3386U-1-203RLF

Series:	Trimpot® 3386 - Sealed
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Resistance:	20 kOhms
Power (Watts):	0.5W, 1/2W
Tolerance:	±10%
Temperature Coefficient:	±100ppm/°C
Number of Turns:	1
Adjustment Type:	Top Adjustment
Resistive Material:	Cermet
Mounting Type:	Through Hole
Termination Style:	PC Pins
Size / Dimension:	Square - 0.375" x 0.375" Face x 0.190" H (9.53mm x 9.53mm x 4.83mm)

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Introduction

Trimmer potentiometers are adjustable resistors used as precision voltage and current controls. The most common form of trimmer potentiometer is the 3386U-1-203RLF, a miniature through-hole version. It consists of a rotational contact on top of a semicircular resistance track connected between two terminals, with adjustable resistances controlled by turning a center shaft. This type of potentiometer is particularly useful in applications where electrical contacts are needed that are lost or damaged frequently.

Application Fields

The 3386U-1-203RLF trimmer potentiometer is most suitable for uses in applications where precision voltage or current adjustments are needed, such as servo controls, robotics, and audio equipment, to name a few. It is also used in electronic test and equipment instrumentation, especially for controls which must stay in a certain calibrated setting for a long time.

Working Principle

The operation of a trimmer potentiometer is based on the principle of a variable resistor. The resistance of the RT is determined by the position of the contact and can be controlled by turning the shaft. The resistance is proportional to the angle of rotation and can be adjusted to a wide variety of resistance values.When an electrical signal is applied to the two terminals, the voltage is higher at the terminal closest to the contact and lower at the terminal farthest from the contact. This voltage difference across the RT corresponds to the current travelling through it, thus setting the output voltage. By adjusting the position of the contact the voltage output can be accurately adjusted.

Components Elements

The main components of the 3386U-1-203RLF trimmer potentiometer are the resistance track (RT), the rotational contact, and the center shaft. The resistance track is a semicircular track consisting of a resistor material, which has a resistance value determined by the length and width of the track. The rotational contact is a conductive metal plate that is adjusted to contact the resistance track in different locations and has the ability to move freely in one direction. The center shaft connects the rotational contact to the switch, allowing for the adjustment of the resistance.

Advantages

The 3386U-1-203RLF trimmer potentiometer has several advantages, such as its small size, which allows it to be used in tight or confined spaces, as well as its robust construction which ensures reliable operation even in demanding conditions. In addition, the resistance tracks are highly precise and accurate, allowing for very fine adjustments of the voltage and current. The relatively low cost of the trimmer potentiometer also makes it an attractive choice for many applications.

Disadvantages

The main disadvantage of the trimmer potentiometer is its relatively high contact resistance. This is because the resistance of the RT is determined by the contact area and the size of the track. The drawback is that this can lead to an increase in noise and an unpredictable change in output voltage and current. In addition, the contact tend to experience wear and tear over time, which can lead to instability in the operation of the potentiometer.

Conclusion

In conclusion, the 3386U-1-203RLF trimmer potentiometer is a highly useful component for a wide range of applications, offering precise voltage and current control. Its small size and robust construction makes it the ideal choice for many applications. However, due to its relatively high contact resistance and contact wear and tear, it should only be used when a highly accurate and reliable voltage and current setting must be maintained for a prolonged period of time.

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