TM7EX102

Trimmer Potentiometers

Trimmer potentiometers, also known as trimpots, are variable resistors that are mechanically adjusted rather than electronically, allowing for easy incremental rotation of a knob to adjust the level of resistance ¹. When a trimmer is selected for a design, it is important to understand how exactly the TM7EX102 model works and where it is best applied in order to maximize its potential in that particular product.

Application field

The TM7EX102 trimmer pot is an SMD top adjust trimpot, measuring 7mmx5mmx2.5mm in size and constructed from plastic and ceramics. It operates with a resistance range of 10-500uOhm (100-100pF) and offers a maximum power dissipation of 2W. It features 6 terminals –3 leads, 2 soldering tabs, and a spindle adjustment– and is typically employed in RF filtering, such as an attenuator or low pass filter.

The TM7EX102 trimpot is ideal for applications in the telecommunications industry, providing optimal resistance-to-size ratios for small residential and industrial-grade devices. Examples of this can be seen in the production of telephones, wifi routers, and telecom hubs. Additionally, it is also widely used for the production of attenuators, bridges, and inductors owing to its aforementioned power dissipation and size capacities.

Working principle

When the spindle of the trimmna is rotated, the ceramic shaft is moved in the axial direction, changing the resistance of the resistor element. The knob control feature offers either a continuous resistance or resistance step adjustment. By consistently applying a voltage to the two outside leads, current is allowed to flow through the resistor element, beginning from the voltage source to the middle circulating lead.

As the spindle is turned, the amount of resistance is altered, increasing or decreasing the amount of current that can pass through the trimpot. The two outside leads are clamped and connected to a resistance adjuster, while the center lead is wired to a reference potential. It should be noted that no current flows through the adjuster itself.

The use of a 6-piece terminal-connector provides connection of all elements necessary for a stable voltage and current control, featuring a clamp, adjuster, and resistor.It is this system of components that manage to offer an economical, significant and adjustable resistance option in the face of a miniature form factor, offering greater flexibility and adaptability in the design of specific applications.

Conclusion

In conclusion, the TM7EX102 trimmer pot is an SMD top adjust trimpot that is ideal for RF filtering and the smartphone production. It offers resistance levels of 10-500uOhm, a maximum power dissipation of 2W, and a 6-piece terminal-connector for stable voltages and currents. Through the adjustment of the spindle, it is able to adjust the amount of current passing through the trimmer pot according to the resistance step required for the application.