250R_06 LITTELFUSE | Alldatasheet

Document overview

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Technical content

Features

Applications

  • RoHS compliant and lead-free
  • Fast time-to-trip
  • Binned and sorted narrow resistance ranges available
  • 0.08 – 0.18 Hold current range, 60VDC operating voltage
  • 250VAC interrupt rating
  • Customer Premises Equipment (CPE)
  • Central Office (CO)/ Telecom Centers
  • LAN/WAN Equipment
  • Access equipment 250R Series Agency Approvals AGENCY AGENCY FILE NUMBER E183209 R50082521

www.littelfuse.com ©2006 Littelfuse 250R Series Specifications are subject to change without notice. Electronics Designers Guide POLYFUSE® Resettable PTCs Radial Leaded Ambient Operation Temperature -40°C -20°C 0°C 23°C 40°C 50°C 60°C 70°C 85°C Part Number Hold Current (A) Temperature Rerating Temperature Rerating Curve -40 -30 -20 -10 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 10% 30% 50% 70% 90% 110% 130% 150% 170% Temperature (°C) Percentage of Rated Current Average Time Current Curves CURRENT IN AMPERES TIME IN SECONDS 0.001 0.010 0.100 100 1000 10000 100000 0.100 1 10 1000.02 0.080A 0.120A 0.145A 0.180A 250R Series Specifications are subject to change without notice. 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.

www.littelfuse.com ©2006 Littelfuse 250R Series Specifications are subject to change without notice. Electronics Designers Guide POLYFUSE® Resettable PTCs Radial Leaded Protection Application Guide Region/Specification Application Device Selection South America/Asia/Europe ITU K.45 *Access network equipment Remote terminal Repeaters WAN equipment Cross –connect 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.21 Customer and IT equipment Analog modems ADSL, xDSL 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 T1/E1/J1 linecards ADSL/VDSL splitters CSU/DSU 250R180 250R180T 250R145 250R145T 250R120 250R120T North America Telcordia GR-974 *Primary protection modules MDF modules Network interface 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.20 North America Telcordia GR-1089 *Intrabuilding communication systems LAN, VOIP cards Local loop handsets 250R180 250R180T 250R145 250R145T 250R120 250R120T South America/Asia/Europe ITU K.20 and K.21 LAN Intrabuilding power cross Protection LAN equipment, IP phone 250R080 *Resistance binned parts are recommended 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 – 230Vac, 10Ω ITU K.20/21/45 – 600Vac, 600Ω 250R180 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 Telcordia GR – 974- 283Vac, 10A *Devices should be independently evaluated and tested for use in any specific application

www.littelfuse.com ©2006 Littelfuse 250R Series Specifications are subject to change without notice. Electronics Designers Guide POLYFUSE® Resettable PTCs Radial Leaded Environmental Specifications Operating/Storage Temperature -40°C to +85°C Maximum Device Surface Temperature in Tripped State 125°C Passive Aging 65°C/85°C, 1000 hours 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 Physical Specifications Lead Material Tin-plated copper Soldering Characteristics Solderability per MIL-STD-202, Method 208E Insulating Material Cured, flame retardant epoxy polymer meets UL94V-0 requirements. Device Labeling Marked with LF , voltage, current rating, and date code. Soldering Parameters - Solder Reflow Condition Reflow Peak Temp/ Duration Time 260°C > 5 Sec > 220°C 30 Sec ~ 60 Sec Preheat 160°C ~ 190°C 60 Sec ~ 90 Sec Storage Condition 0°C~35°C, < 70%RH

  • 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.
  • Devices can be cleaned using standard industry methods and solvents. Note: If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements. Preheating 160 190 220 260 30 to 60 Temperature (°C) Soldering Cooling 12060 to 90 Time(s) Soldering Parameters - Wave Soldering Condition Wave Soldering Peak Temp/ Duration Time 260°C < 5 Sec > 220°C 2 Sec ~ 20 Sec Preheat 140°C ~ 180°C 180 Sec ~ 210 Sec Storage Condition 0°C~35°C < 70%RH
  • 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.
  • Devices can be cleaned using standard industry methods and solvents.
  • This profile can be used for lead-free device Note: If soldering temperatures exceed the recommended 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)

www.littelfuse.com ©2006 Littelfuse 250R Series Specifications are subject to change without notice. Electronics Designers Guide POLYFUSE® Resettable PTCs Radial Leaded Part Numbering System PACKAGING STYLE R: RADIAL I HOLD CURRENT CODE (SEE TABLE BELOW)

250 R 120 - RA Z R

T: PRE-TRIPPED DEVICE (OPTIONAL) QUANTITY CODE: 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] Packaging I hold (A) I hold Code Packaging Option Quantity Quantity & Packaging Codes 0.080 080 Bulk 500 U Tape and Ammo 1500 DR 0.120 120 Bulk 500 U Tape and Ammo 1200 ZR 0.145 145 Bulk 500 U Tape and Ammo 1200 ZR 0.180 180 Bulk 200 F Tape and Ammo 1000 MR