[shkal]

Точнее, с минимальным сопротивлением в открытом состоянии.

"The range of VDS over which the FET behaves like a
good resistor depends on the particular FET and is roughly
proportional to the amount by which the gate voltage exceeds
threshold. Typically you might see nonlinearities of
about 2% for VDS<0.1(VGS −Vth), and perhaps 10% nonlinearity
for VDS≈0.25(VGS −Vth)."

4391 и J111 пойдут, 5103 нет.