6-
9
Internal Leakage Flaw in a Diode
Figure 6-14. Defective Diode Model with an Internal Leakage Resistance
V
s
=10V, R
s
=100 Ω
ΩΩ
Ω V
s
=15V, R
s
=1 kΩ
ΩΩ
Ω V
s
=15V, R
s
=10 kΩ
ΩΩ
Ω
Figure 6-15. Signature of a Diode with Internal Leakage Flaw. 1N914 Diode with
a 10kΩ Resistor in Parallel
Notice that in the 10V,100Ω
ΩΩ
Ω range there does not seem to be any problem, but that in the other
two ranges, you can see the diode conducting when it should be acting like an open. This is
called leakage. The diode acts like a diode when it is forward biased. When reverse biased, the
diode acts like a resistor when it should be acting as an open.
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