View stbk06i stbk5g4 series datasheet:

Certificate TH97/10561QM Certificate TW00/17276EM SURFACE MOUNT STBK06I - STBK5G4 BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSOR VBR : 6.8 - 440 Volts PPK : 1500 Watts SMC (DO-214AB) 0.060(1.52) 0.030(0.76) FEATURES : * 1500W surge capability at 1ms 0.008(0.203) * Excellent clamping capability 0.004(0.102) * Low zener impedance * Fast response time : typically less 0.121(3.07) 0.012(0.305) then 1.0 ps from 0 volt to VBR(min.) 0.115(2.92) 0.006(0.152) * Typical IR less then 1µA above 10V 0.103(2.62) 0.245(6.22) 0.220(5.59) 0.079(2.00) * Pb / RoHS Free MECHANICAL DATA * Case : SMC Molded plastic Dimensions in inches and (millimeter) * Epoxy : UL94V-O rate flame retardant * Lead : Lead Formed for Surface Mount * Polarity : Color band denotes cathode end except B