Fuseology Selection Guide Page 11 Fuseology Selection Guide

www.littelfuse.com Fuseology Selection Guide Outside World D+ D - VBU Signal Ground Shield Ground (2) V0402MHS03 1206L150 USB Port USB Controller V5.5MLA0603 PTC Cell Phone Battery - Control Battery + Signal Ground Shield Ground Battery Connector Battery Controller IC (3) V5.5MLA0402 (Multilayer Varistor) PTC Outside World D+ D - VBUS Signal Ground Shield Ground 1206L150 USB Port USB Controller V5.5MLA063 (2) PGB1010603 (PulseGuard ESD Suppressor) PTC Telco Tip Signal Ground RJ11 Connector Tx/Rx Circuits SMD/leaded SIDACtor Device Ring PTC 600R Series 250R Series Outside World TPA+ TPA- VBU Signal Ground Shield Ground 1812L110/33 1394 Port 1394 Controller V33MLA1206 (4) PGB1010603 (PulseGuard ESD Suppressor) TPB+ TPB- PTC Data Pair Power Source Equipment (PSE) Powered Device (PD) Switch/Hub Powered End Station PTC POWER OVER ETHERNET LI-ION BATTERY PACK The following are examples of typical circuits using Littelfuse PTCs in combination with other Littelfuse circuit protection devices to provide a comprehensive protection solution. Contact a Littelfuse application expert for design assistance or visit www.littelfuse.com/designcenter or www.littelfuse.com/PTCs for additional information. Be sure to to veryify specifications and test device performance before use in the end application. USB 1.1 USB 2.0 IEEE 1394 - FIREWIRE TIP/RING CIRCUIT - METALLIC Typical PTC Circuit Protection Designs 11

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