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參數(shù)資料
| 型號： | V240CH8 |
| 廠商： | Littelfuse, Inc. |
| 元件分類： | 壓敏電阻 |
| 英文描述： | Surface Mount Varistors - Transient Voltage Surge Suppressor |
| 中文描述： | 表面貼裝壓敏電阻-瞬態(tài)電壓浪涌抑制器 |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 301K |
| 代理商： | V240CH8 |
Surface Mount Varistors
197
www.littelfuse.com
Transient Voltage Surge Suppressor
CH Varistor Series
Power Dissipation Ratings
Continuous power dissipation capability is not an applicable design
requirement for a suppressor, unless transients occur in rapid succession.
Under this condition, 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 tempera-
tures 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.
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
AMBIENT TEMPERATURE (
o
C)
80
90
100
110
120
130
140
150
P
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
FIGURE 3. CLAMPING VOLTAGE FOR V22CH8 - V68CH8
500
400
300
200
190
80
60
50
40
30
20
10
10
-3
M
PEAK AMPERES (A)
10
-2
10
-1
10
0
10
1
10
2
10
3
V47CH8
V39CH8
V33CH8
V27CH8
V22CH8
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
22 TO 56V
N(DC)
RATING
T
A
= -55
o
C TO 125
o
C
V56CH8
FIGURE 4. CLAMPING VOLTAGE FOR V120CH8 - V430CH8
4,000
3,000
2,000
1,900
800
700
500
400
300
200
100
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
V180CH8
V150CH8
V120CH8
V430CH8
V390CH8
V360CH8
V240CH8
VV220CH8
PEAK AMPERES (A)
M
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
100 TO 430V
RATING
T
A
= -55
C TO 125
C
Transient V-I Characteristics Curves
Pb
RoHS
3
S
V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| V240CH8S | 功能描述:壓敏電阻 150V 250A 100pF Bulk Pack RoHS:否 制造商:EPCOS 產(chǎn)品:MLV 電壓額定值 DC:22 V 電壓額定值 AC:17 V 鉗位電壓:50 V 直徑: 峰值浪涌電流:30 A 浪涌能量額定值:75 mJ 電容:74.2 pF 工作溫度范圍:- 55 C to + 125 C 安裝:SMD/SMT 封裝:Reel |
| V240CH8T | 功能描述:壓敏電阻 150V 250A 100pF 7 Inch Reel RoHS:否 制造商:EPCOS 產(chǎn)品:MLV 電壓額定值 DC:22 V 電壓額定值 AC:17 V 鉗位電壓:50 V 直徑: 峰值浪涌電流:30 A 浪涌能量額定值:75 mJ 電容:74.2 pF 工作溫度范圍:- 55 C to + 125 C 安裝:SMD/SMT 封裝:Reel |
| V240CP16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| V240CP20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| V240CP22 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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