TISP4070M3AJR-S Bourns Inc., TISP4070M3AJR-S Datasheet - Page 9
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TISP4070M3AJR-S
Manufacturer Part Number
TISP4070M3AJR-S
Description
Sidacs
Manufacturer
Bourns Inc.
Datasheet
1.TISP4080M3AJR-S.pdf
(12 pages)
Specifications of TISP4070M3AJR-S
Breakover Current Ibo Max
24 A
Rated Repetitive Off-state Voltage Vdrm
58 V
Off-state Leakage Current @ Vdrm Idrm
0.005 mA
Forward Voltage Drop
3 V
Mounting Style
SMD/SMT
Package / Case
DO-214AC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TISP4070M3AJR-S
Manufacturer:
BOURNS
Quantity:
240 000
These devices are two terminal overvoltage protectors. They may be used either singly to limit the voltage between two conductors (Figure 12)
or in multiples to limit the voltage at several points in a circuit (Figure 13).
In Figure 12, protector Th1 limits the maximum voltage between the two conductors to ±V (BO) . This configuration is normally used to protect
circuits without a ground reference, such as modems. In Figure 13, protectors Th2 and Th3 limit the maximum voltage between each conduc-
tor and ground to the ±V (BO) of the individual protector. Protector Th1 limits the maximum voltage between the two conductors to its ±V (BO)
value. If the equipment being protected has all its vulnerable components connected between the conductors and ground, then protector Th1
is not required.
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 to 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.
For the FCC Part 68 10/560 waveform, the following values result. The minimum total circuit impedance is 800/75 = 10.7 Ω and the generator’s
fictive impedance is 800/100 = 8 Ω. This gives a minimum series resistance value of 10.7 - 8 = 2.7 Ω. After allowing for tolerance, a 3 Ω ±10%
resistor would be suitable. The 10/160 waveform needs a standard resistor value of 5.6 Ω per conductor. These would be R1a and R1b in
Figure 15 and Figure 16. FCC Part 68 allows the equipment to be non-operational after the 10/160 (conductor to ground) and 10/560 (inter-
conductor) impulses. The series resistor value may be reduced to zero to pass FCC Part 68 in a non-operational mode, e.g. Figure 14. For this
type of design, the series fuse must open before the TISP4xxxM3 fails. For Figure 14, the maximum fuse i
equipment will require verification over a temperature range. By using the rated waveform values from Figure 11, the appropriate series resistor
value can be calculated for ambient temperatures in the range of -40 °C to 85 °C.
AUGUST 2001 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Deployment
Impulse Testing
ITU-T K.20/K.21
† FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K.21 10/700 impulse generator
GR-1089-CORE
(March 1998)
FCC Part 68
Standard
I3124
TISP4xxxM3AJ Overvoltage Protector Series
Figure 12. Two Point Protection
Peak Voltage
Setting
2500
1000
1500
1500
1000
1500
1500
4000
800
V
Wave Shape
Th1
10/1000
Voltage
9/720 †
9/720 †
0.5/700
10/160
10/560
10/700
2/10
µs
APPLICATIONS INFORMATION
Peak Current
Value
37.5
37.5
37.5
500
100
200
100
100
25
A
Figure 13. Multi-Point Protection
Wave Shape
10/1000
Current
5/320 †
5/320 †
0.2/310
10/160
10/560
5/310
2/10
µs
Th1
TISP4XXXM3
25 °C Rating
300
120
100
100
100
100
75
50
A
Th3
Th2
2
t is 2.3 A
Resistance
Series
2x5.6
11
3
0
0
2
Ω
0
0
s. In some cases, the