RD 1/4W 270R J T/B

CARBON FILM RESISTORS,FLAMEPROOF 1. Applicable Scope: This standard specification is for use in consumer electronics, computers, telecommunications, control instruments...etc. 2. Part Number: It is composed by Type, Rated Wattage,Nominal Resistance, Tolerance and Package/Terminal Form. e.g. RD Type 1/4W Rated Wattage 10R Nominal Resistance J Tolerance T/B Package/Terminal Form 2.1 Type : Carbon Film Resistors are called "RD". "RDN" represents flameproof. 2.2 Rated Wattage: Shown by "W", such as RD 1/8W(1/6W,1/4WS),1/4W(1/2WS),1/2W; RDN 1W,2W. 2.3 Nominal Resistance: Ω, KΩ, MΩ are its unit, which be in accordance with JIS-C6409 article 6 (EIA RS-196A) series. Letter "10R" indicates resistance value 10Ω. 2.4 Tolerance: It is measured by Bridge-method at room temperature and expressed by a capital letter. G＝±2%, J＝±5%, K＝±10%. 2.5 Package/Terminal Form: T/R＝tape & reel ; T/B＝tape in box; Nil＝Bulk ; MG form, M form, F form. Remark : RD Series Resistors are RoHS & Halogen Free Compliant. 3. Rated Power: Rated power is the value of Max load wattage specified at the ambient temperature of 70℃, 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 1 of 6 CARBON FILM RESISTORS,FLAMEPROOF 3.1 Rated Voltage: It is calculated through the following formula: where E: rated voltage (V) P: rated power (W) E  PXR R: nominal resistance value (Ω) 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. 4. Dimension and structure: 4.1 Dimension: Unit: mm Max Working Voltage D±1 L±1 H±3 d±0.1 Resistance Range RD 1/8W,1/6W(1/4WS) 1.7±0.2 3.7max 28 0.45 3.9Ω ~4.7MΩ 200V RD 1/4W(1/2WS) 2.4±0.5 6.4 28 0.6 3.9Ω ~10MΩ 250V RD 1/2W 3.5 9 28 0.65 3.9Ω ~10MΩ 350V RDN 1W 4.5 11 28 0.8 3.9Ω ~10MΩ 500V RDN 2W 5 15 28 0.8 3.9Ω ~10MΩ 750V TYPE ◎ Notes:1. too low or too high ohm value can be supplied only case by case. 2. Max Overload Voltage is 2 times of Max Working voltage. 3. Resistance value over 4.7MΩ (≧4.7MΩ ), while RD 1/8W is ≧1MΩ , the tolerance shall be ±10%. 4.RD 1/4W,1/2W can also supply flameproof form (RDN). 4.2 STRUCTURE: 4.2.1 Ceramic Rod: It is made of Forsterite imported. 4.2.2 Carbon Film: Under high vacuum and high temperature to split and oxidize the pure carbon-hydric. 4.2.3 Terminal: Terminal is to be firmly connected with resistors element, both electrically and mechanically, and allow easy soldering. 4.2.4 Coating: Coating is done by EPOXY insulating paint which is solid enough to be free from looseness, crack and easy breakage. The paint shall be limited within 1mm of lead wires from resistors body while the rated wattage is 2W the paint is limited within 2mm. RDN type is coated by flameproof paint which is resistant to 800℃ without causing looseness, crack and easy breakage. 4.2.5 Marking: Marking is made by color coding on surface. 2 of 6 CARBON FILM RESISTORS,FLAMEPROOF 5. Operating Temperature Range: -55℃～155℃ 6. Mechanical Performance: 6.1 Terminal tensile: To Fix the resistor body, a static load of 1.5kgs. (1/8W & 1/4W axial form:1kg.)is to be gradually applied into the terminal for 10 seconds without causing any looseness and fall. 6.2 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. 7. Electrical Performance: 7.1 Resistance Temperature Coefficient: It shall be as following: T.C. 0 ~ -450 0 ~ -700 0 ~ -1000 0 ~ -1300 1/6W , 1/8W ≦47KΩ 51KΩ ~100KΩ 110KΩ ~330KΩ 360KΩ ~1MΩ 1/4W & OVER ≦100KΩ 110KΩ ~1MΩ 1.1MΩ ~2.2MΩ 2.4MΩ ~4.7MΩ TYPE T.C. (ppm/℃) =〔(R2－R1) ÷R1〕 ×〔1 ÷(T2－T1)〕 ×10 where 6 R1: resistance value at reference temperature R2: resistance value at test temp. T1: reference temp. (usu. 25℃) T2: test temp. (about 75℃) 7.2 Temperature Cycle: Following temp. cycles are to be made 5 times and then put at room temp. for one hour, the resistance value change rate between pre-and-post test shall be within ±1%. Steps st 1 step nd 2 step rd 3 step th 4 step Temperature(℃) -55 ± 3 Room temp. 155 ± 3 Room temp. Time (minutes) 30 3 30 3 7.3 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%. 