The SI1902DL-T1-E3 is a thin-film, through-hole, single-pole, double-throw (SPDT) switch manufactured by Vishay. It is designed to be part of a radio-frequency (RF) system and has a maximum operating frequency of 5GHz. The switch is rated at 5V and can handle up to 500mA. It has an isolation voltage of 50V and a typical insertion loss of 0.4dB max. It has an operating temperature range of -30°C to 105°C and is housed in a SMD package.