February 2012 Doc ID 16268 Rev 2 1/10
10
LCDP1521S
Dual line programmable transient voltage suppressor for
SLIC protection
Features
■Dual line programmable transient voltage
suppressor with separated gates
■Wide negative firing voltage range:
VGn = -175 V max.
■Low dynamic switching voltages: VFP and
VDGL
■Low gate triggering current: IGT = 5 mA max
■Peak pulse current: IPP = 40 A (5/310 µs)
■Holding current: IH = 150 mA min.
Benefits
■A Trisil™ is not subject to ageing and provides
a fail safe mode in short circuit for a better
protection.
■Trisils are used to help equipment to meet
various standards such as UL1950, IEC 60950
/ CSA C22.2, UL1459 and TIA-968-A (formerly
FCC part 68).
■Trisils have UL94 V0 resin approved (Trisils
are UL497B approved - file: E136224).
Description
This device has been especially designed to
protect 2 new high voltage, as well as classical
SLICs, against transient overvoltages.
Positive overvoltages are clamped by 2 diodes.
Negative surges are suppressed by 2 thyristors,
their breakdown voltage being referenced to
-VBAT through the gate. Separated gates allow the
SLICs to be supplied by two different voltages.
TM: Trisil ,is a trademark of STMicroelectronics
Figure 1. Functional diagram
SO-8
TIP 1 RING 1
TIP 2 RING 2
Gn1
Gn2
GND
GND
1
2
3
4
8
7
6
5
www.st.com
Characteristics LCDP1521S
2/10 Doc ID 16268 Rev 2
1 Characteristics
Table 1. Compliant with the following standards
STANDARD
Peak
Surge
Voltag e
(V)
Voltag e
Waveform
Required
peak
current (A)
Current
Waveform
Minimum
serial resistor
to meet
standard (Ω)
GR-1089 Core
First level
2500
1000
2/10 µs
10/1000 µs
500
100
2/10 µs
10/1000 µs
23
30
GR-1089 Core
Second level 5000 2/10 µs 500 2/10 µs 46
GR-1089 Core
Intra-building 1500 2/10 µs 100 2/10 µs 2
ITU-T-K20/K21 6000
1500 10/700 µs 150
37.5 5/310 µs 110
0
ITU-T-K20
(IEC61000-4-2)
8000
15000 1/60 ns ESD contact discharge
ESD air discharge
0
0
IEC61000-4-5 4000
4000
10/700 µs
1.2/50 µs
100
100
5/310 µs
8/20 µs
60
27
TIA-968-A, lightning
surge type A
1500
800
10/160 µs
10/560 µs
200
100
10/160 µs
10/560 µs
36
24
TIA-968-A, lightning
surge type B 1000 9/720 µs 25 5/320 µs 0
Table 2. Thermal resistance
Symbol Parameter Value Unit
Rth(j-a) Junction to ambient 170 °C/W
LCDP1521S Characteristics
Doc ID 16268 Rev 2 3/10
.
Figure 2. Electrical characteristics - definitions (Tamb = 25 °C)
Figure 3. Repetitive peak pulse current
Table 3. Absolute ratings (0 °C < Tj < 70 °C, unless otherwise specified)
Symbol Parameter Value Unit
IPP Peak pulse current
10/1000 µs
8/20 µs
10/560 µs
5/310 µs
10/160 µs
1/20 µs
2/10 µs
25
60
25
40
35
60
90
A
ITSM
Non repetitive surge peak on-state
current (50 Hz sinusoidal)
t = 0.2 s
t = 1 s
t = 2 s
t = 15 mn
5
3.5
3
1.3
A
VGn1, VGn2 Negative battery voltage range -40 °C < Tamb < +85 °C -175 V
Tstg Storage temperature range - 55 to + 150 °C
TjOperating junction temperature range - 55 to + 150 °C
TL Maximum lead temperature for soldering during 10 s 260 °C
VR
IPP
IH
IR
VF
I
V
Symbol Parameter
IGT Gate triggering current
IHHolding current
IRG Reverse leakage current GATE / LINE
VGT Gate triggering voltage
VFForward drop voltage LINE / GND
VFP Peak forward voltage LINE / GND
VDGL Dynamic switching voltage GATE / LINE
VGATE GATE / GND voltage
VRG Reverse voltage GATE / LINE
C Capacitance LINE / GND
100
50
%I
PP
tt
t
rp
0
tr: rise time (µs)
tp: pulse duration (µs)
ex: Pulse waveform 10/1000 µs
tr = 10 µs tp = 1000 µs
Characteristics LCDP1521S
4/10 Doc ID 16268 Rev 2
