■Soldering and Mounting

1.PCB Design

1. Notice for Pattern Forms

1-1. Unlike leaded components, chip components are susceptible to flexing stresses since they are mounted directly on the substrate.

They are also more sensitive to mechanical and thermal stresses than leaded components.

Excess solder fillet height can multiply these stresses and cause chip cracking.

When designing substrates, take land patterns and dimensions into consideration to eliminate the possibility of excess solder fillet height.

1-2. There is a possibility of chip cracking caused by PCB expansion/contraction with heat, because stress on a chip is different depending on PCB material and structure.

When the thermal expansion coefficient greatly differs between the board used for mounting and the chip,it will cause cracking of the chip due to the thermal expansion and contraction.

When capacitors are mounted on a fluorine resin printed circuit board or on a single-layered glass epoxy board, it may also cause cracking of the chip for the same reason.

Pattern Forms

in section

in section

in section

in section

in section

in section

Prohibited

Correct

Placing Close to

Chassis

Placing of Chip

Components

and Leaded

Components

Placing of Leaded

Components after

Chip Component

Lateral Mounting

Chassis

Solder (ground)

Electrode Pattern

Solder Resist

Lead Wire

Solder Resist

Lead Wire

Soldering Iron

Solder Resist

ｿﾙﾀﾞﾚｼﾞｽﾄ

Solder Resist

GRM188C71A105MA12-01A