EU FUSING RESISTORS RoHS Fusing Flat Chip Resistors RF73 Construction Coating color Brown Features Dimensions Dimensionsmm Type Weightg Inch Size Code L0.2 W c d t0.1 1000pcs RK73 1J 1.6 0.80.1 0.30.1 0.30.1 2.14 UL1412 1J 0603 0.5 2A 0.2 2.0 1.250.1 0.40.2 0.3 0.1 4.54 .3 0805 RoHS 2B 1.60.2 9.14 RoHS 1206 3.2 2E 2.60.2 15.5 1210 0.2 0.50.3 0.4 0.1 0.6 In normal condition, it works as a resistor and .3 2H 5.0 2.50.2 24.3 2010 when excessive voltage is applied, it protects 3A circuits by fusing quickly. 6.3 3.10.2 37.1 2512 The same shape as RK73 series. Recognized by safety standard UL1412. Type Designation (1J is not recognized.) Example Suitable for both flow and reflow solderings. Products with lead free termination meet RF73 2B T TD 100 J EU-RoHS requirements. EU-RoHS regulation is not intended for Pb-glass contained in electrode, Product Power Terminal Taping Nominal Resistance Code Rating Surface Material Resistance Tolerance resistor element and glass. 1J :0.063W TSn TD: 4mm pitch 3 digits J: 5% 2A :0.1W LSn/Pb punch paper Approval Awarded 2B :0.125W TE: 4mm pitch 2E :0.25W plastic RF73 2A, 2B, 2E, 2H, 3A 2H:0.5W embossed 3A :1.0W BK:Bulk UL1412 File No.E117262 Reference Standards EU-RoHS APPENDIX C IEC 60115-8 The terminal surface material lead free is standard. JIS C 5201-8 Contact us when you have control request for environmental hazardous material other than the EIAJ RC-2124 substance specified by EU-RoHS. For further information on taping, please refer to APPENDIX C on the back pages. Ratings Fusing Characteristics / Resistance Taping & Power Type Range Resistance T.C.R. Q ty/Reelpcs Rating 6 E24 Tolerance 10 /K Fusing Power Fusing Time TD TE 1000500 2.6W 2.4W 2.1W 1.03.3 1J 0.063W 1100 5,000 1.0 1.120 22100 500 3.6100 3.0W 2.6W 2.4W 2.1W 2.0W 2A 0.1W 5,000 4,000 0.20.47 0.511.0 1.120 22100 110510 3.75W 2.875W 2.5W 2.0W 1.75W 2B 0.125W 5,000 4,000 5% 60s Max. 0.20.47 0.5110 1124 27100 110510 1000500 4.5W 4.1W 3.5W 3.2W 3.0W 0.24.3 2E 0.25W 0.2510 5,000 4,000 0.20.47 0.514.7 5.127 30100 110510 500 4.7510 5.5W 5.0W 4.0W 3.5W 3.2W 2H 0.5W 4,000 0.20.47 0.514.7 5.127 30100 110510 6.5W 6.0W 5.0W 4.5W 4.0W 3A 1.0W 4,000 0.20.47 0.514.7 5.130 33100 110510 Rated Ambient Temperature70 Operating Temperature Range55125 Oct. 2018 Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment. Malfunction or failure of the products in such applications may cause loss of human life or serious damage. www.koaglobal.com Flat Chip Resistors Flat Chip Resistors Derating Curve 70 For resistors operated at an ambient temperature of 70 or above, a power rating shall be derated in accordance with derating curve on the left. 1 One-pulse Limiting Electric Power Example of Fusing Characteristics Performance P e r fo r m a n c e R e q u i re m e n t s R0.1 Te s t I te m s Te s t M et h o d s L i m it Ty p i c a l 25 R e sis t a n c e W it h i n s p e cifi e d to l e r a n c e 2 5 /5 5 a n d 2 5 /12 5 T.C. R . W it h i n s p e cifi e d T. C . R . 2 5 2 E , 2 H , 3 A1. 5 5 2 O ve rl o a dS h o r t ti m e R a te d vo lt a g e2 fo r 5 s ( E xc e pt 2 E , 2 H , 3 A : 1. 5 ) 3 0. 5 2 6 0 5 , 10 s1s R e sis t a n c e to s o l d e ri n g h e a t 0. 52 A3A 0. 32 A3A 5 5 3 0 m i n . /12 5 3 0 m i n . 5 cycl e s R a p i d c h a n g e of te m p e r a t u re 31J 0.61J 4 0 2 , 9 0 % 9 5 % R H , 5 0 0 h 5 2 M o is t u re re sis t a n c e 1. 5 O N / 0 . 5 O F F 1. 5 h O N / 0 . 5 h O F F cycl e 70 7 0 2 , 10 0 0 h 5 1 E n d u r a n c e a t 7 0 1. 5 O N / 0 . 5 O F F 1. 5 h O N / 0 . 5 h O F F cycl e 1 0 . 6 12 5 , 10 0 h H ig h te m p e r a t u re ex p o s u re Precautions for Use 2H3A FR4 1J2E2H3A 1,000 The substrate of chip resistors is alumina. Cracks may occur at the connection of solder (solder fillet portion) due to the difference of the coefficient of thermal expansion from a mounting board when heat stress like heat cycle, etc. are repeatedly given to them. Care should be taken to the occurrence of the cracks when the change in ambient temperature or ON /OFF of load is repeated, especially when large types of 2H/3A which have large thermal expansion and also self heating. By general temperature cycle test using glass- epoxy(FR-4) boards under the maximum/minimum temperatures of operating temperature range, the crack does not occur easily in the types of 1J2E, but the crack tends to occur in the types of 2H/3A. The occurrence of the crack by heat stress may be influenced by the size of a pad, solder volume, heat radiation of mounting board etc., so please pay careful attention to designing when a big change in ambient temperature and conditions for use like ON/OFF of load can be assumed. Maximum open-circuit voltage is the maximum value of the voltage applicable to both ends of resistors, when a fuse resistor becomes open conditions in a circuit. It differs according to the form of a product and a resistance value and is specified individually. The maximum open-circuit voltage is the lower one, whichever the voltage 1000 times of the rated power or the voltage shown in below table. Use the components under the voltage applied between the terminals of resistors to be under the maximum open-circuit voltage regardless of normal operating or abnormal operating time of equipment. Type 1J 2A 2B 2E 2H 3A 50V 50V 50V 50V 100V 100V Maximum Open-Circuit Voltage Oct. 2018 Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment. Malfunction or failure of the products in such applications may cause loss of human life or serious damage. www.koaglobal.com