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TVS Diode Array for Proximity Switch Input Protection
PROTECTION PRODUCTS Description
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. 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. 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.
SDC36
Features
u 350 watts peak pulse power (tp = 8/20s) u Transient protection for data & power lines to
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 2A (1.2/50s) Replaces two discrete devices Low clamping voltage Low leakage current High surge capability Solid-state silicon avalanche technology
u u u u u
Mechanical Characteristics
u u u u
JEDEC SOT23 package Molding compound flammability rating: UL 94V-0 Marking : DC36 Packaging : Tape and Reel per EIA 481
Applications
u Two, Three, and Four Wire DC High-Side Proximity u Digital Sensor Input Protection u Industrial Controls u 24V - 33V DC Supply Protection
Switches
Circuit Diagram
Schematic & PIN Configuration
SOT23 (Top View)
Revision 9/2000 1 www.semtech.com
SDC36
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Pow er (tp = 8/20 s) Peak Pulse Pow er (tp = 1.2/50 s) Peak Pulse Current (tp = 1.2/50 s) N on-Rep etitive Peak Forw ard Current (tp =100us) Lead Sold ering Temp erature Op erating Temp erature Storage Temp erature Symbo l Pp k Pp k I PP IFSMAX TL TJ TSTG Value 350 200 4 4 260 (10 sec.) -55 to +125 -55 to +150 Units Watts Watts A A C C C
Electrical Characteristics
SDC36 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Reverse Leakage Current Forw ard Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR IR(HOT) VF VC Cj Co nd itio ns Pin 3 to 1 or Pin 2 to 1 It = 1mA , V RWM = 33V, T=25C V RWM = 33V, T=85C IF= 100mA , IPP = 2A , tp = 1.2/50 s V R = 0V, f = 1MHz 36 5 25 1.3 45 45 Minimum Typ ical Maximum 33 Units V V A A V V pF
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SDC36
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10 Peak Pulse Power - PPP (kW)
110 100 90 % of Rated Power or I PP
Power Derating Curve
1
80 70 60 50 40 30 20 10
0.1
0.01 0.1 1 10 Pulse Duration - tp ( s) 100 1000
0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC)
Pulse Waveform
110 100 90 80 Percent of IPP 70 60 50 40 30 20 10 0 0 5 10 15 Time (s) 20 25 30 td = IPP/2 e
-t
Clamping Voltage vs. Peak Pulse Current
60
Clamping Voltage - V C (V)
Waveform Parameters: tr = 8s td = 20s
55 50 45 40 35 30 25 1 1.5 2 2.5 3 3.5 4
Bidirectional (Pin 1 to 2)
Unidirectional (pin 3 to 1 & 3 to 2)
Waveform Parameters: tr = 8s td = 20s 4.5 5 5.5 6 6.5 7 7.5
Peak Pulse Current - IPP (A)
Forward Voltage vs. Forward Current
3 2.5 Forward Voltage - V F (V) 2 1.5 1 0.5 0 0 1 2 3 4 5 6 7 8 9 10 11 12 Forward Current - IF (A)
Waveform Parameters: tr = 8s td = 20s
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SDC36
PROTECTION PRODUCTS Applications Information
Device Connection for Protection of Two, Three, and Four Wire Proximity Switches 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: 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 & 2 are connected to the I/O lines & ground as shown.
2-Wire DC Proximity Switch Application
3-Wire DC Proximity Switch Application
4-Wire DC Proximity Switch Application
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SDC36
PROTECTION PRODUCTS Outline Drawing - SOT23
Land Pattern - SOT23
Note 1 : Grid placement courtyard is 8 x 8 elements (4mm x 4mm) in accordance with the international grid detailed in IEC Publication 97.
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SDC36
PROTECTION PRODUCTS Ordering Information
Par t Numbe r SDC36.TC SDC36.TG Wo r king Vo ltage 33V 33V Qty p e r R e e l 3,000 10,000 R e e l Size 7 Inch 13 Inch
Contact Information
Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804
a 2000 Semtech Corp. 6 www.semtech.com

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