0440.250WR LITTELFUSE | Alldatasheet

Document overview

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Technical content

Features

Electrical Characteristics for Series

  • Operating Temperature from -55ºC to +150ºC
  • 100% Lead-free, RoHS compliant and Halogen- free
  • Suitable for both leaded and lead-free reflow / wave soldering
  • Ultra high I 2t values % of Ampere rating Ampere rating Opening Time at 25ºc 100% 0.25A - 8A 4 hours, Minimum 350% 0.25A - 8A 5 secs., Maximum

Applications

(A) Amp code max. Voltage rating (V) interrupting rating (Ac/Dc)1 nominal resistance (Ohms)2 nominal melting i2t (A2Sec.)3 nominal Voltage Drop At rated current (V)4 nominal power Dissipation At rated current (W) Agency Approvals 1 0 01. 50

50 A @ 50 V DC

50 A @ 50 V AC

0.3096 0.21054 0.3457 0.346 x X 1 .75 1 .75 32

50 A @ 32 V AC/DC

0.04518 0.3312 0.0777 0.136 x X Electrical Specifications by Item Notes: 1 . AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated voltage with time constant < 0.8 msec. 2. Nominal Resistance measured with < 10% rated current. 3. Nominal Melting I²t measured at 1 msec. opening time. 4. Nominal Voltage Drop measured at rated current after temperature has stabilized.

  • Automotive Electronics
  • LCD Displays
  • Servers
  • Notebook Computers
  • Printers
  • Scanners
  • Data Modems
  • Hard Disk Drives Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated continuously at no more than 80% rated current. See “Temperature Derating Curve”for additional derating information. Devices designed to be mounted with marking code facing up. Revised: June 23, 2011

Introduction to Circuit ProtectionIntroduction to Circuit Protection Transientology 2 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Surface Mount Fuses Please refer to www.littelfuse.com/series/440.html for current information.

440 Series

Ceramic Fuse > 440 Series Average Time Current Curves 0.001 0.01 0.1 100 TIME IN SECONDS CURRENT IN AMPERES reflow condition Pb-free assembly pre Heat - Temperature min (Ts(min)) 150°C - Temperature max (Ts(max)) 200°C - Time (min to max) (ts) 60 – 180 seconds Average ramp-up rate (liquidus Temp (Tl) to peak) 3°C/second max. TS(max) to Tl - ramp-up rate 5°C/second max. reflow - Temperature (Tl) (liquidus) 217°C - Temperature (tl) 60 – 150 seconds peak Temperature (Tp) 260+0/-5 °C Time within 5°c of actual peak Temperature (tp) 10 – 30 seconds ramp-down rate 6°C/second max. Time 25°c to peak Temperature (Tp) 8 minutes max. Do not exceed 260°C Soldering Parameters T emperature Derating Curve 100 120 140 -65 -45 -25 -5 15 35 55 75 95 115 135 155 TEMPERATURE (°C) PERCENT OF RATING Time Te mperature TP TL TS(max) TS(min) tP tL tS time to peak temperature (t 25ºC to peak) Ramp-down Ramp-up Preheat Critical Zone TL to TP Example: For continuous operation at 75 degrees celsius, the fuse should be derated as follows: I = (0.80)(0.85)IRAT = (0.68)IRAT Note: 1 . Derating depicted in this curve is in addition to the standard derating of 20% for continuous operation. Wave Soldering 260°C, 10 seconds max.

3© 2009 Littelfuse, Inc. Specifications are subject to change without notice. Surface Mount Fuses Please refer to www.littelfuse.com/series/440.html for current information. Ceramic Fuse > 440 Series Body: Advanced Ceramic T erminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass Moisture Sensitivity Level IPC/JEDEC J-STD-020C, Level 1 Solderability IPC/ECA/JEDEC J-STD-002B, Condition C Humidity T est MIL-STD-202, Method 103B, Conditions D Resistance to Solder Heat MIL-STD-202, Method 210F, Condition B Product Characteristics Moisture Resistance MIL -STD-202, Method 106G Thermal Shock MIL -STD-202, Method 107G, Condition B Mechanical Shock MIL-STD-202, Method 213B, Condition A Vibration MIL -STD-202, Method 201A Vibration, High Frequency MIL -STD-202, Method 204D, Condition D Dissolution of Metallization IPC/ECA/JEDEC J-STD-002C, Condition D T erminal Strength IEC 60127-4 Dimensions 3.200 ± .1778 [.126 ± .007] 1.000 [.039] X 1.500 [.059] 1.800 [.071] 3.500 [.138] 1.000 [.039] .8179 +.046/ -.076 0.520 ± .200 [.020 ± .008] TERMINATION 1.63 + .10/ -.20 Packaging Part Marking System packaging Option packaging Specification Quantity Quantity & packaging code 8mm Tape and Reel EIA-481, IEC 60286, Part 3 3000 WR Part Numbering System 0440 008. W R SERIES AMP CoDE quANTITy CoDE W = 3000 pcs PACkINg CoDE R = Reel Pack Amp code marking code .250 D .375 E .500 F .750 g 0 01. H 1 .25 J 01 .5 k 1 .75 L 002. N 02.5 o 003. P 03.5 R 004. S 005. T 007 . W 008. X