TISP4300H3LMFR Bourns Inc., TISP4300H3LMFR Datasheet - Page 10

• Manufacturer Part Number: TISP4300H3LMFR
• Description: SURGE SUPP THYRISTOR 230V TO-92
• Manufacturer: Bourns Inc.

Specifications of TISP4300H3LMFR

• Package / Case: TO-92-2, TO-226AC
• Voltage - Breakover: 300V
• Voltage - Off State: 230V
• Voltage - On State: 3V
• Current - Peak Pulse (8 X 20µs): 300A
• Current - Peak Pulse (10 X 1000µs): 100A
• Current - Hold (ih): 150mA
• Number Of Elements: 1
• Capacitance: 62pF
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
protect circuits without a ground reference, such as modems. In Figure 13, protectors Th2 and Th3 limit the maximum voltage between each
conductor and ground to the ±V
±V
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 fi ctive 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 verifi cation 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.
The protector can withstand currents applied for times not exceeding those shown in Figure 8. Currents that exceed these times must be
terminated or reduced to avoid protector failure. Fuses, PTC (Positive Temperature Coeffi cient) resistors and fusible resistors are overcurrent
protection devices which can be used to reduce the current fl ow. Protective fuses may range from a few hundred milliamperes to one am-
pere. In some cases, it may be necessary to add some extra series resistance to prevent the fuse opening during impulse testing. The current
versus time characteristic of the overcurrent protector must be below the line shown in Figure 8. In some cases, there may be a further time
limit imposed by the test standard (e.g. UL 1459 wiring simulator failure).
Deployment
Impulse Testing
AC Power Testing
(BO)
TISP4xxxH3LM Overvoltage Protector Series
value. If the equipment being protected has all its vulnerable components connected between the conductors and ground, then
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
Figure 12. Two Point Protection
I3124
(BO)
Peak Voltage
of the individual protector. Protector Th1 limits the maximum voltage between the two conductors to its
Setting
2500
1000
1500
1500
1000
1500
1500
4000
Th1
800
V
Waveform
10/1000
Voltage
9/720 †
9/720 †
0.5/700
.
10/160
10/560
10/700
2/10
APPLICATIONS INFORMATION
µs
Peak Current
Value
37.5
37.5
37.5
500
100
200
100
100
25
A
Customers should verify actual device performance in their specifi c applications.
Figure 13. Multi-point Protection
Waveform
Current
10/1000
5/320 †
5/320 †
0.2/310
10/160
10/560
5/310
2/10
µs
(BO)
Th1
. This confi guration is normally used to
25 °C Rating
TISP4xxxH3
500
100
250
160
200
200
200
200
Specifi cations are subject to change without notice.
A
Th3
Th2
NOVEMBER 1997 - REVISED JANUARY 2010
Resistance
Series
Ω
0
0
0
0
0
0
0