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Low Capacitance TVS Diode For High Speed Data Interfaces
PROTECTION PRODUCTS Description
The SL series of TVS arrays are designed to protect sensitive electronics from damage or latch-up due to ESD, lightning, and other voltage-induced transient events. They are available with operating voltages of 5V, 12V, 15V and 24V. TVS diodes are solid-state devices designed specifically for transient suppression. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage, and no device degradation. The SL series devices feature a low capacitance, fast switching compensation diode in series with a standard TVS diode. This effectively reduces the overall capacitance of the device to less than 5pF making it an integrated, low capacitance solution for use on high-speed interfaces. The SL series devices may be used to meet the immunity requirements of IEC 61000-4-2, level 4.
SL05 through SL24
Features
Transient protection for high-speed data lines to IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (8/20s) Small package for use in portable electronics Two devices will protect one line Low capacitance for high-speed data lines Working voltages: 5V, 12V, 15V and 24V Solid-state silicon avalanche technology
Mechanical Characteristics
JEDEC SOT23 package Molding compound flammability rating: UL 94V-0 Marking : Marking Code Packaging : Tape and Reel per EIA 481
Applications
High-Speed data lines Cellular handsets AND accessories Universal Serial Bus (USB) port protection Portable instrumentation LAN/WAN equipment Peripherals
Circuit Diagram
Schematic & PIN Configuration
1
3 (N.C.)
2
SOT23 Top View
Revision 09/23/04 1 www.semtech.com
SL05 through SL24
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Power (tp = 8/20s) ESD Voltage (HBM p er IEC 61000-4-2) Lead Soldering Temp erature Op erating Temp erature Storage Temp erature Symbol Pp k VESD TL TJ TSTG Value 300 >25 260 (10 sec.) -55 to +125 -55 to +150 Units Watts kV C C C
Electrical Characteristics
SL05 Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Peak Pulse Current Junction Cap acitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 5V, T=25C IPP = 1A, tp = 8/20s IPP = 5A, tp = 8/20s tp = 8/20s Pi n 1 to 2 VR = 0V, f = 1MHz 6 20 9.8 11 17 5 Conditions Minimum Typical Maximum 5 Units V V A V V A pF
SL12 Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamping Voltage Clamping Voltage Peak Pulse Current Junction Capacitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 12V, T=25C IPP = 1A, tp = 8/20s IPP = 5A, tp = 8/20s tp = 8/20s Pi n 1 to 2 VR = 0V, f = 1MHz
2
Conditions
Minimum
Typical
Maximum 12
Units V V
13.3 1 19 24 12 5
A V V A pF
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SL05 through SL24
PROTECTION PRODUCTS Electrical Characteristics (Continued)
SL15 Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamping Voltage Clamping Voltage Peak Pulse Current Junction Capacitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 15V, T=25C IPP = 1A, tp = 8/20s IPP = 5A, tp = 8/20s tp = 8/20s Pi n 1 to 2 VR = 0V, f = 1MHz 16.7 1 24 30 10 5 Conditions Minimum Typical Maximum 15 Units V V A V V A pF
SL24 Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Peak Pulse Current Junction Cap acitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 24V, T=25C IPP = 1A, tp = 8/20s IPP = 5A, tp = 8/20s tp = 8/20s Pi n 1 to 2 VR = 0V, f = 1MHz 26.7 1 43 55 5 5 Conditions Minimum Typical Maximum 24 Units V V A V V A pF
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SL05 through SL24
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 0 25 50 75 100
o
Power Derating Curve
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
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
Waveform Parameters: tr = 8s td = 20s
ESD Pulse Waveform (Per IEC 61000-4-2)
Level
IEC 61000-4-2 Discharge Parameters
First Peak Current (A ) 1 2 3 4 7.5 15 22.5 30 Peak Current at 30 ns (A ) 4 8 12 16 Peak Current at 60 ns (A ) 8 4 6 8 Test Test Voltage Voltage (Contact (A ir Discharge) Discharge) (kV) (kV) 2 4 6 8 2 4 8 15
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SL05 through SL24
PROTECTION PRODUCTS Applications Information
Device Connection for Protection of One High-Speed Data Line The SL series devices are designed to protect highspeed data lines. The SLxx utilizes a low capacitance compensation diode in series with, but in opposite polarity to a TVS diode in each line to achieve an effective capacitance of less than 5pF per device. During a transient event, the internal rectifier must be forward biased (TVS is reversed biased). Therefore, each device will only suppress transient events in one polarity. To achieve protection in both positive and negative polarity, a second device is connected in antiparallel to the first. On unidirectional lines, a fast switching steering diode may be used as an alternative to using two SL devices. The options for connecting the devices are as follows: Low capacitance protection of one high-speed line: Protection of one unidirectional or bidirectional high-speed line is achieved by connecting two devices in anti-parallel. Pin 1 of the first device is connected to the line and pin 2 is connected to ground (or to a second line for differential protection). Pin 2 of the second device is connected to line 1 and pin 1 is connected to ground (or line 2) as shown. Pin 3 is not connected. During positive duration transients, the first device will conduct from pin 1 to 2. The steering diode conducts in the forward direction while the TVS will avalanche and conduct in the reverse direction. During negative transients, the second device will conduct in the same manner. For optimum protection, the ground connections should be made directly to the ground plane for best results. The path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. The path length between the TVS and the protected line should also be minimized. Connection Option for Unidirectional Lines Only: An optional method for protecting unidirectional (normal signal polarities above ground) lines is to add a fast switching steering diode in parallel to the SL TVS. Input/outputs are connected to pin 1 of the SL device and the cathode of the rectifier. The anode of the diode and pin 2 of the SL TVS are connected to ground. SL Connection Options
Two Devices : Bidirectional or Unidirectional Line
One Devices with Steering Diode : Unidirectional Line I/O Line Protection
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.
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SL05 through SL24
PROTECTION PRODUCTS Outline Drawing - SOT23 3L
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 3L
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.
2004 Semtech Corp.
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SL05 through SL24
PROTECTION PRODUCTS Marking Codes
Part Number SL05 SL12 SL15 SL24 Marking Code L05 L12 L15 L24
Ordering Information
Part Number SL05.TC SL12.TC SL15.TC SL24.TC SL05.TCT SL12.TCT SL15.TCT SL24.TCT Lead Finish SnPb SnPb SnPb SnPb Pb Free Pb Free Pb Free Pb Free Qty per R eel 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 R eel Size 7 Inch 7 Inch 7 Inch 7 Inch 7 Inch 7 Inch 7 Inch 7 Inch
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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2004 Semtech Corp.
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