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SMP100LC-320 |SMP100LC320STN/a100000avaiTRISIL FOR TELECOM EQUIPMENT PROTECTION
SMP100LC-360 |SMP100LC360ST N/a100000avaiTRISIL FOR TELECOM EQUIPMENT PROTECTION
SMP100LC-400 |SMP100LC400ST N/a100000avaiTRISIL FOR TELECOM EQUIPMENT PROTECTION
SMP100LC-400 |SMP100LC400STMN/a2006avaiTRISIL FOR TELECOM EQUIPMENT PROTECTION


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SMP100LC-320-SMP100LC-360-SMP100LC-400
TRISIL FOR TELECOM EQUIPMENT PROTECTION
1/10
SMP100LC

TRISIL™ FOR TELECOM EQUIPMENT PROTECTION
REV. 10
December 2004
FEATURES
Bidirectional crowbar protection Voltage range from 8V to 400V Low capacitance from 20pF to 45pF @ 50V Low leakage current : IR = 2µA max Holding current: IH = 150 mA min Repetitive peak pulse current:
IPP = 100 A (10/1000µs)
MAIN APPLICATIONS

Any sensitive equipment requiring protection
against lightning strikes and power crossing.
These devices are dedicated to central office pro-
tection as they comply with the most stressfull
standards.
Their Low Capacitances make them suitable for
ADSL.
DESCRIPTION

The SMP100LC is a series of low capacitance
transient surge arrestors designed for the protec-
tion of high debit rate communication equipment.
Its low capacitance avoids any distortion of the sig-
nal and is compatible with digital transmission line
cards (xDSL, ISDN...).
Compatible with Cooper Bussmann fuse:
TCP 1.25A.
BENEFITS

Trisils are not subject to ageing and provide a fail
safe mode in short circuit for a better protection.
They are used to help equipment to meet main
standards such as UL60950, IEC950 / CSA C22.2
and UL1459. They have UL94 V0 approved resin.
SMB package is JEDEC registered (DO-214AA).
Trisils comply with the following standards GR-
1089 Core, ITU-T-K20/K21, VDE0433, VDE0878,
IEC61000-4-5 and FCC part 68.
Table 1: Order Codes
Figure 1: Schematic Diagram
SMP100LC
Table 2: In compliance with the following standards
Table 3: Absolute Ratings (Tamb = 25°C)
Note 1: in fail safe mode, the device acts as a short circuit
SMP100LC
3/10
Table 4: Thermal Resistances
Table 5: Electrical Characteristics (Tamb = 25°C)
Note 1:
IR measured at VR guarantee VBR min ≥ VR
Note 2:
see functional test circuit 1
Note 3:
see test circuit 2
Note 4:
see functional holding current test circuit 3
Note 5:
VR = 50V bias, VRMS=1V, F=1MHz
Note 6:
VR = 2V bias, VRMS=1V, F=1MHz
SMP100LC
Figure 2: Pulse waveform Figure 3: Non repetitive surge peak on-state
current versus overload duration
Figure 4: On-state voltage versus on-state
current (typical values)
Figure 5: Relative variation of holding current
versus junction temperature
Figure 6: Relative variation of breakover
voltage versus junction temperature
Figure 7: Relative variation of leakage current
versus junction temperature (typical values)
SMP100LC
5/10
APPLICATION NOTE

In such a stage, parallel function is assumed by one or several Trisil, and is used to protect against short
duration surge (lightning). During this kind of surges the Trisil limits the voltage across the device to be
protected at its break over value and then fires. The fuse assumes the series function, and is used to pro-
tect the module against long duration or very high current mains disturbances (50/60Hz). It acts by safe
circuits opening. Lightning surge and mains disturbance surges are defined by standards like GR1089,
FCC part 68, ITU-T K20.
Figure 8: Variation of thermal impedance
junction to ambient versus pulse duration
(Printed circuit board FR4, SCu=35µm,
recommended pad layout)
Figure 9: Relative variation of junction
capacitance versus reverse voltage applied
(typical values)

In wireline applications, analog or digital, both central office and subscriber sides have to be protected.
This function is assumed by a combined series / parallel protection stage.
SMP100LC
Following figure shows the test method of the
board having Fuse and Trisil.
Following curve shows the turn on of the Trisil during
lightning surge.
These topologies, using SMP100LC from ST and
TCP1.25A from Cooper Bussmann, have been
functionally validated with a Trisil glued on the
PCB. Following example was performed with
SMP100LC-270 Trisil. For more information, see
Application Note AN2064.
Test conditions:

2/10µs + and -2.5 and 5kV 500A (10 pulses of each
polarity), Tamb = 25°C
Test result:

Fuse and Trisil OK after test in accordance with
GR1089 requirements
Following curve shows Trisil action while the fuse
remains operational.
In case of high current power cross test, the fuse acts
like a switch by opening the circuit.
Test conditions:

600V 3A 1.1s (first level), Tamb = 25°C
Test result:

Fuse and Trisil OK after test in accordance with
GR1089 requirements
Test conditions:

277V 25A (second level), Tamb = 25°C
Test result:

Fuse safety opened and Trisil OK after test in
accordance with GR1089 requirements
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