VTS18CH8 Megastar Electronics Inc., VTS18CH8 Datasheet - Page 4

• Manufacturer Part Number: VTS18CH8
• Description: Smd Transient Voltage Suppressors Vts Series - Ch Type
• Manufacturer: Megastar Electronics Inc.

4. IR soldering
5. Hand soldering
* Perform adequate test in advance as the reflow temperature profile will vary according to the conditions of the manufacturing
Soldering recommendations (continued)
process, and the specification of the reflow furnace.
In hand soldering of the varistors, large temperature gradient between the pre-heated varistor and the tip of the soldering iron
may cause electrical failures and mechanical damages such as crackings or breakings or the devices. The soldering shall be
carefully controlled and carried out so that the temperature gradient is kept minimum with following recommended conditions
for hand soldering.
5.1 Recommended soldering condition 1
(1) Solder
(2) Pre-heating
(3) Soldering iron
(4) Cooling
5.2 Recommended soldering condition 2 (without pre-heating)
(1) Solder iron tip shall not directly touch to ceramic dielectrics.
(2) Solder iron tip shall be fully pre-heated before soldering while soldering iron tip to the external electrode of varistors.
Rapid heating, partial heating or rapid cooling will easily cause defect of the component. So pre-heating and gradual cooling
process is suggested. IR soldering has the highest yields due to controlled heating rates and solder liquidus times. Make sure
that the element is not subjected to a thermal gradient steeper than 4 degrees per second. 2 degrees per second is the ideal
gradient. During the soldering process, pre-heating to within 100 degrees of the solders peak temperature is essential to mini-
mize thermal shock.
1mm thread solder (sn63:pb37) with soldering flux in the core.
Rosin-based and non-activated flux is recommended.
The varistors shall be pre-heated so that temperature gradient between the devices and the tip of soldering iron is 150°C or
below.
Rated power of 20x max with 3mm soldering tip in diameter.
Temperature of soldering iron tip 300°C max. (The required amount of solder shall be melted in advance on the soldering
tip.)
After soldering, the varistors shall be cooled gradually at room ambient temperature.
SMD Transient Voltage Suppressors
(a) Pre-heat
(b) Heating
(c) Cooling
1. The temperature rising speed is suggested to be 2~4°C.
2. Appropriate pre-heat time will be from 60 to 120 seconds.
1. Careful about sudden rise in temperature as it may worsen
2. Set the peak temperature in the range from 215 to 225°C.
1. Careful about slow cooling as it may cause the position shift
the solderabaility.
of component.
VTS Series - CH Type