67Dart273 said Might be this https://datasheetspdf.com/pdf-file/594110/MCC/2SC1623-L6/1 That center terminal is the collector Info on the larger chip, HT1621B https://datasheet.lcsc.com/lcsc/2108251130_HTCSEMI-HT1621BRQZ_C2886391.pdf I am unable to read the smaller chip Click to expand...