Recommended Reflow for Cypress Parts Information

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.