104KT1608T ETC1 [List of Unclassifed Manufacturers], 104KT1608T Datasheet - Page 26

• Manufacturer Part Number: 104KT1608T
• Description: THERMOPILE TYPE INFRARED SENSOR
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

VRD
26
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 (V
The reverse breakdown voltage of the ZD type is 200
Volts or more at 10 A DC.
TRANSIENT VOLTAGE SUPPRESSOR
Taping
One of standard taping is as shown in Figure.
Fig 1
Fig 2
1 max.
I
T
’
6
V
V
V
C
B
S
L
1
V
1.5 max.
B
I
L
’
L
2
L
1
Paper
I
T
V
V
V
I
I
I
52
L
T
P
S
B
C
:Stand-off voltage
:Break down voltage
:Maximum clamping voltage
:Maximum leakage current
:Test current
:Peak pulse current
L
1 max.
2
5 or 7
2 max.
6
L:26 or 52
Unit:(mm)
I
P
B
)
Surge capability
Allowable surge capability (Pm) is determined by the
following equation:
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.
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.
Fig 3
Fig 4
Pm Ip V
Ip:Peak current
Vc:Maximum clamping voltage
I
P/2
I
10
10
10
10
10
P
5
4
3
2
10
4
t
a
t
b
C
10
3
10
2
10
1
1
Time (ms)
10
10
Z2 type
ZS1 type
ZD, Z1 type
Time
Z6 type
2
Surge suppression characteristics
When EXP waveform is applied to the circuit
below, the surge suppression waveform shown in the
figure 5 can be observed.
Power derating
Fig 5
Fig 6
V
I
P
C
100
80
60
40
20
Peak current
20
Test pulse waveform
Maximum clamping voltage
40
Z6 type
60
Ambient temperature ( C)
80
clamping voltage waveform
Z1 type
Z2 type
100
120
Time
140
ZS1 type
160