ESD SUPPRESSION PRODUCTS BROCHURE ESD Electrostatic Discharge Suppression Products ESD Suppressor Product Selection Guide ESD Suppression Technologies LITTELFUSE ESD SUPPRESSION TECHNOLOGY COMPARISON Protection Data Rate Technology Span Multilayer Varistor (MLVs) < 125Mbps Peak / Clamp (8kV) ESD Surge Level Discrete Options Array Options Applications and Circuits Key Advantages Good Good 0402 0603 0805 1206 1206 Keypad/switch, audio, analog video, USB1.1, RS232 Lowest cost; broad discrete offering Keypad/switch, USB1.1, USB2.0, audio, analog video, FireWire 1394, HDMI, Ethernet, MMC interface, LCD module. Lowest peak and clamp voltages USB2.0, FireWire 1394, HDMI, RF antenna Lowest capacitance SPA™ Silicon Protection Arrays 0 -> 5Gbps Excellent Excellent SOD723 SOT23 SC70 SOT553 SOT563 SOT953 MSOP 8 MSOP 10 µDFN PulseGuard® ESD Suppressors 100Mbps -> 5Gbps Good Good 0402 0603 SOT23 When to Choose PulseGuard® ESD Suppressors • The application tolerates very little added capacitance (high speed data lines or RF circuits) • ESD is the only transient threat • Protection is required on data, signal, and control lines (not power supply lines) When to Choose SPATM Silicon Protection Arrays • The device being protected requires the lowest possible clamp voltage, low capacitance (0.65pF – 30pF) and low leakage (0.02µA – 10µA) • Board space is at a premium and space-savings multi-line protection is needed • Transients other than ESD, such as EFT or lightning, must also be considered When to Choose Multilayer Varistors (MLVs) • Surge currents or energy beyond ESD is expected in the application (EFT, lightning) • Looking to replace high wattage TVS Zener diodes (300W – 1500W) • Added capacitance is desirable for EMI filtering (3pF – 6000pF) • Power supply line or low/medium speed data and signal lines are to be protected • The operating voltage is above silicon or PulseGuard® ESD suppressor ratings www.littelfuse.com/ESD ESD SUPPRESSION REQUIREMENTS ABOUT THIS GUIDE Electrostatic Discharge (ESD) is an electrical transient that poses a serious threat to electronic circuits. The most common cause is friction between two dissimilar materials, causing a buildup of electric charges on their surfaces. Typically, one of the surfaces is the human body, and it is not uncommon for this static charge to reach a potential as high as 15,000 volts. At 6,000 static volts, an ESD event will be painful to a person. Lower voltage discharges may go unnoticed, but can still cause catastrophic damage to electronic components and circuits. Choosing the most appropriate suppressor technology requires a balance between equipment protection needs and operating requirements, taking into account the anticipated threat level. In addition to the electrical characteristics of suppression devices, the form factor/ package style must also be considered. The likelihood of electronic circuit damage is increasing as integrated circuit (IC) dimensions are shrinking to nanometer sizes. Most ICs operate at low voltages and have structures and conductive paths that cannot survive the high currents and voltages associated with ESD transients. Another significant trend is the migration to higher frequency communication devices to transmit more information in less time. This means that ESD solutions must not compromise stringent signal