The TMMDB3 is an electronic part manufactured by STMicroelectronics that contains a diac and MiniMELF package. The diac is a type of semiconductor pack that provides two power terminals and two controlled electrodes. It has a maximum current rating of 2A and it supports a voltage supply range of 28 to 36V. This electronic part can be used in various applications like controlling snubbers, triggering or commutating SCR/TRIAC, thermal cutouts and motor control.