Sidactor Protection Thyristor Products Page 5 SIDACtor Protection Thyristor Products

SIDACtor Protection Thyristors 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/17 SIDACtor Product Description SIDACtor components are solid state crowbar devices designed to protect telecom equipment during hazardous transient conditions. Capitalizing on the latest in thyristor advancements, Littelfuse makes SIDACtor devices with a patented ion implant technology. This technology ensures effective protection within nanoseconds, up to 5000 A surge current ratings, and simple solutions for regulatory requirements such as GR 1089, TIA-968-A (formerly known as FCC Part 68), ITU-T K.20, ITU-T K.21, and UL 60950-1. Operation In the standby mode, SIDACtor devices exhibit a high off- state impedance, eliminating excessive leakage currents and appearing transparent to the circuits they protect. Upon application of a voltage exceeding the switching voltage (V S ), SIDACtor devices crowbar and simulate a short circuit condition until the current flowing through the device is either interrupted or drops below the SIDACtor device's holding current (I H ). Once this occurs, SIDACtor devices reset and return to their high off-state impedance. Figure 1.1 V-I Characteristics I H I T I S I DRM V DRM V T +V -V +I -I V S Advantages SIDACtor devices: Cannot be damaged by voltage Eliminate hysteresis and heat dissipation typically found with clamping devices Eliminate voltage overshoot caused by fast-rising transients Are non-degenerative Will not fatigue Have Low capacitance, making them ideal for high- speed transmission equipment Applications* When protecting telecommunication circuits, SIDACtor devices are connected between tip-to-ring for metallic protection and between tip-to-ground and ring-to-ground for longitudinal protection. They typically are placed behind some type of current-limiting device, such as the Littelfuse TeleLink lightning tolerant fuse or the Littlefuse POLYFUSE lightning tolerant resettable PTC devices. Common applications include: T1/E1/J1 and HDSL2/4 Subscriber Line Interface Card (SLIC) in Fiber to the Curb (FTTC) and Fiber to the Premises (FTTP) Non-Fiber SLIC for Central Office (CO) locations and Remote Terminals (RT) xDSL applications such as ADSL, ADSL2+, VDSL, and VDSL2+ Ethernet 10/100/1000BaseT, PoE (Power over Ethernet) systems Customer Premises Equipment (CPE) such as VoIP, modems, answering machines, multi-function printers, telephones, fax machines, and security systems ISDN "U" and "S/T" interfaces Baystation T1/E1/J1, T3 (DS3) trunk cards PBXs, IP PBXs, KSUs, and other switches Main Distribution Frames (MDFs), five-pin modules, Network Interface Devices (NIDs) For more information regarding specific applications, design requirements, or surge suppression, please contact Littelfuse directly at +1 800-999-9445 or through your local area representative. To find the Littelfuse representative near you visit http://www.littelfuse.com/contact. * See also SIDACtor Family Application Selector Table (page7 )

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