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ISO-9001 Registered TELECOMMUNICATIONS LINE FEED RESISTORS ALFR-2 SERIES LFR-2 SERIES • • • • • • Meets all test and specifications of TR-1089 & UL-1459 • 5.1 ohm to 100 ohm range • 1% tolerance • Meets GR-1089 lightning surge • Meets GR-1089 power cross • UL-497A approved Withstands lightning surges Opens safely under power cross Flameproof inorganic construction Auto-insertable, small size Meets FCC, EIA and UL requirements Made in Barbados SPECIFICATIONS: Limits - LFR-2/ALFR-2 Characteristics Wattage Temperature Coefficient Tolerance Load Life (1000 hrs.) Temperature Cycling Short Time Overload (5 x RW for 10 sec.) Moisture Load Resistance Range Lightning Surge (1000 V-10/1000 µsec) 25 negative & 25 positive surges (2 minute intervals) The standard ALFR-2 contains a 128°C thermal fuse. For faster fusing characteristics 110°C fuse is available. DIMENSIONS (Inches): The four (4) terminal leads shall be in the line to a tolerance to ±0.015 inch. The lead spacing dimensions as specified, shall be measures from the tip of the lead to the tip of the lead. The leads may have a 15° draft relative to the protector body. TYPICAL FUSING CURVE: FUSING TIME vs. FUSING POWER 1.045±0.020 0.030 Meniscus Permitted .450±.020 TIME TO FUSE • 2 watts 50 ppm/°C 1% and 5% 1% ∆R maximum 1% ∆R maximum 1% ∆R maximum 1% ∆R maximum 1 to 1600 ohms 2% ∆R maximum DESIGN & CONSTRUCTION: The Line Feed Resistor is a tight tolerance, stable resistor which has the additional capability to withstand both in rush currents and certain lightning pulse surges but would fuse safely when exposed to overload conditions such as 600 volt power line crosses. .125±.020 .150±.020 POWER DISSIPATION 0.025 Typ. 1 .100±.015 In circuit applications terminal leads 1 and 2 shall be connected together externally and leads 3 and 4 used for connection of the .265±.020 device. For proper performance and reduction of safety hazards the current flow should be from lead 3 to 4. 2 3 HOW TO ORDER: 4 Sample Part No.: .700±.015 0.070 Typ. LFR-2 100Ω Ω 1% .900±.015 Type Power 0.138±0.020 0.023Lead Dia. 0.032 Lead Dia. Resistance Value Tolerance ±1%, ±5% WIRE AND FILM TECHNOLOGIES 736 Greenway Road · PO Box 1860 · Boone, North Carolina 28607-1860 · Tel: 828-264-8861 · Fax: 828-264-8865 1 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: IRC: LFR2-2R00-J-013B LFR215R0J