®
ITA6V5B1 / ITA10B1
ITA18B1 / ITA25B1
BIDIRECTIONAL TRANSIL
TM
ARRAY
FOR DATALINE PROTECTION
Application Specific Discretes
A.S.D.
TM
APPLICATIONS
Differential data transmission lines protection :
- RS-232
- RS-423
- RS-422
- RS-485
FEATURES
s
SO-8
s
s
s
s
s
HIGH SURGE CAPABILITY TRANSIL ARRAY
I
PP
= 40 A (8/20µs)
PEAK PULSE POWER : 300 W (8/20µs)
UP TO 5 BIDIRECTIONAL TRANSIL FUNCTIONS
LOW CLAMPING FACTOR (V
CL
/ V
BR
) AT
HIGH CURRENT LEVEL
LOW LEAKAGE CURRENT
ESD PROTECTION UP TO 15kV
FUNCTIONAL DIAGRAM
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 allies high surge capability against
energetic pulses with high voltage performance
against ESD.
COMPLIES WITH THE FOLLOWING STANDARDS :
IEC 1000-4-2 : level 4
IEC 1000-4-4 : level 4
IEC 1000-4-5 : level 2
MIL STD 883C - Method 3015-6 : class 3
(human body model)
I/O1
I/O 2
I/O 3
I/O 4
1
2
3
4
8 GND
7
6
5 GND
August 2001- Ed: 2
1/5
ITA6V5B1 / ITA10B1 / ITA18B1 / ITA25B1
ABSOLUTE MAXIMUM RATINGS
(T
amb
= 25°C)
Symbol
P
PP
I
PP
I
2
t
T
stg
T
j
T
L
Parameter
Peak pulse power dissipation (8/20µs)
(see note 1)
Peak pulse current (8/20µs) (see note 1)
Wire I
2
t value (see note 1)
Storage temperature range
Maximum operating junction temperature
Maximum lead temperature for soldering during 10s
%I pp
100
8 s
Value
Tj initial = T
amb
Tj initial = T
amb
300
40
0.6
- 55 to + 150
125
260
Unit
W
A
A
2
s
°C
°C
°C
Note 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.
Pulse wave form 8/20 s
50
0
20 s
t
ELECTRICAL CHARACTERISTICS
(T
amb
= 25°C)
Symbol
V
RM
V
BR
V
CL
I
RM
I
PP
Parameter
Stand-off voltage
Breakdown voltage
Clamping voltage
Leakage current @ V
RM
Peak pulse current
Voltage temperature coefficient
Junction capacitance
α
T
C
Types
I
RM
max.
@
V
RM
V
BR
min.
note 2
@
I
R
V
CL
@
I
PP
8/20µs
V
CL
max.
note 2
@
I
PP
8/20µs
αT
max.
C
max.
note 3
note 2
mA
1
1
1
1
V
10
15
25
33
A
10
10
10
10
µA
V
5
8
15
24
V
6.5
10
18
25
V
12
19
28
38
A
25
25
25
25
10
-4
/°C
4
8
9
12
pF
750
570
350
300
ITA6V5B1
ITA10B1
ITA18B1
ITA25B1
10
4
4
4
Note 2
: Between I/O pin and ground.
Note 3
: Between two input Pins at 0V Bias, F = 1 MHz.
Preferred types in bold
2/5
ITA6V5B1 / ITA10B1 / ITA18B1 /ITA25B1
Fig. 1 :
Typical peak pulse power versus
exponential pulse duration.
1E+04
P
P P
(W)
T j initial = 25
o
C
ITA25B1
ITA18B1
Fig. 2 :
Clamping voltage versus peak pulse
current (exponential waveform 8/20
µs).
1E+03
ITA6V5B1
ITA10B1
1E+02
1E+01
1E-03
t P (ms) expo
1E-02
1E-01
1E+00
1E+01
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
I DC (A)
exponential waveform
Fig. 4 :
Junction capacitance versus reverse
applied voltage for one input/output (typical
values).
1E+02
1E+01
1E+00
1E-02
1E-01
1E+00
t (ms)
1E+01
Fig. 5 :
Relative variation of leakage current
versus junction temperature
3/5
ITA6V5B1 / ITA10B1 / ITA18B1 / ITA25B1
APPLICATION INFORMATION
Types
Maximum differential voltage
between two input pins at 25°C
+ / - 3.5 V
+ / - 5.0 V
+ / - 9.0 V
+ / - 12.5 V
ITA6V5B1
ITA10B1
ITA18B1
ITA25B1
This monolithic Transil Array is based on 6
unidirectional Transils with a common cathode and
can be configurated to offer up to 5 bidirectional
functions. This imposes a maximum differential
voltage between 2 input pins (see opposite table).
Typical application : RS232 junction.
TX
RX
RTS
CTS
GND
ORDER CODE
ITA
Integrated
Transil Array
V
BR
min
25
B
1
RL
Packaging:
RL = Tape & reel
= Tube
Package: SO-8 Plastic
Bidirectional
4/5
ITA6V5B1 / ITA10B1 / ITA18B1 /ITA25B1
MARKING
TYPE
ITA6V5B1
ITA10B1
ITA18B1
ITA25B1
MARKING
6V5B1
10B1
18B1
25B1
Packaging :
Preferred packaging is tape and reel.
Weight :
0.08g.
PACKAGE MECHANICAL DATA
SO-8 (Plastic)
DIMENSIONS
REF.
A
a1
a2
b
b1
C
c1
D
E
e
e3
F
L
M
S
3.8
0.4
4.8
5.8
1.27
3.81
4.0
0.6
8° (max)
0.15
1.27 0.016
0.35
0.19
0.50
45° (typ)
5.0
6.2
0.189
0.228
0.050
0.150
0.157
0.050
0.024
0.197
0.244
0.1
Millimetres
Min.
Typ. Max.
1.75
0.25 0.004
1.65
0.48 0.014
0.25 0.007
0.020
Min.
Inches
Typ. Max.
0.069
0.010
0.065
0.019
0.010
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all information previously supplied.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap-
proval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All rights reserved.
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5/5
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