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range, 60VDC operating voltage t7"$JOUFSSVQUSBUJOH t'BTUUJNFoUPUSJQ t#JOOFEBOETPSUFEOBSSPX resistance ranges available t3P)4DPNQMJBOU -FBE 'SFFBOE)BMPHFO'SFF t$VTUPNFS1SFNJTFT Equipment (CPE) t$FOUSBM0GmDF $0 telecom centers t-"/8"/FRVJQNFOU t"DDFTTFRVJQNFOU 250R Series Agency Approvals AGENCY AGENCY FILE NUMBER E183209 R50120008 I hold )PMEDVSSFOUNBYJNVNDVSSFOUEFWJDFXJMMQBTTXJUIPVUUSJQQJOHJO¡$TUJMMBJS I trip 5SJQDVSSFOUNJOJNVNDVSSFOUBUXIJDIUIFEFWJDFXJMMUSJQJO¡$TUJMMBJS Vint .BYJNVNWPMUBHFUIFEFWJDFDBOXJUITUBOEXJUIPVUEBNBHFBUSBUFEDVSSFOU *NBY Vop= The device regular operation voltage I NBY .BYJNVNGBVMUDVSSFOUEFWJDFDBOXJUITUBOEXJUIPVUEBNBHFBUSBUFEWPMUBHF 7NBY) P d 1PXFSEJTTJQBUFEGSPNEFWJDFXIFOJOUIFUSJQQFETUBUFBU¡$TUJMMBJS R min = Minimum resistance of device in initial (un-soldered) state. R typ = Typical resistance of device in initial (un-soldered) state. R NBY .BYJNVNSFTJTUBODFPGEFWJDFBU¡$NFBTVSFEPOFIPVSBGUFSUSJQQJOH Caution: Operation beyond the specified rating may result in damage and possible arcing and flame. &GGFDUJWF+BOVBSZ BMM315$QSPEVDUTXJMMCFNBOVGBDUVSFE)BMPHFO'SFF )' &YJTUJOH/PO)BMPHFO'SFF315$QSPEVDUTNBZDPOUJOVFUPCFTPME VOUJMTVQQMJFTBSFEFQMFUFE

Revised: August 31, 2011 POL Y -FUSE® Resettable PTCs © 2011 Littelfuse, Inc.250R Series Radial Leaded > 250R Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/250R.html for current information. Ambient Operation Temperature Part Number Hold Current (A) T emperature Rerating T emperature Rerating Curve -40 -30 -20 -10 0 10 20 30 40 506 07 08 0 10% 30% 50% 70% 90% 110 % 130% 150% 170% Temperature (°C) Percentage of Rated Current Average Time Current Curves 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. 0.01 0.1 100 1000 10000 100000 0.080A 0.120A 0.145A 0.180A250R 0.1 1 10 100 Current in Amperes Time in Seconds

Revised: August 31, 2011 POL Y -FUSE® Resettable PTCs © 2011 Littelfuse, Inc 250R Series Radial Leaded > 250R Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/250R.html for current information. 250R Series Protection Application Guide Region/Specification Application Device Selection South America/Asia/Europe ITU K.45 "DDFTTOFUXPSLFRVJQNFOU Remote terminal Repeaters 8"/FRVJQNFOU $SPTToDPOOFDU 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.21 Customer and IT equipment Analog modems "%4- Y%4- Phone sets, PBX systems Internet appliances POS terminals 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.20 Central Office POTS/ISDN linecards 5&+MJOFDBSET "%4-7%4-TQMJUUFST CSU/DSU 250R180 250R180T 250R145 250R145T 250R120 250R120T North America Telcordia GR-97 4 1SJNBSZQSPUFDUJPONPEVMFT MDF modules Network interface 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.20 North America Telcordia GR-1089 *OUSBCVJMEJOHDPNNVOJDBUJPOTZTUFNT -"/ 70*1DBSET -PDBMMPPQIBOETFUT 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.20 and K.21 -"/*OUSBCVJMEJOHQPXFSDSPTT Protection -"/FRVJQNFOU *1QIPOF 250R080 3FTJTUBODFCJOOFEQBSUTBSFSFDPNNFOEFE Agency Specification Selection Guide For T elecom and Networking Applications Product Lightning Power Cross 250R120 250R145 *56,oL7çT *56,oL7çT *56,o7BD û *56,o7BD û 250R180 *56,oL7çT *56,oL7çT 5FMDPSEJB(3ooL7çT *56,o7BD û *56,o7BD û 5FMDPSEJB(3o7BD %FWJDFTTIPVMECFJOEFQFOEFOUMZFWBMVBUFEBOEUFTUFEGPSVTFJOBOZTQFDJmDBQQMJDBUJPO