integrity requirements at the higher data rates. Therefore, ESD suppressors must have low internal capacitance so that data communication signals are not distorted. IC designers add a limited amount of ESD suppression to their chips to help avoid damage during manufacturing and assembly processes. However, the level of protection that is added may not be sufficient to protect ICs and other semiconductor devices from ESD during actual usage. Many electronic products, especially portable ones, are used in uncontrolled environments. Portable devices can experience a charge buildup as they are carried by users on their person or in a purse. This energy can then be discharged to another device as the two are connected, usually when a user touches I/O pins on a cable connector. Therefore, end product designers should consider adding ESD suppressors to their circuits. This guide is designed to summarize some of the comprehensive ESD solutions that Littelfuse offers, and help designers narrow to technologies appropriate to their end application: • The table opposite this page summarizes general qualitative factors of each Littelfuse technology • Page 2 describes common ESD threats and circuit design considerations • Pages 3-5 present common end applications and the particular Littelfuse ESD suppression products designed for those applications • Pages 6-9 present additional and more detailed product selection and specification criteria Additional articles on ESD suppression and current data sheets about the products presented in this brochure can be found at www.littelfuse.com/ESD To discuss your design situation and requirements in detail, please contact your local Littelfuse products representative www.littelfuse.com/contact-us.html 1 ESD Suppressor Product Selection Guide ESD DAMAGE Soft Failures Electrical currents due to ESD can change the state of internal logic, causing a system to latch up or behave unpredictably, or cause corruption of a data stream. While this is temporary, it may slow down communications, or require a system reboot in the case of lockup. ESD test waveform 100 90 % Current (I) % ESD is characterized by fast rise times and high peak voltages and currents up to 30 amps (per IEC 61000-4-2, level 4), which can melt silicon and conductor traces. However, ESD effects can be more subtle. The three types of damage are: I30 I60 30ns 60ns Latent Defects A component or circuit may be damaged by ESD and its function degraded though the system will continue to work. However, this type of defect often progresses to a premature failure. Catastrophic Failure Of course, ESD can damage a component to the point where it does not function as intended, or doesn’t work at all. ESD SUPPRESSION AND CIRCUIT DESIGN CONSIDERATIONS Proper use of ESD circuit protection helps prevent these failures. Still, selection of a suppression device must recognize that ESD has very short rise and fall times—less than one nanosecond (1ns) in most cases. The International Electrotechnical Commission (IEC) has developed a specification (IEC 61000-4-2) for ESD testing that helps determine if products are susceptible to ESD events. Littelfuse device engineers use specifications like these to design ESD suppressors with the speed, clamping voltage, and residual current levels that will protect today’s sensitive