Photosensitive semiconductor diode device with passive matching circuit

In a photosensitive semiconductor diode device (1), in particular, a PIN diode device (2) for converting optical signals into electronic signals, the semiconductor diode is provided with a lead for contacting the doped regions and for electroconductively connecting them to a following circuit (11), e.g., an electronic amplifier. To realize a matching between the semiconductor diode and the following circuit that is effective over a wide bandwidth by means of a passive matching circuit (10), the lead contains the matching circuit such that lead (4, 5) is constructed on at least part of its length (L) as a coplanar line or a microstrip line such that conductor width (S) and/or conductor spacing width (gap width W) varies along its length area (L) of the lead, with the characteristic impedance of this lead varying along the corresponding part of the line. A very high operating frequency and a low signal attenuation are thereby achieved, among other things.