7.4 Insulation Character : Resistors are located in a V-shaped metal trough. Using the DC 100V or 500V megger instrument 2 poles to clutch either side of lead wires and metal trough, measuring the Insulation Resistance which shall be over 10000MΩ . 3 of 6 CARBON FILM RESISTORS,FLAMEPROOF 7.5 Voltage Withstanding: Resistors are located in a V-shaped metal trough. RD: applying Max overload voltage for one minute (RDN: applying 350V AC for one minute) and should find no physical damage to the resistors. The resistance value change shall be within ±0.5%. 7.6 Load Life: The resistors arrayed are sent into the 70℃ oven, applying rated voltage at the cycle of 1.5 hours ON, 0.5 hour OFF for 1000+48 hours in total. Then, after removing the voltage, -0 take the resistors out of the oven and left under normal temp. for one hour cooling. The resistance value change rate between pre-and-post test shall be within ±5%. 7.7 Moisture-proof Load Life: The resistors arrayed are placed into a constant temp./humidity oven at the temp. of 40± 2℃ and the humidity of 90～95%, then rated power is applied for 1.5 hours and cut off for 0.5 hour. The similar cycle will be repeated for 500+24 -0 hours in total (including cut-off time). Then remove the voltage, taking the resistors out of the oven and leaving them at room temp. for one hour. The resistance value change rate between pre-and-post test shall be within ±5%. There also shall be no evidence of remarkable change on appearance, and the marking shall not be illegible. 7.8 Solder-ability: The leads with flux are dipped in a melted solder of 235±5℃ for 2 seconds, more than 95% of the circumference of the lead wires shall be covered with solder. 7.9 Resistance to Soldering Heat: Two leads are together dipped in a melted solder of 270±5℃ for 10±1 seconds, or 350± 10℃ for 3.5±0.5 seconds, Then remove the resistors and leaving them at room temp. for one hour. The resistance value change rate between pre-and-post test shall be within ±1%. 7.10 Nonflammability:(only for RDN) The resistors are applied the power of 16 times the rated wattage for 5 min. and shall not get flame. 8.Forming: 8.1 MG Form: Unit: mm A±0.02 B±0.05 C±0.2 Wattage L±1 D±1 P H h±1 1/4W(1/2WS) 6.4 2.4±0.5 10±1 7±1 4.5 0.2 0.8 1.2 1/2W 9 3.5 15±1.5 7±1 4.5 0.2 0.8 1.2 1W 11 4.5 15±1.5 7±1 4.5 0.3 1 1.4 2W 15 5 20±2 10±2 4.5 0.3 1 1.4 4 of 6 CARBON FILM RESISTORS,FLAMEPROOF 8.2 M Form: Unit: mm Wattage L±1 D±1 P H±0.5 1/8W、1/6W、1/4WS 3.7max 1.7±0.2 5±0.5 3.5 1/4W、1/2WS 6.4 2.4±0.5 10±1 3.5 1/2W 9 3.5 15±1.5 3.5 1W 11 4.5 15±1.5 3.5 2W 15 5 20±2 3.5 8.3 F Form: Unit: mm Wattage L±1 D±1 A+1/-0.5 Applicable 1W 11 4.5 3.5 F1~F4 2W 15 5 3.5 F1~F4 9. Packing: 9.1 Taping Specifications: Unit: mm Size A Wattage B C±1 D Max E Max Type T-26 26＋1 -0 5±0.5 6 0.6 1.2 T-52 52±1 5±0.5 6 0.6 1.2 1/2W T-52 52±1 5±0.5 6 0.6 1.2 1W T-63 63±1 5±0.5 6 0.6 1.2 T-63 63±1 10±1 6 0.6 1.2 T-76 76±1.5 10±1 6 0.6 1.2 ≦1/4W 2W 5 of 6 CARBON FILM RESISTORS,FLAMEPROOF 9.2 Tape in Box: Unit: mm Wattage TYPE QTY PER BOX a b c T-26 5,000 50 70 255 T-52 5,000 75 70 255 T-26 4,000 50 90 255 T-52 5,000 75 100 255 1/2W T-52 1,000 75 55 255 1W T-63 1,000 85 105 260 2W T-63 1,000 100 110 265 1/8W,1/6W,(1/4WS) 1/4W(1/2WS) 9.3 Tape & Reel: Unit: mm Wattage TYPE QTY PER REEL A B C D E F 1/4W(1/2WS) T-52 5,000 285 310 75 80 295 295 1/2W T-52 2,500 285 310 75 80 295 295 1W T-63 2,000 285 310 75 95 295 295 T-63 1,000 285 310 75 95 295 295 T-76 1,000 285 310 90 105 295 295 2W 10. Precautions In Use: To prevent electric corrosion risk (10 ppm defect rate over 1 year use).the resistance value over 100KΩ should be limited at 50V when ambient temperature and humidity is higher than 85℃/85%. 6 of 6