Q. Are there any precautions when adjusting the capacitance value?
Q. What are large-capacitance Trimmer Capacitors?
Q. Which Trimmer Capacitors have small minimum capacitance values?
Q. Which Trimmer Capacitors are recommended for high frequency ranges?
Q. Are there any precautions for land design?
Q. Can we use a soldering iron to mount the Trimmer Capacitor?
Q. Can an overcoat material or "Lock Paint" be applied?
Q. Can you ship Trimmer Capacitors with the angle and capacitance value preset?
Q. What is the "Setting drift"?
Q. Which Trimmer Capacitors can be reflow-soldered at a high temperature?
The trimmer capacitor is non-polarized. However, in some circuits, it is difficult to adjust the capacitance value due to stray capacitance such as that generated by a metallic screwdriver. The dimensions diagram shows the positive (hot) and negative (ground) terminals so that the negative (ground) terminal can be grounded to suppress any effects of stray capacitance in these circuits. When using an insulated screwdriver to adjust the capacitance value, you do not need to check the ground terminal. Even if the positive (hot) and negative (ground) terminals are incorrectly mounted, there are no effects.
Use a screwdriver suitable for the screwdriver slot on the trimmer capacitor. When an unsuitable or tip-worn screwdriver is used, adjustment may be difficult. Also, using a metal-tip screwdriver makes capacitance adjustment difficult due to stray capacitance. Use a ceramic-tipped screwdriver.
The force applied by the screwdriver should be 1.0N or less to reduce drift after capacitance adjustment. If a force of 5.0N or more is applied, the product may be damaged or fail to function properly.
The TZ03R121 Series has the biggest "Cmax" value (120pF) among our Trimmer Capacitors.
The 1.5pF type in the TZW4 Series has the smallest "Cmin" value (0.4pF) among our Trimmer Capacitors.
The TZY2, TZS2 and TZW4 Series provide high stability in high frequency ranges.
Employ our company's standard land pattern dimensions for the land pattern. Failure to do this may result in imperfect contact due to insufficient solder joint strength, solder bridging, or flux penetration into the inside of the trimmer capacitor.
All of our company's Trimmer Capacitors can be mounted using a soldering iron.
However, be sure to follow the precautions given below.
[Reference procedures for soldering TZS2/TZY2/TZV2/TZC3/TZW4 chip trimmer capacitor]
| Temperature of soldering iron tip | Within 350±10°C |
|---|---|
| Soldering time | Heat application to terminal must be within 3 seconds in total. |
| Diameter of soldering iron tip | 1mm or less |
| Capacity of soldering iron | 30W or less |
| Temperature of soldering iron tip | Within 350±10°C |
|---|---|
| Soldering time | Heat application to terminal must be within 3 seconds in total. |
| Diameter of soldering iron tip | 3mm or less |
| Capacity of soldering iron | 30W or less |
| Temperature of soldering iron tip | Within 350±10°C |
|---|---|
| Soldering time | Heat application to terminal must be within 3 seconds in total. |
| Diameter of soldering iron tip | 3mm or less |
| Capacity of soldering iron | 30W or less |
[Reference procedures for soldering TZS2/TZY2/TZV2/TZC3/TZW4 chip trimmer capacitor]
Procedure 1: Pre-soldering to the land for the positive (hot) terminal
(Precautions)
Supply solder so that the solder height is approximately half of the terminal height. Do not supply too much.
If the amount of supplied solder is excessively large, flux may penetrate into the inside of the trimmer capacitor.
Procedure 2: Preheating the pre-supplied solder
(Precautions)
Direct the soldering iron tip to the positive (hot) terminal, and sufficiently preheat the pre-supplied solder and land.
Insufficient preheating will cause soldering failure.
Procedure 3: Soldering the terminal
(Precautions)
Slide the trimmer capacitor toward the soldering iron tip, and heat the positive (hot) terminal (within 3s in total).
At this time, direct the iron tip perpendicularly to the positive (hot) terminal so that the iron tip touches the terminal. Do not bring the iron tip into contact with the trimmer capacitor body. Do not supply any additional solder.
Procedure 4: Cooling
(Precautions)
Fix and cool the trimmer capacitor until the solder has set.
If the trimmer capacitor is moved before the solder has set, dislocated soldering will occur.
Procedure 5: Soldering the negative (ground) terminal
(Precautions)
Direct the soldering iron tip perpendicularly to the negative (ground) terminal so that the iron tip touches the terminal, preheat the terminal and land, and then supply filiform solder. As in procedures 1 and 3 above, pay attention so that the amount of supplied solder is not excessively large.
If the amount of supplied solder is excessively large, trimmer adjustment failure may occur.
Neither an overcoat material nor "Lock Paint" can be applied. Do not apply any adhesive agent such as "Lock Paint" to the adjustment section (rotor) of the Trimmer Capacitors. In some applications, resin or rubber coating material is applied to a wide area on the circuit board to improve water resistance or environmental resistance. However, do not apply the material directly to the trimmer capacitor. If the material penetrates the inside of the trimmer capacitor, contact failure will occur, resulting in degradation of the characteristics.
When our Trimmer Capacitors are used correctly, the preset capacitance value hardly changes due to vibration or impact. It may be unnecessary to apply "Lock Paint" for vibration or impact suppression. For the test data on vibration characteristics, impact characteristics, and environmental resistance characteristics, contact us.
With the TZY2 and TZS2 Series, both the angle and capacitance value can be preset before shipment. With other products, only the angle can be preset before shipment. For details, contact us.
"Setting drift" means the change in capacitance value after adjustment. We have regarded the change 5 seconds after adjustment as the initial value, and have stipulated the ratio of the capacitance value change 24 hours after adjustment.
All of Murata's Trimmer Capacitors that are recommended for reflow soldering meet the requirements for high temperature reflow soldering.
| Pre-heating | 150 to 180°C | 60 to 120 sec. |
|---|---|---|
| Heating | 230°C | 30 to 50 sec. |
| Peak Temperature | 260 +5/-0°C | 1 sec. |
| Cycle of reflow | 2 time |
For a detailed answer to this question, please contact us.
The plant manufacturing the Trimmer Capacitors has been ISO9001, QS9000 and ISO14001-certified.
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