Which on of these can be a better sub to replace MMBT5087
https://www.fairchildsemi.com/datasheets/MM/MMBT5087.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBT5401.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBTA56.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBTA92.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBT4403.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBT5087.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBT5401.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBTA56.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBTA92.pdf
https://www.fairchildsemi.com/datasheets/MM/MMBT4403.pdf
i would go for BC857 http://cache.nxp.com/documents/data_sheet/BC856_BC857_BC858.pdf?pspll=1
In the class D section
base connects to pin 5 of driver IC
emitter connects to pin 3 of driver IC
collector connect to source leg of output FET
http://www.infineon.com/dgdl/irs20124s.pdf?fileId=5546d462533600a401535675ca352786
http://www.infineon.com/dgdl/irfb4115pbf.pdf?fileId=5546d462533600a401535615ba6a1e0f
base connects to pin 5 of driver IC
emitter connects to pin 3 of driver IC
collector connect to source leg of output FET
http://www.infineon.com/dgdl/irs20124s.pdf?fileId=5546d462533600a401535675ca352786
http://www.infineon.com/dgdl/irfb4115pbf.pdf?fileId=5546d462533600a401535615ba6a1e0f
All of the ones you listed are better in current and voltage ratings. The DC current gain is where they're lacking. They should easily survive but they may not allow the protection circuit to function properly.
Maybe someone with a better understanding of the IC could offer a more definitive answer.
Maybe someone with a better understanding of the IC could offer a more definitive answer.
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