Esd Suppression Design Guide Page 5 ESD Suppression Design Guide

The chart below shows the relationship between Data 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. Note that an application may use several different data protocols and could use as many different ESD suppressor 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, PULSE-GUARD ESD Suppressor or TVS Diode Array (SPA Diodes) devices should be considered. Littlelfuse MLV device can be connected near the I/O port to clamp the ESD or surge event with SMD package and wide capacitance range to as low as 3pF, MLV is widely used from Audio, control, as well as dataline communication such as USB2.0 If you require further assistance in selecting the appropriate Littelfuse ESD suppressor for your specific circuit, please contact your local Littelfuse products representative. 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. PRODUCT SERIES AND APPLICABLE DATA RATES AND PROTOCOLS Digital Still Camera Scanner Printer Hard Disk Drive Hub Desktop / Laptop Webpad Internet Appliance Set Top Box DVD PVR HDTV Monitor LCD TV LCD Projector PC Accessories and Peripherals with Serial Data Interfaces Typical Applications Serial Port (com) Keyboard Mouse DC Power Bus Keypad Buttons Speaker Microphone Audio Headset Parallel Port (LPT) Printer Scanner Control System Network Hardware PCI Adapter Hub Router Webswitch Cable/xDSL modem TFT Display Digital Video Recorder Hard Disk Drive Video Editing System Scanner Desktop / Laptop Digital Video Recorder Hard Disk Drive Video Editing System Scanner Desktop Laptop Set - Top Box (com) VCR Video In/Out Coputer Input and Periperal Devices PDA / PMP / Cell Phone/ Digital Camera/ & Game Controller Ports 0 .03 2 .13 25 125 320 Data Rate (Mbit/sec) Data Protocols 480 800 3,000 5,000 400 LCDs .05 RS232 Audio IEEE 1284 12 USB 1.1 10/100 Ethernet RS485 HDMI/USB3.0 IEEE1394b USB 2.0 SATA IEEE 1394a Video SP05, SMxx SDxx, SDxxC, SM24CANx, MLA, MLA Automotive, MLN SP720 thru SP725 SP2502L, SP2504N, SP2574N, SP3304N, SP3051,SP4020, SP4021, SP4060, SP4065, SRV05-4 SP1002, SPHVxx-C, SM712 SP1004, SP1007, SP1012 SP1001, SP1003, SP1005, SP1006, SP1010, SP1011, SPHVxx, MLE SLVU2.8, SLVU2.8-4,SP03-x, LC03-3.3, SRDA3.3, SRDA05 SP500x SP0524P, SP3010, SP3011 SP3012, SP3021, SP3022,SP3030 SP3001.SP3002, SP3003,SP3004 SP3006, SP3014, SP3031 CAN/LIN 1Gb Ethernet XGD1 MHS ESD Suppresion Design Guide 2016 Littelfuse ESD Suppression Design Guide www.littelfuse.com Data Protocol, Application and Product Selection 4

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