Table 4. Parameters (Tj = 25°C unless otherwise specified)
Symbol Test conditions Min. Typ. Max. Unit
IGT VLINE = -48 V 0.05 5 mA
IHVGn = -48 V 150 mA
VGT at IGT 2.5 V
IRG
VRG = -175 V
VRG = -175 V
Tj = 25 °C
Tj = 85 °C
5
50 µA
VDGL
VGn = -48 V
10/700 µs 1.5 kV RS = 0 Ω I
PP = 37.5 A 5 V
VFIF = 1 A t = 500 µs 2 V
VFP 10/700 µs 1.5 kV RS = 0 Ω I
PP = 37.5 A 8 V
IR
VGn / LINE = -1V, VLINE = -175 V
VGn / LINE = -1V, VLINE = -175 V
Tj = 25 °C
Tj = 85 °C
5
50 µA
CVLINE = -50 V, VRMS = 1 V, F = 1 MHz
VLINE = -2 V, VRMS = 1 V, F = 1 MHz
18
35 pF
Table 5. Recommended gate capacitance
Symbol Component Min. Typ. Max. Unit
CGGate decoupling capacitance 100 220 nF
LCDP1521S Technical information
Doc ID 16268 Rev 2 5/10
2 Technical information
The LCDP1521S is particularly optimized for the new telecom applications such as the fiber
in the loop, the WLL, the remote central office. In this case, the operating voltages are
smaller than in the classical system. This makes the high voltage SLICs particularly suitable.
The schematics of Figure 4 shows the topologies most frequently used for these
applications.
Figure 4. Protection of high voltage SLICs
Figure 5. Non repetitive surge peak on-state current versus pulse duration
TIP1
RING1
SLIC1
-Vbat1
TIP
RING
Fuse or PTC
100 nF
Gn1
Fuse or PTC
SLIC2
Fuse or PTC
TIP2
RING2
TIP2
RING2
Fuse or PTC
100 nF
Gn2
-Vbat2
TIP1
RING1
SLIC1
-Vbat1
TIP
RING
Fuse or PTC
100 nF
Gn1
Fuse or PTC
SLIC2
Fuse or PTC
TIP2
RING2
TIP2
RING2
Fuse or PTC
100 nF
Gn2
-Vbat2
0
5
10
15
I (A)
TSM
t(s)
1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
Technical information LCDP1521S
6/10 Doc ID 16268 Rev 2
Figure 6. Relative variation of holding current versus junction temperature
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
-40-30-20-10 0 1020304050607080
I [T ] / I [T = 25 °C]
Hj Hj
T (°C)
J
LCDP1521S Ordering information scheme
Doc ID 16268 Rev 2 7/10
3 Ordering information scheme
Figure 7. Ordering information scheme
LCDP 15 2 1 S RL
Line card
dual protection
Holding current
15 = 150 mA
Version
2 = devices protected
Package
1 = SO-8
Separated gates
Packaging
RL = Tape and reel
Package information LCDP1521S
8/10 Doc ID 16268 Rev 2
4 Package information
●Epoxy meets UL94, 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. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Table 6. SO-8 dimensions
Ref
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.025 0.033
b 0.35 0.48 0.014 0.019
b1 0.19 0.25 0.007 0.010
C 0.25 0.50 0.50 0.010 0.020
c1 45° (typ)
D 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 3.81 0.150
F 3.8 4.0 0.15 0.157
L 0.4 1.27 0.016 0.050
M 0.6 0.024
S 8° (max)
Figure 8. Footprint dimensions
in mm (inches)
Figure 9. Marking
L
E
D
8
4
5
1
M
S
c1
e
b
e3
A
C
a1b
a3
1
a2
F
6.8
(0.268)
4.2
(0.165)
1.27
(0.050)
0.6
(0.024)
â
XXXXX : Marking
ZZ : Manufacturing location
Y : Year
WW : week z z y w w
x x x x x x
Pin 1
â
XXXXX : Marking
ZZ : Manufacturing location
Y : Year
WW : week zz zz yy ww ww
xx xx xx xx xx xx
Pin 1
LCDP1521S Ordering information
Doc ID 16268 Rev 2 9/10
5 Ordering information
6 Revision history
Table 7. Ordering information
Order code Marking Package Weight Base qty Delivery mode
LCDP1521SRL DP152S SO-8 0.08 g 2500 Tape and reel
Table 8. Document revision history
Date Revision Changes
24-Sep-2009 1First issue.
23-Feb-2012 2Standardized nomenclature for Gn and Gp.
LCDP1521S
10/10 Doc ID 16268 Rev 2
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