Quectel AF55C Hardware Design page 51

Table 30: Recommended Thermal Profile Parameters
Factor
Soak Zone
Ramp-to-soak slope
Soak time (between A and B: 150 ° C and 200 ° C)
Reflow Zone
Ramp-up slope
Reflow time (D: over 217 ° C)
Max temperature
Cool-down slope
Reflow Cycle
Max reflow cycle
NOTE
1. The above profile parameter requirements are for the measured temperature of the solder joints. Both
the hottest and coldest spots of solder joints on the PCB should meet the above requirements.
2. During manufacturing and soldering, or any other processes that may contact the module directly,
NEVER wipe the module's shielding can with organic solvents, such as acetone, ethyl alcohol,
isopropyl alcohol, trichloroethylene, etc. Otherwise, the shielding can may become rusted.
3. The shielding can for the module is made of Cupro-Nickel base material. It is tested that after 12
hours' Neutral Salt Spray test, the laser engraved label information on the shielding can is still clearly
identifiable and the QR code is still readable, although white rust may be found.
4. If a conformal coating is necessary for the module, do NOT use any coating material that may
chemically react with the PCB or shielding cover, and prevent the coating material from flowing into
the module.
5. Avoid using ultrasonic technology for module cleaning since it can damage crystals inside the module.
6. Due to the complexity of the SMT process, please contact Quectel Technical Support in advance for
any situation that you are not sure about, or any process (e.g. selective soldering, ultrasonic
soldering) that is not mentioned in document [3].
AF55C_Hardware_Design
Automotive Wi-Fi&Bluetooth Module Series
Recommended Value
0–3 ° C/s
70–120 s
0–3 ° C/s
40–70 s
235–246 ° C
-3–0 ° C/s
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