TISP5070H3BJ_07 Datasheet, PDF (10/11 Pages) Bourns Electronic Solutions – FORWARD-CONDUCTING UNIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS

TISP5xxxH3BJ Overvoltage Protection Series
ISDN Device Selection
APPLICATIONS INFORMATION
The ETSI Technical Report ETR 080:1993 defines several range values in terms of maximum and minimum ISDN feeding voltages. The
following table shows that ranges 1 and 2 can use a TISP5110H3BJ protector and ranges 3 to 5 can use a TISP5150H3BJ protector.
Range
1
2
3
4
5
Feeding Voltage
Minimum
V
Maximum
V
51
69
66
70
91
99
90
110
105
115
Standoff Voltage
V_DRM
V
-75
-80
-120
Device Name
TISP5095H3BJ
TISP5110H3BJ
TISP5150H3BJ
Impulse Testing
To verify the withstand capability and safety of the equipment, standards require that the equipment is tested with various impulse wave forms.
The table below shows some common values.
Peak Voltage
Voltage
Peak Current
Current
TISP5xxxH3BJ
Standard
Setting
V
Waveshape
µs
Value
A
Waveshape
µs
25 °C Rating
A
2500
2/10
500
2/10
500
GR-1089-CORE
1000
10/1000
100
10/1000
100
1500
10/160
200
10/160
250
800
10/560
100
10/560
160
TIA-968-A
1500
9/720 †
37.5
5/320 †
200
1000
9/720 †
25
5/320 †
200
I3124
1500
0.5/700
37.5
0.2/310
200
1500
37.5
ITU-T K.20/21/45
4000
10/700
100
5/310
200
6000
150
† TIA-968-A terminology for the waveforms produced by the ITU-T recommendation K.21 10/700 impulse generator.
Series
Resistance
Ω
0
0
0
0
0
0
0
If the impulse generator current exceeds the protector’s current rating then a series resistance can be used to reduce the current to the
protector’s rated value and so prevent possible failure. The required value of series resistance for a given waveform is given by the following
calculations. First, the minimum total circuit impedance is found by dividing the impulse generator’s peak voltage by the protector’s rated
current. The impulse generator’s fictive impedance (generator’s peak voltage divided by peak short circuit current) is then subtracted from the
minimum total circuit impedance to give the required value of series resistance. In some cases the equipment will require verification over a
temperature range. By using the rated waveform values from Figure 10, the appropriate series resistor value can be calculated for ambient
temperatures in the range of -40 °C to 85 °C.
If the devices are used in a star-connection, then the ground return protector, Th3 in Figure 13, will conduct the combined current of protectors
Th1 and Th2. Similarly in the bridge connection (Figure 14), the protector Th1 must be rated for the sum of the conductor currents. In these
cases, it may be necessary to include some series resistance in the conductor feed to reduce the impulse current to within the protector’s
ratings.
JANUARY 1998 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.