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| TVS Diode Array for Proximity Switch Input Protection PROTECTION PRODUCTS Description 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. 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. 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. SDC36B Features 350 watts peak pulse power (tp = 8/20s) Transient protection for data and 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 Mechanical Characteristics 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 Peak Pulse Power (tp = 8/20s) Peak Pulse Power (tp = 1.2/50s) Peak Pulse Current (tp = 1.2/50s) N on-Repetitive Peak Forward Current (tp=100s) Operating Temperature Storage Temperature Symbol Pp k Pp k IP P IFSMAX TJ TSTG Value 350 225 4 4 -55 to +125 -55 to +150 Units Watts Watts A A C C Electrical Characteristics (T=25oC) SDC36B Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Reverse Leakage Current Forward Voltage Clamp ing Voltage Junction Cap acitance Symbol VRWM V BR IR IR(HOT) VF VC Cj Conditions Pin 3 to 1 or Pin 2 to 1 It = 1mA VRWM = 33V, T=25C VRWM = 33V, T=85C IF= 100mA IPP = 2A, tp = 1.2/50s VR = 0V, f = 1MHz 35 5 25 1.3 47 50 Minimum Typical Maximum 33 Units V V A A V V pF (c) 2007 Semtech Corp. 2 www.semtech.com SDC36B PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 Peak Pulse Power - Ppk (kW) 110 100 90 % of Rated Power or IPP 80 70 60 50 40 30 20 10 0 Power Derating Curve 1 0.1 0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000 0 25 50 75 100 o 125 150 Ambient Temperature - TA ( C) 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 60.00 Waveform Parameters: tr = 8s td = 20s 58.00 Clamping Voltage (V) 56.00 54.00 52.00 50.00 48.00 46.00 44.00 42.00 40.00 0 1 2 3 4 5 Waveform Parameters: tr = 1.2s td = 50s Peak Pulse Current (A) Forward Voltage vs. Forward Current 3 2.5 Forward Voltage - VF (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 (c) 2007 Semtech Corp. 3 www.semtech.com SDC36B 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 SDC36B provides transient voltage protection for the digital sensors to ensure their operation is not disrupted by the physical world. 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: 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 . Matte Tin Lead Finish 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. SDC36B 2-Wire DC Proximity Switch Application 3-Wire DC Proximity Switch Application SDC36B 4-Wire DC Proximity Switch Application SDC36B SDC36B (c) 2007 Semtech Corp. 4 www.semtech.com SDC36B PROTECTION PRODUCTS Outline Drawing - SOT23 D e1 3 A DIM H B A A1 A2 b c D E E1 e e1 L L1 N 0 aaa bbb DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .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 E1 E SEATING PLANE C GAUGE PLANE 0.25 L L1 DETAIL A 0 c 1 2 bxN e bbb CAB A A2 3X aaa C SEATING PLANE SIDE VIEW SEE DETAIL A A1 C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -BTO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - SOT23 X Y DIM Z G 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 Y 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. (c) 2007 Semtech Corp. 5 www.semtech.com SDC36B PROTECTION PRODUCTS Marking Code Ordering Information Part Number Lead Finish Pb Free Qty per Reel 3,000 R eel Size 7 Inch D36B SDC36B.TCT Contact Information Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 www.semtech.com (c) 2007 Semtech Corp. 6 |
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