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Keywords: Trimmer capacitors, JKA, jb Capacitors

JKA SMD Ceramic Trimmer Capacitors, it is one of the hottest product on markets now.
We keep safety stock for below popular values. we can replace of Murata with much better price.
And for some urgent orders, we can meet your delivery date requirement.
For more information, please contact with our sales immediately at info@jbCapacitors.com

JKA3M03T
JKA3M06T
JKA3M10T
JKA3M20T
JKA3M30T

Recently we win some good orders for JKA SMD Ceramic Trimmer Capacitors, now we would like to tell you more about JKA series application.

JKA - SMD Ceramic Trimmer Capacitor 3mm
Widely Applications:
• Cordless Phone, Wireless Repeater
• Two-Way Radio Communication (FRS, GMRS, LMR)
• Remote Keyless Entry System, Measuring Instrument
• Car Alarm Remote Controller, Car Audio, Traffic Card Reader
• Security System, Wireless Microphone
• TCXO, VCXO, RF Module, RFID, DVD

If you use such type capacitors, welcome you contact our sales team asap. 

Recently the market lack of SMD Ceramic Trimmer Capacitor very much, and the delivery time is very long. 
We keep some stock for this series, and make sure high quality. Are you looking for this item? Please contact us asap.

JKA - SMD Ceramic Trimmer Capacitor 
Features:
• Ultra miniature size with external dimensions of 3.2(W) x 4.5(L) x 1.5(T)mm
• Color coded case permits easy identification
• Very good Q and high resonant frequency
• Designed for reflow soldering
• Lowest capacitance drift
• Sealed construction prevents the penetration of Flux and Dust

A trimmer capacitor is a variable capacitor used for initial calibration and recalibration of equipment. It is commonly mounted directly on a PCB and accessed only by professional repairmen, not the end-user.

Characteristics
Voltage rating, capacitance range, polarity.
Trimmer capacitors can be rated for voltages up to 300 volts, although voltage ratings of up to 100 volts are much more common. Since trim caps are variable capacitors, they come in a capacitance range rather than a
single capacitance value. The minimum capacitance is usually between 0.5 pF and 10 pF, while the maximum capacitance is usually between 1 pF and 120 pF. The actual capacitance value can be varied between the
minimum and maximum capacitance values for a given trimmer capacitor, but it can never be set to zero. It is worth noting that trimmer capacitors are not polarized.

Tolerances and accuracy
Trimmer capacitors do not boast a good capacitance value tolerance. Sometimes, the tolerances can be as high as -0 to +100%. This means that a trimmer capacitor can have a maximum capacitance two times larger
than nominal. However, bad tolerances do not pose a great problem to engineers because trimmer capacitors are variable. Even if the maximum value is different between individual capacitors, they can still be set by turning the screwdriver a certain angle. Accuracy depends mostly on the operator, as he can choose to spend more time in order to set the capacitor to a desired value. Often, trimmer capacitors are set by robots instead of human operators, and they can achieve much better precision. In order to achieve a better accuracy, it is advised to use a non-metallic tool, since metal screwdrivers will introduce a source of capacitance that will vary the capacitance value when the tool is moved away from the capacitor.

Construction and properties of trimmer capacitors
There are two types of trimmer capacitors: air trimmer capacitor and ceramic trimmer capacitor. These two types use different materials as the dielectric. Both types use rotating action to change the capacitance value.
The construction of trimmer capacitors is similar to the construction of their larger variant, the variable capacitor. Trimmer capacitors can be made of semi-circular metal plates. One is fixed, while the other can be rotated using a screwdriver. The user changes the capacitance by rotating the shaft and increasing or reducing the amount of overlap between the two plates. Gear mechanisms may be used to improve the precision by allowing multiple turns between the lowest and highest settings.

Another way to make a trimmer capacitor is to place a metallic screw in a non-conductive threaded cylinder. The screw represents one electrode, while the other is located at the base of the cylinder. By rotating the screw, the distance between the two plates is varied which results in a change of capacitance. This construction is used in RF and microwave applications. 

The Ceramic Trimmer Capacitors where capacitance value can be changed by a mechanical adjustment and are mainly used in tuning circuits. Those are providing a solution to the demand for very accurate fixed capacitors and easy to install on the surface of the circuit board.

jb JKA SMD Ceramic Trimmer Capacitors with the appearance of new trimmer applications in the latest wireless personal-communications devices （cell phone）.In future, people will increase demand for JKA ceramic Trimmer (fine-tuning) capacitors with the popularity of the digital market.

SMD Ceramic Trimmer Capacitors are variable capacitors, they are used to initial set oscillator frequency values, latencies, rise and fall times and other variables in a circuit. Now repairmen re-calibrate equipment via trimmer capacitors when needed and commonly mounted directly on a PCB.

JKA Trimmer Capacitors dielectric material made by ceramic, have color coded stator permits for identification of capacitance, and can withstand reflow soldering temperatures.