Paul Harden on Diodes

NA5N DATA SHEET: SMALL SIGNAL AND RECTIFIER DIODES

Some common preferred devices typical to QRP rigs and as
available from DigiKey, Mouser Electronics, etc.

---------------------------------------------------------------------
            ***** SMALL SIGNAL DIODES *****              (Pd=50mW)
DIODE     Bv   Vr  Ir   Vf @ If   Ir @ Vr  Trr  CdM   Cd(pF) @ Vr=
TYPE      (V) (V) (nA) (V)  (mA) (mA)  (V) (nS) (pF) .1v   1v  10v
---------------------------------------------------------------------
1N914   GE  75  75  25  1.0    10    25  20 4000   4  2.3  1.8  1.3
1N914A  GE  75  75  25  1.0    20    25  20 4000   4  2.3  1.8  1.3
1N914B  GE  75  75  25  1.0   100    25  20 4000   4  2.3  1.8  1.3
1N4148  GE  75  75  25  1.0    10    25  20    4   4  2.3  1.8  1.3
1N4448  GE 100  75  25  1.0   100    25  20    4   4  2.3  1.8  1.3
1N4150  GE  50  50  50   .7    10   100  50    4  2.5pF Max.
---------------------------------------------------------------------
1N4148 is low storage-time version of 1N914


-----------------------------------------------------------
         ***** RECTIFIER DIODES (Low Power) *****
DIODE     Bv   If   Ifs   Vr(rms) Ir   Vf  Trr*  Cd at Vr=
TYPE     (V)  (A)   (A)     (V)  (uA)  (V) (uS)  0.1v  10v
-----------------------------------------------------------
1N4001     50  1.0A   30A   35v    30  0.8v  3.5   50pF 20pF
1N4002    100  1.0    30A   70     30  0.8v  3.5   50   20 
1N4003    200  1.0    30   140     30  0.8v  3.5   50   20 
1N4004    400  1.0    30   280     30  0.8v  3.5   50   20
1N5400     50  3.0A  200A   50v   500  1.2v  3.5   50   20 
1N5401    100  3.0   200A  100    500  1.2v  3.5   50   20 
1N5402    200  3.0   200   200    500  1.2v  3.5   50   20 
1N5404    400  3.0   200   400    500  1.2v  3.5   50pF 20pF
Schottky Rectifiers (very low Vf)
1N5817     20  1.0A   25    14   1000  0.3v       190pF 90pF
1N5818     30  1.0    25    21   1000  0.3v       160   65
1N5819     40  1.0    25    28   1000  0.3v       115   50
-----------------------------------------------------------


Bv= Breakdown v.  If=Avg. forward current  Ifs=Max. surge current
Ir= Max. DC reverse current  Vr(rms)=RMS reverse volt.
Vf= Avg. forward voltage drop    Cd=junction capacitance @ given Vr
CdM=Maximum junction capacitance
Trr= Reverse recovery time at If=10mA to 1mA
Trr*=Reverse recovery time at Ir/If=1 (for rectifying AC)

REFERENCES:
1. GE Semiconductor Data Book
2. Motorola Rectifier Device Data Book (DL151/D) 1992
3. Motorola TVS/Zener Device Data Book (DL150)   1992