Revised: August 31, 2011 POL Y -FUSE® Resettable PTCs © 2011 Littelfuse, Inc.250R Series Radial Leaded > 250R Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/250R.html for current information. Environmental Specifications Operating/Storage T emperature ¡$UP Maximum Device Surface T emperature in T ripped State ¡$ Passive Aging ¡$¡$ IPVST Humidity Aging IPVST Thermal Shock .*-o45%o' .FUIPE( ¡$UP¡$UJNFT Solvent Resistance .*-o45%o .FUIPE' Moisture Sesitivity Level -FWFM +o45%o$ Physical Specifications Lead Material Tin-plated Copper Soldering Characteristics 4PMEFSBCJMJUZQFS.*-o45%o Method 208E Insulating Material $VSFE nBNFSFUBSEBOUFQPYZQPMZNFS NFFUT6-7SFRVJSFNFOUT Device Labeling .BSLFEXJUIh-'h WPMUBHF DVSSFOUSBUJOH and date code. Soldering Parameters - Wave Soldering Condition 8BWF4PMEFSJOH Peak Temp/ Duration Time ¡$< 5 Sec > 220°C 2 Sec ~ 20 Sec Preheat 140°C ~ 180°C 180 Sec ~ 210 Sec t3FDPNNFOEFETPMEFSJOHNFUIPETIFBUFMFNFOUPWFOPS N2 environment for lead-free. t%FWJDFTBSFEFTJHOFEUPCFXBWFTPMEFSFEUPUIFCPUUPN side of the board. t%FWJDFTDBOCFDMFBOFEVTJOHTUBOEBSEJOEVTUSZNFUIPET and solvents. t5IJTQSPmMFDBOCFVTFEGPSMFBEGSFFEFWJDF Note:*GTPMEFSJOHUFNQFSBUVSFTFYDFFEUIFSFDPNNFOEFE profile, devices may not meet the performance requirements. Preheating 160 190 220 260 2 to 5 Temperature (°C) Soldering Cooling 20-30180 to 210 Time(s)

Revised: August 31, 2011 POL Y -FUSE® Resettable PTCs © 2011 Littelfuse, Inc 250R Series Radial Leaded > 250R Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/250R.html for current information. 250R Series Part Marking System 250 080 XXXX Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information) Littelfuse Trademark Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information) Littelfuse Trademark 250 120 XXXX Dimensions BB C AA E D C E D F F Figure 2Figure 1 Part Number Figure A B C D E Physical Characteristics Inches mm Inches mm Inches mm Inches mm Inches mm Lead (dia) Material

Revised: August 31, 2011 POL Y -FUSE® Resettable PTCs © 2011 Littelfuse, Inc.250R Series Radial Leaded > 250R Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/250R.html for current information. Part Ordering Number System PACKAGING STYLE R: RADIAL I HOLD CURRENT CODE

