ST7TA104

Series:	ST7
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Resistance:	100 kOhms
Power (Watts):	0.25W, 1/4W
Tolerance:	±20%
Temperature Coefficient:	±100ppm/°C
Number of Turns:	3
Adjustment Type:	Top Adjustment
Resistive Material:	Cermet
Mounting Type:	Surface Mount
Termination Style:	J Lead
Size / Dimension:	Square - 0.252" x 0.240" Face x 0.134" H (6.40mm x 6.10mm x 3.40mm)

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Introduction to Trimmer Potentiometers

Trimmer potentiometers, also known as trimpots, are tiny variable resistors that are primarily used for alignment of electronic circuits. Typically, they are used for variable resistor functions in low-power electronic circuits such as small amplifiers and motor control circuits. Common uses for these types of resistors include: battery-powered outdoor lighting, fader control for audio systems, adjusting voltage regulators, setting the gain on amplifiers, and amplifier tuning. The ST7TA1040 is a Low Power and High Precision trimmer. It is a three-terminal single-turn, variable resistor package. This device contains a carbon film resistive element housed in a molded plastic casing with mating plastic with a built-in flat round-ended shaft. The resistor body is 0.60" long and 0.10" wide, and the shaft is 0.50" long and 0.05" in diameter.

Application Field of ST7TA104

The ST7TA104 is very useful and commonly used in both consumer and industrial applications. It is primarily used for controlling high voltage and current in battery-powered devices, such as iPhones and Android smartphones. On most of these devices, a trimmer potentiometer can be found to adjust the LCD brightness or regulate the charging current depending on the device. The ST7TA104 is most commonly used to adjust resistors in small power supplies, amplifier stages, or test circuits. Other common applications include setting the bias in control systems, balancing the gain in analog signals, matching technical features in communication circuits. Also, they are used to adjust the level of voltage regulators, monitor currents levels in circuits, tune audio amplifiers, setting the gain of radio frequency amplifiers, and much more.

Working Principle of ST7TA104

The working principle of the ST7TA104 is quite simple. It is made of a resistive element, usually a carbon film, which is wrapped around a spindle (or shaft). The resistive element is connected to three pins: one pin is referred to as the “common” pin, which is the connection point between the other two. The other two pins are then connected to either side of the resistor. When the spindle is turned, the resistive element is shortened and its resistance decreases. When the spindle is turned the other way, the resistive element lengthens, and its resistance increases.The mechanism of the trimmer potentiometer is manually adjustable, meaning the resistance can be adjusted by simply turning the spindle. This makes it a very useful device in a variety of electronic systems, as it allows small adjustments to be made in complex or sensitive systems that would be difficult to precisely adjust with other components.

Conclusion

The ST7TA104 is an excellent choice for applications that require precise adjustment. Through its easy-to-use design and its adjustable nature, it is an essential component in many electronic systems. While its application is mostly found in the consumer sector, the ST7TA104 is also widely used in industrial fields, as it can be used to precisely fine-tune precise circuitry. Moreover, the ST7TA104 is both low-power and high precision, making it even more attractive for use in sensitive applications.

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