STMICROELECTRONICS ITA18C1

ITA6V5C1 / ITA10C1
ITA18C1 / ITA25C1
MONOLITHIC TRANSIL ARRAY FOR DATA LINE PROTECTION
FEATURES
HIGH SURGE CAPABILITY TRANSIL ARRAY
IPP = 40 A 8/20µs
UP TO 5 BIDIRECTIONAL TRANSIL FUNCTIONS
BREAK DOWN VOLTAGE AND MAXIMUM DIFFERENTIAL VOLTAGE BETWEEN TWO
INPUT PINS :
ITA6V5 = 6.5 V
ITA10 = 10 V
ITA18 = 18 V
ITA25 = 25 V
LOW CLAMPING FACTOR (VCL / VBR) AT HIGH
CURRENT LEVEL
LOW LEAKAGECURRENT
LOW INPUT CAPACITANCE
SO8
DESCRIPTION
This is a specific transil array for RS232, RS423 interface protection developed in monolithic chip
form in order to provide a high surge capability and
a low clamping voltage
FUNCTIONAL DIAGRAM
IN ACCORDANCE WITH :
- ESD standard :
. IEC 801-2
. IEC 801-4
. IEC 801-5
15kV 5ns / 50ns
40A
5ns / 50ns
1kV
1.2 / 50µs
25A
8 / 20µs
. MIL STD 883C - Method 3015-2
VP = 25kV
C = 150pF
R = 150Ω
5 s duration
- Human body test :
VP = 4kV
C = 150pF
R = 150Ω
I/01 1
8 GND
I/02 2
7
I/03 3
6
I/04 4
5 GND
EQUIVALENT TO 4 BIDIRECTIONAL TRANSILS
April 1998 - Ed: 3
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ITA6V5C1/ ITA10C1 / ITA18C1 / ITA25C1
ABSOLUTE RATINGS (limiting values) (0°C ≤ Tamb ≤ 70°C)
Symbol
Parameter
Value
Unit
IPP
Peak pulse current for 8/20 µsexponential
pulse
See note
40
A
I2 t
Wire I2 t value
See note
0.6
A2s
- 55 to + 150
125
°C
°C
T stg
Tj
Storage and Junction Temperature Range
Note :
%I pp
For surges greater than the maximum value specified, the
input/output will present first a short circuit to the common
bus line and after an open circuit caused by the wire.
8 s
100
Pulse wave form 8/20 s
50
0
t
20 s
ELECTRICAL CHARACTERISTICS
Symbol
IRM
VRM
I PP
Leakage Current @ VRM
IR
Stand-off Voltage
VBR
Breakdown Voltage
VCL
Clamping Voltage
IPP
Surge Current
C
Input Capacitance
IRM @ VRM
Types
I
Parameter
max
VBR @
V BR
I RM
V
V RM
IR
VCL @ IPP
min
8/20µs
Note 1
Note 1
V CL
VCL
IPP
C1
C2
αT
max
8/20µs
max
max
max
Note 2
Note 3
Note 1
-4
µA
V
V
mA
V
A
V
A
pF
pF
10 /°C
ITA6V5C1
10
5
6.5
1
10
10
12
25
750
550
4
ITA10C1
10
8
10
1
15
10
19
25
570
260
8
ITA18C1
4
15
18
1
25
10
28
25
350
180
9
ITA25C1
4
24
25
1
33
10
38
25
300
100
12
All parameters tested at 25°C, except where indicated.
Note 1: Between I/O pin and ground.
Note 2: Between two input Pins at 0 V Bias.
Note 3: Between two input Pins at VRM.
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ITA6V5C1 / ITA10C1 / ITA18C1 / ITA25C1
Fig.1 : Typical Peak pulse power versus exponential pulse duration.
1E+04
PP
Fig.2 : Clamping voltage versus peak pulse current exponentialwaveform 8/20 µs.
(W)
o
1E+03
V CL (V)
T j initial = 25 C
ITA25C1
ITA18C1
1E+03 ITA10C1
ITA6V5C1
% I PP
tr = 8
100
50
0
tr t
1E+02
s
t
ITA25C1
ITA18C1
ITA10C1
1E+01 ITA6V5C1
1E+02
1E+01
1E-03
t P (ms) expo
1E-02
1E-01
1E+00
1E+01
I PP (A)
1E+00
1E+02
Fig.3 : Peak current I DC inducing open circuit of the
wire for one input/output versus pulse duration
(typical values).
