POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series 250R Series RoHS * 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 • 0.08 – 0.18 hold current • Binned and sorted narrow range, 60VDC operating resistance ranges available voltage • RoHS compliant, Lead- Agency Approvals • 250VAC interrupt rating Free and Halogen-Free* • Fast time–to-trip AGENCY AGENCY FILE NUMBER Applications E183209 • Customer Premises • LAN/WAN equipment Equipment (CPE) • Access equipment R50120008 • Central Office (CO)/ telecom centers Electrical Characteristics Maximum Time Agency Part Number I hold I trip Vmax I max tPy pd. To Trip Resistance Approvals (A) (A) Vint / Vop (A) (W) Current Time R min R typ R 1max (A) (Sec.) (Ω) (Ω) (Ω) 250R080 0.08 0.16 250/60 3 1 0.35 4.0 14 22 33 X X 250R080T 0.08 0.16 250/60 3 1 0.35 4.0 15 22 33 X X 250R120 0.12 0.24 250/60 3 1 1 2.5 4 8 16 X X 250R120-RA 0.12 0.24 250/60 3 1 1 2.5 7 9 16 X X 250R120-RC 0.12 0.24 250/60 3 1 1 3.0 5.4 7.5 14 X X 250R120-RF 0.12 0.24 250/60 3 1 1 2.5 6 10.5 16 X X 250R120-R1 0.12 0.24 250/60 3 1 1 2.5 6 9 16 X X 250R120-R2 0.12 0.24 250/60 3 1 1 2.5 8 10.5 16 X X 250R120-R3 0.12 0.24 250/60 3 1 1 2.5 8 10 16 X X 250R120T 0.12 0.24 250/60 3 1 1 2.5 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 2.5 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 2.5 5.4 7.5 14 X X 250R180 0.18 0.65 250/60 10 1.8 1 20 0.8 2.2 4 X X 250R180T 0.18 0.65 250/60 10 1.8 1 21 1.4 3.9 4.5 X X Items with T at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information. I = Hold current: maximum current device will pass without tripping in 20°C still air. R = Minimum resistance of device in initial (un-soldered) state. hold min I = Trip current: minimum current at which the device will trip in 20°C still air. R = Typical resistance of device in initial (un-soldered) state. trip typ V = Maximum voltage the device can withstand without damage at rated current (I max) R = Maximum resistance of device at 20°C measured one hour after tripping. int 1max V = The device regular operation voltage Caution: Operation beyond the specified rating may result in damage and possible arcing op I = Maximum fault current device can withstand without damage at rated voltage (V ) and flame. max max P = Power dissipated from device when in the tripped state at 20°C still air. d * Effective January 1, 2010, all 250R PTC products will be manufactured Halogen Free (HF). Existing Non-Halogen Free 250R PTC products may continue to be sold, until supplies are depleted. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17

POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series Temperature Rerating Ambient Operation Temperature -40°C -20°C 0°C 20°C 40°C 50°C 60°C 70°C 85°C Part Number 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 Average Time Current Curves Temperature Rerating Curve 170% 100000 150% nt 130% e 10000 urr d C 110% e at 1000 e of R 90% g m) centa 70% oh 100 Per 50% ce ( 30% n a esist 10 10%-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 R Temperature (°C) 1 Note: Typical Temperature rerating curve, refer to table for derating data B 0.1 C A Additional Information D 0.01 0.11 10 100 Fault Current in Amperes Datasheet Resources SSaammpplleess 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. Curve I hold Designation (A) A 0.18 B 0.145 C 0.12 D 0.80 © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17

POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series Agency Specification Selection Guide For Telecom and Networking Applications Product Lightning Power Cross 250R120 ITU K.20/21/45 – 1.5kV 10/700μs ITU K.20/21/45 – 230Vac, 10Ω 250R145 ITU K.20/21/45 – 4kV 10/700μs* ITU K.20/21/45 – 600Vac, 600Ω ITU K.20/21/45 – 1.5kV 10/700μs ITU K.20/21/45 – 230Vac, 10Ω 250R180 ITU K.20/21/45 – 4kV 10/700μs* ITU K.20/21/45 – 600Vac, 600Ω Telcordia GR – 974 – 1.0kV 10/1000μs Telcordia GR – 974- 283Vac, 10A *Devices should be independently evaluated and tested for use in any specific application Protection Application Guide Region/Specification Application Device Selection 250R180 *Access network equipment 250R180T Remote terminal South America/Asia/Europe 250R145 Repeaters ITU K.45 250R145T WAN equipment 250R120 Cross –connect 250R120T Customer and IT equipment 250R180 Analog modems 250R180T South America/Asia/Europe ADSL, xDSL 250R145 ITU K.21 Phone sets, PBX systems 250R145T Internet appliances 250R120 POS terminals 250R120T 250R180 Central Office 250R180T POTS/ISDN linecards South America/Asia/Europe 250R145 T1/E1/J1 linecards ITU K.20 250R145T ADSL/VDSL splitters 250R120 CSU/DSU 250R120T North America Telcordia 250R180 GR-974 250R180T *Primary protection modules 250R145 MDF modules South America/Asia/Europe 250R145T Network interface ITU K.20 250R120 250R120T 250R180 North America Telcordia 250R180T GR-1089 *Intrabuilding communication systems 250R145 LAN, VOIP cards 250R145T South America/Asia/Europe Local loop handsets 250R120 ITU K.20 and K.21 250R120T LAN Intrabuilding power cross Protection 250R080 LAN equipment, IP phone *Resistance binned parts are recommended © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17

POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series Soldering Parameters - Wave Soldering Condition Wave Soldering Peak Temp/ Duration Time 260°C < 5 Sec > 220°C 2 Sec ~ 20 Sec 260 Soldering Cooling 220 Preheat 140°C ~ 180°C 180 Sec ~ 210 Sec C) • S RNte2o ceroangmveirm oCneomnnddeeitndiot nsfoorld leearidn-gfr meee.thods: h0e°Ca~t 3e5le°Cm <e n7t0 %ovReHn or Temperature (° 116900 Preheating • Devices are designed to be wave soldered to the bottom side of the board. • Devices can be cleaned using standard industry methods 0 180 to 210 2 to 5 20-30 and solvents. 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. Physical Specifications Environmental Specifications Operating/Storage Lead Material Tin-plated Copper -40°C to +85°C Temperature Soldering Solderability per MIL–STD–202, Maximum Device Surface 125°C Characteristics Method 208 Temperature in Tripped State Cured, flame retardant epoxy polymer Insulating Material Passive Aging 65°C/85°C, 1000 hours meets UL94V-0 requirements. Marked with 'LF', voltage, current rating, Device Labeling Humidity Aging +85°C, 85% R.H,.1000 hours and date code. MIL–STD–202, Method 107 Thermal Shock +125°C to -55°C 10 times Solvent Resistance MIL–STD–202, Method 215 Moisture Sesitivity Level Level 1, J–STD–020 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. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17

Figure 1 Figure 2 A C A C B B D D F F E E POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series Dimensions Part Marking System Figure 1 Figure 2 A C A C Littelfuse 250 Voltage Rating Littelfuse 250 Voltage Rating Trademark 080 Current Rating Trademark 120 Current Rating XXXX Date Code XXXX Date Code (Contact Littelfuse (Contact Littelfuse B B finofro ardmdaittiioonna)l finofro ardmdaittiioonna)l D D E F E F Figure 1 Figure 2 A B C D E Physical Characteristics Part Number Figure Inches mm Inches mm Inches mm Inches mm Inches mm Lead (dia) Material Max. Max. Max. Max. Max. Max. Min. Min. Typ. Typ. Inches mm 250R080 1 0.23 5.8 0.39 9.9 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu LTriattdeelfmusa2erk25500RR0X201X588X002X00T CD(VCouaolrttnreaet gCanecto tRRd Leaaittttiinnegglfu21se LTriattdeelfmusaerk 00..2273X21X52X00X 65..88CD(VCouaoltrtneraet gCanecto tRRd Leaaittttii00nnegglfu..s43e 39 91.19 00..1188 44..66 00..1199 44..77 00..2200 55..11 00..002266 00..6655 SSnn//CCuu for additional for additional information) information) 250R120-RA 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R120-RC 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R120-RF 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R120-R1 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R120-R2 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R120-R3 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R120T 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R145 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R145-RA 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R145-RB 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R145T 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 Sn/Cu 250R180 1 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 250R180T 1 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 WARNING • Users shall independently assess the suitability of these devices for each of their applications • Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire • These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be repetitive or prolonged in duration • Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices • These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses • Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17

POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series Part Ordering Number System 250 R 120 - RA Z R PACKAGING STYLE BLANK: Bulk R: Tape & Ammo QUANTITY CODE: F=200 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 CURRENT CODE (Refer to Packaging or Electrical Characteristics tables) HOLD R: RADIAL PEAK VOLTAGE RATING Packaging Ordering I I Packaging Quantity & Part Number hold hold Quantity Number (A) Code Option Packaging Codes 250R080U Bulk 500 U 250R080 0.080 080 250R080ZR Tape and Ammo 1200 ZR 250R080TU Bulk 500 U 250R080T 0.080 080 250R080TZR Tape and Ammo 1200 ZR 250R120U Bulk 500 U 250R120 0.120 120 250R120ZR Tape and Ammo 1200 ZR 250R120-RAU Bulk 500 U 250R120-RA 0.120 120 250R120-RAZR Tape and Ammo 1200 ZR 250R120-RCU Bulk 500 U 250R120-RC 0.120 120 250R120-RCZR Tape and Ammo 1200 ZR 250R120-RFU Bulk 500 U 250R120-RF 0.120 120 250R120-RFZR Tape and Ammo 1200 ZR 250R120-R1U Bulk 500 U 250R120-R1 0.120 120 250R120-R1ZR Tape and Ammo 1200 ZR 250R120-R2U Bulk 500 U 250R120-R2 0.120 120 250R120-R2ZR Tape and Ammo 1200 ZR 250R120-R3U Bulk 500 U 250R120-R3 0.120 120 250R120-R3ZR Tape and Ammo 1200 ZR 250R120TU Bulk 500 U 250R120T 0.120 120 250R120TZR Tape and Ammo 1200 ZR 250R145U Bulk 500 U 250R145 0.145 145 250R145ZR Tape and Ammo 1200 ZR 250R145-RAU Bulk 500 U 250R145-RA 0.145 145 250R145-RAZR Tape and Ammo 1200 ZR 250R145-RBU Bulk 500 U 250R145-RB 0.145 145 250R145-RBZR Tape and Ammo 1200 ZR 250R145TU Bulk 500 U 250R145T 0.145 145 250R145TZR Tape and Ammo 1200 ZR 250R180F Bulk 200 F 250R180 0.180 180 250R180MR Tape and Ammo 1000 MR 250R180TF Bulk 200 F 250R180T 0.180 180 250R180TMR Tape and Ammo 1000 MR © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17

POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series Tape and Ammo Specifications Devices taped using EIA468-B/IE286-2 standards. See table below and Figure 1 for details. Dimensions Dimension EIA Mark IEC Mark Dim. (mm) Tol. (mm) Carrier tape width W W 18 –0.5 / +1.0 Hold down tape width W W 11 min. 4 0 Top distance between tape edges W W 3 max. 6 2 Sprocket hole position W W 9 –0.5 / +0.75 5 1 Sprocket hole diameter* D D 4 –0.32 / +0.2 0 0 Abscissa to plane (straight lead) H H 18.5 –/+ 3.0 Abscissa to plane (kinked lead) H H 16 –/+ 0.5 0 0 Abscissa to top H H 32.2 max. 1 1 Overall width without lead protrusion C 42.5 max. 1 Overall width with lead protrusion C 43.2 max. 2 Lead protrusion L l 1.0 max. 1 1 Protrusion of cut out L L 11 max. Protrusion beyond hold–down tape l l Not specified 2 2 Sprocket hole pitch: 250R080–250R145 P P 12.7 –/+ 0.3 0 0 Sprocket hole pitch: 250R180 P P 25.4 –/+ 0.5 0 0 20 Pitch tolerance –/+ 1 consecutive. Device pitch: 250R080–250R145 12.7 Device pitch: 250R180 25.4 Tape thickness t t 0.9 max. Tape thickness with splice t 2.0 max. 1 Splice sprocket hole alignment 0 –/+ 0.3 Body lateral deviation Δh Δh 0 –/+ 1.0 Body tape plane deviation Δp Δp 0 –/+ 1.3 Ordinate to adjacent component lead* P P 3.81 –/+ 0.7 1 1 Lead spacing F F 5.1 –/+ 0.7 *Differs from EIA Specification Tape and Ammo Diagram ∆h ∆h Figure 1 ∆h ∆p Reference plane A H1 1 F H1 C1 H C 2 H L A B 0W W 5 4 W I 2 L1 P0 D0 Direction of unreeling Cross section A - B t © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17 Reel Upper side Tape Direction of unreeling Lower side w 1 Cross section w Optional shape: Circular or polygonal 2