Semiconductor arrangement with a solder resist layer

A semiconductor arrangement comprising:

• a lead frame with at least two separate pieces, each with a top and a bottom opposite the top, wherein the lead frame is made from a sheet metal semi-finished product and the at least two pieces are not connected by a continuous lead frame material;
• at least one solder resist layer which partially covers the tops and the bottoms and that is of U-shaped cross section at least in selected locations, such that the solder resist layer extends beyond end faces of the lead frame and reaches as a continuous layer from the top to the bottom, wherein the selected locations of the U-shaped cross section of the solder resist layer are locations where the end faces of the two separate pieces of the lead frame are adjacent to one another, and wherein at least portions of sub-zones of the tops and the bottoms, which are not covered by the solder resist layer, form electrical base members;
• an optoelectronic semiconductor element, which is mounted on at least one of the base members on the top and is connected electrically conductively therewith, and
• a radiation-transmissive encapsulant applied at least to the tops of the pieces, the encapsulant covering up the semiconductor element and lying at least partially against the solder resist layer,
• wherein the base members are bordered all round by the solder resist layer when viewed from a top view of the top or the bottom, the semiconductor element is mounted on exactly one of the pieces of the lead frame and connected electrically conductively via an electrically conductive connecting element to at least one other of the pieces and the pieces are connected mechanically by the encapsulant.