POLYFUSE® Resettable PTCs Radial Leaded 250R Series Description • The 250R series is designed to protect against short duration high voltage fault currents (power cross or power induction surge) typically found in telecom applications (250Vrms). The series can be used to help telecom networking equipment meet the protection requirements specified in ITU K.20 and K.21. Features • RoHS compliant and lead-free • Fast time-to-trip • Binned and sorted narrow resistance ranges available Agency Approvals AGENCY AGENCY FILE NUMBER • 0.08 – 0.18 Hold current range, 60VDC operating voltage • 250VAC interrupt rating E183209 Applications R50082521 • Customer Premises Equipment (CPE) • Central Office (CO)/ Telecom Centers • LAN/WAN Equipment • Access equipment Electrical Characteristics Vint / Vop I max (A) Pd max. (W) 0.16 250/60 3 0.16 250/60 3 0.12 0.24 250/60 250R120-RA 0.12 0.24 250R120-RC 0.12 0.24 250R120-RF 0.12 250R120-R1 0.12 250R120-R2 Part Number I hold (A) I trip (A) 250R080T 0.08 250R080 0.08 250R120 Vmax Maximum Time To Trip Agency Approvals Resistance Current (A) Time (Sec.) R min (Ω) R typ (Ω) R 1max (Ω) 1 0.35 3 15 22 33 X X 1 0.35 3 14 22 33 X X 3 1 1 1.5 4 8 16 X X 250/60 3 1 1 1.0 7 9 16 X X 250/60 3 1 1 0.85 5.4 7.5 14 X X 0.24 250/60 3 1 1 0.7 6 10.5 16 X X 0.24 250/60 3 1 1 0.8 6 9 16 X X 0.12 0.24 250/60 3 1 1 0.7 8 10.5 16 X X 250R120-R3 0.12 0.24 250/60 3 1 1 1 8 10 16 X X 250R120T 0.12 0.24 250/60 3 1 1 1.2 7 12 16 X X 250R145 0.145 0.29 250/60 3 1 1 2.5 3 6 14 X X 250R145-RA 0.145 0.29 250/60 3 1 1 5 3 5.5 12 X X 250R145-RB 0.145 0.29 250/60 3 1 1 2.5 4.5 6 14 X X 250R145T 0.145 0.29 250/60 3 1 1 2.0 5.4 7.5 14 X X 250R180 0.18 0.65 250/60 10 1.8 1 21 0.8 2.2 4 X X 250R180T 0.18 0.65 250/60 10 1.8 1 20 1.4 3.9 4.5 X X *typical value C: coated device T: pre-tripped device 250R Series Specifications are subject to change without notice. Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse POLYFUSE® Resettable PTCs Radial Leaded Temperature Rerating Ambient Operation Temperature -40°C -20°C 0°C 23°C Part Number 40°C 50°C 60°C 70°C 85°C Hold Current (A) 250R080 0.12 0.11 0.09 0.08 0.06 0.05 0.05 0.04 0.03 250R080T 0.12 0.11 0.09 0.08 0.06 0.05 0.05 0.04 0.03 250R120 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.06 0.05 250R120T 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.06 0.05 250R145 0.26 0.20 0.17 0.145 0.12 0.11 0.09 0.08 0.06 250R145T 0.26 0.20 0.17 0.145 0.12 0.11 0.09 0.08 0.06 250R180 0.28 0.23 0.21 0.18 0.16 0.13 0.10 0.11 0.083 250R180T 0.28 0.23 0.21 0.18 0.16 0.13 0.10 0.11 0.083 250R Series Temperature Rerating Curve 170% 0.180A 0.080A 0.120A 0.145A Average Time Current Curves 150% Percentage of Rated Current 100000 10000 TIME IN SECONDS 1000 130% 110% 90% 70% 50% 30% 100 10% -40 -30 -20 10 -10 0 10 20 30 40 Temperature (°C) 50 60 70 80 1 0.100 0.010 0.001 0.02 0.100 1 10 100 CURRENT IN AMPERES Specifications are subject to change without notice. Note: 1.00 means the number one with two decimal places. AKL V3.9 06.05.18 The average time current curves and temperature rerating curve performance is affected by a number or variables, and these curves provided as guidance only. Customer must verify the performance in their application. 250R Series Specifications are subject to change without notice. Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse POLYFUSE® Resettable PTCs Radial Leaded Agency Specification Selection Guide For Telecom and Networking Applications Product Lightning Power Cross 250R120 250R145 ITU K.20/21/45 – 1.5kV 10/700μs ITU K.20/21/45 – 4kV 10/700μs* ITU K.20/21/45 – 1.5kV 10/700μs ITU K.20/21/45 – 4kV 10/700μs* Telcordia GR – 974 – 1.0kV 10/1000μs ITU K.20/21/45 – 230Vac, 10Ω ITU K.20/21/45 – 600Vac, 600Ω ITU K.20/21/45 – 230Vac, 10Ω ITU K.20/21/45 – 600Vac, 600Ω Telcordia GR – 974- 283Vac, 10A 250R180 *Devices should be independently evaluated and tested for use in any specific application Protection Application Guide Region/Specification Application South America/Asia/Europe ITU K.45 *Access network equipment Remote terminal Repeaters WAN equipment Cross –connect South America/Asia/Europe ITU K.21 Customer and IT equipment Analog modems ADSL, xDSL Phone sets, PBX systems Internet appliances POS terminals South America/Asia/Europe ITU K.20 Central Office POTS/ISDN linecards T1/E1/J1 linecards ADSL/VDSL splitters CSU/DSU North America Telcordia GR-974 *Primary protection modules MDF modules Network interface South America/Asia/Europe ITU K.20 North America Telcordia GR-1089 South America/Asia/Europe ITU K.20 and K.21 Device Selection 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T *Intrabuilding communication systems LAN, VOIP cards Local loop handsets 250R180 250R180T 250R145 250R145T 250R120 250R120T LAN Intrabuilding power cross Protection LAN equipment, IP phone 250R080 *Resistance binned parts are recommended 250R Series Specifications are subject to change without notice. Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse POLYFUSE® Resettable PTCs Radial Leaded Soldering Parameters - Wave Soldering Peak Temp/ Duration Time Wave Soldering 260°C < 5 Sec > 220°C 2 Sec ~ 20 Sec Preheat 140°C ~ 180°C 180 Sec ~ 210 Sec 0°C~35°C < 70%RH Storage Condition Soldering 260 Cooling 220 Temperature (°C) Condition • Recommended soldering methods: heat element oven or N2 environment for lead-free. • Devices are designed to be wave soldered to the bottom side of the board. 190 160 0 Preheating 2 to 5 180 to 210 • Devices can be cleaned using standard industry methods and solvents. 20-30 Time(s) • This profile can be used for lead-free device Note: If soldering temperatures exceed the recommended profile, devices may not meet the performance requirements. Soldering Parameters - Solder Reflow Peak Temp/ Duration Time Reflow 260°C > 5 Sec > 220°C 30 Sec ~ 60 Sec Preheat 160°C ~ 190°C 60 Sec ~ 90 Sec 0°C~35°C, < 70%RH Storage Condition Soldering 260 Cooling 220 Temperature (°C) Condition • Recommended reflow methods: IR, vapor phase oven, hot air oven, N2 environment for lead-free. • Devices are not designed to be wave soldered to the bottom side of the board. 190 160 0 Preheating 60 to 90 30 to 60 • Devices can be cleaned using standard industry methods and solvents. 120 Time(s) Note: If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements. Physical Specifications Environmental Specifications Lead Material Tin-plated copper Operating/Storage Temperature -40°C to +85°C Soldering Characteristics Solderability per MIL-STD-202, Method 208E Maximum Device Surface Temperature in Tripped State 125°C Insulating Material Cured, flame retardant epoxy polymer meets UL94V-0 requirements. Passive Aging 65°C/85°C, 1000 hours Device Labeling Marked with LF, voltage, current rating, and date code. Humidity Aging +85°C, 85%R.H. 1000 hours Thermal Shock MIL-STD-202F Method 107G +125°C to -55°C 10 times Solvent Resistance MIL-STD-202, Method 215F 250R Series Specifications are subject to change without notice. Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse POLYFUSE® Resettable PTCs Radial Leaded Dimensions Figure 2 Figure 1 C A A Marking Marking B F E A Max. A 0.23 250R080 250R080T Figure 2 C D E Inches Figure mm 2 Inches Inches mm Inches mm Max. C Max. Max. Max. Max.A Min. Min. Typ. 5.8 0.39 9.9 0.18 4.6 0.19 4.7 0.20 5.8 0.39 9.9 250 0.18 4.6 0.19 4.7 250 0.20 0.15 3.8 4.7 0.18 Marking 0.19 4.6 4.7 11 0.18 4.6 0.19 0.23 250R120 B F E Figure 1 Part Number B D D Figure 1 Inches mm C 0.26 Littelfuse Trademark 080 XXXX Littelfuse Trademark Lead (dia) Material Figure 0.65 Sn/Cu 1 0.65 Sn/Cu 1 0.026 0.65 Sn/Cu 2 0.026 0.65 Sn/Cu 2 5.1 0.026 0.65 Sn/Cu 2 Inches mm 5.1 0.026 5.1 0.026 0.20 5.1 0.20 5.1 4.7 0.20 120 XXXX C Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information) 6.5 0.43 0.26 6.5 0.43 250R120-RC 0.26 6.5 0.43 250R120-RF 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R120-R1 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 D 250R120-R2 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R120-R3 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 0.26 6.5 0.43 11 0.18 4.6 E 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R145 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R145-RA 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R145-RB 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R145T 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 2 250R180 0.37 9.5 0.47 12 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 1 250F180T 0.37 9.5 0.47 12 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 1 250R120T E F B 11 D 0.19 mm Typ. 250R120-RA Marking 11 Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information) Physical Characteristics B F Part Marking System Littelfuse Trademark 250 080 XXXX Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information) 250R Series Specifications are subject to change without notice. Littelfuse Trademark 250 Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information) 120 XXXX Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse POLYFUSE® Resettable PTCs Radial Leaded Part Numbering System 250 R 120 - RA Z R PACKAGING STYLE BLANK: Bulk R: Tape & Ammo QUANTITY CODE: M=1000 U=500 Z=1200 SERIES Rx: Resistance Range (x = A-Z or 1-9) [not applicable for all parts] T: PRE-TRIPPED DEVICE (OPTIONAL) I HOLD CURRENT CODE (SEE TABLE BELOW) R: RADIAL PEAK VOLTAGE RATING Packaging I hold (A) I hold Code 0.080 080 0.120 120 0.145 145 0.180 180 Packaging Option Quantity Quantity & Packaging Codes Bulk 500 U Tape and Ammo 1500 DR Bulk 500 U Tape and Ammo 1200 ZR Bulk 500 U Tape and Ammo 1200 ZR Bulk 200 F Tape and Ammo 1000 MR 250R Series Specifications are subject to change without notice. Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse