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| 型號(hào)： | 7EL2 |
| 廠商： | Power Innovations International, Inc. |
| 英文描述： | BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS |
| 中文描述： | 雙向可控硅過電壓保護(hù)器 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | 7EL2 |
7EL2
BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
P R O D U C T I N F O R M A T I O N
Information is current as of publication date. Products conform to specifications in accordance
with the terms of Power Innovations standard warranty. Production processing does not
necessarily include testing of all parameters.
Manufactured by TI using silicon designed and manufactured by Power Innovations, Bedford, UK.
1
JANUARY 1999
Copyright 1999, Power Innovations Limited, UK
TELECOMMUNICATION SYSTEM PRIMARY PROTECTION
device symbol
T
R
SD4XAA
Terminals T and R correspond to the
alternative line designators of A and B
T(A)
R(B)
CELL PACKAGE
(SIDE VIEW)
MD4XACA
G
Ion-Implanted Breakdown Region
Precise and Stable Voltage
Low Voltage Overshoot under Surge
G
Rated for International Surge Wave Shapes
G
Gas Discharge Tube (GDT) Replacement
G
Planar Passivated Junctions in a Protected
Cell Construction
Low Off-State Current
Extended Service Life
DEVICE
V
(BR)
MINIMUM
V
±245
V
(BO)
MINIMUM
V
±265
V
(BO)
MAXIMUM
V
±400
7EL2
DEVICE
ITU-T K28
(10/700)
I
TSP
A
±400
GR-974-CORE
(10/1000)
I
TSP
A
±300
7EL2
G
Soldered Copper Electrodes
High Current Capability
Cell Construction Short Circuits Under Excessive Current Conditions
description
These devices are primary protector components for semiconductor arrester assemblies intended to meet the
generic requirements of Bellcore GR-974-CORE (November 1994) or ITU-T Recommendation K28 (03/93).
To conform to the specified environmental requirements, the 7EL2 must be installed in a housing which
maintains a stable microclimate during these tests.
The protector consists of a symmetrical voltage-triggered bidirectional thyristor. Overvoltages are initially
clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to
crowbar into a low-voltage on state. This low-voltage on state causes the current resulting from the
overvoltage to be safely diverted through the device. The high crowbar holding current prevents d.c. latchup
as the diverted current subsides. The 7EL2 is guaranteed to voltage limit and withstand the listed
international lightning surges in both polarities.
These monolithic protection devices are constructed using two nickel plated copper electrodes soldered to
each side of the silicon chip. This packaging approach allows heat to be removed from both sides of the
silicon, resulting in the doubling of the devices thermal capacity, enabling a power line cross current capability
of 10 A rms for 1 second. One of the 7EL2’s copper electrodes is specially shaped to promote a progressive
shorting action (at 50/60 Hz currents greater than 60 A). The assembly must hold the 7EL2 in compression,
so that the cell electrodes can be forced together during overstress testing. Under excessive power line cross
conditions the 7EL2 will fail short circuit, providing maximum protection to the equipment.
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