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what I used to replace the same is MUR 160 ... the 4148 was not fast enough
But the datasheet for the MUR160 gives Trr of 60 ns, while the 1N4148 gives Trr of 4 ns. How could the 1N4148 be too slow?
Also the capacitance of the MUR160 is 20 pF compared to the 1N4148's 4 pF, so the MUR160 would throw the capacitance of the whole sub-circuit off.
Finally, when I look at alleged pictures of MUR160s they seem to have really fat leads, which makes sense given their higher current rating, but that will only make it more difficult to place them in the existing holes, especially since I'm having to do the rework without access to the backside of the PCB.
