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 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 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 www.semtech.com 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 www.semtech.com 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) 2004 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 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. 2004 Semtech Corp. 4 www.semtech.com 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. 2004 Semtech Corp. 5 www.semtech.com 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 for Semtech International AG Taiw an Branch Korea Branch Tel: 886-2-2748-3380 Fax: 886-2-2748-3390 Semtech Sw itz erland GmbH Japan Branch Tel: 81-3-6408-0950 Fax: 81-3-6408-0951 Tel: 82-2-527-4377 Fax: 82-2-527-4376 Semtech Limited (U.K.) Tel: 44-1794-527-600 Fax: 44-1794-527-601 Tel: 86-21-6391-0830 Fax: 86-21-6391-0831 Semtech France SARL Tel: 33-(0)169-28-22-00 Fax: 33-(0)169-28-12-98 Semtech International AG is a wholly-owned subsidiary of Semtech Corporation, which has its headquarters in the U.S.A. Semtech Germany GmbH Tel: 49-(0)8161-140-123 Fax: 49-(0)8161-140-124 2004 Semtech Corp. 6 Shanghai Office www.semtech.com