Oceangoing long-range mine-laying/supply U-boat type of conventional design developed in 1937
| Surface/submerged displacement: | 1763/2132 t |
| Overall length/beam/draught: | 89.80 m/9.20 m/4.71 m |
| Standard main armament: | 30 vertical mine tubes with 66 mines (SMA type), 2 stern torpedo tubes with up to 7 torpedoes, 1942–1944 in addition up to 8 reserve torpedoes in watertight containers alongside deck |