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7/14/2025, 10:55:00 PM
heres another fuck up
>use SOT-23 BJTs for everything
>essentially every SOT-23 BJT is BEC
>select the Q_NPN_BEC (or Q_PNP_BEC) symbol in KiCAD and set the footprint to SOT-23-3
>everything works completely fine because why wouldnt it
>fast forward a couple months
>eventually need something with a little more oomf
>SOT-89 looks like a popular footprint thats still fairly small and cheap
>set footprint to SOT-89-3
>look at datasheet
>wait a minute
>these are ECB, not BEC
>use the Q_xxx_ECB symbol instead
>phew, that was a close one
>board shows up
>SOT-89 BJTs arent working
>look at datasheet
>everything seems fine, keep troubleshooting
>cant find issue
>look at datasheet again
>i definitely set the symbol to ECB, and the datasheet clearly says these are ECB, so why the fuck arent these working
>keep troubleshooting
>im at my wits end
>look at datasheet
>it suddenly hits me
how the fuck was i supposed to know to check for that :(
>use SOT-23 BJTs for everything
>essentially every SOT-23 BJT is BEC
>select the Q_NPN_BEC (or Q_PNP_BEC) symbol in KiCAD and set the footprint to SOT-23-3
>everything works completely fine because why wouldnt it
>fast forward a couple months
>eventually need something with a little more oomf
>SOT-89 looks like a popular footprint thats still fairly small and cheap
>set footprint to SOT-89-3
>look at datasheet
>wait a minute
>these are ECB, not BEC
>use the Q_xxx_ECB symbol instead
>phew, that was a close one
>board shows up
>SOT-89 BJTs arent working
>look at datasheet
>everything seems fine, keep troubleshooting
>cant find issue
>look at datasheet again
>i definitely set the symbol to ECB, and the datasheet clearly says these are ECB, so why the fuck arent these working
>keep troubleshooting
>im at my wits end
>look at datasheet
>it suddenly hits me
how the fuck was i supposed to know to check for that :(
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