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DSL01-008SC5
Secondary protection for DSL lines
June 2010 Doc ID 13179 Rev 3 1/8
DSL01-xxxSC5Secondary protection for DSL lines
Features Low capacitance devices: DSL01-xxxSC5: Delta Ctyp = 3.5 pF High surge capability: 30 A - 8/20 µs Voltage: 8 V, 10.5 V, 16 V, and 24 V RoHS package
Benefits Transil™ mode will clamp ESD and low energy
surges without disturbing line drivers during
transmission while high energy surges will be
short circuited to avoid line driver damage. The low capacitance makes it suitable for
ADSL2+ and VDSL signals.
Complies with the following standards IEC 61000-4-2, level 4 15 kV (air discharge) 8 kV (contact discharge) MIL STD 883G-Method 3015-7: Class 3 25 kV (Human body model) IEC 61000-4-5, level 2: 24 A, 8/20 µs
Applications Secondary protection to be located after the
transformer of ADSL and VDSL modem either
on central office or subscriber side. Replaces crowbar protection located on
primary side.
TM: Transil and Trisil are trademarks of STMicroelectronics
DescriptionThis device combines a Transil used for low
energy surges and a Trisil™ for high energy
surges. This combination provides a surge /
capacitance trade-off compatible with high debit
rates such as ADSL2+ and VDSL. The
combination on the same die makes it compatible
with SOT23-5L package.
Characteristics DSL01-xxxSC52/8 Doc ID 13179 Rev 3
1 Characteristics
Figure 2. Pulse waveform
Table 1. Absolute maximum ratings (Tamb = 25 °C) For pulse waveform see Figure2.
Table 2. Electrical characteristics (Tamb = 25 °C) Test conditions : VR = 2 V bias, VRMS = 1 V, F = 1 MHz Measured between 1 V and VRM
DSL01-xxxSC5 Application informationDoc ID 13179 Rev 3 3/8
2 Application informationThe DSL01 series has been designed to be implemented after the transformer of a DSL
system to comply with world wide standards such as ITU-T K20/21 and T elecordia GR-1089
without using crowbar protection such as Trisils or gas tube before the transformer.
The planar technology used for the DSL01 provides an excellent trade-off between
capacitance and surge capability, typically 12 pF for the DSL01-008, providing compliance
with Telecordia GR-1089 (500A 2/10µs). But, the key point is the low variation of the
capacitance versus xDSL signal. This is designed to eliminate limitations in signal
performance.
Figure 3 shows the schematic used for a complete protection (differential and common
mode) but in some cases depending on the line driver circuitry only differential or common
can be used.
Figure 3. Differential and common mode protectionThe topology shown in Figure 4 is for differential protection of line drivers and capacitances.
Figure 4. Differential protection of the line drivers
Application information DSL01-xxxSC54/8 Doc ID 13179 Rev 3
The toplogy shown in Figure 5 is for protection connected to the output winding of the
transformer.
Figure 5. Protection connected to the output winding of the transformer
Figure 6. Recommended layoutConcerning Figure6: Pins 1 and 5 must be connected together. Pins 3 and 4 must be connected together. Pin 2 must not be connected.
DSL01-xxxSC5 Ordering information schemeDoc ID 13179 Rev 3 5/8
Ordering information scheme
Figure 7. Ordering information scheme
Package information DSL01-xxxSC56/8 Doc ID 13179 Rev 3
4 Package information Epoxy meets UL 94, V0 Lead-free package
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOP ACK®
specifications, grade definitions and product status are available at: .
ECOPACK® is an ST trademark.
Table 3. SOT23-5L dimensions
Figure 8. Footprint (dimensions in mm) Figure 9. Marking