250 R 120 - RA Z R

T: PRE-TRIPPED DEVICE (OPTIONAL) QUANTITY CODE: F=200 M=1000 U=500 Z=1200 SERIES PEAK VOLTAGE RATING BLANK: Bulk R: Tape & Ammo Rx: Resistance Range (x = A-Z or 1-9) [not applicable for all parts] (Refer to Packaging or Electrical Characteristics tables) Packaging Part Number Ordering Number I hold (A) I hold Code Packaging Option Quantity Quantity & Packaging Codes 250R080 250R080U 0.080 080 Bulk 500 U 250R080ZR Tape and Ammo 1200 ZR 250R080T 250R080TU 0.080 080 Bulk 500 U 250R080TZR Tape and Ammo 1200 ZR 250R120 250R120U 0.120 120 Bulk 500 U 250R120ZR Tape and Ammo 1200 ZR 250R120-RA 250R120-RAU 0.120 120 Bulk 500 U 250R120-RAZR Tape and Ammo 1200 ZR 250R120-RC 250R120-RCU 0.120 120 Bulk 500 U 250R120-RCZR Tape and Ammo 1200 ZR 250R120-RF 250R120-RFU 0.120 120 Bulk 500 U 250R120-RFZR Tape and Ammo 1200 ZR 250R120-R1 250R120-R1U 0.120 120 Bulk 500 U 250R120-R1ZR Tape and Ammo 1200 ZR 250R120-R2 250R120-R2U 0.120 120 Bulk 500 U 250R120-R2ZR Tape and Ammo 1200 ZR 250R120-R3 250R120-R3U 0.120 120 Bulk 500 U 250R120-R3ZR Tape and Ammo 1200 ZR 250R120T 250R120TU 0.120 120 Bulk 500 U 250R120TZR Tape and Ammo 1200 ZR 250R145 250R145U 0.145 145 Bulk 500 U 250R145ZR Tape and Ammo 1200 ZR 250R145-RA 250R145-RAU 0.145 145 Bulk 500 U 250R145-RAZR Tape and Ammo 1200 ZR 250R145-RB 250R145-RBU 0.145 145 Bulk 500 U 250R145-RBZR Tape and Ammo 1200 ZR 250R145T 250R145TU 0.145 145 Bulk 500 U 250R145TZR Tape and Ammo 1200 ZR 250R180 250R180F 0.180 180 Bulk 200 F 250R180MR Tape and Ammo 1000 MR 250R180T 250R180TF 0.180 180 Bulk 200 F 250R180TMR Tape and Ammo 1000 MR

Revised: August 31, 2011 POL Y -FUSE® Resettable PTCs © 2011 Littelfuse, Inc 250R Series Radial Leaded > 250R Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/250R.html for current information. 250R Series Dimension EIA Mark IEC Mark Dimensions Dim. (mm) T ol. (mm) Carrier tape width WW 18 o )PMEEPXOUBQFXJEUI W4 W0 11 min. Top distance between tape edges W6 W2 3 NBY Sprocket hole position W5 W1 9 o 4QSPDLFUIPMFEJBNFUFS D0 D0 4 o Abscissa to plane (straight lead) HH 18.5 o Abscissa to plane (kinked lead) H0 H0 16 o Abscissa to top H1 H1 32.2 NBY Overall width without lead protrusion C1 42.5 NBY Overall width with lead protrusion C2 43.2 NBY -FBEQSPUSVTJPO L1 l1 1. 0 NBY Protrusion of cut out LL 11 NBY 1SPUSVTJPOCFZPOEIPMEoEPXOUBQF l2 l2 Not specified 4QSPDLFUIPMFQJUDI3o3 P0 P0 12.7 o 4QSPDLFUIPMFQJUDI3 P0 P0 25.4 o Pitch tolerance 20 consecutive. o %FWJDFQJUDI3o3 12.7 %FWJDFQJUDI3 25.4 Tape thickness tt 0.9 NBY Tape thickness with splice t1 2.0 NBY Splice sprocket hole alignment 0 o Body lateral deviation Δh Δh 0 o Body tape plane deviation Δp Δp 0 o 0SEJOBUFUPBEKBDFOUDPNQPOFOUMFBE P1 P1 3.81 o -FBETQBDJOH FF 5.1 o %JGGFSTGSPN&*"4QFDJGJDBUJPO T ape and Ammo Specifications Devices taped using EIA468-B/IE286-2 standards. See table below and Figure 1 for details. T ape and Ammo Diagram A B L1 P0 D0 F L W Reference plane Δh Δh H Δh Δp Direction of unreeling Cross section A - B t Figure 1