SCA3000 VTI [VTI technologies], SCA3000 Datasheet
SCA3000
Available stocks
Related parts for SCA3000
SCA3000 Summary of contents
Page 1
... SCA3000 Assembly Instructions SCA3000 Series 3-axis accelerometer ...
Page 2
... TABLE OF CONTENTS 1 Objective ............................................................................................................................... 3 2 VTI's Molded Interconnection Device Package (MID)........................................................ 3 3 SCA3000 Package Outline and Dimensions ...................................................................... 5 4 Tape and reel specifications ............................................................................................... 6 5 Printed Wiring Board (PWB) Level Guidelines .................................................................. 8 5.1 Land Pad Design....................................................................................................................... 8 5.2 Solder Paste .............................................................................................................................. 8 5.3 Stencil ........................................................................................................................................ 9 5.4 Paste Printing............................................................................................................................ 9 5.5 Component Picking .................................................................................................................. 9 5.6 Component Placement ............................................................................................................. 9 5.7 Reflow Soldering....................................................................................................................... 9 5 ...
Page 3
... The housing of the SCA3000 component is relatively new packaging concept, which is called a molded interconnection device (MID), which is a modified Dual Flat-pack No-lead package (DFN). The MID housing is leadless component as well as DFN package. The SCA3000 component is a surface mount plastic package with leads located at the bottom of the package, see picture 1. ...
Page 4
... Because the MID platform represents the latest in surface mount packaging technology important that the design of the printed wiring board, as well as the assembly process, follows the suggested guidelines outlined in this document. VTI Technologies Oy www.vti.fi Subject to changes TN54 SCA3000 Assembly Instructions 4/15 Rev.C ...
Page 5
... SCA3000 Package Outline and Dimensions The outline and dimensions for the SCA3000 MID package are presented in figure 4. 7.00 7.00 0.55 (18x) 0.55 (18x) 0.43 (18x) 0.43 (18x) 0.80 0.80 0.80 0.80 = 6. Figure 4. Outline and dimensions of the SCA3000 component. VTI Technologies Oy www.vti.fi 0.10 0.10 1.80 1.80 Subject to changes TN54 SCA3000 Assembly Instructions 5/15 Rev.C ...
Page 6
... Tape and reel specifications Packing tape dimensions, unreeling direction and SCA3000 component orientation are presented in figure 5, table 1 and table 2 below (dimensions are in millimeters [mm]). Direction of unreeling Figure 5. SCA3000 packing tape and component orientation on tape. Table 1. SCA3000 packing tape pocket dimensions [mm 7.2 ±0.1 7.4 ± ...
Page 7
... The reel dimensions are presented in figure 6 and table 3 below (dimensions are in millimeters [mm]). Figure 6. Reel dimensions. Table 3. SCA3000 Packing reel dimensions [mm 330 100 ±1 Both tape and reel are ESD materials and they are suitable for baking for 24 hours at +125°C. ...
Page 8
... In order to guarantee full RoHS compatibility lead-free solder should be used for the soldering of VTI's SCA3000 component. Also traditional eutectic SnPb solder can be used for soldering the SCA3000 packages if a lead- free process is not required. With the eutectic SnPb solder, the melting point is 183°C. ...
Page 9
... The reflow profile used for soldering the SCA3000 package should always follow the solder paste manufacturer's specifications and recommended profile. The typical ramp-up rate is 3°C/second max. The reflow max. peak temperature (measured from the component body) should not exceed 260° ...
Page 10
... As a general guide, one thermo-couple should be placed under a component having the largest thermal mass, one next to the smallest component, one should be in contact with SCA3000 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 ...
Page 11
... 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 required, it can be used to establish and optimize the component assembly process parameters. Cross- sectioning is a destructive inspection method. An example of a SCA3000 solder joint cross-section in presented in figure 10. Outer ...
Page 12
... The use of X-ray inspection techniques can be used to verify the success of the rework process. It should be noted, that the performance and the reliability of the reworked component may have decreased due to the rework operation. VTI Technologies Oy www.vti.fi Subject to changes TN54 SCA3000 Assembly Instructions 12/15 Rev.C ...
Page 13
... Hand Soldering Guidelines Hand soldering of the SCA3000 MID package is not recommended. For proto-uses of the SCA3000 component, VTI can provide pre-assembled component on a PWB. For hand soldering of the SCA3000 component, VTI recommends eutectic tin-lead solder paste due to the lower melting point compared to lead-free solder pastes. ...
Page 14
... VTI Technologies respects environmental values and thus its MID packaged pressure sensors are lead-free and RoHS compatible. VTI Technologies’ sensors should be soldered with lead-free solders in order to guarantee full RoHS compatibility. VTI Technologies Oy www.vti.fi Subject to changes TN54 SCA3000 Assembly Instructions 2x amount of solder paste compared to smaller PWB soldering pads 14/15 Rev.C ...
Page 15
... Date Rev. A 30.06.2006 Rev. B 27.09.2006 Rev. C 13.02.2007 VTI Technologies reserves all rights to modify this document without prior notice. VTI Technologies Oy www.vti.fi Change Description First release Rework guidelines added. Corrections to reel dimensions Corrections to reflow soldering Subject to changes TN54 SCA3000 Assembly Instructions 15/15 Rev.C ...