January 2008 Rev 6 1/8
DA108S1
DA112S1
Diode array
Features
■Array of 8 or 12 diodes
■Low input capacitance
■Suitable for digital line protection
Complies with following standards:
■IEC 61000-4-2 Level 4
– 15kV (air discharge)
– 8kV (contact discharge)
Applications
■Protection of logic side of ISDN S-interface
■Protection of I/O lines of microcontroller
■Signal conditioning
Description
Array of 8 or 12 diodes configured by cells of 2
diodes, each cell being used to protect signal line
from transient overvoltages by clamping action.
As maximum voltage of each diode is 18 V,
maximum input voltage range between two I/Os is
either 0 V to 18 V (REF1 = 0 V and REF2 =
+18 V) or -9 V to +9 V (REF1 = -9 V and REF2 =
+9 V)
Figure 1. Functional diagram: DA108S1
Figure 2. Functional diagram: DA112S1
SO-8
I/O1 REF1
REF2
REF3
REF4
I/O2
I/O3
I/O4
I/O1 18
27
36
45
REF1
I/O6
REF2
I/O5
I/O2
I/O3
I/O4
www.st.com
Characteristics DA108S1 / DA112S1
2/8
1 Characteristics
1.
Table 1. Absolute maximum ratings (Tamb = 25 °C)
Symbol Parameter Value Unit
VRRM Repetitive peak reverse voltage (for one single diode) 18 V
IPP Repetitive peak forward current (1) tp = 8/20 µs 12 A
P Power dissipation 0.73 W
Tstg Storage temperature range -55 to +150 °C
TjOperating junction temperature range -55 to +150 °C
TLMaximum lead temperature for soldering during 10 s. 260 °C
1. The surge is repeated after the device returns to ambient temperature
Table 2. Thermal resistance
Symbol Parameter Value Unit
Rth (j-a) Junction to ambient 170 °C/W
Table 3. Electrical characteristics(Tamb = 25 °C)
Symbol Parameter Max. Unit
VFP Peak forward voltage IPP = 12 A,
tp = 8/20 µs
DA108S1 9 V
DA112S1 12
VFForward voltage IF = 50 mA 1.2 V
IRReverse leakage current VR = 15 V 2 µA
DA108S1 / DA112S1 Characteristics
3/8
Figure 3. Input capacitance
Figure 4. Typical peak forward voltage characteristics (8/20 µs pulse)
22
24
26
28
30
32
34
36
2468101214160
C (pF)
G
I/O
VCC
REF2
REF1
DC bias (V)
V = 5 V
CC
V = 15 V
CC
Typical values
V connected between REF1 and REF2
Input applied :
DC bias + 950 mV at 1 MHZ
CC
(RMS)
V
F
(V)
0.001 0.01 0.1 1
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Tj = 25 C
o
I
F
(A)
Typical values
V
F
(V)
110
20
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Typical values
I
F
(A)
Tj = 25 C
o
Characteristics DA108S1 / DA112S1
4/8
Figure 5. Application 1: ISDN interface protection, residual lightning surges at
transformer secondary are suppressed by DA108S1
Figure 6. Application 2: microcontroller I/O port protection
Note: IMPORTANT : DA108S1 must be connected to the reference voltages through REF1 and
REF2.
A
B
A
B
GND
GND
TPIxx
TPIxx
LINE SIDE
LOGIC SIDE
DA1x S1x
Vcc
Vcc
Vcc
Vcc
Vss
Vss
Vss
Vss
DA1x S1x
4-6 bit input port
Vcc
Vcc
Vcc
Vcc
Vcc
I/O
I/O
I/O
I/O
μc
DA108S1 / DA112S1 Ordering information scheme
5/8
2 Ordering information scheme
Figure 7. Ordering information scheme
DA 1 08 S 1 RL
Diode Array
Version
Packaging
08 = 12
12 = 12
1 = SO-8
Number of diodes
Serial
Package
RL = Tape and reel
Blank = Tube
Package mechanical data DA108S1 / DA112S1
6/8
3 Package mechanical data
●Epoxy meets UL94, V0
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at www.st.com.
Figure 8. SO-8 footprint dimensions in mm (inches)
Table 4. SO-8 dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A1.750.069
A1 0.1 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
C 0.17 0.23 0.007 0.009
D 4.80 4.90 5.00 0.189 0.193 0.197
E 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
L1 1.04 0.041
k°0808
ccc 0.10 0.004
E1
D
8
4
1
5
E
e
A
A2
bA1
ccc C
k
h x 45°
L
L1
C
(Seating
Plane) 0.25mm
(Gage Plane)
C
6.8
(0.268)
4.2
(0.165)
1.27
(0.050)
0.6
(0.024)
DA108S1 / DA112S1 Ordering information
7/8
4 Ordering information
Figure 9. Ordering information
5 Revision history
Figure 10. Revision history
Order codes Marking Package Weight Base qty Delivery mode
DA108S1 DA108S
SO-8 0.11 g
100 Tube
DA108S1RL 2500 Tape and reel(1)
1. Prefered packaging is tape and reel
DA112S1 DA112S 100 Tube
DA112S1RL 2500 Tape and reel(1)
Date Revision Changes
Aug-2001 4Previous release.
15-Feb-2007 5Reformatted to current standard.
Standard typing error corrected.
15-Jan-2008 6
Reformatted to current standards. Added paragraph on maximum
input voltage range to Description. Parameters updated in Table 1 .
Added Pin 1 marker to package illustration. Added Figure 8: SO-8
footprint dimensions in mm (inches).
DA108S1 / DA112S1
8/8
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