  In this work we will document the design and the performances of a SiPM-based
photodetector with a surface area of 100 cm$^2$ conceived to operate as a
replacement for PMTs. The signals from 94 SiPMs are summed up to produce an
aggregated output that exhibits in liquid nitrogen a dark count rate (DCR)
lower than 100 cps over the entire surface, a signal to noise ratio better than
13, and a timing resolution better than 5.5 ns. The module feeds about 360 mW
at 5 V with a dynamic range in excess of 500 photo-electrons on a 100 $\Omega$
differential line. The unit is compatible with operations at room temperature,
with a DCR increased by about 6 orders of magnitude.
