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SCA10X0

Assembly Instructions for SCA6x0 and SCA10x0 series

VTI technologies 

Assembly Instructions for SCA6x0 and SCA10x0 series

TN71

7 Rework Guidelines

If it becomes necessary to rework a SCA6x0/SCA10x0 series

component, the preferred way to remove the component is by hot

air. Use of a hot air rework station with a vacuum chuck, is the

preferred method. A key issue in using hot-air is preventing

thermal damage to the component or adjacent components.

If hot air rework station is not available, rework with thermal

tweezers is also an acceptable alternative. This method is used at

VTI e.g. for failure analysis purposes. This technical note

describes VTI's rework procedure.

Removing of the component with hot iron only is difficult as it is easy to get the part too hot and

destroy it. It is not recommend method if failure analysis or re-use of the component is desired.

7.1 Instructions for desoldering and removing of component

Soldering Station (Pace SensaTemp ST25E-PS90) and thermal

tweezers (Pace Thermotweez) with Pace 1121-0416-P1 tool head are

used for de-soldering and removing of the component.

Figure 11. Thermal tweezers, Pace Thermotweez Figure 12: Tool head, Pace 1121-0416-P1

The plastic molding compound on the component is LCP (liquid crystal polymer) which withstands

very high temperatures and is good material for Pb-free assembly. LCP's melting point is 335ºC.

However, the mechanical properties start to change already near 280ºC. If the pins are heated too

long the plastic around pin will be softened and if there at the same time is some stress on the pin

there is a risk that pin might move and cause increased reliability or wirebond break inside housing.

In order to melt all pins simultaneously, tweezers are recommended for de-soldering of the

component. Also with tweezers, special care must be taken if failure analysis or re-use of the

component is desired.

In the component removal process, the temperature setting in soldering station is normally +315ºC.

The temperature on the tip of the tool is 270...275ºC. Tool is pressed against pins only for few

seconds. Same temperature is used both for Pb-free and SnPb-solder joints, even though SnPb

solders melt already below 200ºC. Some temperature adjustment might be needed. Especially if

tool head is old and 'dirty' temperature needs to be increased.

VTI Technologies Oy

www.vti.fi

10/12

Rev.1.0

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