The device requires a low supply current and yet maintains a large gain bandwidth product and a fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF is pin compatible with the standard LM and uses the same offset voltage adjustment circuitry. This feature allows designers to immediately upgrade the overall performance of existing LM designs. The device has low noise and offset voltage drift, but for applications where these requirements are critical, the LF is recommended.

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The slew rate here is rapid and bandwidth gain product is quite high too. This high product of gain and bandwidth along with a fast slew rate is at the cost of low value of supply current of value 1.

Input offset voltage compensation is provided internally in LF The input bias and offset currents are very low because of JFET input devices where voltage is well matched. The typical value of input bias current is 50 pA. The bandwidth is around 4 MHz. This IC is therefore upgraded alternative of conventional LM LF is available as an 8-pin IC. Its pinout diagram is shown as:. You can check the datasheet given at the end for further information.

These input voltages are recommended to keep lower than the negative supply voltage. If the common mode input voltage is kept equal to the positive supply voltage, the slew rate along with gain bandwidth will be compromised. Care should be taken in order to avoid reverse polarity of the supply voltage which will effectively make the whole IC faulty. In order to use LF, supply voltage is applied in such a way that its negative end is connected to pin no.

Inverting input is connected to pin no. Pin no 1 and 5 are utilized for offset or balancing. Pin no 8 is kept unused. A simplified schematic of LF is shown as:.

One of the simplest application LF IC is a high input impedance inverting amplifier, which is shown as:. This example circuit generates a square wave of 0. Based on the selected resistor and capacitor values, we can change output frequency. If you are using this operational amplifier IC in your next project, you will need a 2D dimension diagram to design a PCB.

This picture shows a 2D dimension diagram for the DIP8 package. For a 2D diagram of SO-8 package, you can download datasheet provided at the end of article. Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents.


Introduction to LF351

This op-amp has a very high-speed input, and it is the most commonly available IC in the market because of its features like low cost as well as good act characteristics. This IC gives a high gain bandwidth result although it requires a very low-current supply. This operational amplifier will combine two states of the analog technologies on an only monolithic IC integrated circuit. This article discusses an overview of LF Op-Amp. It is a low-cost integrated circuit and gives high-performance characteristics.


ST Microelectronics

The unit uses a reduced supply current and still sustains a substantial gain bandwidth product and a extremely fast slew rate. Additionally, well matched high voltage JFET input devices offer surprisingly low input bias and offset currents. The LF is pin-to-pin compatible with the standard LM and employs exactly the same offset voltage realignment circuitry. This characteristic permits users to promptly improve the efficiency of the standard existing LM models. The IC features almost zero noise and offset voltage drift, however for applications in which all these necessities are essential, the LF strongly recommended.


LF351 Op-Amp IC : Datasheet, Pin Details, Application Circuits


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