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ITAxxB3
Bidirectional TransilTM array for data line protection
Features

High surge capability Transil array: IPP = 40 A (8/20 s) Peak pulse power: 300 W (8/20 s) Separated Input - Output Up to 9 bidirectional Transil functions Low clamping factor (VCL/VBR) at high current level Low leakage current ESD protection up to 15 kV
SO-20
Description
Transil diode arrays provide high overvoltage protection by clamping action. Their instantaneous response to transient overvoltages makes them particularly suited to protect voltage sensitive devices such as MOS technology and low voltage supplied IC's. The ITA series combines high surge capability against energetic pulses with high voltage performance against ESD. The separated input/output configuration of the device ensures improved protection against very fast transient overvoltage like ESD by elimination of the spikes induced by parasitic inductances created by external wiring. Figure 1. Functional diagram
GND INPUT INPUT 1 2 3 20 GND 19 OUTPUT 18 OUTPUT 17 OUTPUT 16 OUTPUT 15 OUTPUT 14 OUTPUT 13 OUTPUT 12 OUTPUT 11 GND
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 3B - 25 kV (human body model)
Applications
Differential data transmission lines protection, such as :

RS-232 RS-423 RS-422 RS-485
INPUT 4 INPUT INPUT INPUT INPUT INPUT
TM: Transil is a trademark of STMicroelectronics
5 6 7 8 9
GND 10
November 2007
Rev 2
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www.st.com 8
Characteristics
ITAxxB3
1
Table 1.
Symbol PPP IPP It Tj Tstg TL
2
Characteristics
Absolute ratings (Tamb = 25 C)
Parameter Peak pulse power (8/20 s)(1) Peak pulse current (8/20 s) Wire I t value
2 (1) (1)
Value Tj initial = Tamb Tj initial = Tamb 300 40 0.6 125 -55 to +150 260
Unit W A A2s C C C
Maximum operating junction temperature Storage temperature range Maximum lead temperature for soldering during 10 s
1. For surges greater than the specified maximum value, the I/O will first present a short-circuit and after an open circuit caused by the wire melting.
Table 2.
Symbol VRM VBR VCL IRM IPP T VF C
Electrical characteristics (Tamb = 25 C)
Parameter
I IPP
Stand-off voltage Breakdown voltage Clamping voltage Leakage current Peak pulse current Voltage temperature coefficient Forward voltage drop Capacitance VBR @ IR IRM max.
(1)
IRM VRM
VCL VBR
V
@
VRM
VCL
@
IPP
VCL max.
(1)
@
IPP
T max.
C max.
(2)
Order code
min.
(1)
8/20 s
8/20 s
V ITA6V5B3 ITA18B3 ITA25B3 6.5 18 25
mA 1 1 1
A 10 4 4
V 5 15 24
V 9.5 21 31
A 10 10 10
V 121 26 36
A 25 25 25
10-4/C 4 9 12
pF 1100 500 420
1. Between I/O pin and ground. 2. Between two input pins at 0 V Bias, F = 1 MHz.
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ITAxxB3
Characteristics
Figure 2.
Pulse waveform
Figure 3.
Typical peak pulse power versus exponential pulse duration
PPP(W)
%IPP
100 8 s
1E+04
ITA25B3 ITA18B3
Tj initial=25C
1E+03
Pulse waveform 8/20 s 50
1E+02
ITA6V5B3
0 20 s
t
1E+01 1E-03 1E-02
tP(ms) expo
1E-01 1E+00 1E+01 1E+02
Figure 4.
Clamping voltage versus peak pulse current (exponential waveform 8/20 s)
VCL(V)
Figure 5.
Peak current IDC inducing open circuit of the wire for one input/output versus pulse duration (typical values)
IDC(A)
1E+03 Tj initial=25C
1E+03
%IPP
100 50
Exponential waveform
1E+02
ITA25B3 ITA18B3
0
tr
tp
t
1E+02
1E+01
ITA6V5B3
1E+01
1E+00 1E-01 1E+00
IPP(A)
1E+01 1E+02
1E+00 1E-02 1E-01
tP(ms)
1E+00 1E+01
Figure 6.
