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TVS Diode Array For ESD and Latch-Up Protection
PROTECTION PRODUCTS Description
The SMS series of TVS arrays are designed to protect sensitive electronics from damage or latch-up due to ESD and other voltage-induced transient events. Each device will protect up to five lines. They are available with operating voltages of 5V, 12V, 15V and 24V. They are unidirectional devices and may be used on lines where the signal polarities are above ground. TVS diodes are solid-state devices designed specifically for transient suppression. They feature large crosssectional area junctions for conducting high transient currents. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage and no device degradation. The SMS series devices may be used to meet the immunity requirements of IEC 61000-4-2, level 4. The low cost SOT23-6L package makes them ideal for use in portable electronics such as cell phones, PDAs, and notebook computers.
SMS05C THRU SMS24C
Features
u 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 Protects five I/O lines Working voltages: 5V, 12V, 15V and 24V Low leakage current Low operating and clamping voltages Solid-state silicon avalanche technology
u u u u u u u u u u u u u u u u u u u
Mechanical Characteristics
EIAJ SOT23-6L 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 (PDAs) Notebooks, Desktops, and Servers Portable Instrumentation Set Top Box Peripherals MP3 Players Cordless Phones
Circuit Diagram
Schematic & PIN Configuration
SOT23-6L (Top View)
Revision 9/2000 1 www.semtech.com
SMS05C THRU SMS24C
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Pow er (tp = 8/20s) Peak Pulse Current (tp = 8/20s) Peak Forw ard Voltage (IF=1A, tp =8/20s) Lead Soldering Temp erature Op erating Temp erature Storage Temp erature Symbo l Pp k I PP V FP TL TJ TSTG Value 300 24 1.5 260 (10 sec.) -55 to +125 -55 to +150 Units Watts A V C C C
Electrical Characteristics
SMS05C Par ame te r Reverse Stand-Off Voltage Reverse Breakdow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR VC VC Cj It = 1mA VRWM = 5V, T=25C IPP = 5A, tp = 8/20s IPP = 24A, tp = 8/20s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 325 6 20 9.8 14.5 400 Co nd itio ns Minimum Typ ical Maximum 5 Units V V A V V pF
SMS12C Par ame te r Reverse Stand-Off Voltage Reverse Breakdow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR VC VC Cj It = 1mA VRWM = 12V, T=25C IPP = 5A, tp = 8/20s IPP = 15A, tp = 8/20s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 135 13.3 1 19 23 150 Co nd itio ns Minimum Typ ical Maximum 12 Units V V A V V pF
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SMS05C THRU SMS24C
PROTECTION PRODUCTS Electrical Characteristics (Continued)
SMS15C Par ame te r Reverse Stand-Off Voltage Reverse Breakdow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR VC VC Cj It = 1mA VRWM = 15V, T=25C IPP = 5A, tp = 8/20s IPP = 12A, tp = 8/20s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 100 16.7 1 24 29 125 Co nd itio ns Minimum Typ ical Maximum 15 Units V V A V V pF
SMS24C Par ame te r Reverse Stand-Off Voltage Reverse Breakdow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR VC VC Cj It = 1mA VRWM = 24V, T=25C IPP = 5A, tp = 8/20s IPP = 8A, tp = 8/20s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 60 26.7 1 40 44 75 Co nd itio ns Minimum Typ ical Maximum 24 Units V V A V V pF
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SMS05C THRU SMS24C
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10 Peak Pulse Power - PPP (kW)
Power Derating Curve
110 100 90 % of Rated Power or IPP 80 70 60 50 40 30 20 10
1
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
45
Clamping Voltage - V C (V)
Waveform Parameters: tr = 8s td = 20s
40 SMS24C 35 30 25 20 15 10 5 0 0 5 10 15 20 SMS05C SMS15C SMS12C
Waveform Parameters: tr = 8s td = 20s
25
30
Peak Pulse Current - IPP (A)
Forward Voltage vs. Forward Current
5 4.5 Forward Voltage - V F (V) 4 3.5 3 2.5 2 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 Forward Current - IF (A) Waveform Parameters: tr = 8s td = 20s
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SMS05C THRU SMS24C
PROTECTION PRODUCTS Applications Information
Device Connection for Protection of Five Data Lines The SMSxxC is designed to protect up to five unidirectional data lines. The device is connected as follows: 1. Unidirectional protection of five I/O lines is achieved by connecting pins 1, 3, 4, 5 and 6 to the data lines. Pin 2 is connected to ground. The ground connection 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. SMSxxC Circuit Diagram
Circuit Board Layout Recommendations for Suppression of ESD. Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended:
l l l l l l
Protection of Five Unidirectional Lines
Place the SMSxxC near the input terminals or connectors to restrict transient coupling. Minimize the path length between the SMSxxC 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.
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SMS05C THRU SMS24C
PROTECTION PRODUCTS Outline Drawing SO-8 Outline Drawing -- SOT23-6L
Land Pattern - SOT23-6L
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SMS05C THRU SMS24C
PROTECTION PRODUCTS Marking Codes
Par t Numbe r SMS05C SMS12C SMS15C SMS24C Mar king Co d e C05 C12 C15 C24
Note: Pin 1 Identified with a dot.
Ordering Information
Par t Numbe r SMS05C.TC SMS05C.TG SMS12C.TC SMS12CTG SMS15C.TC SMS15C.TG SMS24C.TC SMS24C.TG Wo r king Vo ltage 5V 5V 12V 12V 15V 15V 24V 24V Qty p e r Reel 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 R e e l Size 7 Inch 13 Inch 7 Inch 13 Inch 7 Inch 13 Inch 7 Inch 13 Inch
Note: (1) No suffix indicates tube pack.
Contact Information
Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804
a 2000 Semtech Corp. 7 www.semtech.com

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