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Single Line TVS Diode for ESD Protection in Portable Electronics
PROTECTION PRODUCTS Description
The SDxxC TVS diodes are designed to replace multilayer varistors (MLVs) in portable applications such as cell phones, notebook computers, and PDA's. They offer superior electrical characteristics such as lower clamping voltage and no device degradation when compared to MLVs. The SDxxC series TVS diodes are designed to protect sensitive semiconductor components from damage or upset due to electrostatic discharge (ESD) and other voltage induced transient events. The SDxxC is in a SOD-323 package and will protect one bidirectional line. They are available with working voltages of 5 - 24 volts. These devices will fit on the same PCB pad area as an 0805 MLV device. They give the designer the flexibility to protect one line in applications where arrays are not practical. Additionally, it may be "sprinkled" around the board in applications where board space is at a premium. They may may be used to meet the ESD immunity requirements of IEC 61000-4-2, Level 4 (15kV air, 8kV contact discharge).
SD05C through SD24C
PRELIMINARY Features
350 Watts peak pulse power (tp = 8/20s) Transient protection for 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) 24A (8/20s) Small package for use in portable electronics Suitable replacement for MLV's in ESD protection applications Protects one I/O or power line Low clamping voltage Working voltages: 5V, 12V, 15V, 24V Low leakage current Solid-state silicon avalanche technology
Mechanical Characteristics
EIAJ SOD-323 package Molding compound flammability rating: UL 94V-0 Marking : Marking code Packaging : Tape and Reel per EIA 481
Applications
Cell Phone Handsets and Accessories Microprocessor based equipment Personal Digital Assistants (PDA's) Notebooks, Desktops, and Servers Portable Instrumentation Pagers Peripherals
Schematic & PIN Configuration
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SOD-323 (Top View)
Revision 07/06/04
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SD05C through SD24C
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Power (tp = 8/20s) ESD Voltage (HBM Waveform 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 350 30 260 (10 sec.) -55 to +125 -55 to +150 Units Watts kV C C C
Electrical Characteristics
SD05C T VS 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 = 5A, tp = 8/20s IPP = 24A, tp = 8/20s tp = 8/20s VR = 0V, f = 1MHz 6 10 9.8 14.5 24 200 Conditions Minimum Typical Maximum 5 Units V V A V V A pF
SD12C T VS 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 = 12V, T=25C IPP = 5A, tp = 8/20s IPP = 15A, tp = 8/20s tp = 8/20s VR = 0V, f = 1MHz 13.3 1 19 24 15 100 Conditions Minimum Typical Maximum 12 Units V V A V V A pF
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SD05C through SD24C
PROTECTION PRODUCTS Electrical Characteristics (Continued)
SD15C T VS Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Peak Pulse Current Junction Cap acitance
SD24C T VS 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 = 5A, tp = 8/20s IPP = 8A, tp = 8/20s tp = 8/20s VR = 0V, f = 1MHz 26.7 1 40 44 8 50 Conditions Minimum Typical Maximum 24 Units V V A V V A pF
PRELIMINARY
Symbol VRWM V BR IR VC VC IP P Cj
Conditions
Minimum
Typical
Maximum 15
Units V V
It = 1mA VRWM = 15V, T=25C IPP = 5A, tp = 8/20s IPP = 12A, tp = 8/20s tp = 8/20s VR = 0V, f = 1MHz
16.7 1 24 29 12 75
A V V A pF
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SD05C through SD24C
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
110
Power Derating Curve
Peak Pulse Power - Ppk (kW)
100
1
% of Rated Power or PP I
90 80 70 60 50 40 30 20 10
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC)
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
Waveform Parameters: tr = 8s td = 20s
30 25 20 15 10 5 0 0 5 10 15 20 25 30 Peak Pulse Current - IPP (A) SD05C Waveform Parameters: tr = 8s td = 20s SD12C
Clamping Voltage - VC (V)
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SD05C through SD24C
PROTECTION PRODUCTS Applications Information
Device Connection Options The SDxxC TVS diodes are designed to protect one data, I/O, or power supply line. The device is designed to replace multi-layer varistors (MLVs) in portable applications. It is easily implemented on existing 0805 MLV pads and is only slightly larger than 0603 MLV pads. The device is bidirectional and may be used on lines where the signal polarity is above and below ground. The device is symmetrical, so there is no cathode band. 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 (Refer to application note SI99-01 for more detailed information): Place the TVS near the input terminals or connectors to restrict transient coupling. Minimize the path length between the TVS and the protected line. The ESD transient return path to ground should be kept as short as possible. Place a TVS and decoupling capacitor between power and ground of components that may be vulnerable to electrostatic discharges to the ground plane. Minimize all conductive loops including power and ground loops. Use multilayer boards when possible. Minimize interconnecting line lengths Never run critical signals near board edges. Fill unused portions of the PCB with ground plane. 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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PRELIMINARY
Device Schematic and Pin Configuration
Size Comparison to 0805 MLV
SOD-323 Note: Nominal dimensions in inches
0805 MLV
Component Placement Comparison
0805 MLV on 0805 Solder Pad
SOD-323 on 0805 MLV Pad
SOD-323 on Recommended (SOD-323) Solder Pad
SD05C through SD24C
PROTECTION PRODUCTS Outline Drawing - SOD-323
Land Pattern - SOD-323
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SD05C through SD24C
PROTECTION PRODUCTS Marking Codes
Part Number SD05C SD12C SD15C SD24C Marking Code
5
PRELIMINARY
5/ 6/ 7/
Ordering Information
Par t Number SD05C.TC SD12C.TC SD15C.TC SD24C.TC SD05C.TCT SD12C.TCT SD15C.TCT SD24C.TCT Lead Finish SnPb SnPb SnPb SnPb Pb free Pb free Pb free Pb free Qty per Reel 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 R eel Size 7" 7" 7" 7" 7" 7" 7" 7"
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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