ST SMP75-8 User Manual
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®
FEATURES
Bidirectional surge arrestor.
■
Very low stand-off voltage : VRM=8V.
■
High repetitive surge capability :
■
IPP= 75 A (10/1000µs).
Very low capacitance :C<75pF
■
Low leakage current:<2µA
■
DESCRIPTION
The SMP75-8 is a very low voltage transient surge
arrestor especially designed to protect sensitive
telecommunication equipment against lightning
strikes and other transients.
MAIN APPLICATION
XDSL TRANSMISSION EQUIPMENT
SMB
(JEDEC DO-214AA)
SCHEMATIC DIAGRAM
SMP75-8
TRISIL
TM
BENEFITS
■
Protection against high energy surges.
■
Very low breakover voltage : VBO< 15 V, thus
avoiding saturation of transformer.
■
No signal distortion thanks to very low capacitance.
COMPLIES WITH THE FOLLOWING STANDARDS :
- BELLCORE TR-NWT
-000974: 10/1000 µs1kV
10/1000 µs 75A *
- CCITT K20: 10/700 µs4kV
5/310 µs 100A
- VDE 0433: 10/700 µs4kV
5/310 µs 100A
- VDE 0878: 1.2/50 µs4kV
1/20 µs 100A
* withseriesresistor or PTC.
August 2001 - Ed : 2
1/6
SMP75-8
ABSOLUTE MAXIMUM RATINGS (T
amb
= 25°C)
Symbol Parameter Value Unit
I
I
TSM
T
T
Tj
pp
I
stg
Peak pulse current
Non repetitive surge peak on-state current
One cycle
Non repetitive surge peak on-state current
F = 50Hz
Maximum lead temperature for soldering during 10s
Storage temperature range
Maximum junction temperature
10/1000µs
8/20µs
50Hz
60Hz
0.2s
2s
75
250
35
37
14
6
260 °C
-55to+150
150
THERMAL RESISTANCES
Symbol Parameter Value Unit
R
R
th(j-I)
th(j-a)
Junction to leads
Junction to ambient on printed circuit
20 °C/W
100 °C/W
(with standard footprint dimensions)
Note 1: Pulse waveform
%I
PP
A
A
A
A
A
A
°C
°C
10 / 1000 µs tr=10µs tp = 1000 µs
8/20µs tr=8µs tp=20µs
5 / 310 µs tr=5µs tp = 310 µs
1/20µs tr=1µs tp=20µs
2/10µs tr=2µs tp=10µs
ELECTRICAL CHARACTERISTICS (T
Symbol Parameter
V
RM
I
RM
Stand-off voltage
Leakage current at stand-off volt-
age
V
R
V
BR
V
BO
I
H
I
BO
I
PP
Continuous Reverse voltage
Breakdown voltage
Breakover voltage
Holding current
Breakover current
Peak pulse current
amb
= 25°C)
100
50
0
t
r
t
p
2/6
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