91ER20KLF

Series:	91
Part Status:	Active
Lead Free Status / RoHS Status:	--
Resistance:	20 kOhms
Power (Watts):	0.5W, 1/2W
Tolerance:	±20%
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:	Rectangular - 0.420" x 0.375" Face x 0.280" H (10.67mm x 9.53mm x 7.11mm)

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Introduction to Trimmer Potentiometers

Trimmer potentiometers are electronic devices consisting of three terminals, with a sliding or rotating contact that forms an adjustable voltage divider. This adjustable voltage divider enables the user to set the level of output potential energy, allowing for precise control of the voltage in a circuit. They are typically used in high-precision electronic applications as a means of adjusting circuit conditions, such as varying the cutoff frequency of an active filter, adjusting the gain in an amplifier circuit, or setting the offset in an analog-to-digital converter.

91ER20KLF Trimmer Potentiometer

The 91ER20KLF trimmer potentiometer is a miniature single-turn trimmer, designed for precision adjustment in high-density printed circuit boards. This particular trimmer is a vertical-mount device, and measures a compact 11.2 x 6.8 x 5mm in size. The design ensures that the device will fit into most PCBs, without taking up too much space. It has a minimum resistance of 20 kΩ and a tolerance of ±20%, making it suitable for many precise adjustment applications.The 91ER20KLF is a linear device, with 6mm three-terminal knobs, and contacts that are rated for 1,000,000 operations. It is constructed of polypropylene-oxide and has a contact resistance of 100 mΩ. It is also external code-protected and integrated with dual-lock protection to ensure the value stays consistent.

Application Fields and Operating Principle

Trimmer potentiometers such as the 91ER20KLF have numerous applications. For instance, they are often used in motor-speed control circuits, flow-measurement instruments, latching relays, and IR sensors.The basic operating principle of the 91ER20KLF is as follows: it is constructed with three pins, a common, wiper (or slider) and end-point. When the wiper is adjusted along the resistance track, the output voltage corresponding to the resistance between common and wiper is generated. And, the value of the output voltage can be changed by adjusting the position of the wiper along the resistance track.In summary, the 91ER20KLF trimmer potentiometer is a miniature and precise electronic device suitable for many adjustment applications, due to its adjustable voltage divider. It is constructed with three pins, a common, wiper and end-point, and when the wiper is adjusted along the resistance track, the output voltage corresponding to the resistance between common and wiper is generated.Typical applications for the 91ER20LFK trimmer include motor-speed control circuits, flow-measurement instruments, latching relays, and IR sensors. The design ensures that the trimmer will fit into most PCBs, without taking up too much space. It is constructed of polypropylene-oxide and has a contact resistance of 100 mΩ, allowing for a precise and adjustable output voltage.

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