Automotive AEC-Q200 Transformers HALO Electronics Automotive AEC-Q200 Transformers are ideal for use in both Ethernet and MOST50 communication applications. HALO Electronics Ethernet transformers are specifically designed for infotainment automotive applications and are available in either Grade 1 or Grade 3 temperature ratings. The MOST50® isolation transformers comply with the MOST Cooperation standards and are typically used in gateway and analog/digital video interface applications.