UT1553B BCRTMP bus controller remote terminal multi-protocol: SMD. Class designator QML Q. Lead finish gold. Total dose none. UT1553B BCRTMP bus controller remote terminal multi-protocol: SMD. Class designator QML Q. Lead finish optional. Total dose none. UT1553B BCRTMP bus controller remote terminal multi-protocol: SMD. Class designator QML Q. Lead finish solder. Total dose none. UT1553B BCRTMP bus controller remote terminal multi-protocol. Lead finish gold. Prototype flow.