1E+03
T j initial = 25 o C
I DC (A)
1E-01
1E+00
1E+01
1E+02
Fig.4 : Junction capacitance versus reverse applied voltage for one input/output(typical values).
C (pF)
1E+03
exponential waveform
T j = 25 o C
ITA6V5C1
f = 1 MHz
1E+02
ITA10C1
ITA18C1
1E+01
ITA25C1
1E+00
1E-02
t
1E-01
1E+00
(ms)
V R (V)
1E+02
1E+01
1E+00
1E+01
1E+02
Note :
The curve of the figure 2 is specified for a junction temperature of 25°C before surge.
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ITA6V5C1/ ITA10C1 / ITA18C1 / ITA25C1
APPLICATION NOTICE
Types
Maximum differential voltage between two input pins at 25°C
V
ITA6V5C1
6.5
ITA10C1
10
ITA18C1
18
ITA25C1
25
INSTRUCTION GUIDE
This monolithic Transil Array is based on 6 Unidirectional Transils with a common cathode and can be configurated to offer 4 or 5 bidirectional functions, according to the following customer application.
Fig 5 : EQUIVALENT TO 4 BIDIRECTIONAL TRANSILS
T1
T2
I/O1 1
8 GND
I/O2 2
7
I/O3 3
6
T3
I/O4 4
5 GND
Fig 6 : EQUIVALENT TO 5 BIDIRECTIONAL TRANSILS
I/O1 1
T1
T2
8 GND
I/O2 2
7
I/O3 3
6
I/O4 4
5 I/O5
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UTILIZATION AS A BIDIRECTIONAL TRANSIL
ARRAY WITH 4 I/Os.
The main applicationof this device is to be configurated as a 4, bidirectional Transil Array as per the
Pin-out of Fig 5.
Pins 5 and 8 are connected to ground.
INPUTS/OUTPUTS are from Pin 1 to Pin 4.
Note : Thebidirectional functionis made with 2 unidirectional Transils. One (T1) is connected to the
INPUT/OUTPUT, the other one (T2) is connected
to the ground (see Fig 5).
Ground is connected via 2 diodes T2 and T3 .
This allows to withstand 2 specified surges on 2 different lines at the same time.
UTILIZATION AS A BIDIRECTIONAL TRANSIL
ARRAY WITH 5 I/Os.
The ITAxxC1 can be used as a 5 bidirectional
Transil Array.
Ground can be connected to any pin (except 6 and
7).
The other pins are used as INPUTS and OUTPUTS.
The bidirectional function is made with 2 unidirectional Transils T1 and T2. One example with
ground on Pin 8 is shown in Fig 6.
This configuration allows to withstand only one
specified surge at the same time.
ITA6V5C1 / ITA10C1 / ITA18C1 / ITA25C1
ORDER CODE
ITA 25 C 1
PACKAGE
1=SO8 PLASTIC
INTEGRATED
TRANSIL ARRAY
VBR min
COMMON GROUND
MARKING
TYPE
ITA6V5C1
ITA10C1
ITA18C1
ITA25C1
MARKING
6V5C1
10C1
18C1
25C1
PACKAGE MECHANICAL DATA
SO8
DIMENSIONS
REF.
Millimetres
Inches
Min. Typ. Max. Min. Typ. Max.
A
a1
0.1
a2
b
b1
0.35
0.19
C
c1
D
E
Weight : 0.077g
M
S
0.069
0.010
1.65
0.065
0.48 0.014
0.25 0.007
0.019
0.010
0.50
0.020
4.8
45°(typ)
5.0 0.189
0.197
5.8
6.2
0.244
e
e3
F
L
1.75
0.25 0.004
0.228
1.27
3.81
3.8
0.4
0.050
0.150
4.0 0.15
1.27 0.016
0.157
0.050
0.6
8° (max)
0.024
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
 1998 SGS-THOMSON Microelectronics - Printed in Italy - All rights reserved.
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