semiconductors and electronic circuitry. Many of these designs have the low internal capacitance needed for high bandwidth communications. When selecting ESD suppressors, circuit designers need to consider potential coupling paths that would allow ESD to enter their equipment and circuits. These weak points identify areas that should be considered for ESD suppressor installation. Ultimately, designers need to select ESD suppressors with characteristics appropriate for their type of equipment, the component sensitivity, and the environment where it will be used. 2 tr = 0.7 to 1.0ns www.littelfuse.com/ESD DATA PROTOCOL, APPLICATION AND PRODUCT SELECTION The chart below shows the relationship between Data Rates (Protocol), Applications, and Littelfuse ESD suppression products. The top of the chart shows the standard data protocols, associated data rates, and example end applications that may use the protocols, while the body of the chart shows the applicable Littelfuse ESD suppressors for the various data rates, protocols and applications. The characteristic of concern here is capacitance. High capacitance suppression devices will tend to add signal distortion as signal frequencies increase; low capacitance devices will maintain signal integrity at high data rates. products. For example, a laptop computer could have RS232, USB 2.0, video, and PS2 mouse ports, as well as others. The RS232 and mouse ports use relatively slow data rates and could use any Littelfuse suppressor (although higher capacitance multi-layer or silicon parts are preferred for EMI filtering capabilities). The appropriate protector for the video port would depend on the data rate, and since the USB 2.0 port requires an extremely low capacitance suppression device, PulseGuard® ESD Suppressor or SPATM Silicon Protection Array devices should be considered. If you require further assistance in selecting the appropriate Littelfuse ESD suppressor for your specific circuit, please contact your local Littelfuse products representative. Note that an application may use several different data protocols and could use as many different ESD suppressor DATA RATE, PROTOCOL, AND ESD SUPPRESSOR CORRELATION Data Rate (Mbit/sec) 0 .03 Audio .05 .13 2 12 RS232 IEEE 1284 USB 1.1 Data Protocols 25 125 RS485 Ethernet Video 320 400 480 800 3,000 5,000 USB 2.0 IEEE1394b SATA HDMI/USB3.0 IEEE 1394a LCDs ML & MLN series (MLV) MLE series (MLV) SP05x series (SPATM) SP10xx, SP72x series (SPATM) MHS series (MLV) SP03-xx series (SPATM) PGB1, PGB2 (PulseGuard® ) SP300X Series Typical Applications Speaker Microphone Audio Headset DC Power Bus Keypad Buttons Parallel Port (LPT) Printer Scanner Serial Port (com) Keyboard Mouse Set - Top Box (com) VCR Video In/Out Coputer Input and Periperal Devices PDA / PMP / Cell Phone/ Digital Camera/ Game Controller Ports Control System TFT Display Network Hardware PCI Adapter Hub Router Webswitch Cable/xDSL modem Digital Still Camera PC Accessories Scanner and Peripherals with Serial Data Printer Hard Disk Drive Interfaces Digital Video Recorder Digital Video Recorder Hub Hard Disk Drive Hard Disk Drive R/W CDs Video Editing System Video Editing System Desktop Scanner Scanner Laptop Desktop Desktop Webpad Laptop Laptop Internet Appliance Set Top Box DVD PVR HDTV Monitor LCD TV LCD Projector The information above is