Recommended Reflow for Cypress Parts Information

Version 1
    Question: What is Cypress’s Parts Recommended Reflow?

     

    Answer:

    Please see below Cypress Reflow Profile. Cypress’s Reflow Profile is compliant with Jedec J-STD-020D.1.

    Example on how to get the Peak package body temperature is shown below.

    Reflow Profiles (per Jedec J-STD-020D.1)

     

                                                                                                                                                                                                                                                                             
       

         Profile Feature

      
       

         Sn-Pb Eutectic Assembly

      
       

         Pb-Free Assembly

      
       

          

      
       

          

      
       

          

      
       

         Preheat/Soak

      
       

          

      
       

          

      
       

         Temperature Min (Tsmin)

      
       

         100 °C

      
       

         150 °C

      
       

         Temperature Max (Tsmax)

      
       

         150 °C

      
       

         200 °C

      
       

         Time (ts) from (Tsmin to Tsmax)

      
       

         60-120 seconds

      
       

         60-120 seconds

      
       

         Ramp-up rate (TL to Tp)

      
       

         3 °C/second max.

      
       

         3 °C/second max.

      
       

         Liquidous temperature (TL)

      
       

         183 °C

      
       

         217 °C

      
       

         Time (tL) maintained above TL

      
       

         60-150 seconds

      
       

         60-150 seconds

      
       

         Peak package body temperature (Tp)

      
       

         For users Tp must not exceed the Classification temp in Table 2A. For suppliers Tp must equal or exceed the Classification temp in Table 2A

      
       

         For users Tp must not exceed the Classification temp in Table 2B. For suppliers Tp must equal or exceed the Classification temp in Table 2B

      
       

         Time (tp)* within 5 °C of the specified classification temperature (Tc), see Table 2a & 2B

      
       

         20* seconds

      
       

         30* seconds

      
       

         Figure 5-1. J-STD-020D.1

      
       

          

      
       

          

      
       

         Ramp-down rate (Tp to TL)

      
       

         6 °C/second max.

      
       

         6 °C/second max.

      
       

         Time 25 °C to peak temperature

      
       

         6 minutes max.

      
       

         8 minutes max.

      
       

         * Tolerance for peak profile temperature (Tp) is defined as a supplier minimum and a user maximum

       

         .

      

    Table 2A
    SnPb Eutectic Process - Classification Temperatures (Tc)

     

                                                             
       

         Package Thickness

      
       

                   Volume  mm3

       

         <350

      
       

                        Volume mm3

       

         >=350

      
       

         <2.5 mm

      
       

         235 °C

      
       

         220 °C

      
       

         >=2.5 mm

      
       

         220 °C

      
       

         220 °C

      

     

    Table 2B
    Pb-Free Process -Classification Temperatures (Tc)

     

                                                                                               
       

         Package Thickness

      
       

              Volume mm3

       

         <350

      
       

                Volume mm3

       

         350 - 2000

      
       

               Volume mm3

       

                      >2000

      
       

         <1.6 mm

      
       

         260 °C

      
       

         260 °C

      
       

          260 °C

      
       

         1.6 mm - 2.5 mm

      
       

         260 °C

      
       

         250 °C

      
       

         245 °C

      
       

         >2.5 mm

      
       

         250 °C

      
       

         245 °C

      
       

         245 °C

      

    Note:

      1.   Peak Temperature tolerance is +5/-0 °C of Classification Temp (Tc).
      2.   All temperatures refer to topside of the package, measured on the package body surface.
      3.   Package volume excludes external terminals (e.g., balls, bumps, lands, leads) and/or nonintegral heat sinks.

       For example:
      To be able to get the reflow profile of a part, we need to know first the Package dimension or volume. 

      MPN: CY7C65620-56LTXC
      Package: QFN56, Pb-Free Part
      Package Dimension: 8x8x1.0mm
      Package Volume: 64mm3
      Package Thickness: 1.0mm

      You can get package dimension on the datasheet’s Package Diagram.


      Since the part is a Pb Free Part, Table 2B should be used. Based on this table, is the package volume is <350 mm3 and the package thickness is <1.6mm, Peak Temperature = 260 °C

      If the part number is SnPb Part, Table 2a is applicable.