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SMP100MC-400
Trisil™ for telecom equipment protection
February 2012 Doc ID 9699 Rev 5 1/13
SMP100MC risil™ for telecom equipment protection
Features Bidirectional crowbar protection Voltage: range from 140 V to 400 V Low VBO / VR ratio Micro capacitance from 15 pF to 30 pF @ 50 V Low leakage current: IR = 2 µA max Holding current: IH = 150 mA min. Repetitive peak pulse current:
IPP = 100 A (10/1000 µs)
Benefits Trisils are not subject to ageing and provide a
fail safe mode in short circuit for better
protection. Helps equipment meet main standards such as
UL60950, IEC 950 / CSA C22.2 and UL1459. Epoxy meets UL94, V0. Package is JEDEC registered (DO-214AA).
Complies with the following standards GR-1089 Core ITU-T-K20/K21 IEC 61000-4-5 TIA/EIA IS-968 UL497B recognized, UL file E136224
ApplicationsAny sensitive equipment requiring protection
against lightning strikes and power crossing: Terminals (phone, fax, modem...) and central
office equipment ADSL2+ and low end VDSL
DescriptionThe SMP100MC is a series of micro capacitance
transient surge arrestors designed for the
protection of high debit rate communication
equipment. Its micro capacitance avoids any
distortion of the signal and is compatible with
digital transmission line cards (ADSL, VDSL,
ISDN...).
SMP100MC series has been tested and
confirmed compatible with Cooper Bussmann
Telecom Circuit Protector TCP 1.25 A.
TM: Trisil is a trademark of STMicroelectronics.
Characteristics SMP100MC2/13 Doc ID 9699 Rev 5
1 Characteristics Table 1. In compliance with the following standards
SMP100MC Characteristics
Doc ID 9699 Rev 5 3/13
Figure 1.
Table 2. Absolute ratings (Tamb = 25 °C) In fail safe mode the device acts as a short circuit.
Table 3. Thermal resistances
Characteristics SMP100MC
4/13 Doc ID 9699 Rev 5
Table 4. Electrical characteristics - values (Tamb = 25 °C) See Figure 16: Test circuit 1 for Dynamic IBO and VBO parameters See Figure 17: Test circuit 2 for IBO and VBO parameters See Figure 18: Test circuit 3 for dynamic IH parameter VR = 50 V bias, VRMS=1V, F=1 MHz VR = 2 V bias, VRMS=1V, F=1 MHz
SMP100MC Characteristics
Doc ID 9699 Rev 5 5/13
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 reverse voltage
applied (typical values)
Application information SMP100MC
6/13 Doc ID 9699 Rev 5
2 Application information
In wire line 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
Figure 10. Examples of protection stages for line cards
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 protect 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, TIA/EIA IS-968,
ITU-T K20.
Figure 8. Variation of thermal impedance
junction to ambient versus pulse
duration
Figure 9. Relative variation of junction
capacitance versus reverse voltage
applied (typical values)
SMP100MC Application information
Doc ID 9699 Rev 5 7/13
Figure 11. Typical circuits
Figure 12. Test method of the board having fuse and Trisil
These topologies, using SMP100MC from ST and TCP1.25 A from Cooper Bussmann, have
been functionally validated with a Trisil glued on the PCB. Following example was performed
with SMP100MC-270 Trisil. For more information, see Application Note AN2064.
Figure 13. Trisil turns on during lightning surge
Test conditions:
2/10 µs + and -2.5 and 5 kV 500 A (10 pulses of each polarity), Tamb = 25 °C
Test result:
Fuse and Trisil OK after test in accordance with GR1089 requirements.