intended to help circuit designers determine which Littelfuse ESD suppressors are applicable for given data protocols and data rates. Other key characteristics such as clamping voltage, leakage current, number of lines of protection and ESD capabilities need to be considered, especially where there are overlaps in the recommended Littelfuse ESD suppressor line (ex. IEEE 1284 and Ethernet). This information is detailed on the following pages. At the upper data rate bounds of the products included above, the capacitances of the suppression device and the circuit board need to be taken into account in order to maintain the signal integrity of the overall system. 3 ESD Suppressor Product Selection Guide COMMON ESD SUPPRESSION SOLUTIONS The following are examples of the implementation of ESD suppression. Contact Littelfuse for additional application assistance and design examples. indicates that the provided solution is lead-free. indicates that the solution meets the requirements of RoHS. Protection of USB 1.1 (full-speed) port Data speeds up to 12 Mbps D+/D-: V0402MHS03 multilayer varistor (3 pF) USB Port USB 1.1 Controller USB Port 1206L075 USB 1.1 Controller V5.5MLA0402 VBUS VBUS D+ D+ D- DOutside World Outside World 1206L075 V5.5MLA0603 D+/D-: SP1001-02 silicon protection array SP1001-02JTG (2) V0402MHS03 Signal Ground Shield Ground Shield Ground Signal Ground Protection of USB 2.0 (high-speed) port Data speeds up to 480 Mbps D+/D-: SP3003-02 silicon protection array USB Port D+/D-: PGB1010603 polymeric suppressor (0.05 pF) USB 2.0 Controller USB Port 1206L075 VBUS D+ D+ D- D- SP3003-02JTG Shield Ground V5.5MLA0603 VBUS Outside World Outside World 1206L075 4 USB 2.0 Controller Signal Ground (2) PGB1010603 Shield Ground Signal Ground www.littelfuse.com/ESD Protection of High Definition Multimedia Interface (HDMI) port Data speeds up to 1.25 Gbps HDMI: SP3003-04AT silicon protection array TX+/-, TC+/-: PGB1010603 (0.05 pF) HDMI Port HDMI Transmitter or Receiver (8) PGB1010603 B+ BShield Ground Vcc Outside World Outside World TX0+ TX0TX01+ TX01TX02+ TX02TC+ TC- LCD Module Controller Input CI+ CISP3003-04ATG (MSOP10) Signal Ground Signal Ground Shield Ground Protection of Audio port Left/Right channels less than 30,000 Hz L/R: V14MLA0402 multilayer varistor Audio Codec Headphone Port/ Speaker, Microphone VBUS Left Left Right Right (2) V14MLA0402 (2) SP1002-01JTG Signa Grou Shield Ground Audio Codec VBUS Outside World Outside World Headphone Port/ Speaker, Microphone L/R: SP1002-01JTG silicon protection array Signal Ground Shield Ground 5 ESD Suppressor Product Selection Guide Please refer to this table and the next few pages in selecting the ESD suppressors that may best serve the circuit requirements. Detailed data sheets can be downloaded from our web site www.littelfuse.com PulseGuard® ESD Suppressors Mounting Options Series Name Terms: EFT: Electrical Fast Transient TVS: Transient Voltage Suppressor PGB1, PGB2 Technology Type Voltage Variable Material Working Voltage 0–24VDC Array Package (No. of Lines) SOT23 (2) Single Line Package 0603, 0402 Typical Device Capacitance 0.04-0.12pF Leakage Current <1nA typ Rated Immunity to IEC 61000-4-2 level 4 Yes Also Rated for EFT or Lightning No Bidirectional (transients of either polarity) Yes Performs Low Pass Filtering 6 Surface Mount ––––– Lead-Free