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| MF12, MF25 & MF50 Series Metal Film Resistors Materials and Features: * EIA standard colour-coding. * Low noise and voltage coefficient. * Low temperature coefficient range. * Nichrome resistor element provides stable performance in various environments. * Multiple epoxy coating on vacuum-deposited metal film provides superior moisture protection. Dimension: Style MF 12 MF 25 MF 50 Power Rating at 70C (W) 0.125 0.25 0.5 D Maximum 1.85 2.5 3.5 L Maximum 3.5 6.8 10.0 d +0.02 -0.05 0.45 0.54 H3 28.0 Dimensions : Millimetres Supplied bandoliered on tape (Box = 5000 pcs. for MF12 and MF25 Series) (Box = 1000 pcs. for MF50 Series). General Specification Style MF 12 MF 25 MF 50 Dielectric withstanding voltage (V) 400 500 700 Maximum working voltage (V) 200 250 350 Maximum overload voltage (V) 400 500 700 Dimensions : Millimetres Resistance Tolerance Temperature Coefficient Resistance Range 1% 50ppm/C 1 to 1M Page 1 10/05/05 V1.0 MF12, MF25 & MF50 Series Metal Film Resistors Current Noise Level Derating Curve +0.8 Load Life Percent rated load (%) +0.4 R/R (%) 0 -0.4 -0.8 100 1K 10K 100K 1M Nominal resistance () Ambient temperature (C) Performance Specification Characteristics Test Methods Natural resistance change per temperature degree centigrade. R2 - R1 Temperature coefficient R1(t2-t1) X 10 (ppm/C) 6 Limits Within the temperature coefficient specified below Maximum TCR 50ppm/C No evidence of flashover mechanical damage, arcing or insulation break down. R1: Resistance value at room temperature (t1) R2: Resistance value at room temperature plus 100C (t2). Dielectric withstanding voltage Resistors shall be clamped in the trough of a 90 metallic V-block and shall be tested at AC potential respectively specified in the above list for 60 +10/-0 seconds. Resistance change after continuous five cycles for duty cycle specified Step Temperature -55C 3C Room temperature +155C 3C Room temperature Time 30 minutes 10-15 minutes 30 minutes 10-15 minutes 1 2 3 4 Temperature cycling Resistance change rate is (1% +0.05). No evidence of mechanical damage. Short-time overload Permanent resistance change after the application of a potential of 2.5 times RCWV for 5 seconds. Resistance change after 10,000 cycles (1 second "on", 25 seconds "off") at 4 times RCWV. Resistance change rate is (0.5% +0.05). No evidence of mechanical damage. Resistance change rate is (1% +0.05). No evidence of mechanical damage. Pulse overload Page 2 10/05/05 V1.0 MF12, MF25 & MF50 Series Metal Film Resistors Performance Specification Characteristics Test Methods Resistance change after 1000 hours (1.5 hours "on", 0.5 Load life in humidity hour "off") at RCWV in a humidity test chamber controlled at 40C 2C and 90 to 95% relative humidity. Permanent resistance change after 1000 hours operating at Load life RCWV with duty cycle of 1.5 hours "on" 0.5 hours "off" at 70C 2C ambient. Direct Load: Resistance to a 2.5kgs direct load for 10 seconds in the direction of the longitudinal axis of the terminal leads. Terminal strength Twist test: Terminal leads shall be bent through 90 at a point of about 6mm from the body of the resistor and shall be rotated through 360 about the original axis of the bent terminal in alternating direction for a total of 3 rotations. Resistance to soldering heat Permanent resistance change when leads immersed to 3.2 - 4.8mm from the body in 350C 10C solder for 3 0.5 seconds. The area covered with a new, smooth, clean, shiny and Solderability continuous surface free from concentrated pinholes. Test temperature of solder Dwell time in solder Resistance to solvent : 235C 5C. : 3+0.5/-0 seconds. No deterioration of protective coating and markings. 