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1N5358B Folha de dados(PDF) 5 Page - Transys Electronics

Nome de Peças 1N5358B
Descrição Electrónicos  GLASS PASSIVATED JUNCTION SILICON ZENER DIODE
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Fabricante Electrônico  TRSYS [Transys Electronics]
Página de início  http://www.transyselectronics.com
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1N5358B Folha de dados(HTML) 5 Page - Transys Electronics

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APPLICATION NOTE:
Since the actual voltage available from a given zener
diode is temperature dependent, it is necessary to
determine
junction
temperature
under
any
set
of
operating conditions in order to calculate its value. The
following procedure is recommended:
Lead Temperature, TL, should be determined from:
TL = LAPD + TA
LA is the lead-to-ambient thermal resistance (
/W)
and PD is the power dissipation.
Junction Temperature, TJ , may be found from:
TJ = TL + TJL
TJL is the increase in junction temperature above the
lead temperature and may be found from Figure 3 for a
train of power pulses or from Figure 4 for dc power.
TJL = JLPD
For worst-case design, using expected limits of Iz, limits
of PD and the extremes of TJ( TJ) may be estimated.
Changes in voltage, Vz, can then be found from:
V = VZ TJ
VZ, the zener voltage temperature coefficient, is fount
from Figures 2.
Under high power-pulse operation, the zener voltage will
vary with time and may also be affected significantly be
the zener resistance. For best regulation, keep current
excursions as low as possible.
Data of Figure 3 should not be used to compute surge
capability. Surge limitations are given in Figure 5. They
are lower than would be expected by considering only
junction temperature, as current crowding effects cause
temperatures to be extremely high in small spots
resulting in device degradation should the limits of
Figure. 5 be exceeded.


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