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SN74LS86A: Wave Solder Conditions for SN74LS86A

Part Number: SN74LS86A

Hi team

Good day!

I referred the Application Report " Wave Solder Exposure of SMT Packages" for Wave Solder Conditions for SN74LS86A.
And I have question about preheat temperature in this Application Report.

Could you share the measurement point for preheat temperature?
Is it component terminals, or component surface?

Best regards