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- We incorrectly mounted the
positive (hot) and negative (ground) terminals. Will there be any
problem?
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.
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- Are there any precautions when
adjusting the capacitance value?
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 1.0 N or less to reduce
drift after capacitance adjustment. If a force of 5.0 N or more is
applied, the product may be damaged or fail to function properly.
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- What are large-capacitance
trimmer capacitors?
The TZ03R121
series has the biggest "Cmax" value (120 pF) among our trimmer
capacitors.
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- Which trimmer capacitors have
small minimum capacitance values?
The 1.5 pF type in the TZW4
Series has the smallest "Cmin" value (0.4 pF) among our trimmer
capacitors.
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- Which trimmer capacitors are
recommended for high frequency ranges?
The TZY2, TZS2 and TZW4 series provide high stability in high frequency ranges.
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- Are there any precautions for
land design?
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.
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- Can we use a soldering iron to
mount 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.
 TZS2/TZY2/TZV2/TZC3/TZW4
- Use filiform solder with a chlorine content of
0.5 weight-percent or less.
- Supply filiform solder to the bottom of the
terminal so that the solder area is 0.5 to 2 mm in diameter or less.
Pay attention so that flux is not applied to any part other than the
terminal. If the amount of supplied solder is excessively large or is
supplied to the upper part of the terminal, flux or solder may
penetrate into the moving parts, possibly freezing the rotor or
resulting in imperfect contact.
Moreover, pay attention so that the soldering iron tip does not touch
the stator, otherwise the stator may be damaged. (Reference
procedures)
| 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 |
: |
1 mm or less |
| Capacity of soldering iron |
: |
30 W or less |
TZB4
- Use filiform solder with a chlorine content of
0.5 weight-percent or less
- Supply filiform solder to the bottom of the
terminal. Pay attention so that flux is not applied to any part other
than the terminal. If the amount of supplied solder is excessively
large or is supplied to the upper part of the terminal, flux or solder
may penetrate into the moving parts, possibly freezing the metal rotor
or resulting in imperfect contact. Moreover, pay attention so that the
soldering iron tip does not touch the resin casing, otherwise the
casing may be damaged.
| 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 |
: |
3 mm or less |
| Capacity of soldering iron |
: |
30 W or less |
TZ03
- Use filiform solder with a chlorine content of
0.5 weight-percent or less.
- Pay attention so that the amount of supplied
solder is neither excessively small nor large. If the amount is
excessively small, insufficient solder joint strength will occur. If
the amount is excessively large, solder bridging will occur.
- Pay attention so that the soldering iron tip does
not touch the resin casing, otherwise the casing may be damaged.
| 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 |
: |
3 mm or less |
| Capacity of soldering iron |
: |
30 W 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. |
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|
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 3 s 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. |
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|
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. |
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|
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. |
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- Can an overcoat material or
"Lock Paint" be applied?
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.
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- Can you ship trimmer capacitors
with the angle and capacitance value preset?
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.
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- What is the "Setting drift"?
"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.
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- Which trimmer capacitors can be reflow-soldered at a high temperature?
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 |
|
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- Are any environmentally
hazardous materials used?
For a detailed answer to this question, please contact us.
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- Do you have any public
certifications?
The plant manufacturing the trimmer capacitors has been ISO9001, QS9000
and ISO14001-certified.
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