The MARS '96 spacecraft is devoted to a mission to planet Mars with a lifetime of three years. This paper presents the characteristics of the IR detection modules for the OMEGA IR spectrometer. SAT has developed the identification model, development model, and flight models of detectors, each having 2 arrays and IR filters in a dedicated space housing equipped with a flexible electrical line and a connector. An array is composed of 128 multiplexed InSb photovoltaic detectors surrounded by a specific IR filter. Each filter is divided into 2 zones. The multiplexed read-out is obtained with a Si CCD device. Space-designed and qualified for SPOT IV, it has not been modified for our 77 K operating condition, only the drive electronics, bias conditions, and phase clocking have been adapted to the 128 detectors. An evaluation program has been applied, according to ESA requirements, with environmental tests and the results are reported including mechanical tests. thermal cycling, ESD testing, and irradiation. Complete measurements have been performed with IR filters, specific packaging, and cold line integrated in the equipment.