Surface Mount Fuses Surge Resistant > 461 Series TeleLink® Fuse 461 Series TeleLink® Fuse RoHS Description The Littelfuse 461 Series TeleLink® Surface Mount, Surge Resistant Fuse, offers over-current protection for a wide range of telecom applications without requiring a series resistor. When used in conjunction with a Littelfuse SIDACtor® Transient Voltage Suppressor (TVS) or a GreentubeTM Gas Plasma Arrestor, this combination provides a compliant solution for standards and recommendations such as GR-1089–Core, TIA-968-A, UL/ EN/IEC 60950, and ITU K.20 and K.21. The coordination requirement contained in GR-1089–Core, and ITU K.20/21 may require a series of impedance devices. Agency Approvals Features • Surface mount surge • 2A rating has improved Agency Agency File Number Ampere Range resistant Slo-Blo® fuse temperature rise E10480 0.5A - 2A performance under 2.2A • Meet UL 60950 3rd Edition surge current testing when 29862 0.5A - 2A power cross requirements compared with 1.25A standard alone rating • Designed to allow • Product is Halogen Free Electrical Characteristics for Series compliance with Telcordia and RoHS compliant and GR-1089-CORE and TIA- compatible with lead- % of Ampere Rating Opening Time 968-A (formerly FCC Part free solder and higher 68) Surge Specifications 100% 4 hours, Minimum temperature profiles when 250% 1 sec., Minimum; 120 secs., Maximum • Provide coordinated ordered with Standard protection with Littelfuse Silver Plated Brass Caps SIDACtor® Transient Voltage • UL Recognized to UL/CSA/ Suppressor (TVS)or a Maximum Temperature Rise GreentubeTM Gas Plasma NMX 248-1 and UL/CSA/ NMX 248-14 Arrestor, without series Telecom Nano2® Fuse Temperature Reading resistors 04611.25 < 82°C (180°F) • Designed to serve 0461002. < 50°C (122°F) the requirements Higher Currents and PCB layout designs can affect this parameter. of a wide range of Readings are measured at rated current after temperature stabilizes. telecommunication and networking equipment Additional Information Applications • T1/E1/J1 and HDSL2/4 • SLIC interface portion of Fiber to the Curb (FTTC) and Fiber to the Premises (FTTP) Datasheet Resources Samples • Non-Fiber SLIC interface for Central Office (CO) locations and Remote Terminals (RT) • xDSL applications such as ADSL, ADSL2+, VDSL, and VDSL2+ • Ethernet 10/100/1000BaseT • POTS applications such as modems, answering machines, telephones, fax machines, and security systems • ISDN “U” interface • Baystation T1/E1/J1, T3 (DS3) trunk cards © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/02/19

Surface Mount Fuses Surge Resistant > 461 Series TeleLink® Fuse Electrical Specifications by Item Ampere Max Agency Approvals Voltage Interrupting Nominal Cold Nominal Melting Rating Amp Code Rating Rating Resistance (Ohms) I2t (A2sec) (A) (V) 0.500 .500 600 50A @ 250 VAC 0.560 0.8401 x x 1.25 1.25 600 60 A @600 VAC .1040 16.51 x x 2.00 002. 