PTC Thermistors POSISTOR ® for Circuit Protection - Murata
PTC Thermistors POSISTOR ® for Circuit Protection - Murata
PTC Thermistors POSISTOR ® for Circuit Protection - Murata
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!Note • Please read rating and !CAUTION (<strong>for</strong> storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.<br />
• This catalog has only typical specifications. There<strong>for</strong>e, please approve our product specifi cations or transact the approval sheet <strong>for</strong> product specifi cations be<strong>for</strong>e ordering.<br />
R90E.pdf<br />
Sep.24,2012<br />
!Caution/Notice<br />
Continued from the preceding page.<br />
(2) Allowable Soldering Temperature and Time<br />
(a) Solder within the temperature and time<br />
combinations, indicated by the slanted lines in the<br />
graphs at right.<br />
(b) Excessive soldering conditions may cause<br />
dissolution of metallization or deterioration of<br />
solder-wetting on the external electrode.<br />
(c) In the case of repeated soldering, the accumulated<br />
soldering time should be within the range shown at<br />
right. (For example, Reflow peak temperature: 260°C,<br />
twice –> The accumulated soldering time at 260°C is<br />
within 15sec.)<br />
Allowable Reflow Soldering Temp. and Time<br />
Temperature (°C)<br />
270<br />
260<br />
250<br />
240<br />
230<br />
220<br />
210<br />
200<br />
0 10 20 30 40 50 60<br />
Time (second)<br />
(3) Standard Temperature Profile <strong>for</strong> Soldering<br />
(a) Insufficient preheating may cause a crack on the<br />
ceramic body. The difference between preheating<br />
temperature and maximum temperature in the profile<br />
should be 100°C.<br />
(b) Rapid cooling by dipping in solvent or by other<br />
means is not recommended.<br />
Reflow Soldering Conditions<br />
Temperature (°C)<br />
Preheating (in air)<br />
200<br />
100<br />
Soldering<br />
240°C<br />
Gradual cooling<br />
(in air)<br />
0<br />
1 to 2 min.<br />
*20 sec.<br />
Preheating: 150±10°C, 1 to 2 minutes<br />
Soldering: 240°C, 20 sec.<br />
* In the case of repeated soldering, the accumulated soldering<br />
time should be within the range shown in "(2) Allowable<br />
Soldering Temperature and Time."<br />
(4) There may be a risk of unexpected failures<br />
(tombstone, insufficient solder-wetting, etc.) in the<br />
mounting process, caused by the mounting conditions.<br />
Please make sure that this product is correctly<br />
mounted under the specified mounting conditions.<br />
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