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V18ZA05 データシート(PDF) 5 Page - Harris Corporation

部品番号. V18ZA05
部品情報  Radial Lead Metal-Oxide Varistors for Low to Medium Voltage Operation
ダウンロード  12 Pages
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メーカー  HARRIS [Harris Corporation]
ホームページ  http://www.harris.com
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V18ZA05 Datasheet(HTML) 5 Page - Harris Corporation

 
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4-38
Power Dissipation Ratings
Should transients occur in rapid succession, the average
power dissipation required is simply the energy (watt-
seconds) per pulse times the number of pulses per second.
The power so developed must be within the specifications
shown on the Device Ratings and Specifications table for the
specific device. Furthermore, the operating values need to
be derated at high temperatures as shown in Figure 1.
Because varistors can only dissipate a relatively small
amount of average power they are, therefore, not suitable for
repetitive applications that involve substantial amounts of
average power dissipation.
1.
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140
150
AMBIENT TEMPERATURE (oC)
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05 - V68ZA05
FIGURE 4. CLAMPING VOLTAGE FOR V82ZA05 - V330ZA05
100
90
50
10
O1
T
T1
T2
TIME
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T1 = Virtual Front time = 1.25 • t
T2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20
µs Current Waveform:
8
µs = T1 = Virtual Front Time
20
µs = T2 = Virtual Time to Half Value
600
500
400
300
200
100
90
80
70
60
50
40
30
20
PEAK AMPERES (A)
10-2
10-1
100
101
102
103
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
8 TO 68VN(DC) RATING
TA = -55
oC TO 85oC
10
V68ZA05
V56ZA05
V47ZA05
V39ZA05
V33ZA05
V27ZA05
V22ZA05
V18ZA05
V12ZA05
V8ZA05
10-3
2000
1000
500
200
PEAK AMPERES (A)
0.01
0.1
1
10
100
1000
100
0.001
0.0001
V330ZA05
V270ZA05
V240ZA05
V220ZA05
V205ZA05
V180ZA05
V150ZA05
V120ZA05
V10
0ZA05
V82ZA05
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
82 TO 330VN(DC) RATING
TA = -55
oC TO 85oC
ZA Series


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