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參數(shù)資料
| 型號(hào)： | V251DHB34 |
| 廠商： | Littelfuse, Inc. |
| 元件分類： | 壓敏電阻 |
| 英文描述： | Varistor Products - High Energy Industrial |
| 中文描述： | 壓敏電阻器產(chǎn)品-高能源產(chǎn)業(yè) |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大小： | 97K |
| 代理商： | V251DHB34 |
112
www.littelfuse.com
Varistor Products
High Energy Industrial
Power Dissipation Ratings
Should transients occur in rapid succession, the average power
dissipation result 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.The operating values must be derated as shown
in Figure 1.
Transient V-I Characteristics Curves
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O
1
T
T
1
T
2
TIME
P
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front time = 1.25 t
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20
μ
s Current Waveform:
8
μ
s = T
1
= Virtual Front Time
20
μ
s = T
2
= Virtual Time to Half Value
1000
10000
0.001
0.01
0.1
1
10
100
10000
100000
Maximum Clamping Voltage
DHB34 Series
110 to 750V AC Rating
TA = -55 C to 85C
Current - AMPS
Voltage
Volts
V751
V681
V661
V571
V551
V511
V391
V351 V331V321
V271
V251 V201 V181
V151
V141
V111
V131
V301
V481
V441
V421
100
1000
DHB34 Varistor Series
FIGURE 3. CLAMPING VOLTAGE FOR DHB34 SERIES
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