95% coverage Minimum. Resistance change rate is (1% +0.05). No evidence of mechanical damage. No evidence of mechanical damage. Limits Resistance Value Normal type Resistance Value Normal type R/R 1.5% R/R 1.5% Specimens shall be immersed in a bath of trichroethane completely for 3 minutes with ultrasonic. RCWV = Rated Continuous Working Voltage = Rated Power X Resistance Value Page 3 10/05/05 V1.0 MF12, MF25 & MF50 Series Metal Film Resistors Part Number Explanation: MF 12 1R5 Type Wattage Rating OHMIC Values Wattage Rating : 12 = 0.125W, 25 = 0.25W and 50 = 0.5W. OHMIC Values : Where R = Ohms = K = Kilo ohms = K. M = Mega ohms = M. and replaces the decimal point. eg : 1R5 = 1.5. 4K5 = 4.5K. 6M8 = 6.8M. Stocked Values Tolerance 1% 1% 1% Wattage 0.125W 0.25W 0.5W Range Value 1R - 1M 1R - 1M 1R - 1M Page 4 10/05/05 V1.0 MF12, MF25 & MF50 Series Metal Film Resistors Notes: International Sales Offices: AUSTRALIA - Farnell InOne Tel No: ++ 61 2 9645 8888 Fax No: ++ 61 2 9644 7898 FINLAND - Farnell InOne Tel No: ++ 358 9 560 7780 Fax No: ++ 358 9 345 5411 NETHERLANDS - Farnell InOne Tel No: ++ 31 30 241 7373 Fax No: ++ 31 30 241 7333 SWITZERLAND - Farnell InOne Tel No: ++ 41 1 204 64 64 Fax No: ++ 41 1 204 64 54 AUSTRIA - Farnell InOne Tel No: ++ 43 662 2180 680 Fax No: ++ 43 662 2180 670 FRANCE - Farnell InOne Tel No: ++ 33 474 68 99 99 Fax No: ++ 33 474 68 99 90 NEW ZEALAND - Farnell InOne Tel No: ++ 64 9 357 0646 Fax No: ++ 64 9 357 0656 UK - Farnell InOne Tel No: ++ 44 8701 200 200 Fax No: ++ 44 8701 200 201 BELGIUM - Farnell InOne Tel No: ++ 32 3 475 2810 Fax No: ++ 32 3 227 3648 GERMANY - Farnell InOne Tel No: ++ 49 89 61 39 39 39 Fax No: ++ 49 89 613 59 01 NORWAY - Farnell InOne Tel No: ++ 45 44 53 66 66 Fax No: ++ 45 44 53 66 02 UK - BuckHickman InOne ++ 44 8450 510 150 ++ 44 8450 510 130 BRAZIL - Farnell-Newark InOne Tel No: ++ 55 11 4066 9400 Fax No: ++ 55 11 4066 9410 HONG KONG - Farnell-Newark InOne Tel No: ++ 852 2268 9888 Fax No: ++ 852 2268 9899 PORTUGAL - Farnell InOne Tel No: ++ 34 93 475 8804 Fax No: ++ 34 93 474 5288 UK - CPC ++ 44 8701 202 530 ++ 44 8701 202 531 CHINA - Farnell-Newark InOne Tel No: ++86 10 6238 5152 Fax No: ++86 10 6238 5022 IRELAND - Farnell InOne Tel No: ++ 353 1 830 9277 Fax No: ++ 353 1 830 9016 SINGAPORE - Farnell-Newark InOne Tel No: ++ 65 6788 0200 export EXPORT - Farnell InOne Tel No: ++ 44 8701 200 208 Fax No: ++ 44 8701 200 209 Fax No: ++ 65 6788 0300 For enquiries from all other markets DENMARK - Farnell InOne Tel No: ++ 45 44 53 66 44 Fax No: ++ 45 44 53 66 06 ITALY - Farnell InOne Tel No: ++ 39 02 93 995 200 Fax No: ++ 39 02 93 995 300 SPAIN - Farnell InOne Tel No: ++ 34 93 475 8805 Fax No: ++ 34 93 474 5107 http://www.farnellinone.com ESTONIA - Farnell InOne Tel No: ++ 358 9 560 7780 Fax No: ++ 358 9 345 5411 Farnell-Newark InOne Tel No: ++ 60 3 7873 8000 Fax No: ++ 60 3 7873 7000 MALAYSIA - SWEDEN - Farnell InOne Tel No: ++ 46 8 730 50 00 Fax No: ++ 46 8 83 52 62 http://www.buckhickmaninone.com http://www.cpc.co.uk Disclaimer This data sheet and its contents (the "Information") belong to the Premier Farnell Group (the "Group") or are licensed to it. No licence is granted for the use of it other than for information purposes in connection with the products to which it relates. No licence of any intellectual property rights is granted. The Information is subject to change without notice and replaces all data sheets previously supplied. The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness, any error in or omission from it or for any use made of it. Users of this data sheet should check for themselves the Information and the suitability of the products for their purpose and not make any assumptions based on information included or omitted. Liability for loss or damage resulting from any reliance on the Information or use of it (including liability resulting from negligence or where the Group was aware of the possibility of such loss or damage arising) is excluded. This will not operate to limit or restrict the Group's liability for death or personal injury resulting from its negligence. Multicomp is the registered trademark of the Group. (c) Premier Farnell plc 2004. Page 5 10/05/05 V1.0 |
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