Abstract: Pulsed laser single event effects (PLSEE) facility was used to study single event latchup sensitivities of Samsung SRAM K6R4016V1D. The SEL threshold energy, cross section and current of the SRAM were obtained from the test. Current-limiting resistance and power cycling, which are commonly used in the engineering application, were also studied for the SRAM. The results show that SEL threshold energy is very low and SEL saturation cross section is very high for the SRAM. The SRAM is extremely susceptible to the radiation in the space.