Metal Oxide Film Resistor Applicable Scope This standard specification is for use in consumer electronics, computers, telecommunications, control instruments etc. Specifications Type : Metal Oxide Film Resistors, Flameproof. Rated Wattage : 0.5W Nominal Resistance : 10k (which be in accordance with JIS-C6409 article 6 (EIA RS-196A) series) Tolerance : 5% Rated Power Rated power is the value of Max load voltage specified at the ambient temperature of 70C, and shall meet the functions of electrical and mechanical performance. When the ambient temperature surpasses above mentioned temperature, the value declines as per following Derating Curve. Rated Voltage: It is calculated through the following formula: E = P R Where E: rated voltage (V) P: rated power (W) R: nominal resistance value () However, in case the voltage calculated exceeds the maximum load voltage, such the maximum load voltage shall be regarded as its rated voltage, means whichever less. Dimension and structure d H L H D Resistance Max Working Max Overload Type D 1 L 1 H 3 d 0.1 Range Voltage Voltage 0.5W (1/2W) 3 9 28 0.65 0.22 ~ 33K 300V 400V www.element14.com www.farnell.com www.newark.com www.mcmelectronics.com Page <1> 04/10/17 V1.0Metal Oxide Film Resistor Structure Ceramic Rod It is made of Forsterite. Terminal Terminal is to be firmly connected with resistors element, both electrically and mechanically, and allow easy soldering. Coating Coating is done by light grey flameproof paint for this type of resistors, which is solid enough to be free from looseness, crack and easy breakage. It is also resistant to cleaning and industrial solvents, and the paint shall be limited within 2mm of lead wires from resistor body. Marking Marking is made on resistors surface, by four colour coding 1st, 2nd, 3rd: nominal resistance, 4th: tolerance. or marked with type of resistor, rated wattage, nominal resistance, tolerance and makers trade mark. Operating Temperature Range : -55C to +155C Mechanical Performance Terminal Tensile To fix the resistor body, a static load of 2.5kgs. (under 1/2W:1kg.)is to be gradually applied into the terminal for 10 seconds without causing any looseness and fall. Twist withstand To bend the lead wire at the point of about 6mm from resistor body to 90, then catch the wire at 1.2 0.4mm apart from the bent point end and turn it (clockwise) by 360 degrees perpendicular to the resistor axis at speed of 5 seconds per turn, and do the same counterclockwise again which constitute a whole turn. Repeat the turn 2 times without causing any break and looseness. Electrical Performance Resistance Temperature Coefficient It shall be within 300ppm/C. 6 T.C (ppm/C) = (R2-R1)R1 1(T2-T1) 10 Where R1: resistance value at reference temperature R2: resistance value at test temp. T1: reference temp. (use. 25C) T2: test temp. (about 75C) Short Time Over Load When the resistors are applied 2.5 times as much as rated voltage for 5 seconds continuously, it shows no evidence of arc, flame etc. Removing the voltage and place the resistors to the normal condition for 30 minutes, the resistance value change rate between pre-and-post test shall be within 1%. Insulation Character Resistors are located in a V-shaped metal trough. Using the DC 500V megger instrument 2 poles to clutch either side of lead wires and metal trough, measuring the Insulation Resistance which shall be over 1000M. Voltage Withstanding Resistors are located in a V-shaped metal trough. Applying Max Working Voltage for one minute and should find no physical damage to the resistors, such as arc, char etc. www.element14.com www.farnell.com www.newark.com www.mcmelectronics.com Page <2> 04/10/17 V1.0