F-452 View Datasheet(PDF) - SEMITEC Corporation
Part Name
Description
Manufacturer
F-452 Datasheet PDF : 44 Pages
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TRANSIENT VOLTAGE SUPPRESSOR
VRD
VRD is a transient voltage
suppressor used for protecting electric
circuits from surge voltage and thus
preventing breakdown.
VRD has superior surge suppression
characteristics, such as extremely fast
response time, very low clamping voltage,
and high surge capacity. Unlike metal oxide
varistors, VRD does not have characteristics
to change with surge variations within the
rated capacity. This feature comprises
another superior characteristics of the VRD
as a transient voltage suppressors.
Electrical characteristics
Figure 1 shows the electrical characteristics. Bipolar
type has almost symmetrical breakdown Voltage (VB)
The reverse breakdown voltage of the ZD type is 200
Volts or more at 10A DC.
VC
VB
VS
IT’
IL
IT
IP
Fig 1
VS:Stand-off voltage
VB:Break down voltage
VC:Maximum clamping voltage
IL :Maximum leakage current
VB’
IT :Test current
IP :Peak pulse current
Taping
One of standard taping is as shown in Figure.
Paper
5 or 7
2 max.
1 max.
L1ϪL2
ϭ1.5 max.
6
L1
52
Fig 2
1 max.
L2
6
L:26 or 52
Unit:(mm)
Surge capability
Allowable surge capability (Pm) is determined by the
following equation:
PmϭIpϫVC
Ip:Peak current
Vc:Maximum clamping voltage
The allowable surge capability (peak pulse power) of
VRD is shown in following Figure 3 and the surge ca-
pability derating characteristics are shown in Figure 6.
105
104
103
102
Z6 type
Z2 type
10
ZS1 type
ZD, Z1 type
10Ϫ4
Fig 3
10Ϫ3
10Ϫ2
10Ϫ1
1
10
102
Time (ms)
Surge waveform
There are many types of surge waveform depending
on the source of the surge. For the VRD surge
suppression characteristics test, the EXP waveform
shown below is used. The EXP waveform is shown as
ta / tb depending on the time width, however 10/1000
waveform is used as the standard test waveform.
IP
Surge suppression characteristics
When EXP waveform is applied to the circuit
below, the surge suppression waveform shown in the
figure 5 can be observed.
IP Peak current
Test pulse waveform
Maximum clamping voltage
VC
clamping voltage waveform
Time
Fig 5
Power derating
100
Z1 type
80
Z2 type
60
Z6 type
40
20
ZS1 type
20
40
60
80 100 120 140 160
Fig 6
Ambient temperature (ЊC)
IP/2
ta
tb
Fig 4
Time
26
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