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. u 350 watts peak pulse power (tp = 8/20µs) u Transient protection for data & power lines to u u u u u 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 u u u u 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 u Two, Three, and Four Wire DC High-Side Proximity Switches u Digital Sensor Input Protection u Industrial Controls u 24V - 33V DC Supply Protection Circuit Diagram Schematic & PIN Configuration SOT23 (Top View) Revision 9/2000 1 www.semtech.com SDC36 PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbo l Value Units Peak Pulse Pow er (tp = 8/20µ s) Pp k 350 Watts Peak Pulse Pow er (tp = 1.2/50µ s) Pp k 200 Watts Peak Pulse Current (tp = 1.2/50µ s) I PP 4 A IFSMAX 4 A Lead Sold ering 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 Forw ard Current (tp =100us) Storage Temp erature Electrical Characteristics SDC36 Par ame te r Symbo l Co nd itio ns Reverse Stand -Off Voltage VRWM Pin 3 to 1 or Pin 2 to 1 Reverse Breakd ow n Voltage V BR It = 1mA , Reverse Leakage Current IR V RWM = 33V, T=25°C 5 µA Reverse Leakage Current IR(HOT) V RWM = 33V, T=85°C 25 µA Forw ard Voltage VF IF= 100mA , 1.3 V Clamp ing Voltage VC IPP = 2A , tp = 1.2/50µ s 45 V Junction Cap acitance Cj V R = 0V, f = 1MHz 45 pF ã 2000 Semtech Corp. 2 Minimum Typ ical Maximum Units 33 V 36 V www.semtech.com SDC36 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 10 110 Peak Pulse Power - PPP (kW) 100 % of Rated Power or I PP 90 1 0.1 80 70 60 50 40 30 20 10 0 0.01 0 0.1 1 10 100 25 50 1000 Pulse Duration - tp (µ s) Pulse Waveform 100 125 150 Clamping Voltage vs. Peak Pulse Current 110 60 Waveform Parameters: tr = 8µs td = 20µs 90 80 70 e 60 -t 50 40 Bidirectional (Pin 1 to 2) 55 Clamping Voltage - V C (V) 100 Percent of IPP 75 Ambient Temperature - TA (oC) td = IPP/2 30 20 50 Unidirectional (pin 3 to 1 & 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 - V F (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) ã 2000 Semtech Corp. 3 www.semtech.com 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 & 2 are connected to the I/O lines & ground as shown. ã 2000 Semtech Corp. 4-Wire DC Proximity Switch Application 4 www.semtech.com 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. ã 2000 Semtech Corp. 5 www.semtech.com SDC36 PROTECTION PRODUCTS Ordering Information Par t Numbe r Wo r king Vo ltage Qty p e r R e e l R e e l Size SDC36.TC 33V 3,000 7 Inch SDC36.TG 33V 10,000 13 Inch Contact Information Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 ã 2000 Semtech Corp. 6 www.semtech.com