Hi, the placement records are decent for EE in IIT Bombay. There are 5 specializations in IIT Bombay for EE so as you have mentioned microelectronics the companies which come for rectruitments are Intel, Cisco, Samsung, Infenion etc.
On an average, the placement packages you can get is  approx 8-12 lacs with 90-95% candidates getting placed.
Good Luck.