SDC15 TVS Diode Array for ESD Protection of 12V Data and Power Lines PROTECTION PRODUCTS Description Features The SDC15 transient voltage suppressor (TVS) is designed to protect components which are connected to data and transmission lines from voltage surges caused by electrostatic discharge (ESD) (ESD), electrical fast (EFT) lightning transients , and lightning. 300 watts peak pulse power (tp = 8/20µs) 40 watts peak pulse power (tp = 10/1000µs) Transient protection for data and power lines to TVS diodes are characterized by their high surge capability, low operating and clamping voltages, and fast response time. This makes them ideal for use as board level protection of sensitive semiconductor components. The dual-junction common-cathode design allows the user to protect one data or power line operating at ±12 volts. The low profile SOT23 package allows flexibility in the design of “crowded” circuit boards. IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (1.2/50µs) Protects one bidirectional line Low clamping voltage Low leakage current High surge capability Solid-state silicon avalanche technology Mechanical Characteristics The SDC15 TVS will meet the surge requirements of IEC 61000-4-2 (Formerly IEC 801-2), Level 4, “Human Body Model” for air and contact discharge. JEDEC SOT23 package Molding compound flammability rating: UL 94V-0 Marking : DC15 Packaging : Tape and Reel per EIA 481 Applications Circuit Diagram RS-232 Data Lines Portable Electronics Industrial Controls Set-Top Box Servers, Notebook, and Desktop PC 12V DC Supply Protection Schematic & PIN Configuration SOT23 (Top View) Revision 12/15/04 1 www.semtech.com SDC15 PROTECTION PRODUCTS Absolute Maximum Rating Rating Symbol Value Units Peak Pulse Power (tp = 8/20µs) Ppk 300 Watts Peak Pulse Current (tp = 8/20µs) IPP 10 A IFSMAX 4 A Thermal Resistance, Junction to Ambient θJA 556 °C/W Lead Soldering Temperature TL 260 (10 sec.) °C Operating Temperature TJ -55 to +125 °C TSTG -55 to +150 °C Non-Repetitive Peak Forward Current (tp=100µs) Storage Temperature Electrical Characteristics S DC 1 5 Parameter Reverse Stand-Of f Voltage Symbol Conditions Minimum VRWM Maximum Units 12.8 V 16.4 V VBR It= 1mA, Between Pin 1 and 2 (each direction) Reverse Leakage Current IR VRWM = 12.8V, T=25°C Between Pin 1 and 2 (each direction) 100 nA Forward Voltage VF IF= 100mA, Pin 1 to 3 and Pin 2 to 3 1.3 V 12 mV/°C Reverse Breakdown Voltage Temperature Coef ficient of VBR αVBR 14.3 Typical Clamping Voltage VC IPP = 1.9A, tp = 10/10000µs Between Pin 1 and 2 (each direction) 21.2 V Junction Capacitance Cj VR = 0V, f = 1MHz Pin 1 to 2 120 pF 2004 Semtech Corp. 2 www.semtech.com SDC15 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 Pulse Waveform 125 150 25 90 80 Clamping Voltage - VC (V) W aveform Parameters: tr = 8µs td = 20µs 100 Percent of IPP 100 Clamping Voltage vs. Peak Pulse Current 110 e -t 60 50 40 75 o Pulse Duration - tp (µs) 70 50 Ambient Temperature - TA ( C) td = I PP /2 30 20 15 Waveform Parameters: tr = 8µs td = 20µs 20 10 10 0 0 5 10 15 20 25 1 30 2 3 4 5 6 7 8 9 10 11 12 Peak Pulse Current - IPP (A) T im e (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 SDC15 PROTECTION PRODUCTS Applications Information Device Schematic and Pin Configuration Device Connection for Protection of One Data Line The SDC15 is designed to protect one data or I/O line operating at ±12 volts. Connection options are as follows: z z Common mode protection: Pin 1 is connected to the data line and pin 2 is connected to ground. For best results, this pin should be connected directly to a ground plane on the board. The path length should be kept as short as possible to minimize parasitic inductance. Pin 3 is not connected. Differential protection: Pin 1 is connected to one line and pin 2 is connected to the second line. Pin 3 is not connected. RS-232 Transceiver Protection Example Circuit Board Layout Recommendations for Suppression of ESD. Good circuit board layout is critical for the suppression of fast rise-time transients such as ESD. The following guidelines are recommended: z z z z z z Place the SDC15 near the input terminals or connectors to restrict transient coupling. Minimize the path length between the SDC15 and the protected line. Minimize all conductive loops including power and ground loops. The ESD transient return path to ground should be kept as short as possible. Never run critical signals near board edges. Use ground planes whenever possible. 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. 2004 Semtech Corp. 4 www.semtech.com SDC15 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. Note 1 : Grid placement courtyard is 8 x 8 elements (4mm x 4mm) in accordance with the international grid detailed in IEC Publication 97. 2004 Semtech Corp. 5 www.semtech.com SDC15 PROTECTION PRODUCTS Ordering Information Part Number Lead Finish Qty per Reel R eel Size SDC15.TC SnPb 3,000 7 Inch SDC15.TCT Pb Free 3,000 7 Inch Contact Information Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. 6 www.semtech.com