MCP3426A7T-E/MC MCP3426A7T-E/MS MCP3426A7T-E/SN MCP3426AOT-E/MS MCP3427-E/MF MCP3427-E/UN MCP3427T-E/MF MCP3427T-E/UN MCP3428-E/SL MCP3428-E/SL 工控元件