LM1458 Dual Operational Amplifier: Pinout, Datasheet, and Equivalent

The LM1458 is a dual general-purpose operational amplifier (op-amp) featuring two built-in amplifiers that share a common power supply and common mode voltage. This arrangement creates interdependence between the two amplifiers.

Operating within a temperature range of 0˚C to +70˚C, the LM1458 boasts several remarkable features. These include low power consumption, latch-up-free operation, short circuit protection, and the absence of the need for external components for frequency compensation.

The op-amp's high common mode voltage range, coupled with its immunity to "latch-up," makes it exceptionally well-suited for applications requiring voltage followers. Furthermore, its high gain and wide operating voltage range contribute to superior performance in integrators, summing amplifiers, and various general feedback applications.

LM1458 Pinout

Pinout Configuration

The LM1458 IC features a total of 8 pins, which serve various functions related to inputs, outputs, and power. The table below provides a reference for understanding the pin configuration of this op-amp IC.

Pin No.	Pin Type	Description
1	Output A	Op-Amp 1 Output
2	Inverting Input A	Op-Amp 1 Inverting Input
3	Non-inverting input A	Op-Amp 1 Non-inverting input
4	V-	Ground
5	Non-inverting input B	Op-Amp 2 Non-inverting input
6	Inverting input B	Op-Amp 2 Inverting input
7	Output B	Op-Amp 2 output
8	V+	Positive supply voltage

LM1458 Features and Specifications

• Operating Voltage Range: 12V DC to 18V DC (Maximum)

• Maximum Power Dissipation: 400 mW

• Operating Temperature Range: 0°C to +70°C

• Common Mode Rejection Ratio: 70 dB to 90 dB

• Slew Rate: 0.5 V/µs

• Input Offset Voltage: 5 mV

• Type: Dual Op-Amp with JFET Input

• Maximum Offset Voltage (at 25°C): 6 mV

• Typical Quiescent Current per Channel: 1.5 mA

• Typical Voltage Noise at 1 kHz: 30 nV/√Hz

• Package Types: 8-lead CAN and 8-lead Mini DIP

• Large Common-Mode and Differential Voltage Ranges

• No Frequency Compensation Required

• Short Circuit Protection

• Wide Differential Voltage Range

• Low Power Consumption

• No Latch-Up When Input Common Mode Range is Exceeded

Working and Need of an Operational Amplifier

An operational amplifier, often referred to as an op-amp, serves as a voltage amplifier in electronic circuits and functions in conjunction with external components like resistors and capacitors. These external components determine the specific role of the op-amp. The LM1458 is a dual operational amplifier with numerous applications, with one of its prominent uses being in audio amplification. Another common application for op-amps is in voltage follower circuits.

A voltage follower circuit, created with an op-amp, proves highly valuable due to its circuit's high impedance. This type of circuit is alternatively known as a buffer circuit or a unity gain amplifier, as it possesses a voltage gain of 1. In this configuration, the circuit does not amplify the input voltage but rather produces an output voltage that mimics the input voltage (the output voltage matches the input voltage). In the depicted circuit, the input voltage is applied to the non-inverting terminal of the op-amp IC. The inverting terminal, on the other hand, is linked to the op-amp's output, which is connected to a load. The output voltage is then obtained across this load.

LM1458 Circuit

LM1458 Schematic Diagram

LM1458 Internal Block Diagram

LM1458 Application

• Voltage follower circuit

• Inversion circuits

• Current to voltage converter

• Rectifiers

• Comparator.

• Summing amplifier.

• Band pass filter.

• Multivibrator

• Narrow Band or Band Pass Filter

• DC amplifier

• Integrator or differentiator

LM1458 Alternatives

• TL074: The TL074 is a quad operational amplifier known for its low noise and high slew rate. It offers four op-amp circuits in a single package, making it suitable for various signal processing and amplification tasks.

• LF393N: The LF393N is a quad comparator IC that can serve as an alternative to the LM1458. Comparators are used for tasks like voltage level detection and waveform shaping in applications such as waveform generation and threshold detection.

• MCP6002: The MCP6002 is a dual operational amplifier with low power consumption and rail-to-rail input/output capability. It is often used in low-power and battery-operated devices where efficiency is crucial.

LM1458 Equivalents

• TLV9302: The TLV9302 is a dual low-power operational amplifier known for its low quiescent current and wide supply voltage range. It can be an equivalent option for applications where low power consumption is essential.

• LM1558: The LM1558 is another dual operational amplifier. It offers similar functionality to the LM1458 and can be a suitable replacement in various applications requiring dual op-amp circuits.

LM1458 Datasheet

Download LM1458 Datasheet PDF.

LM1458 Package

LM1458 is available in TO-99 8-Lead and PDIP 8-Lead packages.

LM1458 Using Warnings

Note: Prior to substituting these components in your circuit, ensure that you verify their parameters and pin configurations for compatibility.

Conclusion

The LM1458 dual operational amplifier is a reliable and versatile component that finds applications in a wide range of electronic circuits. Its dual op-amp configuration, wide voltage range, and low input offset voltage make it a favorite among electronics enthusiasts and engineers. Whether you're building an audio amplifier or a signal conditioning circuit, the LM1458 is a solid choice.

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