IEC 60539-2:2003+A1:2010 is applicable to surface mount directly heated negative temperature coefficient thermistors, typically made from transition metal oxide materials with semiconducting properties. These thermistors have metallized connecting pads or soldering strips and are intended to be mounted directly on to substrates for hybrid circuits or on to printed boards.This consolidated version consists of the first edition (2003) and its amendment 1 (2010). Therefore, no need to order amendment inaddition to this publication.