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The mounting torque is in the range of 39 t0 59 N-cm. The distance between screw holes of the radiator fin must coincide with the distance between screw holes of the IC. The screw to be used must have a head equivalent to the one of truss machine screw or binder machine screw defined by JIS Washers must be also used to protect the IC case. No foreign matter such as cutting particles shall exist between heat sink and radiator fin. When applying grease on the junction surface, it must be applied uniformly on the whole surface. Because the heatsink mounting tab and the heatsink are at the same electric potential as the chip's GND, care must be taken when mounting the heatsink on more than one device. IC lead pins are soldered to the printed circuit board after the radiator fin is mounted on the IC.