Junction capacitance versus reverse applied voltage for one input/output (typical values)
C(pF)
Figure 7.
Relative variation of leakage current versus junction temperature
1E+03
ITA6V5B3
IR(Tj) IR(Tj=25C)
Tj=25C F=1MHz
5E+3 1E+3 VR=VRM
1E+2
ITA18B3
1E+1
ITA25B3
1E+0
1E+02 1E+00
VR(V)
1E+01 1E+02
Tj(C)
1E-1 0 25 50 75 100 125 150
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Application information
ITAxxB3
2
Application information
This monolithic Transil Array is based on 610 unidirectional Transils with a common cathode and can be configurated to offer up to 9 bidirectional functions. This imposes a maximum differential voltage between 2 input pins (see Table 3). Table 3. Maximum differential voltages
Maximum differential voltage between two input pins at 25C 3.5 v 9.0 v 12.5 v
Order code ITA6V5B3 ITA18B3 ITA25B3
Figure 8.
RS-232 junction (typical application)
TX RX RTS CTS DTR DSR CARRIER DET. AUX GND
2.1
Design advantage of ITAxxB3 used with 4-point structure
The ITAxxxB3 has been designed with a 4-point structure Figure 9. The 4 point structure (separated Input/output) to efficiently protect against disturbances with very high di/dt rates, such as ESD. Chip The purpose of this 4-point structure is to eliminate the Output 1 Input 1 overvoltage introduced by the parasitic inductances of the BE di/dt wiring (Ldi/dt). U TO D E TE IC EC VT GND GND Efficient protection depends not only on the component DE RO P itself, but also on the circuit layout. The drawing given in figure 9 shows the layout to be used in order to take advantage of the 4-point structure of the ITAxxxB3. With this layout, each line to be protected passes through the protection device. In this way, it realizes an interface between the data line and the circuit to be protected, guaranteeing an isolation between its inputs and outputs.
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ITAxxB3
Ordering information scheme
3
Ordering information scheme
Figure 10. Ordering information scheme
ITA
Integrated Transil Array Breakdown Voltage (min) 25 = 25 Volt Type of lines protected B = Bidirectional Package 3 = SO-20 Packaging RL = Tape and reel Blank = Tube
25
B
3
RL
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Package information
ITAxxB3
4
Package information
Epoxy meets UL94, V0
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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. Table 4. SO-20 dimensions
Dimensions Ref. Millimeters Min.
D hx45
Inches Min. 0.092 0.004 0.013 0.009 0.484 0.291 0.050 Typ. Max. 0.104 0.008 0.020 0.013 0.512 0.299 0.419 0.029 0.050
Typ.
Max. 2.65 0.30 0.51 0.32 13.0 7.60
A A1 B C D E
2.35 0.10 0.33 0.23 12.6 7.40 1.27 10.0 0.25 0.40
A K B e A1 L C
E
H
e H h L K
10.65 0.394 0.75 1.27 0.010 0.016
8 (max)
Figure 11. SO-20 footprint (dimensions in mm)
8.5
11.2
1.27
0.6
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ITAxxB3
Ordering Information
5
Ordering Information
Table 5. Ordering information
Marking ITA6V5B3 ITA18B3 ITA18B3 ITA25B3 ITA25B3 SO-20 0.55 g Package Weight Base qty 1000 1000 1000 1000 1000 Delivery mode Tube Tube Tape and reel Tube Tape and reel
Order code ITA6V5B3 ITA18B3 ITA18B3RL ITA25B3 ITA25B3RL
6
Revision history
Table 6.
Date 13-Dec-2004 07-Nov-2007
Document revision history
Revision 1 2 Initial release. Reformatted to current standards. Updated leakage current values in Table 2 Updated pulse waveform parameters in Figure 2. Changes
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ITAxxB3
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