Surface Mount Fuses Ceramic Fuse > 438 Series 438 Series – 0603 Fast-Acting Fuse RoHS Pb HF 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 • Suitable for both leaded Agency Approvals from -55ºC to +150ºC and lead-free reflow / wave soldering • 100% Lead-free, RoHS Agency Agency File Number Ampere Range compliant and Halogen- • Recognized to UL/CSA/ free NMX 248-1 and UL/CSA/ E10480 0.250A – 6A NMX 248-14 29862 0.250A – 6A Applications • Handheld Electronics • Hard Disk Drives • LCD Displays • SD Memory Cards Electrical Characteristics for Series • Battery Packs % of Ampere Ampere Rating Opening Time at 25ºC Additional Information Rating 100% 0.25A – 6A 4 Hours, Minimum 250% 0.25A – 6A 5 Seconds, Maximum Datasheet Resources Samples Electrical Specifications by Item Ampere Max. Nominal Nominal Nominal Voltage Nominal Power Agency Approvals Amp Rating Voltage Interrupting Rating Resistance Melting I2t Drop At Rated Dissipation At Rated Code (A) Rating (V) (Ohms)2 (A2Sec.)3 Current (V)4 Current (W) 0.250 .250 63VDC 2.218 0.0017 0.550 0.138 x x 0.375 .375 63VDC 1.247 0.0041 0.488 0.183 x x 0.500 .500 63VDC 0.829 0.0100 0.486 0.243 x x 0.750 .750 63VDC 50A @ 63VDC 0.466 0.0281 0.378 0.284 x x 1.00 001. 63VDC 50A @ 32VAC 0.310 0.0593 0.351 0.351 x x 1.25 1.25 63VDC 0.200 0.0510 0.365 0.456 x x 1.50 01.5 63VDC 0.174 0.0902 0.368 0.552 x x 1.75 1.75 63VDC 0.1405 0.1440 0.360 0.540 x x 2.00 002. 32 0.051 0.1490 0.107 0.214 x x 2.50 02.5 32 0.0324 0.1977 0.095 0.238 x x 3.00 003. 32 0.0255 0.2922 0.093 0.279 x x 50A @ 32VDC/12VAC 3.50 03.5 32 0.0205 0.4752 0.082 0.287 x x 4.00 004. 32 0.0170 0.6920 0.079 0.316 x x 5.00 005. 32 0.0115 0.7398 0.074 0.370 x x 6.00 006. 24 50A @ 24VDC/12VAC 0.0085 1.3838 0.072 0.432 x x Notes: 1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated 4. Nominal Voltage Drop measured at rated current after temperature has stabilized. voltage with time constant < 0.8 msec. Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated 2. Nominal Resistance measured with < 10% rated current. continuously at no more than 80% rated current. See “Temperature Re-rating Curve”for additional re-rating 3. Nominal Melting I²t measured at 1 msec. opening time. information. Devices designed to be mounted with marking code facing up. © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/11/19

Surface Mount Fuses Ceramic Fuse > 438 Series Temperature Re-rating Curve Average Time Current Curves 140 100 .250A .375A.500A .750A1A1.25A 1.5A 1.75A2A2.5A3A3.5A4A5A6A G120 N TI A R100 F O 10 T N80 E C R E P60 S ND 1 O 40 C E -65 -45 -25 -5 15 35 55 75 95 115 135 155 S N TEMPERATURE (°C) E I M 0.1 TI Note: 1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for continuous operation. Example: For continuous operation at 75 degrees celsius, the fuse should be rerated as follows: I = (0.80)(0.85)I = (0.68)I 0.01 RAT RAT 0.001 0.1 1 10 100 CURRENT IN AMPERES Soldering Parameters Reflow Condition Pb – free assembly t - Temperature Min (T ) 150°C P s(min) TP Pre Heat - Temperature Max (T ) 200°C Critical Zone s(max) Ramp-up TL to TP - Time (Min to Max) (t) 60 – 180 seconds s T TASv(mearxa) gtoe TRLa -m Rpa-mupp -Ruapt eR a(Lteiquidus Temp (TL) to peak) 35°°CC//sseeccoonndd mmaaxx.. eruTS(maxL) tL - Temperature (T) (Liquidus) 217°C ta Reflow - Temperature (tLL) 60 – 150 seconds repmT Preheat Ramp-down Peak Temperature (T) 260+0/-5 °C S(min) Time within 5°C of aPctual peak Temperature (t) 10 – 30 seconds eT tS p Ramp-down Rate 6°C/second max. Time 25°C to peak Temperature (T) 8 minutes max. 25 P time to peak temperature Do not exceed 260°C (t 25ºC to peak) Time Wave Soldering 260°C, 10 seconds max. © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/11/19

Surface Mount Fuses Ceramic Fuse > 438 Series Product Characteristics Body: Advanced Ceramic Moisture Resistance MIL-STD-202, Method 106 Materials Terminations: Ag / Ni / Sn (100% Lead-free) Thermal Shock MIL-STD-202, Method 107, Condition B-3 Element Cover Coating: Lead-free Glass Mechanical Shock MIL-STD-202, Method 213, Condition A Moisture Sensitivity Level IPC/JEDEC J-STD-020, Level 1 Vibration MIL-STD-202, Method 201 Solderability IPC/EIC/JEDEC J-STD-002, Condition B Vibration, High Frequency MIL-STD-202, Method 204, Condition D Humidity MIL-STD-202, Method 103, Conditions D Dissolution of Metallization IPC/EIC/JEDEC J-STD-002, Condition D Resistance to Solder Heat MIL-STD-202, Method 210, Condition B Terminal Strength IEC 60127-4 Dimensions Part Marking System Marking 0.530 +/- 0.150 1.54 ± 0.150 Amp Code Marking Code Amp Code Code [0.021 +/- 0.006] [0.061 ± 0.006] .250 D 002. N .375 E 02.5 O 0.85 ± 0.150 .500 F 003. P [0.033 ± 0.006] .750 G 03.5 R 001. H 004. S 1.25 J 005. T 01.5 K 006. U 1.75 L 0.502 ± 0.080 [0.020 ± 0.003] Part Numbering System 0438 005. W R SERIES PACKING CODE 0.432 +/- 0.150 AMP CODE R = Reel Pack [0.017 +/- 0.006] 0.60 0.74 QUANTITY CODE [0.024] [0.029] W = 3000 pcs Packaging 1.00 [0.039] Packaging Packaging Quantity & Quantity Option Specification Packaging Code 8mm Tape and EIA-481, IEC 60286, 3000 WR 1.94 Reel Part 3 [0.076] Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics. © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/11/19