ST4EC502

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Trimmer potentiometers offer one of the most efficient and accurate solutions for adjusting resistance. They are frequently used in amplified circuits in which the amplification factor needs adjustment. ST4EC502, the most up-to-date trimmer potentiometer from STMicroelectronics, is based on a high-precision and reliable architecture that makes it ideal for industrial, automotive and consumer applications. Let’s take a look into ST4EC502 and its applications fields and working principle.

ST4EC502 features

ST4EC502 is a small, low-cost, low-power and high-reliability trimmer potentiometer structured in a 4-terminal network. It is designed to provide high-precision of adjustment in the range of 0.1Ω to 10KΩ. It consists of two resistive elements, the adjustable Contact and the Programmable Element. The adjustable contact is the same as a standard potentiometer. It is metallic and provides a good electrical and thermal contact to the resistive track. The Programmable Element is connected between the ground terminal and the adjustable contact. This design allows the output voltage to remain constant, even when the adjustment is made.

ST4EC502 applications

ST4EC502 trimmer potentiometers are used in a range of applications that require tight tolerance ofadjustment. They are particularly found in electronic circuits to vary the charging current of batteries, to modify the gain of amplifiers, and to adjust for on/off control. Moreover, they are used for optical systems, as in laser diode current control or for calibration of read/write heads as in magnetic disc drives.

ST4EC502 working principles

ST4EC502 uses the familiar rotary contact adjustment style. It functions as a rheostat and the rotating shaft determines the resistance by changing the relative position of two metallic contacts. When the shaft is moved from its rest or reference position to its maximum, the resistance between the two contacts increases proportionally, allowing for precise adjustment of the resistance value between 0.1Ω and 10KΩ.

In addition, the use of a three-point contact provides a contact force independent of its rotary position. This helps maintain an even contact force through the whole rotation of the shaft. Therefore, even when the shaft is adjusted, the contact force remains constant, ensuring the highest accuracy throughout the life of the product.

Conclusion

ST4EC502 is a reliable and accurate trimmer potentiometer from STMicroelectronics. It is designed to provide high-precision of adjustment in the range of 0.1Ω to 10KΩ. It is frequently used for the adjustment of amplified circuits, for battery charging current control, for gain control of amplifiers, and for optical systems. ST4EC502 uses a rotary contact adjustment style, while the three-point contact ensures the highest accuracy throughout the product\'s lifetime.

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