STH-20 by Keystone Electronics Corp Design and production,in Fidelis Electronics Limited Spot sales,And can pass Fidelis Electronics Limited Purchasing。STH-20 Price reference $ 852.390000。STH-20 - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information STH-20 Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial