Bourns Soldering Profile for Lead-Free Chip Resistors, Arrays, and Networks 275 260°C peak <1> Maximum of 20 seconds between +255°C and +260°C <1> 255°C 225 220°C Temperature (°C) 190°C Ramp Down 6°C/second 60 - 90 seconds 175 150°C 125 120 - 150 seconds 10 seconds minimum 75 Ramp Up 3°C/second maximum 25 0 50 100 150 Time (seconds) 200 250 300