Matters to Be Observed When Using This Product

■ When the capacitor is mounted on a multilayer board or has copper leads, the internal temperature of the capacitor

readily increases because of the high heat conductivity of the copper leads, and therefore the capacitor temperature

may rise above the mounting heat-resistant temperature. In such a case, contact us for some advice.

■ Excessive heat stress that is applied to the capacitor during

the mounting process causes the dielectric film to thermally

shrink, which may make the connection of the metal-sprayed

part unstable. Current flowing through the capacitor in this

state may reduce its capacitance and put it in open mode.

When the capacitor is laid down on its side on the board,

solder the capacitor so that a thermocouple inserted

between the capacitor and the board shows 125 ℃ or lower.

■ When using a chip-type capacitor, measure the temperature profile of the mounted capacitor by the following method

so that the capacitor is soldered at a temperature equal to or lower than the heat-resistant temperature.

<Creating a measurement sample>

Bond a thermocouple (ø 0.1 T) to the upper surface of the capacitor with an adhesive.

<Measuring a temperature profile>

As shown in the following diagram, connect the same type of thermocouple (3 m to 4 m) as the thermocouple

bonded to the capacitor, to the measuring device.

Mount the sample capacitor on the board, subject the capacitor to the soldering process, and measure the

temperature profile of the capacitor.

■ When using a lead-type capacitor with a low mounting heat-resistant temperature, measure the temperature profile

of the mounted capacitor by the following method so that the capacitor is soldered at a temperature equal to or lower

than the heat-resistant temperature.

<Creating a measurement sample>

Drill a hole of 0.3 mm to 0.8 mm in diameter on the top of the capacitor, the hole being deep enough to reach

the central part of the capacitor, and insert a thermocouple (ø 0.1 T) in the hole, affix the thermocouple with

an adhesive.

<Measuring a temperature profile>

As shown in the following diagram, connect the same type of thermocouple (3 m to 4 m) as the thermocouple

bonded to the capacitor, to the measuring device.

Mount the sample capacitor on the board, subject the capacitor to the soldering process, and measure the

temperature profile of the capacitor.

23-Apr-25

　 Mounting conditions (temperature measurement)

Thermocouple (ø 0.1)

Measurement point

Capacitor

Printed circuit board

Capacitor

Adhesive

Thermocouple

Measuring device

3 m to 4 m

Capacitor

3 m to 4 m

Thermocouple

Circuit board

Measuring device

(thin wire)

ø 0.1