This specification covers the detail requirements for a silicon semiconductor diode (with removable adapter), types:1N21WE (forward polarity); 1N21WEM (matched forward pair); 1N21WEMR (matched forward and reverse pair); for use as a mixer in S-band equipment. Ratings for the 1N21WE are applicable to the types having additional suffixes (see 3.5.1). This drawing may be used as a substitute for parts listed on MIL-S-19500/232 which has been cancelled (see 6.3).