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| Resistors Carbon film resistors R20 (3.2 1.9 size: 1 / 4W) ROHM resistors are produced using an integrated production system for parts and materials, and state of the art technology to ensure high precision productivity, and quality. ROHM resistors are ISO-9001 approved. The design and specifications are subject to change without prior notice. Before ordering or use, please cheak the technical specification sheets. FFeatures 1) All ceramic rods are made from the same material to yield consistent quality. 2) Unique production methods provide outstanding mechanical strength characteristics. 3) Superb accuracy of axial taping means excellent highspeed automatic insertion. 4) Though miniaturized, the R20 retains the high pulse resistance of its predecessor chips. 5) Soft copper wire with solder plating offers superior solderability. 6) Both insulator coating and its color codes are highly resistant to solvents, and steam cleaning is no problem. 7) Highly nonflammable insulation coating (UL94V-0). 1 Resistors FRatings R20 Note: This product meets the specifications given in this specification sheet, but it is influenced by the applied voltage and ambient conditions. For this reason, if the product is to be used in equipment that must be extremely reliable, pay careful consideration to the load rate on the component when designing the equipment. In cases such as this, we recommend that you design the circuit so that the voltage on the component is no more than half of its rated value. In particular, when the component is used in AC circuits, take steps to ensure that the peak voltage applied to the component is less than the maximum operating voltage. 2 Resistors FCharacteristics R20 3 Resistors R20 4 Resistors R20 5 Resistors FExternal dimensions (Units: mm) R20 (9) Outer coating: Epoxy resin (color: light brown) This coating offers superior resistance to heat, the elements, and solvents, and is a good insulator. It is also very safe, meeting the UL94V-0 standard for nonflammability. (10) Markings: Color coding using thermo-hardened paint Markings offer outstanding resistance to solvents and chemicals, and do not fade. FReference standards ROHM's pioneering products meet the following domestic and international standards. SJIS C 5202: Regulations on test methods for fixed resistors SJIS C 5003: Regulations on test methods for malfunction rates SJIS C 6402: Resistors, fixed, carbon film SMIL-R-11: Resistors, fixed, composition (insulated) SMIL-R-10509: Resistors, fixed, film (high stability) SMIL-R-22684: Resistors, fixed, film, insulated SEIA-RS-196: Fixed film resistors--precision and semi-precision SDIN-44052: Resistors, fixed, lacquered, cracked carbonfilm, high stability, with axial leads FPulse voltage limits The pulse voltage rating (1) is determined by the following formula. However, if the value obtained from the formula exceeds the maximum pulse voltage (2) or the resistance-limited voltage peak value (3), the lowest value must be taken as the pulse voltage rating. (1) Pulse voltage rating FStructure and materials (1) Substrate: Alumina magnetic rod Alumina is superior to regular mullite or forsterite with respect to mechanical strength, thermal conductivity, and thermal stability. (2) Resistive elements 0: Copper film Less than 10: Nickel film. In addition to their high stability, these resistors are designed to cut off safely in the event of a voltage spike. 10 and above: Carbon film. This type of film offers superior uniformity and stability. (3) Cutting groove The groove is cut to a uniform depth and width across the whole element, and there are no chips or cracks in the finished product. (4) Terminals: Tin-plated copper, steel cap This material provides a solid physical and electrical connection. (5) Connections: Spot-welded Spot welding ensures a solid, durable connection between the terminal and the terminal wire. (6) Terminal wires: Solder-plated copper wire Can be soldered effectively even after a long time. (7) Protective film For resistors of 10 or more, a special inorganic material guarantees the long-term stability of the dielectric film. (8) Under coating: Phenolic resin The dielectric film is protected by a coat of high-purity phenolic resin. Vp + P f R t P: Rated power(W) f: repetition frequency (Hz) R: nominal resistance () t: pulse width (s) (2) Maximum pulse voltage R20 600V R25X 750V (3) Resistance-limited voltage peak Less than 10 Up to four times the rated DC voltage 10 or more Up to seven times the rated DC voltage It is assumed that the pulse width is less than 10ms. 6 Resistors FMakeup of the part number R20 FElectrical characteristics 7 Resistors R20 8 |
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