0438.250WRA Littelfuse

Surface Mount Fuses Ceramic Fuse > 438A Series RoHS Pb 438A Series 0603 Fast-Acting Fuse Description The 438A series AECQ-compliant fuses are specifically tested to cater secondary circuit protection needs of compact auto electronics application. The general design ensures excellent temperature stability and performance reliability. The high It values which is typical in the Littelfuse ceramic fuse family ensure high inrush current withstand capability. Features Operating Temperature Meets Littelfuse s from -55C to +150C Automotive qualifications* 100% Lead-free, RoHS Recognized to UL/CSA/ Agency Approvals compliant and Halogen- NMX 248-1 and UL/CSA/ free NMX 248-14 Agency Agency File Number Ampere Range Suitable for both leaded and lead-free reflow/wave E10480 0.25A 6A soldering 29862 0.25A 6A * Largely based on Littelfuse internal AECQ-200 test plan. Applications Li-ion Battery TFT Display Electrical Characteristics for Series LED Head-Lights Battery Management System (BMS) % of Ampere Automotive Navigation Ampere Rating Opening Time at 25C Rating System Clusters 100% 0.250A 6A 4 Hours, Minimum Additional Information 250% 0.250A 6A 5 Seconds, Maximum Datasheet Resources Samples Electrical Specifications by Item Agency Approvals Ampere Max. Nominal Nominal Nominal Voltage Nominal Power Amp Interrupting Rating 2 Rating Voltage Resistance Melting I t Drop At Rated Dissipation At Rated 1 Code (AC/DC) 2 2 3 4 (A) Rating (V) (Ohms) (A Sec.) Current (V) Current (W) 0.25 .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 0.5 .500 63VDC 0.829 0.0100 0.486 0.243 x x 50A 63VDC 50A 32VAC 0.75 .750 63VDC 0.466 0.0281 0.378 0.284 x x 1 001. 63VDC 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 1.75 1.75 32VDC 50A 32VAC/32VDC 0.1405 0.1440 0.360 0.540 x x 2 002. 32 0.0490 0.181 0.107 0.214 x x 2.5 02.5 32 0.0364 0.240 0.095 0.238 x x 3 003. 32 0.0264 0.439 0.093 0.279 x x 50A 32VDC/12VAC 3.5 03.5 32 0.0210 0.647 0.082 0.287 x x 4 004. 32 0.0177 0.730 0.079 0.316 x x 5 005. 32 0.0127 0.747 0.074 0.370 x x 6 006. 24 50A 24VDC/12VAC 0.0086 1.444 0.072 0.432 x x Notes: 4. Nominal Voltage Drop measured at rated current after temperature has stabilized. 1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated voltage with time constant < 0.8 msec. continuously at no more than 80% rated current. See Temperature Re-rating Curvefor additional re-rating 2. Nominal Resistance measured with < 10% rated current. information. 3. Nominal Melting It measured at 1 msec. opening time. Devices designed to be mounted with marking code facing up. 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/11/19Surface Mount Fuses Ceramic Fuse > 438A Series Temperature Re-rating Curve Average Time Current Curves 140 100 120 100 10 80 60 1 40 -65 -45 -25 -5 15 35 55 75 95 115 135 155 TEMPERATURE (C) 0.1 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 1 0.1 10 100 CURRENT IN AMPERES Soldering Parameters Reflow Condition Pb free assembly t P - Temperature Min (T ) 150C s(min) T P Critical Zone Pre Heat - Temperature Max (T ) 200C Ramp-up s(max) T to T L P - Time (Min to Max) (t ) 60 180 seconds s T L t L Average Ramp-up Rate (Liquidus Temp (T ) to peak) 3C/second max. L T S(max) T to T - Ramp-up Rate 5C/second max. S(max) L Ramp-down - Temperature (T ) (Liquidus) 217C L Preheat Reflow T S(min) - Temperature (t ) 60 150 seconds L t S +0/-5 Peak Temperature (T ) 260 C P Time within 5C of actual peak Temperature (t ) 10 30 seconds p 25 time to peak temperature Ramp-down Rate 6C/second max. Time (t 25C to peak) Time 25C to peak Temperature (T ) 8 minutes max. P Do not exceed 260C Wave Soldering 260C, 10 seconds max. 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/11/19 PERCENT OF RATING TIME IN SECONDS .250A .375A .500A .750A 1A 1.25A 1.75A 2A 2.5A 3A 3.5A 4A 5A 6A Temperature