BC171: https://alltransistors.com/pdfdatasheet_microelectronics/bc171_bc172_bc173.pdf
BC107: http://www.farnell.com/datasheets/296633.pdf
BC237: https://www.onsemi.com/pdf/datasheet/bc237-d.pdf
BC337: https://www.onsemi.com/pdf/datasheet/bc337-d.pdf
BC414: https://alltransistors.com/adv/pdfdatasheet_cdil/bc413_bc414_b_c.pdf
BC547: https://www.sparkfun.com/datasheets/Components/BC546.pdf
2N930: https://www.digchip.com/datasheets/download_datasheet.php?id=46216&part-number=2N930
2N2270: https://alltransistors.com/adv/pdfdatasheet_cdil/2n2270.pdf
BCX58/BCX59: http://pdf.datasheetcatalog.com/datasheet/infineon/1-bcx58.pdf
BCX70: https://ro.mouser.com/datasheet/2/196/Infineon-BCW60_BCX70-DS-v01_01-en-461875.pdf
BC847: https://www.infineon.com/dgdl/Infineon-BC847SERIES_BC848SERIES_BC849SERIES_BC850SERIES-DS-v01_01-en.pdf?fileId=db3a304314dca389011541d4630a1657
BC108: https://datasheetspdf.com/pdf-file/662653/CDIL/BC108A/1