Yes RoHS Compliant Yes www.littelfuse.com/ESD PulseGuard® ESD Suppressors SPATM Silicon Protection Arrays Multilayer Varistors (MLVs) ML, MLE, MHS series MLN series SPA™ Silicon Protection Arrays Multilayer Varistors (MLVs) Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount & Thru-Hole Surface Mount Surface Mount Surface Mount Surface Mount SP72x SP03-xx SP05x SP10xx SP30xx ML MLE MHS MLN Silicon Controlled Rectifier / Diode Low Capacitance Diode Arrays Uni-directional TVS Arrays Uni- and Bidirectional TVS Arrays Low Capacitance Diode Arrays MLV ZnO MLV ZnO MLV ZnO MLV ZnO 0–30VDC 0–8VDC 0–5.5VDC 0–6VDC 0–6VDC 0–120VDC range by type 0–18VDC 0–42VDC 0–18VDC PDIP, SOIC (6, 14) SOT23 (4) SOIC (2) SOT23 (2, 4, 5), S0T143 (3), MSOP-8 (6), SC70 (2, 4, 5) SC70 (1, 2, 4, 5), SOT5x3 (2, 4, 5), SOT953 (4), µDFN (4) SC70 (2, 4), SOT5x3 (2, 4), SOT23 (4), MSOP10 (4), µDFN (4) NA NA NA 1206 (4) NA NA NA SOD723 NA 0402–1210 0402–1206 0402, 0603 NA 3–5pF 16pF 30pF 6–30pF 0.8–2.4pF 40–6000pF 40–1700pF 3–22pF 45-430pF <0.02µA max <25µA max <10µA max <0.5µA max <0.5µA max <25µA typ <25µA max <25µA typ <25µA max Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes ––––– ––––– ––––– No No Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes 7 ESD Suppressor Product Selection Guide SPATM Silicon Protection Arrays offer a high level of protection (up to 30kV per IEC 61000-4-2) with very low capacitance, leakage current and clamp voltage. For more robust applications, SP03-xx and SP30xx devices are available for EFT and Lightning transient threats per IEC 61000-4-4/5. Clamp Voltage (typ) Operating Leakage ESD Input Voltage Current Package Lines Protection Polarity (VDC) (Max µA) Level(1) Part Number Capacitance @ 0V (pF) SP03-3.3BTG 16 10V @ 100A 3.3 1.0 SOIC-8 2 Bi-polar 30kV SP03-6BTG 16 17V @ 100A 6 25.0 SOIC-8 2 Bi-polar 30kV SP03-8BTG 16 18V @ 100A 8 25.0 SOIC-8 2 Bi-polar 30kV SP0502BAHTG 30 6.8V @ 10mA 5.5 0.1 SOT23 2 Bi-polar 20kV SP0502BAJTG 30 6.8V @ 10mA 5.5 0.1 SC70-3 2 Bi-polar 20kV SP0503BAHTG 30 6.8V @ 10mA 5.5 0.1 SOT143 3 Bi-polar 20kV SP0504BAHTG 30 6.8V @ 10mA 5.5 0.1 SOT23-5 4 Bi-polar 20kV SP0504BAJTG 30 6.8V @ 10mA 5.5 0.1 SC70-5 4 Bi-polar 20kV SP0505BAHTG 30 6.8V @ 10mA 5.5 0.1 SOT23-6 5 Bi-polar 20kV SP0505BAJTG 30 6.8V @ 10mA 5.5 0.1 SC70-6 5 Bi-polar 20kV SP0506BAATG 30 6.8V @ 10mA 5.5 0.1 MSOP-8 6 Bi-polar 20kV SP1001-02JTG 12 9.7V @ 2A 5.5 0.5 SC70-3 2 Bi-polar 8kV SP1001-02XTG 12 9.7V @ 2A 5.5 0.5 SOT553 2 Bi-polar 8kV SP1001-04JTG 12 9.7V @ 2A 5.5 0.5 SC70-5 4 Bi-polar 8kV SP1001-04XTG 12 9.7V @ 2A 5.5 0.5 SOT553 4 Bi-polar 8kV SP1001-05JTG 12 9.7V @ 2A 5.5 0.5 SC70-6 5 Bi-polar 8kV SP1001-05XTG 12 9.7V @ 2A 5.5 0.5 SOT563 5 Bi-polar 8kV SP1002-01JTG 6 11.2V @ 2A 6 0.5 SC70-3 1 Bi-polar 8kV SP1002-02JTG 6 11.2V @ 2A 6 0.5 SC70-5 2 Bi-polar 8kV SP1003-01DTG 30 12.5V @ 7A 5 1.0 SOD723 1 Bi-polar 25kV SP1004-04VTG(2) 6 8.5V @ 1mA 6 0.1 SOT953 4 Bi-polar 8kV SP1010-04UTG(2) 6 7.5V @ 1mA 6 1.0 uDFN-6 4 Bi-polar 8kV SP3001-04JTG 0.8 10.6V @ 2A 6 0.5 SC70-6 4 Bi-polar 8kV SP3002-04HTG 1.1 10.6V @ 2A 6 0.5 SOT23-6 4 Bi-polar 12kV SP3002-04JTG 1.1 10.6V @ 2A 6 0.5 SC70-6 4 Bi-polar 12kV SP3002-04UTG 1.1 10.6V @ 2A 6 0.5 uDFN-6 4 Bi-polar 12kV SP3003-02JTG 0.8 11.8V @ 2A 6 0.5 SC70-5 2 Bi-polar 8kV SP3003-02XTG 0.8 11.8V @ 2A 6 0.5 SOT553 2 Bi-polar 8kV SP3003-04ATG 0.8 