Series:	SM4
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Resistance:	2 kOhms
Power (Watts):	0.25W, 1/4W
Tolerance:	±10%
Temperature Coefficient:	±100ppm/°C
Number of Turns:	12
Adjustment Type:	Side Adjustment
Resistive Material:	Cermet
Mounting Type:	Surface Mount
Termination Style:	J Lead
Size / Dimension:	Rectangular - 0.193" x 0.146" Face x 0.146" H (4.90mm x 3.70mm x 3.70mm)

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Trimmer Potentiometers: SM4A202 application field and working principle

Trimmer potentiometers are small devices used to control resistance values in relatively small circuits with accuracy. They are also known as trimmers and are commonly used to adjust large-scale integrated circuits (LSIs). Trimmer potentiometers come in various shapes and sizes, and their use cases are vast. The SM4A202, in particular, is a particularly small yet features-rich trimmer potentiometer made of plastic.The SM4A202 is typically used in control applications that require precision resistance adjustment and in circuits that need to be miniaturized, such as when making test equipment, instrumentation, or miniature control systems. Its range of applications includes: audio circuit adjustment; potentiometer repair; robotic arm control systems; communications control; and various electronic games.The SM4A202 features a capacitance variation gap, segment-control contact, single turn potentiometer, switchable resistor, plastic-based element insulation, and screw adjustment. This makes it suitable for both high current and high-frequency applications. Its value range is from 0.5 ohm to 5Kohm. This trimmer can also be purchased in a variety of resistance values for specific applications.The SM4A202 is composed of two distinct parts: the “element” and the “dial”. The element is the contact section, which is a conductive metal in a coil form. The dial, which consists of a dial terminal and shaft, is used to adjust the resistance. The central electrode of the contact section is connected to the metal shaft, and the resistance between two sides of the contact section is determined by turning the shaft. The SM4A202 has the capacity to adjust up to 500 ohms of resistance.The working principle of the SM4A202 is relatively simple. A small torsion spring is fitted between the element and the dial which allows the dial to be turned. Turning the dial sets the resistance which is then read off by the tester. This simple mechanism makes the SM4A202 a great choice for circuits which require fine resistance adjustments.In conclusion, the SM4A202 is a great choice for circuits requiring fine resistance adjustment. Its small form factor and great range of values makes it suitable for a variety of applications. Its use of a central electrode, metal shaft, and torsion spring are what make it so effective at making the adjustments so precisely.

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Part Number	Manufacturer	Price	Quantity	Description