SM104R1K

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 resistance values and tolerances • Point matched at specified temperatures • Tape and Reel Packaging Dimensions Features • High temperature capability to +220°C A • Surface mountable • Hermetically sealed TINNED DUMET CONTACT TABS C B • Low cost • Excellent long-term stability glass package GLASS BODY Part Numbering System SM 10 2 B 1 K Dimensions shown in inches. A 0.135” ± 0.012” B A B 0.135" 0.019" C C Series 0.060" Resistance @ 25ºC Base Value ± 0.005" 0.019” 0.060” ± 0.012" ± 0.005" ± 0.005” ± 0.005” Multiplier, power of 10 Resistance Tolerance F = ±1% K = ±10% No Significance R-T Curve Ex. 102 = 10 Ω x 102 = 1,000 Ω Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details. 0.135" 0.012" TINNED DUMET CONTACT TABS 0.060" 0.005" 0.019" 0.005" © 2018 Littelfuse, Inc. Revised: February 26, 2018 Specifications are subject to change without notice. GLASS BODY 1 littelfuse.com Surface Mount Thermistors MELF Style Thermistor LL 34 MiniMELF SM Specifications Beta (K) 0-50°C Dissipation Constant, Nominal (mW/°C) Thermal Time Constant, Max. Still Air (seconds) Temperature Rating (°C) -3.3 2941 2 8 -55 to +220 D2 _ 3156 2 8 -55 to +220 10 E -3.67 3263 2 8 -55 to +220 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 Part Number Resistance Ohms @25°C *Resistance Tol. ± % @ 25°C SM102B1K 1000 SM102D1K R-T Curve Temperature Coefficient (%/°C) @ 25°C 10 B 1000 10 SM102E1K 1000 SM202F1K *Resistance tolerances of ± 1%, 2%, and 5% are available upon request © 2018 Littelfuse, Inc. Revised: February 26, 2018 Specifications are subject to change without notice. 2 littelfuse.com Surface Mount Thermistors MELF Style Thermistor Specifications Beta (K) 0-50°C Dissipation Constant, Nominal (mW/°C) Thermal Time Constant, Max. Still Air (seconds) Temperature Rating (°C) -4.4 3892 2 8 -55 to +220 R -4.68 4140 2 8 -55 to +220 10 F -3.86 3419 2 8 -55 to +220 100000 10 J -4.4 3892 2 8 -55 to +220 SM504R1K 100000 10 R -4.68 4140 2 8 -55 to +220 SM254R1K 250000 10 R -4.68 4140 2 8 -55 to +220 SM105V3K 1000000 10 V3 -4.93 4369 2 8 -55 to +220 SM105R1K 1000000 10 R -4.68 4140 2 8 -55 to +220 R-T Curve Temperature Coefficient (% / °C) @ 25°C _ J 100000 10 SM502F1K 100000 SM503J1K Part Number Resistance Ohms @25°C *Resistance Tol. ± % @ 25°C SM104J1O 100000 SM104R1K *Resistance tolerances of ± 1%, 2%, and 5% are available upon request Packaging Packaging Option Packaging Code Standard Quantity Standard Tape and Reel -TR 2500 EIA-481 Disclaimer Notice - 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 © 2018 Littelfuse, Inc. Revised: February 26, 2018 Specifications are subject to change without notice. 3 littelfuse.com