U1D boost parts for Antminer hash board The U1D transistor is a high efficiency, integrated NMOSFET current mode and fixed frequency boost converter. An extremely low Rds-on NMOSFET and feedback voltage are integrated to reduce power loss and achieve high efficiency. Packaged in SOT23-6, it is an equivalent replacement chip for the SY7302ABC. Repair for Bitcoin miners hash board such as Antminer T17e, S19, S19+.