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SMAJ40A Arkusz danych(PDF) 7 Page - Littelfuse

Numer części SMAJ40A
Szczegółowy opis  TVS Diode Products
Download  146 Pages
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Producent  LITTELFUSE [Littelfuse]
Strona internetowa  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

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©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Transient Voltage Suppression Diodes
Electrostatic Discharge (ESD)
Electrostatic discharge is characterized by very fast
rise times and very high peak voltages and currents.
This energy is the result of an imbalance of positive and
negative charges between objects.
ESD that is generated by everyday activities can far surpass
the vulnerability threshold of standard semiconductor
technologies. Following are a few examples:
Walking across a carpet:
35kV @ RH = 20%;1.5kV @ RH = 65%
Walking across a vinyl floor:
12kV @ RH = 20%;250V @ RH = 65%
Worker at a bench:
6kV @ RH = 20%;100V @ RH = 65%
Vinyl envelopes:
7kV @ RH = 20%;600V @ RH = 65%
Poly bag picked up from desk:
20kV @ RH = 20%;1.2kV @ RH = 65%
Lightning Induced Transients
Even though a direct strike is clearly destructive, transients
induced by lightning are not the result of a direct strike.
When a lightning strike occurs, the event creates a
magnetic field which can induce transients of large
magnitude in nearby
electrical cables.
A cloud-to-cloud strike
will effect not only
overhead cables, but
also buried cables.
Even a strike 1 mile
distant (1.6km) can
generate 70 volts in
electrical cables.
In a cloud-to-ground
strike (as shown at
right) the transient-
generating effect is far
greater.
This diagram shows
a typical current
waveform for induced
lightning disturbances.
Inductive Load Switching
The switching of inductive loads generates high energy
transients which increase in magnitude with increasingly
heavy loads. When the inductive load is switched off, the
collapsing magnetic field is converted into electrical energy
which takes the form of a double exponential transient.
Depending on the source, these transients can be as large
as hundreds of volts and hundreds of Amps, with duration
times of 400 milliseconds.
Typical sources of inductive transients include:
Generator
Motor
Relay
Transformer
These examples are common in electrical and electronic
systems. Because the sizes of the loads vary according
to the application, the wave shape, duration, peak current
and peak voltage are all variables which exist in real world
transients. Once these variables can be approximated, a
suitable suppressor technology can be selected.
The diagram at right
shows a transient
which is the result of
stored energy within
the alternator of an
automobile charging
system.
A similar transient
can also be caused
by other DC motors
in a vehicle. For
example, DC motors power amenities such as power locks,
seats and windows. These various applications of a DC
motor can produce transients that are just as harmful to
the sensitive electronic components as transients created
in the external environment.
T
T1
VB
VS = 25V to 125V
VB=14V
T= 40ms to 400ms
VS
90%
10%
t
V
T1 = 5ms to 10ms
R = 0.5
to 4
100
90
50
10
O1
t
t1
t2
TIME
Transient Voltage Scenarios


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