This paper presents a piezoelectric dome-shaped-diaphragm transducer (DSDT) designed to harvest vibration energy for microgenerator applications. An equivalent circuit of the DSDT microgenerator is constructed and is used to investigate its efficiency in converting input mechanical vibration energy into output electrical power. The results show that DSDT-based microgenerators have a constant energy conversion efficiency of approximately 50%. The respective effects on the generated power output of the piezoelectric layer material (i.e. ZnO, PVDF or PZT), the piezoelectric layer thickness, the insulating layer thickness, the mass loading layer thickness, and the dome curvature radius are systematically examined. The results enable the optimal DSDT design parameter values to be specified for a given output power and piezoelectric material.