View stbs06h stbs5d0 series datasheet:

SURFACE MOUNT STBS06H - STBS5D0 BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSOR VBR : 6.8 - 200 Volts PPK : 500 Watts SMA (DO-214AC) FEATURES : 1.1 ± 0.3 * 500W surge capability at 1ms * Excellent clamping capability * Low zener impedance 0.2 ± 0.07 * Fast response time : typically less 1.2 ± 0.2 2.1 ± 0.2 then 1.0 ps from 0 volt to VBR(min.) 2.6 ± 0.15 * Typical IR less then 1µA above 10V 2.0 ± 0.2 MECHANICAL DATA * Case : SMA Molded plastic Dimensions in millimeter * Epoxy : UL94V-O rate flame retardant * Lead : Lead Formed for Surface Mount * Mounting position : Any * Weight : 0.064 grams DEVICES FOR UNIPOLAR APPLICATIONS For Uni-directional altered the third letter of type from "B" to be "U". Electrical characteristics apply in both directions MAXIMUM