UNE-EN 60539-1:2016 Directly heated negative temperature coefficient thermistors - Part 1: Generic specification (Endorsed by AENOR in September of 2016.)
2017UNE-EN 60539-1:2016/AC:2017-09 Directly heated negative temperature coefficient thermistors - Part 1: Generic specification (Endorsed by Asociación Española de Normalización in November of 2017.)
2016UNE-EN 60539-1:2016 Directly heated negative temperature coefficient thermistors - Part 1: Generic specification (Endorsed by AENOR in September of 2016.)