5 x 4.4 x 1mm, Length: 6.5mm.STMicroelectronics ST75185CTR Line Transceiver, 20-Pin TSSOP, Number of Transmitters: 3, Mounting Type: Surface Mount, Data Rate: 120kbps, Interface Standards: RS-232, Transmitter Signal Type: Single Ended, Minimum Operating Temperature: 0 °C, Maximum Operating Temperature: +70 °C, Dimensions: 6.