0438001.WR 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 % of Ampere Rating Ampere Rating Opening Time at 25ºC 100% 0.250A – 6A 4 Hours, Minimum 250% 0.250A – 6A 5 Seconds, Maximum

Applications

(A) Amp Code Max. Voltage Rating (V) Interrupting Rating 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 0.25 .250 63 50A @ 63VDC 50A @ 32VAC 2.024 0.0017 0.550 0.138 x x 2 002. 32 50A @ 32VDC/12VAC 0.051 0.1490 0.107 0.214 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.

  • Handheld Electronics
  • LCD Displays
  • Battery Packs
  • Hard Disk Drives
  • SD Memory Cards
  • Automotive Electronics 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 Rerating Curve”for additional rerating information. Devices designed to be mounted with marking code facing up. Revised: February 15, 2012

Introduction to Circuit Protection Introduction to Circuit Protection Transientology 2 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Surface Mount Fuses

438 Series

Ceramic Fuse > 438 Series Please refer to www.littelfuse.com/series/438.html for current information. Average Time Current Curves 0.001 0.01 0.1 100 .250A 3.5A 2.5A 1.75A 1.5A 1.25A .500A .375A .750A TIME IN SECONDS 0.1 1 10 100 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 Temperature Rerating Curve 100 120 140 -65 -45 -25 -5 15 35 55 75 95 115 135 155 TEMPERATURE (°C) PERCENT OF RATING Example: For continuous operation at 75 degrees celsius, the fuse should be rerated as follows: I = (0.80)(0.85)IRAT = (0.68)IRAT Note: 1. Rerating depicted in this curve is in addition to the standard rerating of 20% for continuous operation. Wave Soldering 260°C, 10 seconds max. Time Temperature 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

3© 2009 Littelfuse, Inc. Specifications are subject to change without notice. Surface Mount Fuses Ceramic Fuse > 438 Series Please refer to www.littelfuse.com/series/438.html for current information. Body: Advanced Ceramic Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass Moisture Sensitivity Level IPC/JEDEC J-STD-020C, Level 1 Solderability IPC/EIC/JEDEC J-STD-002B, Condition B Humidity 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-3 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/EIC/JEDEC J-STD-002B, Condition D Terminal Strength IEC 60127-4 Dimensions 1.54 ± 0.150 [0.061 ± 0.006] 0.74 [0.029] 1.00 [0.039] 1.94 [0.076] 0.60 [0.024] 0.502 ± 0.080 [0.020 ± 0.003] 0.530 +/- 0.150 [0.021 +/- 0.006] 0.85 ± 0.150 [0.033 ± 0.006] 0.432 +/- 0.150 [0.017 +/- 0.006] 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 0438 005. W R SERIES AMP CODE QUANTITY CODE PACKING CODE W = 3000 pcs R = Reel Pack Amp Code Marking Code .250 D .375 E .500 F .750 G 001. H 1.25 J 01.5 K 1.75 L 002. N 02.5 O 003. P 03.5 R 004. S 005. T 006. U