SZSL05T1G

SL05T1G Series
www.onsemi.com
4
Applications Background
This family of surge protection devices (SL05T1 series)
are designed to protect sensitive electronics such as
communications systems, computers, and computer
peripherals against damage due to ESD conditions or
transient voltage conditions. Because of their low
capacitance value (less than 5 pF), they can be used in high
speed I/O data lines. Low capacitance is achieved by
integrating a compensating diode in series with the surge
protection which is basically based in the below theoretical
principle:
Capacitance in parallel: CT = C1+C2+....+Cn
Capacitance in series: 1/CT = (1/C1)+(1/C2)+....+(1/Cn)
The Figure 5 shows the integrated solution of the SL05T1
series device:
Figure 5.
COMPENSATING
DIODE
Surge
protection
In the case that an overvoltage condition occurs in the I/O
line protected by the SL05T1 series device, the surge
protection is reversedbiased while the compensation diode
is forwardbiased so the resulting current due to the
transient voltage is drained to ground.
If protection in both polarities is required, an additional
device is connected in inverseparallel with reference to the
first one, the Figure 6 illustrates the inverseparallel
connection for bidirectional or unidirectional lines:
Figure 6.
3
2
1
3
2
1
An alternative solution to protect unidirectional lines, is to
connect a fast switching steering diode in parallel with the
SL05T1 series device. When the steering diode is
forwardbiased, the surge protection will avalanche and
conduct in reverse direction. It is important to note that by
adding a steering diode, the effective capacitance in the
circuit will be increased, therefore the impact of adding a
steering diode must be taken in consideration to establish
whether the incremental capacitance will affect the circuit
functionality or not. The Figure 7 shows the connection
between the steering diode and the SL05T1 series device:
Figure 7.
STEERING DIODE
SL05T1 DEVICE
Another typical application in which the SL05T1 series
device can be utilized, is to protect multiple I/O lines. The
protection in each of the I/O lines is achieved by connecting
two devices in inverseparallel. The Figure 8 illustrates how
multiple I/O line protection is achieved:
Figure 8.
OUTPUTINPUT
For optimizing the protection, it is recommended to use ground planes and short path lengths to minimize the PCB’s ground inductance.
SL05T1G Series
www.onsemi.com
5
PACKAGE DIMENSIONS
SOT23 (TO236)
CASE 31808
ISSUE AR
D
A1
3
1
2
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH.
MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF
THE BASE MATERIAL.
4. DIMENSIONS D AND E DO NOT INCLUDE MOLD FLASH,
PROTRUSIONS, OR GATE BURRS.
SOLDERING FOOTPRINT*
VIEW C
L
0.25
L1
e
E
E
b
A
SEE VIEW C
DIM
A
MIN NOM MAX MIN
MILLIMETERS
0.89 1.00 1.11 0.035
INCHES
A1 0.01 0.06 0.10 0.000
b 0.37 0.44 0.50 0.015
c 0.08 0.14 0.20 0.003
D 2.80 2.90 3.04 0.110
E 1.20 1.30 1.40 0.047
e 1.78 1.90 2.04 0.070
L 0.30 0.43 0.55 0.012
0.039 0.044
0.002 0.004
0.017 0.020
0.006 0.008
0.114 0.120
0.051 0.055
0.075 0.080
0.017 0.022
NOM MAX
L1
H
2.10 2.40 2.64 0.083 0.094 0.104
H
E
0.35 0.54 0.69 0.014 0.021 0.027
c
0 −−− 10 0 −−− 10
T
°°°°
T
3X
TOP VIEW
SIDE VIEW
END VIEW
2.90
0.80
DIMENSIONS: MILLIMETERS
0.90
PITCH
3X
3X
0.95
RECOMMENDED
*For additional information on our PbFree strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
STYLE 26:
PIN 1. CATHODE
2. ANODE
3. NO CONNECTION
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SL05T1/D
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SZSL05T1G

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
TVS Diodes / ESD Suppressors SOT-23 3 DUAL
Lifecycle:
New from this manufacturer.
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