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 Power Rating at 70°C (W) D Maximum L Maximum MF 12 0.125 1.85 3.5 MF 25 0.25 2.5 6.8 MF 50 0.5 3.5 10.0 d +0.02 H±3 -0.05 0.45 28.0 0.54 Dimensions : Millimetres Supplied bandoliered on tape (Box = 5000 pcs. for MF12 and MF25 Series) (Box = 1000 pcs. for MF50 Series). General Specification Style Dielectric withstanding voltage (V) Maximum working voltage (V) Maximum overload voltage (V) MF 12 400 200 400 MF 25 500 250 500 MF 50 700 350 700 Resistance Tolerance Temperature Coefficient Resistance Range ±1% ±50ppm/°C 1Ω to 1MΩ Dimensions : Millimetres Page 1 10/05/05 V1.0 MF12, MF25 & MF50 Series Metal Film Resistors Current Noise Level Derating Curve Load Life Percent rated load (%) +0.8 ∆R/R (%) +0.4 0 -0.4 -0.8 100Ω 1KΩ 10KΩ 100KΩ 1MΩ Nominal resistance (Ω) Ambient temperature (°C) Performance Specification Characteristics Test Methods Limits Natural resistance change per temperature degree centigrade. R2 - R1 Temperature coefficient Dielectric withstanding voltage R1(t2-t1) 6 X 10 (ppm/°C) R1: Resistance value at room temperature (t1) Within the temperature coefficient specified below Maximum TCR R2: Resistance value at room temperature plus 100°C (t2). ±50ppm/°C 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. No evidence of flashover mechanical damage, arcing or insulation break down. Resistance change after continuous five cycles for duty cycle specified Temperature cycling Step Temperature Time 1 -55°C ±3°C 30 minutes 2 Room temperature 10-15 minutes 3 +155°C ±3°C 30 minutes 4 Room temperature 10-15 minutes Resistance change rate is ±(1% +0.05Ω). 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 rate is ±(0.5% +0.05Ω). No evidence of mechanical damage. Pulse overload Resistance change after 10,000 cycles (1 second "on", 25 seconds "off") at 4 times RCWV. Resistance change rate is ±(1% +0.05Ω). No evidence of mechanical damage. 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 40°C ±2°C 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 70°C ±2°C ambient. Limits Resistance Value ∆R/R Normal type ±1.5% Resistance Value ∆R/R Normal type ±1.5% 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 No evidence of mechanical damage. 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 350°C ±10°C solder for 3 ±0.5 seconds. Resistance change rate is ±(1% +0.05Ω). No evidence of mechanical damage. The area covered with a new, smooth, clean, shiny and Solderability Resistance to solvent continuous surface free from concentrated pinholes. Test temperature of solder : 235°C ±5°C. Dwell time in solder : 3+0.5/-0 seconds. 95% coverage Minimum. Specimens shall be immersed in a bath of trichroethane No deterioration of protective coating and completely for 3 minutes with ultrasonic. markings. 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 = Ω K = Kilo ohms = KΩ. M = Mega ohms = MΩ. and replaces the decimal point. eg : 1R5 = 1.5Ω. 4K5 = 4.5KΩ. 6M8 = 6.8MΩ. Stocked Values Tolerance Wattage Range Value 1% 0.125W 1R - 1M 1% 0.25W 1R - 1M 1% 0.5W 1R - 1M Page 4 10/05/05 V1.0 MF12, MF25 & MF50 Series Metal Film Resistors Notes: International Sales Offices: AUSTRALIA – Farnell InOne FINLAND – Farnell InOne NETHERLANDS – Farnell InOne SWITZERLAND – Farnell InOne Tel No: Tel No: Tel No: ++ 61 2 9645 8888 Fax No: ++ 61 2 9644 7898 Fax No: ++ 358 9 345 5411 Fax No: ++ 31 30 241 7333 Tel No: ++ 41 1 204 64 64 Fax No: ++ 41 1 204 64 54 AUSTRIA – Farnell InOne FRANCE – Farnell InOne NEW ZEALAND – Farnell InOne UK – Farnell InOne Tel No: Tel No: Tel No: Tel No: ++ 43 662 2180 680 ++ 358 9 560 7780 ++ 33 474 68 99 99 ++ 31 30 241 7373 ++ 64 9 357 0646 ++ 44 8701 200 200 Fax No: ++ 43 662 2180 670 Fax No: ++ 33 474 68 99 90 Fax No: ++ 64 9 357 0656 Fax No: ++ 44 8701 200 201 BELGIUM – Farnell InOne GERMANY – Farnell InOne NORWAY – Farnell InOne UK – BuckHickman InOne Tel No: Tel No: Tel No: ++ 45 44 53 66 66 ++ 44 8450 510 150 ++ 32 3 475 2810 ++ 49 89 61 39 39 39 Fax No: ++ 32 3 227 3648 Fax No: ++ 49 89 613 59 01 Fax No: ++ 45 44 53 66 02 ++ 44 8450 510 130 BRAZIL – Farnell-Newark InOne HONG KONG – Farnell-Newark InOne Tel No: ++ 852 2268 9888 PORTUGAL – Farnell InOne UK – CPC ++ 55 11 4066 9400 Tel No: ++ 34 93 475 8804 ++ 44 8701 202 530 Fax No: ++ 55 11 4066 9410 Fax No: ++ 852 2268 9899 Fax No: ++ 34 93 474 5288 ++ 44 8701 202 531 CHINA – Farnell-Newark InOne IRELAND – Farnell InOne SINGAPORE – Tel No: Tel No: Tel No: ++86 10 6238 5152 Fax No: ++86 10 6238 5022 Farnell-Newark InOne Tel No: ++ 65 6788 0200 ++ 353 1 830 9277 Fax No: ++ 353 1 830 9016 Fax No: ++ 65 6788 0300 export EXPORT – Farnell InOne Tel No: ++ 44 8701 200 208 Fax No: ++ 44 8701 200 209 For enquiries from all other markets DENMARK – Farnell InOne ITALY – Farnell InOne SPAIN – Farnell InOne Tel No: Tel No: Tel No: ++ 45 44 53 66 44 ++ 39 02 93 995 200 ++ 34 93 475 8805 Fax No: ++ 45 44 53 66 06 Fax No: ++ 39 02 93 995 300 Fax No: ++ 34 93 474 5107 ESTONIA – Farnell InOne MALAYSIA – SWEDEN – Farnell InOne http://www.farnellinone.com 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 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. © Premier Farnell plc 2004. Page 5 10/05/05 V1.0