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BL758L Datasheet(PDF) 1 Page - Bourns Electronic Solutions

Part # BL758L
Description  INTEGRATED SYMMETRICAL AND ASYMMETRICAL BIDIRECTIONAL OVERVOLTAGE PROTECTORS FOR LUCENT TECHNOLOGIES L7581/2/3 LINE CARD ACCESS SWITCHES
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Manufacturer  BOURNS [Bourns Electronic Solutions]
Direct Link  http://www.bourns.com
Logo BOURNS - Bourns Electronic Solutions

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TISPL758LF3D - INTEGRATED SYMMETRICAL AND
ASYMMETRICAL BIDIRECTIONAL OVERVOLTAGE PROTECTORS FOR
LUCENT TECHNOLOGIES L7581/2/3 LINE CARD ACCESS SWITCHES
PRODUCT
INFORMATION
1
JANUARY 1998 - REVISED AUGUST 2002
Specifications are subject to change without notice.
OVERVOLTAGE PROTECTION FOR LUCENT TECHNOLOGIES LCAS
q
Symmetrical and Asymmetrical
Characteristics for Optimum Protection of
Lucent L7581/2/3 LCAS
q
Rated for International Surge Wave Shapes
q
Ion-Implanted Breakdown Region
Precise And Stable Voltage
Low Voltage Overshoot Under Surge
q
Planar Passivated Junctions
Low Off-State Current
< ±10 µA
q
Small Outline Surface Mount Package
- Available Ordering Options
description
The TISPL758LF3 is an integrated combination
of
a
symmetrical
bidirectional
overvoltage
protector and an asymmetrical bidirectional
overvoltage protector. It is designed to limit the
peak voltages on the line terminals of the Lucent
Technologies
L7581/2/3
LCAS
(Line
Card
Access Switches). An LCAS may also be
referred to as a Solid State Relay, SSR, i.e. a
replacement
of
the
conventional
electro-
mechanical relay.
The TISPL758LF3D voltages are chosen to give
adequate
LCAS
protection
for
all
switch
conditions.
The
most
potentially
stressful
TERMINAL
PAIR
VDRM
V
V(BO)
V
T-G (SYMMETRICAL)
±105
±130
R-G (ASYMMETRICAL)
+105, -180
+130, -220
CUSTOMISED VERSIONS AVAILABLE
WAVE SHAPE
STANDARD
ITSP
A
2/10 µs
GR-1089-CORE
175
8/20 µs
ANSI C62.41
120
10/160 µs
FCC Part 68
60
10/700 µs
ITU-T K20/21
50
10/560 µs
FCC Part 68
45
10/1000 µs
GR-1089-CORE
35
CARRIER
ORDER #
Tube
TISPL758LF3D
Taped and reeled
TISPL758LF3DR
condition is low level power cross when the
LCAS switches are closed. Under this condition,
the
TISPL758LF3D
limits
the
voltage
and
corresponding LCAS dissipation until the LCAS
thermal trip operates and opens the switches.
Under open-circuit ringing conditions, the line
ring (R) conductor will have high peak voltages.
For battery backed ringing, the ring conductor
will have a larger peak negative voltage than
positive i.e. the peak voltages are asymmetric.
An overvoltage protector with a similar voltage
asymmetry will give the most effective protection.
On a connected line, the tip (T) conductor will
have much smaller voltage levels than the open-
circuit ring conductor values. Here a symmetrical
voltage protector gives adequate protection.
Overvoltages are normally caused by a.c. power
system or lightning flash disturbances which are
induced or conducted on to the telephone line.
These overvoltages are initially clipped by
protector breakdown clamping until the voltage
rises to the breakover level, which causes the
device symbol
MDXXAE
D PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
G
G
G
G
NC
T
R
NC
NC - No internal connection
G
T
R
SD3XAA
Terminals T, R and G correspond to the
alternative line designators of A, B and C
Support from the Microelectronics Group of Lucent Technologies Inc. is gratefully acknowledged in the definition of
the TISPL758LF3D voltage levels and for performing TISPL758LF3D evaluations.


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