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參數(shù)資料
| 型號(hào)： | SMT50-68 |
| 廠商： | Littelfuse, Inc. |
| 英文描述： | ELECTRICAL CHARACTERISTICS |
| 中文描述： | 電氣特性 |
| 文件頁(yè)數(shù)： | 1/3頁(yè) |
| 文件大?。?/td> | 221K |
| 代理商： | SMT50-68 |
48
www.littelfuse.com
SMT50
The electrical characteristics of a SMT50 device are similar to
that of a self-gated Triac, but the SMT50 is a two terminal
device with no gate. The gate function is achieved by an
internal current controlled mechanism.
Like the T.V.S. diodes, the SMT50 has a standoff voltage (Vrm)
which should be equal to or greater than the operating
voltage of the system to be protected. At this voltage (Vrm)
the current consumption of the SMT50 is negligible and will
not affect the protected system.
When a transient occurs, the voltage across the SMT50 will
increase until the breakdown voltage (Vbr) is reached. At this
point the device will operate in a similar way to a T.V.S.
device and is in avalanche mode.
The voltage of the transient will now be limited and will only
increase by a few volts as the device diverts more current. As
this transient current rises, a level of current through the
device is reached (Ibo) which causes the device to switch to a
fully conductive state such that the voltage across the device
is now only a few volts (Vt). The voltage at which the device
switched from the avalanche mode to the fully conductive
state (Vt) is known as the Breakover voltage (Vbo). When the
device is in the Vt state, high currents can be diverted
without damage to the SMT50 due to the low voltage across
the device, since the limiting factor in such devices is
dissipated power (V x I).
Resetting of the device to the non-conducting state is
controlled by the current flowing through the device. When
the current falls below a certain value, known as the Holding
Current (Ih), the device resets automatically.
As with the avalanche T.V.S. device, if the SMT50 is subjected
to a surge current which is beyond its maximum rating, then
the device will fail in short circuit mode, ensuring that the
equipment is ultimately protected.
SELECTING A SMT50
COMPLIES WITH THE
FOLLOWING STANDARDS
PEAK SURGE
VOLTAGE
VOLTAGE
WAVEFORM
CURRENT
WAVEFORM
ADMISSIBLE
I
PP
NECESSARY
RESISTOR
(V)
(
μ
S)
(
μ
S)
(A)
(
)
(CCITT) ITU-K20
(CCITT) ITU-K17
VDE0433
VDE0878
IEC-1000-4-5
1000
1500
2000
2000
level 3
10/700
10/700
10/700
1.2/50
10/700
1.2/500
10/160
10/560
9/720
5/310
5/310
5/310
1/20
5/310
8/20
10/160
10/560
5/320
25
38
50
50
50
100
75
55
25
-
-
-
-
-
-
level 4
1500
800
1000
FCC Part 68, lightning surge
type A
FCC Part 68, lightning surge
type B
Bellcore TR-NWT-001089
first level
Bellcore TR-NWT-001089
second level
CNET
I
31-24
12.5
6.5
-
2500
1000
5000
2/10
10/1000
2/10
2/10
10/1000
2/10
150
50
150
11.5
10
11.5
1000
0.5/700
0.8/310
25
-
V
R
V
BR
V
RM
V
BO
I
RM
I
BO
I
H
I
pp
I
V
1. When selecting a SMT50 device, it is important that
the Vrm of the device is equal to or greater than the
the operating voltage of the system.
2. The minimum Holding Current (Ih) must be greater
than the current the system is capable of delivering
otherwise the device will remain conducting following
a transient condition.
V-I Graph illustrating symbols
and terms for the SMT50 surge
protection device.
ELECTRICAL CHARACTERISTICS
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