... 3.make fast recovery russia standard recovery diode(stud version)Russia type, stud version rectifier diode, 350A~500A, 200V~1600V. D171,D161 ... case, also could make fast recovery type, and avalanche diode.Features High surge current capabilityStud cathode and stud anode versionWide current rangeMetric ... 0.12 -40~+125 30.0 RSD6 russia standard recovery diode(stud version)