600 100 A @80 VDC .0450 17.51 x x 1 I2t is calculated at 10 msecs. or less. I2t at 10 times rated current has a typical value of: 24 A2sec (2.0A), 22 A2sec (1.25A), 1.3 A2sec (0.5A). • Typical inductance <40nH up to 500 MHz. • Resistance changes 0.5% for every °C. • Resistance is measured at 10% rated current. Temperature Re-rating Curve Average Time Current Curves A A 0 5 100 .50 1.2 2A 10 S D N CO 1 E S N E I M TI 0.1 0.01 Note: 1. Re-rating depicted in this curve is in addition to the standard re-rating of 25% for continuous operation. 0.001 0.1 1 10 100 1000 CURRENT IN AMPERES GR 1089 Inter-building requirements GR 1089 1st level lighting surge inter-building (Equipment under test can not be damaged and must continue to operate properly) Minimum Peak Minimum Peak Max. Rise/Min. Repetitions Fuse Surge Voltage (V) Current (A) Decay (µs) Each Polarity Choices 1 600 100 10/1000 25 1.25, 2.0 2 1000 100 10/360 25 1.25, 2.0 3 1000 100 10/1000 25 1.25, 2.0 4 2500 500 2/10 10 1.25, 2.0 5 1000 25 10/360 5 0.5, 1.25, 2.0 If sufficient series resistance is used, then the 0.5 fuse may be used in test conditions 1-4. GR 1089 2nd level lightning surge telecom port (Equipment under test shall not become a fire or electrical safety hazard) Minimum Peak Minimum Peak Max. Rise/Min. Repe-titions Fuse Surge Voltage (V) Current (A) Decay (µs) Each Polarity Choices 1 5000 500 2/10 1 0.5, 1.25, 2.0 Alter-native 5000 500/8=625 8/10 1 0.5, 1.25, 2.0 The 0.5 fuse will open during these test conditions. The 1.25 & 2.0 will not open thus providing operational compliance. © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/02/19

Surface Mount Fuses Surge Resistant > 461 Series TeleLink® Fuse GR 1089 AC power fault 1st level inter-building (fuse not allowed to open) GR 1089 AC power fault 2nd level (fuse can open but must open in a safe and controlled manner) Short Circuit Primary Fuse Test ShortCircuit Test Vrms Hits Duration Vrms Duration Fuse Current (A) Protector Choices Circuit Current(A) 1 50 0.33 1 15 min. removed 1.25, 2.0 1 120,277 25 15 min. 0.5, 1.25, 2.0 2 100 0.17 1 15 min. removed 1.25, 2.0 2 600 60 5 secs. 0.5, 1.25, 2.0 3 200,400, 600 1 60 1 sec. removed 1.25, 2.0 3 600 7 5 secs. 0.5, 1.25, 2.0 4 1000 1 60 1 sec. operative 1.25, 2.0 4 100-600 2.2 15 min.. 0.5, 1.25, 2.0 5 Diagram Diagram 60 5 secs. removed 1.25, 2.0 5 Diagram Diagram 15 min. 0.5, 1.25, 2.0 6 600 0.5 1 30 secs. removed 1.25, 2.0 Fuse must open before wiring simulator fuse (MDL 2.0). 7 440 2.2 5 2 secs. removed 1.25, 2.0 8 600 3 1 1.1 secs. removed 1.25, 2.0 9 1000 5 1 0.4 sec. in place 1.25, 2.0 TIA –968-A (formerly FCC Part 68) Surge Waveforms (fuse can not open during type B events) Surge Voltage (V) Waveform (µs) Current (A) Repetitions Recommended Fuse Metallic A 800 10×560 100 1 ea. polarity 1.25 Longitudinal A 1500 10×160 200 1 ea. polarity 1.25 Metallic B 1000 9×720 25 1 ea. polarity 1.25 Longitudinal B 1500 9×720 37.5 1 ea. polarity 1.25 For the type A events the 0.5 fuse will open, providing non-operational compliance. The 1.25 & 2.0 will not open, providing for operational compliance with TIA-968-A type A surge events. UL 60950 requirements Dimensions UL60950 (EN 60950) (formerly UL 1950) Power Cross (L = longitudinal, M = 3.25 metallic) 10.10 (.128") (.397") Test Number Voltage (V) Current (A) Time Fuse Choices 6.10 3.12 (.240") 3.43 L1 600 40 1.5 secs. 0.5, 1.25, 2.0 LF 1.25A T (.123") (.135") L2 