Usually we recommend to work within an overvoltage range of 2.5 V to 5.0 V. Nevertheless our SiPMs can also be operated at higher overvoltages, depending on the type up to 10.0 V overvoltage. As long as there is a current limit set for the operation, the SiPM cannot be destroyed. Nevertheless please keep in mind that at higher overvoltages also the noise increases.