IEC 60747-4:2007+A1:2017 Provides requirements for the following categories of discrete devices: variable capacitance diodes and snap-off diodes, mixer diodes and detector diodes, avalanche diodes, gunn diodes,bipolar transistors and field-effect transistors. This second edition cancels and replaces the first edition, published in 1991, its amendments 1, 2 and 3 (1993, 1999 and 2001, respectively), and constitutes a technical revision. THIS CONSOLIDATED VERSION CONSISTS OF THE SECOND EDITION (2007) AND ITS AMENDMENT 1 (2017). THEREFORE, NO NEED TO ORDER AMENDMENT IN ADDITION TO THIS PUBLICATION.