SM303J1K Littelfuse

Surface Mount Thermistors MELF Style Thermistor LL 34 MiniMELF SM Description Littelfuse LL-34 MiniMELF style glass encapsulated surface mount thermistors are manufactured using super stable NTC chips which are hermetically sealed in a glass package. The result is a device which exhibits excellent long-term reliability and stability even when subjected to severe environmental or thermal conditions. Their uniform dimensions make them especially suitable for use with automatic insertion equipment. Options Non-standard Point matched at resistance values specified temperatures and tolerances Tape and Reel Packaging Dimensions Features High temperature Low cost capability to +220C Excellent long-term A Surface mountable stability TINNED Hermetically sealed DUMET glass package CONTACT TABS C B GLASS BODY Part Numbering System SM 1 0 2 B 1 K Dimensions shown in inches. Series Resistance Tolerance A B C A B C F = 1% K = 10% 0.060 Resistance 25C 0.135 0.019 0.135 0.019 0.060 0.005 0.012 0.005 Base Value No Significance 0.012 0.005 0.005 Multiplier, power of 10 R-T Curve 2 Ex. 102 = 10 x 10 = 1,000 Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details. 0.135 0.012 TINNED DUMET CONTACT TABS GLASS 0.060 BODY 0.005 0.019 0.005 2018 Littelfuse, Inc. Revised: February 26, 2018 1 littelfuse.com Specifications are subject to change without notice. Surface Mount Thermistors MELF Style Thermistor LL 34 MiniMELF SM Specifications Thermal Time Dissipation Resistance *Resistance Temperature Constant, Temperature Part R-T Beta (K) Constant, Ohms Tol. % Coefficient Max. - Rating Number Curve 0-50C Nominal 25C 25C (%/C) 25C Still Air (C) (mW/C) (seconds) SM102B1K 1000 10 B -3.3 2941 2 8 -55 to +220 SM102D1K 1000 10 D2 3156 2 8 -55 to +220 SM102E1K 1000 10 E -3.67 3263 2 8 -55 to +220 SM202F1K 2000 10 F -3.86 3419 2 8 -55 to +220 SM222E1K 2186 10 E1 -3.82 3320 2 8 -55 to +220 SM252B1K 2500 10 B -3.31 2941 2 8 -55 to +220 SM252B4K 2500 10 B -3.31 2941 2 8 -55 to +220 SM103F5K 10000 10 F -3.86 3419 2 8 -55 to +220 SM103G1K 10000 10 G -4.04 3575 2 8 -55 to +220 SM103J1F 10000 1 J -4.4 3892 2 8 -55 to +220 SM103J1K 10000 10 J -4.4 3892 2 8 -55 to +220 SM403J1K 10000 10 J -4.4 3892 2 8 -55 to +220 SM472F1K 10000 10 F -3.86 3419 2 8 -55 to +220 SM472G1K 10000 10 G -4.03 3575 2 8 -55 to +220 SM501B1K 10000 10 B -3.31 2941 2 8 -55 to +220 SM153J1K 15000 10 J -4.4 3892 2 8 -55 to +220 SM602F1K 15000 10 F -3.86 3419 2 8 -55 to +220 SM203J1K 20000 10 J -4.4 3892 2 8 -55 to +220 SM253J1K 25000 10 J -4.4 3892 2 8 -55 to +220 SM303J1K 30000 10 J -4.4 3892 2 8 -55 to +220 SM104J1F 100000 1 J -4.4 3892 2 8 -55 to +220 SM104J1K 100000 10 J -4.4 3892 2 8 -55 to +220 *Resistance tolerances of 1%, 2%, and 5% are available upon request 2018 Littelfuse, Inc. Revised: February 26, 2018 2 littelfuse.com Specifications are subject to change without notice.