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Assembly Instructions for SCA6x0 and SCA10x0 series 

                                                                                                                                                                                                                         TN71 

 
VTI Technologies Oy 

 

11/12 

www.vti.fi  Rev.1.0 

 
 
 
 
 
 
 
 
 
 
 
 

 

 

 
 
 
 
 

 

Remove the solder from the PCB using either a solder vacuum or solder braid making sure to clean 
the area of solder thoroughly. 

 

 
 
 
 
 
 
 
 
 
 

 
Figure 15.

 

Soldering iron and solder braid used for solder removal. 

 

Note that the performance and the reliability of the reworked component may have 
decreased due to the rework operation! VTI does not recommend rework. 
 

 

 
 

8 Environmental 

Aspects 

VTI Technologies respects environmental values and thus, its DIL packages are lead-free and 
RoHS compatible. VTI Technologies’ sensors should be soldered with lead-free solders in order to 
guarantee full RoHS compatibility.  

 

9 References 

JEDEC / Electronic Industries Alliance, Inc. Moisture/ReflowSensitivity Classification for Non-
Hermetic Solid State Surface Mount Devices (J-STD-020C).  
 
Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices 
(IPC/JEDEC J-STD-033).

 

 

Figure 13. 

Tool head is carefully pressed 

around component and kept in this 
position for few seconds.

                          

Figure 14.

  Immediately after solder 

melting, component is this lifted. 

Summary of Contents for 551-1013-2

Page 1: ...out 5 5 2 Solder paste and Cleaning process 5 5 3 Stencil 6 5 4 Paste printing 6 5 5 Component picking and placement 6 5 6 Reflow soldering 6 5 7 Moisture sensitivity level MSL classification 7 5 8 Inspection 8 6 Hand Soldering Guidelines 9 7 Rework Guidelines 10 7 1 Instructions for desoldering and removing of component 10 8 Environmental Aspects 11 9 References 11 10 Document Change Control 12 A...

Page 2: ...e applications 2 VTI S DIL 8 and DIL 12 packages The SCA6x0 and SCA10x0 series products are SMD DIL 8 DIL 12 components pick and place mountable and reflow solderable These components are completely lead free and designed to meet the demanding lead free soldering processes The package consists of a pre molded plastic housing with a copper based lead frame having gull wing type of leg pins on the s...

Page 3: ... in Figure 3 Figure 3 Outline and dimensions for DIL 12 package 4 Tape and reel specifications Packing tape dimensions are presented in figure 4 The unreeling direction and component polarity on tape are presented in figure 5 Reel dimensions are presented in figure 6 Figure 4 Packing tape dimensions for the DIL 8 and DIL 12 package All dimensions in millimeters mm ...

Page 4: ...y 4 12 www vti fi Rev 1 0 Figure 5 Package orientation on the tape and unreeling direction on tape A W Nmin W1 W2max M 330 24 102 24 4 2 30 4 Ø13 0 0 25 Figure 6 Reel dimensions All dimensions in millimeters mm Direction of unreeling PIN 1 IDENTIFIER DRAWING FOR REFERENCE ONLY ...

Page 5: ...with lead free SAC tin silver copper solder The SAC solder paste composition should be near eutectic The melting point of lead free SAC solder can vary between 217 221ºC depending on the composition of solder alloy In order to guarantee full RoHS compatibility lead free solder should be used for the soldering of VTI s DIL component Also traditional eutectic SnPb solder can be used for soldering th...

Page 6: ...nozzle is used Pick up nozzles are available in various sizes and shapes to suit a variety of different component geometries VTI s DIL packages are relatively large and heavy and on the other hand accelerometers require as accurate positioning as possible For this reason it is recommended that different pick up nozzles are tested to find the best one The polarity of the part must be assured in tap...

Page 7: ... should be in contact with DIL component s solder joint and others to the appropriate spots on a circuit board e g corner center bottom of the board etc The reflow profile should be adjusted according to the measured data so that each solder joint experiences an optimal reflow profile The temperature gradient should be as small as possible across the circuit board Extreme caution has to be taken i...

Page 8: ...solder joints can be done easily since the solder joints are clearly seen A visual inspection of the solder joints with conventional AOI automatic optical inspection system can be used Also X ray inspection can be used Cross sectional analysis is also an approved method to inspect how well solder has wetted the pads of component Cross sectional analysis is not used for production inspection but if...

Page 9: ... package plastic body with the soldering iron soldering iron should touch only the PCB pad and through that the heat should be conducted to the tin wire and component lead VTI has used 315ºC setting temperature for component soldering The temperature on the tip of the tool is 270 275ºC Soldering process takes only few seconds for each pin For leaded soldering we have used Multicore Sn60Pb40 and fo...

Page 10: ...ng 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 lo...

Page 11: ...l Aspects VTI Technologies respects environmental values and thus its DIL packages are lead free and RoHS compatible VTI Technologies sensors should be soldered with lead free solders in order to guarantee full RoHS compatibility 9 References JEDEC Electronic Industries Alliance Inc Moisture ReflowSensitivity Classification for Non Hermetic Solid State Surface Mount Devices J STD 020C Handling Pac...

Page 12: ... and SCA10x0 series TN71 VTI Technologies Oy 12 12 www vti fi Rev 1 0 10 Document Change Control Version Date Change Description 1 0 22 04 2008 Release VTI Technologies reserves all rights to modify this document without prior notice ...

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