深圳市浩思特电子有限公司 Approval Sheet for MELF Resistors MF72 series Tel:0755-27630756 Fax:0755-27630956 1 of 5 Mob:13246608771 Mr.wang http://www.greatland-resistor.com.cn 深圳市浩思特电子有限公司 1. 2. PRODUCT:: METAL FILM MELF TYPE PRECISION RESISTORS PART NUMBER:: Part number of the metal film MELF type resistor is identified by the name, power, tolerance, packing, temperature coefficient, special type and resistance value. Example： MF 72 0102 F C2 Series Size Name Code T Metrick Resistance Temperature Packing Size Tolerance Coefficient Style 100 Resistance Value (1) Style:: MF72 SERIES Power Rating:: MF72=0.125W Metric size: DIN: 0102 Tolerance:: F=±1% Packaging Type:: B＝Bag/box T＝Reel/Box (6) T.C.R.:: (7) Resistance Value:: 1R、10R、100R、470R、10K、100K、330K、1M……… (2) (3) (4) (5) 3. BAND-CODE: Tel:0755-27630756 Fax:0755-27630956 2 of 5 Mob:13246608771 Mr.wang http://www.greatland-resistor.com.cn 深圳市浩思特电子有限公司 4. ELECTRICAL CHARACTERISTICS QUICK REFERENCE DATA Type MF72 Metric type DIN: 0102 10Ω to 5MΩ Resistance range Resistance tolerance Temperature coefficient (%) (ppm/℃) B(±0.10); C(±0.25); D(±0.5); F(±1); J(±5%) C5(±15); C3(±25); Climatic category(LCT/UCT/days) 55/125/56 Rated dissipation, P70 0.125W Max.Working Voltage 150V Temperature range C2(±50) -55℃ to 155℃ Max.Overload Voltage 300V Insulation resistance >1GΩ ±0.1mm Dimension L=2.0; L1=0.8; D=1.3 Kmin=0.6; D1=D+0/D-0.25 Outlines Soldering bath (recomanded) (mm) S=0.8; W=2; H=2 Derating curve Tel:0755-27630756 Fax:0755-27630956 3 of 5 Mob:13246608771 Mr.wang http://www.greatland-resistor.com.cn 深圳市浩思特电子有限公司 *Standard resistance is 10Ω~ 1MΩ, below or over this resistance value in available under request. *Rated Continuous Working Voltage (RCWV)= 3. Power Rating × Resistance Value ENVIRONMENTAL CHARACTERISTICS (1) Short Time Over Load Test At 2.5 times of the rated voltage. (If the voltage exceeds the maximum load voltage, the maximum load voltage will be used as the rated voltage) applied for 5 seconds, the resistor should be free from defects after the resistor is released from load for about 30 minutes and the change of the resistance value should be within ±(0.25%+0.05Ω) as compared with the value before the test. (2) Dielectric Withstanding Voltage The resistor is placed on the metal V Block. Apply a Table I dielectric withstanding between the terminals connected together with the block for about 60 seconds. The resistor shall be able to withstand without breakdown or flashover. (3) Temperature Coefficient Test Test of resistors above room temperature 125°C to 130°C (Testing Temperature) at the constant temperature silicon plate for over 4 to 5 minutes. Then measure the resistance. The Temperature Coefficient is calculated by the following equation and its value should be within the range of requested. (No TCR test for resistance value under 10R) Re sistor Temperature Coefficient = R − R0 1 × × 10 6 t − t0 R0 R ＝ Resistance value under the testing temperature R0 ＝ Resistance value at the room temperature t ＝ The testing temperature to ＝ Room temperature (4) Insulation Resistance Apply test terminal on lead and resistor body. The test resistance should be high than 10,000 Mohm. (5) Solderability Immerse the terminal into the solder pot at 230±5°C for 5±0.5 seconds. At least 95% solder coverage on the termination. Tel:0755-27630756 Fax:0755-27630956 4 of 5 Mob:13246608771 Mr.wang http://www.greatland-resistor.com.cn 深圳市浩思特电子有限公司 (6) Resistance to Solvent The specimen into the appropriate solvent of Methyleme Chloride condition of ultrasonic machine for 1 minutes. The specimen is no deterioration of coatings and color code. (7) Load Life in Humidity Place the specimen in a test chamber at 40±2°C and 90~95% relative humidity. Apply the rated voltage to the specimen at the 1.5 hours on and 0.5 hour off cycle. The total length of test is 1000 hours. The change of the resistance value shall be within ±(0.5%+0.05Ω). (8) Load Life Test Placed in the constant temperature chamber of 70±3°C the resistor shall be connected to the lead wire at the point of 25mm. Length with each terminal, the resistors shall be arranged not much effected mutually by the temperature of the resistors and the excessive ventilation shall not be performed, for 90 minutes on and 30 minutes off under this condition the rated D.C. voltage is applied continuously for 1000+48/-0 hours then left at no-load for 1hour, the change of the resistance value measured at this time to the value before the test shall be within ±(0.5%+0.05Ω). There shall be no remarkable change in the appearance and the color code shall be legible after the test. (9) Temperature Cycling Test The temperature cycle shown in the following table shall be repeated 5 times consecutively. The measurement of the resistance value is done before the first cycle and after ending the fifth cycle, leaving in the room temperature for about 1 hour, the change shall be within ±(1%+0.05Ω). After the test the resistor shall be free from the electrical or mechanical damage. Temperature Cycling Conditions: Step Temperature(°C) Time (minute) 1 +25+10/ -5 10 to15 2 -65+0/ -3 30 3 +25+10/ -5 10 to15 4 +150+3/ -0 30 12. Resistance to soldering heat: The terminal shall be dipped into the solder pot at 235±10°C for 3±0.5 seconds. The change of the resistance value shall be within ±(0.25%+0.05Ω). Tel:0755-27630756 Fax:0755-27630956 5 of 5 Mob:13246608771 Mr.wang http://www.greatland-resistor.com.cn