RD4.7M Zener Diodes 200mW/0.2W SOT23-4.7V marking B1 471 constant voltage/constant current/surge absorber|Welcome to Eric Online Store - Shenzhen ERIC Electronics Co., Ltd.
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KDZTR7.5B Zener Diodes 7.889V 1W PMDU/SOD123/1206-7.5V marking QB voltage regulation/high ESD tolerance|Welcome to Eric Online Store - Shenzhen ERIC Electronics Co., Ltd.
identification - TVS diode replacement - top marking P450 DEM - Electrical Engineering Stack Exchange