11.8V @ 2A 6 0.5 MSOP-10 4 Bi-polar 8kV SP3003-04JTG 0.8 11.8V @ 2A 6 0.5 SC70-6 4 Bi-polar 8kV SP3003-04XTG 0.8 11.8V @ 2A 6 0.5 SOT563 4 Bi-polar 8kV SP3004-04XTG 1.1 11.8V @ 2A 6 0.5 SOT563 4 Bi-polar 12kV SP3050-04HTG 2.4 13.2V @ 8A 6 0.5 SOT23-6 4 Bi-polar 20kV SP720ABG 3 VSUPPLY+2V @ 1A 30 0.02 SOIC-16 14 Bi-polar 4kV SP720APP 3 VSUPPLY+2V @ 1A 30 0.02 PDIP-16 14 Bi-polar 4kV SP721ABG 3 VSUPPLY+2V @ 1A 30 0.02 SOIC-8 6 Bi-polar 4kV SP721APP 3 VSUPPLY+2V @ 1A 30 0.02 PDIP-8 6 Bi-polar 4kV SP723ABG 5 VSUPPLY+2V @ 2A 30 0.02 SOIC-8 6 Bi-polar 8kV SP723APP 5 VSUPPLY+2V @ 2A 30 0.02 PDIP-8 6 Bi-polar 8kV SP724AHTG 3 VSUPPLY+2V @ 1A 20 0.01 SOT23-6 4 Bi-polar 8kV SP725ABG 5 VSUPPLY+2V @ 2A 30 0.02 SOIC-8 4 Bi-polar 8kV 1. Minimum ESD withstand voltage, tested according to IEC 61000-4-2, level 4 (Contact Discharge). 2. New items to be introduced Q3 2009. Please contact Littelfuse for availability. 8 www.littelfuse.com/ESD PulseGuard® ESD Suppressors offer extremely low capacitance for use in high-speed data circuits (IEEE 1394, USB 2.0, HDMI, DVI, etc.). Available in single-line and multi-line packages, they provide ESD protection while ensuring that signal integrity is maintained. Part Number Capacitance (pF) Clamp Voltage (V) PGB1010402 0.04 250 0–12 1 0402 1 Bi-polar 8kV PGB2010402 0.07 40 0–12 1 0402 1 Bi-polar 8kV PGB1010603 0.06 150 0–24 1 0603 1 Bi-polar 8kV PGB102ST23 0.12 150 0–24 1 SOT23 2 Bi-polar 8kV Part Number Capacitance (pF) Clamp Voltage (V)2 V5.5MLA0402 220 19 at 1A 0–5.5 <5 0402 1 Bi-polar 8kV V5.5MLA0603 660 19 at 2A 0–5.5 <25 0603 1 Bi-polar 8kV V5.5MLA0402L 70 30 at 1A 0–5.5 <5 0402 1 Bi-polar 8kV Multilayer Varistors (MLVs) MLVs provide board level protection against ESD, EFT, and other transients that occur on power supply, data and control lines. Single line devices are available in popular industry standard formats, and for more efficient board space usage, four-line devices are also available. Some MLVs also offer low band-pass filtering characteristics that filter high frequency noise from the circuit. ML MLE MLN MHS Operating Leakage ESD Input Voltage Current Package Lines Protection Polarity (VDC) (Max nA) Level(1) Operating Leakage Voltage Current (VDC)3 (Max nA) Package Lines ESD Input Protection Polarity Level(1) V9MLA0402 120 26 at 1A 0–9 <5 0402 1 Bi-polar 8kV V9MLA0402L 33 30 at 1A 0–9 <5 0402 1 Bi-polar 8kV V9MLA0603 420 28 at 2A 0–9 <25 0603 1 Bi-polar 8kV V9MLA0805L 450 20 at 2A 0–9 <25 0805 1 Bi-polar 8kV V12MLA0805L 350 25 at 2A 0–12 <25 0805 1 Bi-polar 8kV V14MLA0402 70 35 at 1A 0–14 <5 0402 1 Bi-polar 8kV V14MLA0603 150 40 at 2A 0–14 <25 0603 1 Bi-polar 8kV V14MLA0805 480 30 at 5A 0–14 <25 0805 1 Bi-polar 8kV V14MLA0805L 270 30 at 2A 0–14 <25 0805 1 Bi-polar 8kV V18MLA0402 40 46 at1A 0–18 <5 0402 1 Bi-polar 8kV V18MLA0603 100 46 at 2A 0–18 <25 0603 1 Bi-polar 8kV V18MLA0805 450 40 at 5A 0–18 <25 0805 1 Bi-polar 8kV V18MLA0805L 250 40 at 2A 0–18 <25 0805 1 Bi-polar 8kV V18MLE0402 40 50 at 1A 0–18 <5 0402 1 Bi-polar 8kV V18MLE0603 100 50 at 2A 0–18 <25 0603 1 Bi-polar 8kV V18MLE0603L 60 50 at 1A 0–18 <25 0603 1 Bi-polar 8kV V18MLE0805 500 50 at 5A 0–18 <25 0805 1 Bi-polar 8kV V18MLE0805L 100 50 at 2A 0–18 <25 0805 1 Bi-polar 8kV V5.5MLN41206 430 19 at 2A 0–5.5 <5 1206 4 Bi-polar 8kV V9MLN41206 250 28 at 2A 0–9 <5 1206 4 Bi-polar 8kV V14MLN41206 140 