Surface Mount Thermistors MELF Style Thermistor LL 34 MiniMELF WM Description Littelfuse LL-34 MiniMELF style interchangeable 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. They are well suited for uses where their interchangeability eliminates the necessity for costly individual circuit calibration. 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 A capability to +220C Excellent long-term Surface mountable stability TINNED DUMET Hermetically sealed CONTACT glass package TABS C B GLASS BODY Part Numbering System A B C WM 10 3 J 1 A Dimensions shown in inches. 0.060 0.135 0.019 0.005 A B C 0.012 0.005 Series Resistance Tolerance 0.135 0.019 0.060 Resistance 25C No Significance 0.012 0.005 0.005 Base Value R-T Curve Multiplier, power of 10 0.135 3 Ex. 103 = 10 x 10 = 10,000 0.012 TINNED Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details. 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 WM Specifications Thermal Temperature Dissipation Resistance Accuracy Time Temperature Part Coefficient Beta (K) Constant, Ohms (0 C to Constant, Rating Number (% / C) 0-50C Nominal 25C +100 C) Max. - Still Air (C) 25C (mW/C) (seconds) WM103J1A 10000 1.0 C -4.4 3892 2 8 -55 to +220 WM103J1B 10000 1.0 C -4.4 3892 2 8 -55 to +220 WM153J1A 15000 1.0 C -4.4 3892 2 8 -55 to +220 WM203J1A 20000 1.0 C -4.4 3892 2 8 -55 to +220 WM503J1A 50000 1.0 C -4.4 3892 2 8 -55 to +220 WM104J1A 100000 1.0 C -4.4 3892 2 8 -55 to +220 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 2 littelfuse.com Specifications are subject to change without notice.