op-amp.

TL074 Example Circuits

Audio Preamplifier

Positive Feedback Bandpass Filter

Headphone Amplifier

The TL074 operational amplifier is commonly utilized in various circuit designs, including headphone amplifier circuits, where it plays a crucial role in driving the headphones.

This circuit utilizes a single TL074 IC and a 9V battery to power the amplifier circuit. The headphone amplifier is designed to deliver high power, around 100 units (200 mW peak), into a 32-ohm load with a voltage gain of approximately 7.6 times (17.6 dB).

TL074 Application

TL074 finds application in the construction of various circuits, including:

• Voltage follower
• Unity gain inverting amplifier
• Bilateral current source
• AC/DC converter
• Instrumentation amplifier
• Square wave generator
• Voltage comparator
• Power supplies
• Oscillators
• Half-wave rectifiers
• Circuits requiring high input impedance
• Comparators
• Buffer applications
• DC Gain Blocks
• Differentiator, Integrator, Summer, Voltage follower, Adder, etc.
• Filter Circuits

TL074 Practical Examples

• AD conversion in mobile phones
• Audio amplifiers
• Programmable logic controllers
• Video signal conditioning units
• Processors
• Sensor data acquisition
• Digital-to-analog converters in phones
• Temperature sensors and controllers
• Error amplifiers
• Communication circuits
• Mobile phone chargers
• Receivers
• Modulators
• Synthesizers

TL074 Package

TL074 Datasheet

Download TL074 Datasheet PDF.

TL074 vs. TL084

When comparing the TL074 and TL084 operational amplifiers, several key differences in features, specifications, performance, and functionality become apparent. Understanding these differences can help in choosing the right op-amp for a specific application.

Conclusion

In conclusion, the TL074 operational amplifier is a versatile component that finds wide application in various electronic circuits. Its quad-channel configuration makes it particularly useful in systems requiring multiple amplifiers in a single package. The TL074 offers a good balance of performance, cost, and ease of use, making it a popular choice among electronics enthusiasts and professionals alike.

The TL074's versatility lies in its ability to perform well in a variety of applications, from audio amplification to signal conditioning. Its ease of use, coupled with its wide availability and affordability, makes it a go-to component for many circuit designers. Whether used in basic amplifier circuits or more complex signal processing applications, the TL074 consistently delivers reliable performance.

Read More

• UA741CP Pinout, Circuit, Equivalent, Datasheet, UA741CP vs. LM741
• L7805CV Pinout, Circuit, Datasheet, and Uses
• A Comprehensive to N-Channel JFET
• How Is a Microprocessor Different From an Integrated Circuit