IEC 60539-1:2022

Directly heated negative temperature coefficient thermistors - Part 1: Generic specification

IEC 60539-2:2019

Directly heated negative temperature coefficient thermistors - Part 2: Sectional specification - Surface mount negative temperature coefficient thermistors

IEC 60539-2:2019 RLV

Directly heated negative temperature coefficient thermistors - Part 2: Sectional specification - Surface mount negative temperature coefficient thermistors