SDC36B TVS Diode Array for Proximity Switch Input Protection PROTECTION PRODUCTS Description Features The SDC36B is a high-surge transient voltage suppressor (TVS) optimized for protection of sensitive digital sensors used in proximity switches and industrial control applications. The SDC36B 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 The unique design of the SDC36B 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 <47V. 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 The SDC36B replaces up to two large discrete diodes providing the designer an easy to implement integrated solution. The features of the SDC36B are ideal for protection of two, three, and four wire DC high-side proximity switches. JEDEC SOT23 package RoHS/WEEE Compliant Molding compound flammability rating: UL 94V-0 Marking : D36B 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 02/01/07 1 www.semtech.com SDC36B 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 225 Watts Peak Pulse Current (tp = 1.2/50μs) IP P 4 A IFSMAX 4 A TJ -55 to +125 °C TSTG -55 to +150 °C N on-Repetitive Peak Forward Current (tp=100μs) Operating Temperature Storage Temperature Electrical Characteristics (T=25oC) SDC36B 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 Clamp ing Voltage VC IPP = 2A, tp = 1.2/50μs 47 V Junction Cap acitance Cj VR = 0V, f = 1MHz 50 pF © 2007 Semtech Corp. 2 Minimum Typical Maximum Units 33 V 35 V www.semtech.com SDC36B 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 50 100 125 150 o Pulse Duration - tp (µs) Pulse Waveform Clamping Voltage vs. Peak Pulse Current 60.00 110 Waveform Parameters: tr = 8µs td = 20µs 90 80 70 58.00 Clamping Voltage (V) 100 Percent of IPP 75 Ambient Temperature - TA ( C) -t e 60 50 40 td = IPP/2 30 20 10 56.00 54.00 52.00 50.00 48.00 46.00 Waveform Parameters: tr = 1.2μs td = 50μs 44.00 42.00 0 0 5 10 15 20 25 40.00 30 0 Time (µs) 1 2 3 4 5 Peak Pulse Current (A) 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) © 2007 Semtech Corp. 3 www.semtech.com SDC36B 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 SDC36B provides transient voltage protection for the digital sensors to ensure their operation is not disrupted by the physical world. SDC36B The SDC36B 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 SDC36B 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. SDC36B 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 . Matte Tin Lead Finish 4-Wire DC Proximity Switch Application Matte tin has become the industry standard lead-free replacement for SnPb lead finishes. A matte tin finish is composed of 100% tin solder with large grains. Since the solder volume on the leads is small compared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be determined by the requirements of the solder paste. Therefore, these devices are compatible with both lead-free and SnPb assembly techniques. In addition, unlike other lead-free compositions, matte tin does not have any added alloys that can cause degradation of the solder joint. © 2007 Semtech Corp. SDC36B 4 SDC36B www.semtech.com SDC36B 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. © 2007 Semtech Corp. 5 www.semtech.com SDC36B PROTECTION PRODUCTS Marking Code Ordering Information D36B Part Number Lead Finish Qty per Reel R eel Size SDC36B.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 © 2007 Semtech Corp. 6 www.semtech.com