Silicon Avalanche Diodes
Axial Leaded Telecommunications Transient Voltage Suppressors
FOLDBAK ? SERIES
Designed to protect sensitive telecommunications electronics from
transients which originate from induced lightning, power cross
and inductive load switching etc., especially where breakover
devices would cause nuisance latch-up.
Typical equipment would be: line cards, PABX, modems,
multiplexers and NTDs.
FEATURES
? Foldback characteristics
? 2200 watts Peak Power rated with 10/1000μS pulse
? 30,000 watts Peak Pulse Power based on 8/20μS
? UL 94V-0 flammability classification
DESCRIPTION
The foldback characteristic of this device eliminates the clamping
of the DC current, or the battery, used in telecom systems, so
latch-up is eliminated. Latch-up can occur with breakover devices
due to the conduction follow-on current supplied by the DC
system, after the device has responded to a transient.
With breakover devices, latch-up will happen more readily as the
ambient temperature rises because the holding current values will
fall with rising temperature.
The Foldbak eliminates this problem while still providing high
levels of protection.
ABSOLUTE MAXIMUM RATINGS @25?C
case temp (unless otherwise noted)
0.966 - 1.066
Min 25.4
4.826
5.207
9.155
9.527
SYMBOL
PPP
PARAMETER
Peak Pulse Current
10x1000μsec
VALUE
2,200
Units
W
8-20μsec
20,000
W
Min 25.4
PM (AV)
Steady state power dissipation,
5.0
W
lead length 9.5mm, TL - 85 ? C (note 1)
Tj
Junction temperature
-55 to 150
?C
T stg
Storage temperature
-55 to 150
?C
All dimensions in mm
Note 1. Mounted on copper pad area 40mm square
Characteristics @25?C case temp (unless otherwise noted)
Ipp
VfB
DEVICE Working Maximum Maximum
Minimum
Maximum
TYPE
voltage breakover
leakage
foldback
Peak Pulse
IBo
(Vr)
Voltage
(Vbo)
current (Ir) voltage Vfb Current (lpp)
@ Vr
@ Vcl Note 2
Irm
volts
volts
μA
volts
amps
VBo
FB120
120
170
1.0
55
170
Vrm
FB160
160
220
1.0
110
220
Note 2. Using 10/1000μS pulse
304
w w w. l i t t e l f u s e . c o m
V-I Characteristic
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