Model Number STLM20 Grade 9(STLM20DD9F) This is an overview of the STLM20 Grade9(STLM20DD9F) and the OSS-ECAL offering for the STLM20 Grade9. STLM20 Grade9 is a temperatures sensor IC (-40 °C to +85 °C) made by STMicroelectronics. Model Number