We investigated two phase heat transfer in staggered and inline micro pin fin arrays, using deionized water and HFE-7200 as working fluids with exit qualities up to 90%. The inline and staggered arrays were wire EDM fabricated to have equivalent pin fin width of 153μm and height of 305μm on a heated base area of 0.96cm width by 2.88cm length. Mass fluxes ranged from 200 to 600kg/m2s for HFE-7200 and 400 to 1300kg/m2s for water. Base heat fluxes ranged from 27 to 118W/cm2 for water, and 1 to 36W/cm2 for HFE-7200. Average heat transfer coefficient and pressure drop data were obtained and successfully correlated to 3% MAE for water heat transfer coefficient, 10–13% MAE for HFE-7200 heat transfer coefficient, and 15–30% MAE for pressure drop in these pin fin arrays.