Approval sheet

Page 5 of 11

ASC_MMxxB&C

AUG - 2018

SOLDERING CONDITION

The robust construction of cylindrical resistors allows them to be completely immersed in a solder bath of 260

°C

for 10 seconds. Therefore, it is possible to mount Surface Mount Resistors on one side of a PCB and other

discrete components on the reverse (mixed PCBs).

Surface Mount Resistors are tested for solderability at 235

°C during 2 seconds within lead-free solder bath. The

test condition for no leaching is 260

°C for 30 seconds. Typical examples of soldering profile and condition that

provide reliable joints without any damage are given in Fig 3. and Table 1.

Fig. 3 Infrared soldering profile for MELF Resistors

Table 1. Infrared soldering condition for MELF Resistors

Temperature Condition

Exposure Time

Average ramp-up rate (217

°C to 260°C)

Less than 3

°C/second

Between 150 and 200

°C

Between 60-120 seconds

> 217

°C

Between 60-150 seconds

Peak Temperature

260ºC +0/-5

°C

Time within 245

°C

Min. 30 seconds

Ramp-down rate (Peak to 217

°C)

Less than 6

°C/second

Time from 25

°C to Peak

No greater than 480 seconds

For Ni/Sn series soldering