TISP5070H3 Bourns, Inc., TISP5070H3 Datasheet - Page 10

• Manufacturer Part Number: TISP5070H3
• Description: Forward-conducting Unidirectional Thyristor Overvoltage Protectors
• Manufacturer: Bourns, Inc.

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.
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.
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.
† TIA-968-A terminology for the waveforms produced by the ITU-T recommendation K.21 10/700 impulse generator.
ISDN Device Selection
Impulse Testing
ITU-T K.20/21/45
GR-1089-CORE
Range
TIA-968-A
Standard
TISP5xxxH3BJ Overvoltage Protection Series
1
2
3
4
5
I3124
Minimum
Peak Voltage
105
51
66
91
90
V
Setting
2500
1000
1500
1500
1000
1500
1500
4000
6000
800
V
Feeding Voltage
Waveshape
Maximum
10/1000
Voltage
9/720 †
9/720 †
0.5/700
10/160
10/560
10/700
2/10
µs
110
115
69
70
99
APPLICATIONS INFORMATION
V
Peak Current
Value
37.5
37.5
37.5
500
100
200
100
100
150
25
A
Standoff Voltage
Customers should verify actual device performance in their specific applications.
V
-120
-75
-80
DRM
V
Waveshape
Current
10/1000
5/320 †
5/320 †
0.2/310
10/160
10/560
5/310
2/10
µs
Specifications are subject to change without notice.
TISP5xxxH3BJ
25 °C Rating
JANUARY 1998 - REVISED JANUARY 2007
500
100
250
160
200
200
200
200
A
TISP5095H3BJ
TISP5110H3BJ
TISP5150H3BJ
Device Name
Resistance
Series
Ω
0
0
0
0
0
0
0