This study presents the development and characterization of a Long-Wave Infrared (LWIR) detector based on InAs/InAsSb superlattice technology for use in cooled Focal Plane Arrays (FPAs). The InAs/InAsSb superlattice structure offers improved performance over traditional LWIR detectors due to its ability to suppress Auger recombination and reduce dark current. The detector was designed to operate in the 8-12 μm spectral range and optimized for low-temperature operation. Experimental results demonstrate high quantum efficiency, and low dark current. The performance metrics, including responsivity, detectivity, and noise equivalent temperature difference (NETD), are reported and compared to state-of-the-art HgCdTe detectors. This novel InAs/InAsSb superlattice detector shows promise for advanced thermal imaging applications, particularly in scenarios requiring high sensitivity and low power consumption.