Recommended Reflow for Cypress Parts Information
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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 |
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Preheat/Soak |
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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 |
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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:
- Peak Temperature tolerance is +5/-0 °C of Classification Temp (Tc).
- All temperatures refer to topside of the package, measured on the package body surface.
- 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.
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