SDC36

SDC36
TVS Diode Array for
Proximity Switch Input Protection
PROTECTION PRODUCTS
Description
Features
The SDC36 is a high-surge transient voltage suppressor (TVS) optimized for protection of sensitive digital
sensors used in proximity switches and industrial
control applications. The SDC36 protects the components from over-voltages caused by electrostatic
discharge (ESD), electrical fast transients (EFT), and
tertiary lightning.
‹ 350 watts peak pulse power (tp = 8/20µs)
‹ Transient protection for data and power lines to
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The unique design of the SDC36 incorporates two TVS
diodes in a compact SOT23 package for applications
where board space is at a premium. The single package provides protection for the I/O line and power
supply rail with high surge capabilities (2 Amps at
tp=1.2/50us) and an exceptionally low clamping voltage of <45V.
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 2A (1.2/50µs)
Replaces two discrete devices
Low clamping voltage
Low leakage current
High surge capability
Solid-state silicon avalanche technology
Mechanical Characteristics
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The SDC36 replaces up to two large discrete diodes
providing the designer an easy to implement integrated
solution. The features of the SDC36 are ideal for
protection of two, three, and four wire DC high-side
proximity switches.
JEDEC SOT23 package
Molding compound flammability rating: UL 94V-0
Marking : DC36
Packaging : Tape and Reel per EIA 481
Applications
‹ Two, Three, and Four Wire DC High-Side Proximity
Switches
‹ Digital Sensor Input Protection
‹ Industrial Controls
‹ 24V - 33V DC Supply Protection
Circuit Diagram
Schematic & PIN Configuration
SOT23 (Top View)
Revision 12/15/04
1
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SDC36
PROTECTION PRODUCTS
Absolute Maximum Rating
R ating
Symbol
Value
Units
Peak Pulse Power (tp = 8/20µs)
Pp k
350
Watts
Peak Pulse Power (tp = 1.2/50µs)
Pp k
200
Watts
Peak Pulse Current (tp = 1.2/50µs)
IP P
4
A
IFSMAX
4
A
Lead Soldering Temp erature
TL
260 (10 sec.)
°C
Op erating Temp erature
TJ
-55 to +125
°C
TSTG
-55 to +150
°C
N on-Rep etitive Peak Forward Current (tp=100µs)
Storage Temp erature
Electrical Characteristics
SDC36
Parameter
Symbol
Conditions
Reverse Stand-Off Voltage
VRWM
Pin 3 to 1 or Pin 2 to 1
Reverse Breakdown Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 33V, T=25°C
5
µA
Reverse Leakage Current
IR(HOT)
VRWM = 33V, T=85°C
25
µA
Forward Voltage
VF
IF= 100mA
1.3
V
Clamping Voltage
VC
IPP = 2A,
tp = 1.2/50µs
45
V
Junction Capacitance
Cj
VR = 0V, f = 1MHz
45
pF
 2004 Semtech Corp.
2
Minimum
Typical
Maximum
Units
33
V
36
V
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SDC36
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
Power Derating Curve
10
110
Peak Pulse Power - Ppk (kW)
100
% of Rated Power or IPP
90
1
0.1
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
100
0
1000
25
50
Pulse Waveform
60
Waveform
Parameters:
tr = 8µs
td = 20µs
90
80
-t
e
50
40
150
Bidirectional
(Pin 1 to 2)
55
Clamping Voltage - VC (V)
100
60
125
Clamping Voltage vs. Peak Pulse Current
110
70
100
o
Pulse Duration - tp (µs)
Percent of IPP
75
Ambient Temperature - TA ( C)
td = IPP/2
30
20
50
Unidirectional
(pin 3 to 1 and 3 to 2)
45
40
35
Waveform
Parameters:
tr = 8µs
td = 20µs
30
10
25
0
0
5
10
15
20
25
1
30
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
Peak Pulse Current - IPP (A)
Time (µs)
Forward Voltage vs. Forward Current
3
Forward Voltage - VF (V)
2.5
2
1.5
1
Waveform
Parameters:
tr = 8µs
td = 20µs
0.5
0
0
1
2
3
4
5
6
7
8
9
10
11
12
Forward Current - IF (A)
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SDC36
PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Two, Three, and
Four Wire Proximity Switches
2-Wire DC Proximity Switch Application
Digital sensors help to bridge the gap between the
physical world and the digital world in applications such
as computer controlled factory automation. In such
environments, transient voltages can easily disrupt or
damage sensitive sensor inputs. The SDC36 provides
transient voltage protection for the digital sensors to
ensure their operation is not disrupted by the physical
world.
The SDC36 is designed to meet the high surge capability and low clamping voltage needed to protect the
ASIC and control logic used in proximity switches. The
SDC36 provides protection for the power and I/O lines.
Typical configurations for the protection of two, three,
and four wire switches are as follows:
3-Wire DC Proximity Switch Application
1. Two-Wire Switch: Connect pin 1 to the I/O line and
pin 2 to the DC supply (since the device is symmetrical,
these connections can be reversed). Pin 3 is not
connected.
2. Three-Wire Switch: Either pin 1 or pin 2 is connected to the I/O line with the other connected to
ground. Pin 3 must be connected to the DC supply.
3. Four-Wire Switch: Two device are required to
protect four wire switches. Pin 3 of each device is
connected to the DC supply line. Pins 1 and 2 are
connected to the I/O lines and ground as shown.
 2004 Semtech Corp.
4-Wire DC Proximity Switch Application
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SDC36
PROTECTION PRODUCTS
Outline Drawing - SOT23
D
A
DIM
e1
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
N
0
aaa
bbb
H
3
B
E1
GAUGE
PLANE
SEATING
PLANE
E
0
c
0.25
C
L
L1
DETAIL A
1
2
bxN
bbb
e
A2
A
.035
.000
.035
.012
.003
.110
.082
.047
.015
0°
.037
.114
.093
.051
.075
.037
.020
.022
3
.004
.008
.044
.004
.040
.020
.007
.120
.104
.055
.024
8°
0.89
1.12
0.01
0.10
0.88 0.95 1.02
0.30
0.51
0.08
0.18
2.80 2.90 3.04
2.10 2.37 2.64
1.20 1.30 1.40
1.90 BSC
0.95 BSC
0.40 0.50 0.60
(0.55)
3
0°
8°
0.10
0.20
C A B
3X
aaa C
SEE DETAIL A
SIDE VIEW
SEATING PLANE
A1
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
C
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B-
TO BE DETERMINED AT DATUM PLANE -H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
Land Pattern - SOT23
X
Y
DIM
Z
G
Y
C
C
E
E1
G
X
Y
Z
DIMENSIONS
INCHES
MILLIMETERS
(.087)
.037
.075
.031
.039
.055
.141
(2.20)
0.95
1.90
0.80
1.00
1.40
3.60
E
E1
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A.
Note 1 : Grid placement courtyard is 8 x 8 elements (4mm x 4mm) in accordance with the international grid detailed in IEC
Publication 97.
 2004 Semtech Corp.
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SDC36
PROTECTION PRODUCTS
Ordering Information
Part Number
Lead
Finish
Qty per
Reel
R eel Size
SDC36.TC
SnPb
3,000
7 Inch
SDC36.TCT
Pb Free
3,000
7 Inch
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
 2004 Semtech Corp.
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