LESHAN RADIO COMPANY, LTD.
Dual transil array for ESD protection
General Description
The LESDAxxxLT1G is a dual monolithic voltage
suppressor designed to protect components which
are connected to data and transmission lines against
ESD. It clamps the voltage just above the logic level
supply for positive transients, and to a diode drop
below ground for negative transients. It can also
work as bidirectionnal suppressor by connecting
only pin1 and 2.
LESDAXXXLT1G
3
1
2
SOT– 23
Applications
Computers
Printers
Communication systems
It is particulary recommended for the RS232 I/O
port protection where the line interface withstands
only with 2kV ESD surges.
Features
2 Unidirectional Transil functions
Low leakage current: I
R
max< 20
μA
at VBR
3 00W peak pulse power(8/20μs)
High ESD protection level: up to 25 kV
Benefits
High ESD protection level
up to 25 kV. High integration.
Suitable for high density boards.
Complies with the following standards
IEC61000-4-2
Level 4
MIL STD 883c - Method 3015-6 Class 3
(Human Body Model)
Absolute Ratings (T
amb
=25
°C )
Symbol
Parameter
Value
Units
P
PP
T
L
T
stg
T
op
T
j
Peak Pulse Power (t
p
= 8/20μs)
Maximum lead temperature for soldering during 10s
Storage Temperature Range
Operating Temperature Range
Maximum junction temperature
Electrostatic discharge
MIL STD 883C -Method 3015-6
IEC61000-4-2 air discharge
IEC61000-4-2 contact discharge
300
260
-55 to +15
-40 to +125
150
25
16
9
W
°C
°C
°C
°C
V
PP
kv
1/5
LESHAN RADIO COMPANY, LTD.
LESDAXXXLT1G
Electrical Parameter
Symbol
V
RM
V
BR
V
CL
I
RM
I
PP
αT
V
F
C
R
d
Parameter
Stand-off voltage
Breakdown
voltage
Clamping
voltage
Leakage
current
Peak
pulse current
Voltage
temperature coefficient
Forward voltage drop
Capacitance
Dynamic
resistance
Electrical Characteristics
Part Numbers
Min.
v
LESDA5V3LT1G
LESDA6V1LT1G
LESDA14V2LT1G
LESDA25LT1G
V
BR
Max.
v
5.9
7.2
15.8
30
I
R
mA
1
1
1
1
V
RM
v
3
5.25
12
24
I
RM
µA
2
20
5
1
V
F
Max.
v
1.25
1.25
1.25
1.2
I
F
mA
200
200
200
10
R
d
Typ.
(1)
mΩ
280
350
650
1000
αT
Max.
(2)
10
-4
/°C
5
6
10
10
C
Typ. 0v bias
pF
220
140
90
50
5.3
6.1
14.2
25
1.Square
pulse I
PP
=15A,t
p
=2.5µs
2.△V
BR
=aT*(T
amb
-25°C)*V
BR
(25°C)
Typical Characteristics
Fig1.Peak power dissipation versus
Initial junction temperature
Fig2. Peak pulse power versus exponential
pulse duration(T
j
initial=25°C)
2/5
LESHAN RADIO COMPANY, LTD.
LESDAXXXLT1G
Fig3. Clamping voltage versus peak
pulse current(T
j
initial=25°C,
rectangular Waveform,t
p
=2.5
μ
s)
Fig4. Capacitance versus reverse
Applied voltage
Fig5.Relative variation of leakage current
Versus junction temperature
Application Note
Fig6. Peak forward voltage drop versus
peak forward current
Electrostatic discharge (ESD) is a major cause of failure in electronic systems. Transient Voltage
Suppressors (TVS) are an ideal choice for ESD protection. They are capable of clamping the incoming transient
to a low enough level such that damage to the protected
semiconductor is prevented.
Surface mount TVS arrays offer the best choice for minimal lead inductance. They serve as parallel
protection elements, connected between the signal line to ground. As the transient rises above the operating
voltage of the device, the TVS array becomes a low impedance path diverting the transient current to ground.
The ESDAxxL array is the ideal board evel protection of ESD sensitive semiconductor components.
The tiny SOT23 package allows design flexibility in the design of high density boards where the space
saving is at a premium. This enables to shorten the routing and contributes to hardening againt ESD.
3/5
LESHAN RADIO COMPANY, LTD.
LESDAXXXLT1G
4/5
LESHAN RADIO COMPANY, LTD.
LESDAXXXLT1G
SOT-23
NOTES:
A
L
3
1
V
G
2
B S
DIM
A
B
C
D
G
H
J
K
D
H
K
J
L
S
V
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M,1982
2. CONTROLLING DIMENSION: INCH.
INCHES
MIN
MAX
0.1102
0.1197
0.0472
0.0551
0.0350
0.0440
0.0150
0.0200
0.0701
0.0807
0.0005
0.0040
0.0034
0.0140
0.0350
0.0830
0.0177
0.0070
0.0285
0.0401
0.1039
0.0236
MILLIMETERS
MIN
MAX
2.80
3.04
1.20
1.40
0.89
1.11
0.37
0.50
1.78
2.04
0.013
0.100
0.085
0.35
0.89
2.10
0.45
0.177
0.69
1.02
2.64
0.60
C
0.037
0.95
0.037
0.95
0.079
2.0
0.035
0.9
0.031
0.8
inches
mm
5/5
