Surface Mount Fuses Ceramic Fuse > 438 Series 438 Series – 0603 Fast-Acting Fuse RoHS Pb Description The 438 Series is a 100% Lead-free, RoHS compliant and Halogen-free fuse series designed specifically to provide over-current protection to circuits that operate under high working ambient temperature up to 150ºC. The general design ensures excellent temperature stability and performance reliability. The high I²t values which is typical in the Littelfuse Ceramic Fuse family ensure high inrush current withstand capability. Features • Operating Temperature from -55ºC to +150ºC Agency Approvals AGENCY AGENCY FILE NUMBER AMPERE RANGE E10480 0.250A – 6A 29862 0.250A – 6A Ampere Rating Applications • Handheld Electronics • Hard Disk Drives • LCD Displays • SD Memory Cards • Battery Packs Electrical Characteristics for Series % of Ampere Rating • 100% Lead-free, RoHS compliant and Halogenfree • Suitable for both leaded and lead-free reflow / wave soldering Opening Time at 25ºC 100% 0.250A – 6A 4 Hours, Minimum 250% 0.250A – 6A 5 Seconds, Maximum Additional Information Datasheet Resources Samples Electrical Specifications by Item Ampere Max. Amp Rating Voltage Code (A) Rating (V) 0.25 0.375 0.5 0.75 1 1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 .250 .375 .500 .750 001. 1.25 01.5 1.75 002. 02.5 003. 03.5 004. 005. 006. 63VDC 63VDC 63VDC 63VDC 63VDC 63VDC 63VDC 63VDC 32 32 32 32 32 32 24 Interrupting Rating 50A @ 63VDC 50A @ 32VAC 50A @ 32VDC/12VAC 50A @ 24VDC/12VAC Nominal Nominal Voltage Nominal Power Agency Approvals Nominal Drop At Rated Dissipation At Resistance Melting I2t (A2Sec.)3 Current (V)4 Rated Current (W) (Ohms)2 2.218 1.247 0.829 0.466 0.310 0.200 0.174 1.405 0.051 0.0324 0.0255 0.0205 0.0170 0.0115 0.0085 0.0017 0.0041 0.0100 0.0281 0.0593 0.0510 0.0902 0.1440 0.1490 0.1977 0.2922 0.4752 0.6920 0.7398 1.3838 0.550 0.488 0.486 0.378 0.351 0.365 0.368 0.360 0.107 0.095 0.093 0.082 0.079 0.074 0.072 0.138 0.183 0.243 0.284 0.351 0.456 0.552 0.540 0.214 0.238 0.279 0.287 0.316 0.370 0.432 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 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. 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 Re-rating Curve”for additional re-rating information. Devices designed to be mounted with marking code facing up. 4.Nominal Voltage Drop measured at rated current after temperature has stabilized. © 2015 Littelfuse, Inc. Specifications are subject change recommended. without notice. Specifications are subject to change without notice. Application testing istostrongly Revised: 05/25/15 Surface Mount Fuses Ceramic Fuse > 438 Series 120 100 10 80 60 40 -65 -45 -25 -5 15 35 55 75 95 115 135 155 TEMPERATURE (°C) TIME IN SECONDS PERCENT OF RATING 100 .750A 1A 1.25A 1.5A 1.75A 2A 2.5A 3A 3.5A 4A 5A 6A 140 .250A Average Time Current Curves .375A .500A Temperature Re-rating Curve 1 0.1 Note: 1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for continuous operation. 0.01 Example: For continuous operation at 75 degrees celsius, the fuse should be rerated as follows: I = (0.80)(0.85)IRAT = (0.68)IRAT 0.001 0.1 1 10 100 CURRENT IN AMPERES Soldering Parameters 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 Wave Soldering 260°C, 10 seconds max. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/25/15 tP TP Critical Zone TL to TP Ramp-up TL TS(max) Temperature Reflow Condition tL Ramp-down TS(min) 25 Preheat tS time to peak temperature (t 25ºC to peak) Time Surface Mount Fuses Ceramic Fuse > 438 Series Product Characteristics Body: Advanced Ceramic Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass Materials Moisture IPC/JEDEC J-STD-020, Level 1 Sensitivity Level Solderability IPC/EIC/JEDEC J-STD-002, Condition B Humidity MIL-STD-202, Method 103, Conditions D Resistance to Solder Heat MIL-STD-202, Method 210, Condition B Dimensions Moisture Resistance MIL-STD-202, Method 106 Thermal Shock MIL-STD-202, Method 107, Condition B-3 Mechanical Shock MIL-STD-202, Method 213, Condition A Vibration MIL-STD-202, Method 201 Vibration, High Frequency MIL-STD-202, Method 204, Condition D Dissolution of Metallization IPC/EIC/JEDEC J-STD-002, Condition D Terminal Strength IEC 60127-4 Part Marking System 0.530 +/- 0.150 [0.021 +/- 0.006] 1.54 ± 0.150 [0.061 ± 0.006] Amp Code Marking Code .250 D .375 E 0.85 ± 0.150 [0.033 ± 0.006] 0.502 ± 0.080 [0.020 ± 0.003] 0.432 +/- 0.150 [0.017 +/- 0.006] 0.60 [0.024] 0.74 [0.029] .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 Part Numbering System 0438 005. W R SERIES 1.00 [0.039] PACKING CODE R = Reel Pack AMP CODE 1.94 [0.076] QUANTITY CODE W = 3000 pcs Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code 8mm Tape and Reel EIA-481, IEC 60286, Part 3 3000 WR © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/25/15