600 7 5 secs. 0.5, 1.25, 2.0 L3 600 2.2 30 min. 0.5, 1.25, 2.0 3.12 12.6 L4 200 2.2 30 min. 0.5, 1.25, 2.0 (.123") (.496") L5 120 25 30 min. 0.5, 1.25, 2.0 1.70 typ Recommended Pad Layout M1 600 40 1.5 secs. 0.5, 1.25, 2.0 (.067") M2 600 7 5 secs. 0.5, 1.25, 2.0 M3 600 2.2 30 min. 0.5, 1.25, 2.0 M4 600 2.2 30 min. 0.5, 1.25, 2.0 Selection of test number depends on current limiting F fire enclosure/spacing of end product • 26 AWG line cord removes L1/M1 test requirement • L5 conducted only if product does not pass section 6.1.2 • L2,M2,L3,M3,L4,M4 conducted if not in a fire enclosure Fuse must open before the wiring simulator fuse (MDL 2.0). UL60950 (EN 60950) (formerly UL 1950) Impulse Test and Steady-State Electric Strength Test Test Voltage (V) Current (A) Waveform Repetitions Fuse Choices Impulse For handheld units 2500 62.5 10×700ms +/- 10 w/60 secs. rest 0.5, 1.25, 2.0 Non handheld 1500 37.5 10×700ms +/- 10 w/60 secs. rest 0.5, 1.25, 2.0 Steady-State For handheld units 1500 60Hz 0.5, 1.25, 2.0 Non handheld 1000 60Hz 0.5, 1.25, 2.0 © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/02/19

Surface Mount Fuses Surge Resistant > 461 Series TeleLink® Fuse Soldering Parameters Reflow Condition Pb – free assembly t P - Temperature Min (Ts(min)) 150°C TP Critical Zone Pre Heat - Temperature Max (Ts(max)) 200°C Ramp-up TL to TP - Time (Min to Max) (t) 60 – 180 seconds T s L t Average Ramp-up Rate (Liquidus Temp (TL) to peak) 5°C/second max. eruTS(max) L T to T - Ramp-up Rate 5°C/second max. ta S(max) L r Ramp-down e - Temperature (T) (Liquidus) 217°C p Preheat Reflow L mTS(min) - Temperature (tL) 60 – 150 seconds eT tS Peak Temperature (T) 260+0/–5 °C P Time within 5°C of actual peak Temperature (t) 20 – 40 seconds 25 p time to peak temperature Ramp-down Rate 6°C/second max. (t 25ºC to peak) Time Time 25°C to peak Temperature (T) 8 minutes max. P Do not exceed 260°C Product Characteristics Part Numbering System Body: Ceramic 0461 1.25 E R Materials Terminations: Silver-plated Caps Product Marking Brand Logo, Ampere Rating, T Series Operating Temperature -55°C to 125°C Amp Code* Moisture Sensitivity Level Level 1, J-STD-020 Refer to Electrical Charac- Solderability IEC-60127-4 (215°C immersion, 3 seconds) teristics table Resistance to Dissolution IPC / EIA J-STD-002-Test D 260°C for 120 of Metallization seconds Quantity code MIL-STD-202, Method 107, Test Condition B, E = 2500 pcs Thermal Shock -55°C to +125°C, 30 minutes @ each extreme Packaging code MIL-STD-202, Method 213, Test Condition A - Mechanical Shock Half Sine, 50 G's, 11 msecs. duration R = Tape and Reel *Example: High Frequency Vibration MIL-STD-202, Method 204, Test Condition D 2 amp product is 0461002.ER Moisture Resistance MIL-STD-202, Method 106, 50 cycles (1.25 amp product shown above) Board deflection per EIA / IS-722, 1mm Terminal Strength deflection for 1 minute Packaging MIL-STD-202, Method 211, Test Condition A, 5 Terminal Attachment lbs applied to end caps Packaging Packaging Quantity & Packaging Quantity Option Specification Code 24mm Tape and EIA RS-481-2 (IEC 2500 ER Reel 286, part 3) Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/02/19