40 at 2A 0–14 <5 1206 4 Bi-polar 8kV V18MLN41206 100 50 at 2A 0–18 <5 1206 4 Bi-polar 8kV V18MLN41206L 45 50 at 1A 0–18 <5 1206 4 Bi-polar 8kV V0402MHS03 3 160 at 1A 0–42 <0.5 at 15V 0402 1 Bi-polar 8kV V0402MHS12 12 70 at 1A 0–18 <5 at 15V 0402 1 Bi-polar 8kV V0402MHS22 22 40 at 1A 0–9 <1 at 5.5V 0402 1 Bi-polar 8kV V0603MHS03 3 160 at 1A 0–42 <0.5 at 15V 0603 1 Bi-polar 8kV V0603MHS12 12 70 at 1A 0–18 <5 at 15V 0603 1 Bi-polar 8kV V0603MHS22 22 40 at 1A 0–9 <1 at 5.5V 0603 1 Bi-polar 8kV 1. Minimum ESD withstand voltage, tested according to IEC 61000-4-2, level 4 (Contact Discharge). 2. Clamp Voltage using 8/20µS waveform. 3. Leakage Current at Max Operating Voltage unless otherwise stated. 9 As the world's #1 brand in circuit protection Littelfuse offers the broadest and deepest portfolio of circuit protection products and a global network of technical support, backed by more than 80 years of application design expertise. Visit our design support center to access: > Reference Designs > Application Notes > Application Testing > SPICE Models > Local Technical Support > Product Samples > Technical Articles > Certification Documents > Data Sheets WWW.LITTELFUSE.COM/DESIGNSUPPORT Littelfuse offers technologies that protect sensitive electronics and their users against electrostatic discharge (ESD), load switching, lightning strikes, overloads, short circuits, power cross, ground faults and other threats. Overcurrent protection products: Fuses Littelfuse offers the world’s broadest range of fuse types and ratings, including cartridge, leaded, surface mount and thin film designs PTCs Positive Temperature Coefficient thermistor technology provides resettable current-limiting protection PRODUCT CATALOG & DESIGN PRODUCT CATALOG & DESIGN GUIDE Overvoltage protection products: T DUCT DUC PRODU PRO G CAT CA ALO Varistors Littelfuse offers surface mount Multi-layer Varistors (MLVs) and GUIDE PRODUCT CATALOG & DESIGN PRODUCT CATA GUID E LOG & DESIGN ODUC GUIDPR E T CATA PR LOG OD UCT & DESIGCA N TALO G GUIDE & DE SIGN GUID E & DESIGN GUIDE industrial Metal Oxide Varistors (MOVs) to protect against transients GDTs Gas Discharge Tubes (GDTs) to dissipate voltage through a contained plasma gas DUCT PRO LOG CATA SIGN & DE IDE GU Thyristors Littelfuse's solid state switches control the flow of current in a wide range of appliances, tools and equipment SIDACtor® Devices Overvoltage protection specifically designed for telecom and datacom requirements Silicon PulseGuard® ESD Suppressors Produc Protection Array ts (SPA) rge Tube Gas Discha ts duc (GDT) Pro ficien Coef ture ucts pera Tem tor Prod tive is Posi Therm ) TC (P t TVS Diodes Silicon transient voltage suppression (TVS) devices SPA™ Silicon Protection Arrays designed for analog and digital signal line protectionn PulseGuard® ESD Suppressors Small, fast-acting Electrostatic Discharge (ESD) suppressors To request catalogs for the Littelfuse portfolio of circuit protection technologies, please contact your authorized Littelfuse product representative or visit our website at www.littelfuse.com/catalogs ©2009 Littelfuse, Inc. Printed in USA Specifications descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to changes without notice. Visit www.littelfuse.com for the most up-to-date technical information. FORM NO. EC333 Revision Code: EC1333v1E0909