cathode

(1) The n‑type region to which the forward current flows within a semiconductor diode.

NOTE    In Schottky diodes, usually the barrier metal replaces the p‑type semiconductor region and the remaining semiconductor region is n‑type; however, some Schottky diodes have been made with the barrier metal replacing the n‑type semiconductor region, in which case the remaining semiconductor region is p‑type.

(2) A circuit element to which negative bias is applied.

NOTE    For the purpose of JEP154, when the die is the cathode, the electron flow is from the die through the solder bump to the substrate.

References: 

JESD77-B, 2/00
JESD282-B, 4/00
JEP154, 1/08