LTO 30 www.vishay.com Vishay Sfernice 30 W Power Resistor Thick Film Technology FEATURES * 30 W at 25 C case temperature heatsink mounted * Direct mounting ceramic on heatsink * Broad resistance range: 0.010 to 550 k * Non inductive * TO-220 package: compact and easy to mount DESIGN SUPPORT TOOLS * Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 click logo to get started Models Available LTO series are the extension of RTO types. We used the direct ceramic mounting design (no metal tab) of our RCH power resistors applied to semiconductor packages. DIMENSIONS in millimeters 3.2 10.4 3.2 16.2 O 3.2 1.3 3.5 12.7 0.8 0.6 1.8 5.08 Note * Tolerances unless stated: 0.3 mm STANDARD ELECTRICAL SPECIFICATIONS MODEL SIZE RESISTANCE RANGE LTO 30 TO-220 0.010 to 550K TEMPERATURE COEFFICIENT ppm/C CRITICAL RESISTANCE 150, 250, 700, 900 8.33K RATED POWER LIMITING ELEMENT TOLERANCE P25 C VOLTAGE UL % W V 30 500 1, 2, 5, 10 MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS Mechanical Protection Dissipation and Associated Resistive Element Substrate Connections Weight Mounting Torqure Molded Thick film Alumina Tinned copper 2 g max. Power Rating and Thermal Resistance of the Component Temperature Coefficient 1 Nm Standard Onto a heatsink 30 W at +25 C (case temp.) RTH (j - c): 4.2 C/W Free air: 2.25 W at +25 C See Performance table 150 ppm/C ENVIRONMENTAL SPECIFICATIONS Dielectric Strength MIL STD 202 1500 VRMS - 1 min 10 mA max. Temperature Range Insulation Resistance 104 M Inductance 0.1 H Climatic Category Flammability Revision: 16-Nov-17 -55 C to +150 C 55 / 155 / 56 IEC 60695-11-5 2 applications 30 s separated by 60 s Document Number: 50049 1 For technical questions, contact: sferfixedresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 LTO 30 www.vishay.com Vishay Sfernice PERFORMANCE TESTS CONDITIONS REQUIREMENTS EN 60115-1 1.5 Pr / 5 s US < 1.5 UL (0.5 % + 0.005 ) EN 60115-1 IEC 60068-2-14 Test Na 5 cycles -55 C to +155 C (0.5 % + 0.005 ) EN 60115-1 1000 h Pr at +25 C (1 % + 0.005 ) MIL-STD-202 method 103 B cond. D (0.5 % + 0.005 ) Vibration MIL-STD-202 method 204 cond. D (0.2 % + 0.005 ) Terminal Strength MIL-STD-202 method 211 cond. A1 (0.2 % + 0.005 ) 100G, MIL-STD-202 method 213 cond. I (0.5 % + 0.005 ) Momentary Overload Rapid Temperature Change Load Life Humidity (Steady State) Shock SPECIAL FEATURES 0.010 Resistance Values 0.015 Tolerances Typical Temperature Coefficient (-55 to +155 C) 0.1 0.5 250 ppm/C 150 ppm/C 1 % at 10 % 900 ppm/C 700 ppm/C CHOICE OF THE HEATSINK The user must choose according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 150 C. The dissipated power is simply calculated by the following ratio: 1 T P = ------------------------------------------------------------------------------------------R TH (j - c) + R TH (c - h) + R TH (h - a) P: Expressed in W T: Difference between maximum working temperature and room temperature RTH (j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component. RTH (c - h): Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device. RTH (h - a): Thermal resistance of the heatsink. Example: RTH (c - a) for LTO 30 power rating 10 W at ambient temperature +25 C Thermal resistance RTH (j - c): 4.2 C/W Considering equation (1) we have: T = 150 C - 25 C = 125 C T P 125 10 RTH (j - c) + RTH (c - h) + RTH (h - a) = ------- = -------- = 12.5 C/W RTH (c - h) RTH (h - a) = 12.5 C/W - 4.2 C/W = 8.3 C/W with a thermal grease RTH (c - h) = 1 C/W, we need a heatsink with RTH (h - a) = 7.3 C/W. Revision: 16-Nov-17 Document Number: 50049 2 For technical questions, contact: sferfixedresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 LTO 30 www.vishay.com Vishay Sfernice OVERLOADS POWER RATING In any case the applied voltage must be lower than the maximum overload voltage of 750 V. The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. The temperature of the case should be maintained within the limits specified. To improve the thermal conductivity, surfaces in contact should be coated with a silicone grease and the torque applied on the screw for tightening should be around 1 Nm. ENERGY CURVE 125 100 RATED POWER IN % ENERGY IN JOULES 100 10 1 0.1 75 50 25 0.01 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 0 0 20 OVERLOAD DURATION IN s 40 60 80 100 120 140 150 CASE TEMPERATURE IN C POWER CURVE 1 000 000 PACKAGING Tube of 50 units POWER IN W 100 000 MARKING 10 000 Model, style, resistance value (in ), tolerance (in %), manufacturing date, Vishay Sfernice trademark. 1000 100 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 OVERLOAD DURATION IN s Revision: 16-Nov-17 Document Number: 50049 3 For technical questions, contact: sferfixedresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 LTO 30 www.vishay.com Vishay Sfernice ORDERING INFORMATION LTO 30 F 2.7 k 1% xxx TU50 e3 MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE CUSTOM DESIGN optional on request: special TCR, shape etc. PACKAGING LEAD (Pb)-FREE 1% 2% 5% 10 % GLOBAL PART NUMBER INFORMATION L T O 0 3 0 F 2 7 0 0 0 J T E 3 GLOBAL MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING LEAD (Pb)-FREE LTO 030 F = radial leads The first four digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point. 48R70 = 48.7 48701 = 48 700 10002 = 100 000 R0100 = 0.01 R4700 = 0.47 27000 = 2700 = 2.7 k F=1% G=2% J=5% K = 10 % T = tube E3 = pure tin tube 50 pieces RELATED DOCUMENTS APPLICATION NOTES Potentiometers and Trimmers www.vishay.com/doc?51001 Guidelines for Vishay Sfernice Resistive and Inductive Components www.vishay.com/doc?52029 Revision: 16-Nov-17 Document Number: 50049 4 For technical questions, contact: sferfixedresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantability. Statements regarding the suitability of products for certain types of applications are based on Vishay's knowledge of typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements about the suitability of products for a particular application. It is the customer's responsibility to validate that a particular product with the properties described in the product specification is suitable for use in a particular application. Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over time. All operating parameters, including typical parameters, must be validated for each customer application by the customer's technical experts. Product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein. Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the Vishay product could result in personal injury or death. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners. (c) 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED Revision: 08-Feb-17 1 Document Number: 91000