Surface Mount Multilayer Varistor

6 / 8

@SOCAY Electronics Co., Ltd. 2013

Specifications are subject to change without notice.

Please refer to www.socay.com for current information.

SC0805ML - SC2220ML Series

SOCAY Electronics Co., Ltd.

www.socay.com

(a) Preheat

1. The temperature rising speed is suggested to be

2~4

ºC /s

2.

Appropriate preheat time will be from 60 to 120

seconds.

(b) Heating

1. Careful about sudden rise in temperture as it may

worser the solder ability.

2.

Set the peal temperature in the range from 215

ºC

to 225

ºC.

(c) Cooling

1. Careful about slow cooling as it may cause the

position shift of component.

l Hand Soldering

In hand soldering of the varistors. Large temperature gradient between preheated the varistors and the tip of soldering iron

may cause electrical failures and mechanical damages such as cracking or breakings of 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.

(a) Recommended Soldering Condition 1

1. Solder：

1mm Thread solder (sn63:pb37) with soldering flux in the core.

Rosin-based and non-activated flux is recommended.

2. Preheating

The varistors shall be preheated so that Temperature Gradient between the devices and the tip of soldering iron is

150

ºC or below.

3. Soldering Iron

Rated Power of 20w max with 3mm soldering tip in diameter.

Temperature of soldering iron tip 300C max ( The required amount of solder shall be melted in advance on the

soldering tip.)

4. Cooling

After soldering. The varistors shall be cooled gradually at room ambient temperature.

(b) Recommended Soldering Condition 2（Without preheating）

1. Solder iron tip shall not directly touch to ceramic dielectrics.

2. Solder iron tip shall be fully preheated before soldering while soldering iron tip to the external electrode of varistors.

l Post Soldering Cleaning

(a) Residues of corrosive soldering fluxes on the PC board after cleaning may greatly have

influences on the electrical

characteristic and the reliability (such as humidity resistance) of the varistors which have been mounted on

the board. It shall be confirmed that the characteristic and the reliability of the devices are not affected by the

applied cleaning conditions.

(b) When an ultrasonic cleaning is applied to the mounted varistors on PC Boards. Following

conditions are recommended

for preventing failures or damages of the devices due to the large vibration energy and the resonance caused

by the ultrasonic waves.

1. Frequency 29MHz max

2. Radiated Power 20w/lithr max

3. Period 5minuets max

Soldering Recommendations

(Continue)

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

200

150

100

50

0

250

Time (Minutes)

Max. temperature 225

ºC

Seconds above

solder melting point

45-80

Ramp rate <2

ºC /s

Preheat dwell

Preheat zone