The Micro USB connector on Samsung devices starting with the Galaxy S3 uses 11 pins instead of the standard five pins. When using an MHL cable with a 5-pin Micro USB plug to send content to a large screen via HDMI or VGA, an 11-to-5 pin adapter is required (see MHL). See Samsung 30-pin connector.
Adapting Eleven Pins to Five
An 11-to-5 pin adapter is required to send signals via MHL over HDMI or VGA to a projector or TV. Samsung 11-pin Micro USB plugs and sockets are slightly longer than the standard 5-pin Micro USB.