Multianode microchannel arrays (MAMAs) are a family of digital photoelectric detector systems designed specifically for use in space. Development of MAMA detector systems started in the early 1970s in order to produce multielement detector arrays for use in spectrographs for solar studies on the Skylab-B mission. Two different classes of MAMA detectors have been developed, namely discrete-anode arrays and coincidence-anode arrays. Discrete-anode arrays each have pixel electrodes connected to an individual amplifier and counting circuit. This limits the total number of pixels to a few hundred because of the limitations of connector technology and the size and power requirements of the electronics.1,2 In order to provide the to pixels required for astrophysics missions, coincidence-anode arrays were developed.3 The Space Telescope Imaging Spectrograph (STIS) employs three imaging array detectors.4 First, a back side–illuminated () pixel charge-coupled device (CCD), fabricated by Scientific Imaging Technologies, covers the visible region from to the edge of the near-infrared at . The CCD has pixel dimensions of . Two coincidence-anode MAMAs, fabricated by the prime contractor Ball Aerospace, cover, respectively, the near-ultraviolet (NUV) and the far-ultraviolet (FUV). Each MAMA employs a single high-gain curved-channel microchannel plate (MCP) with 12-micron-diameter channels on 15-micron centers. Two readout modes are employed, as described in Sec. 2: first, low-resolution mode with having dimensions of , and second, high-resolution mode with having dimensions of .