MF12 ETC2

Document overview

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Technical content

MF12, MF25 & MF50 Series Metal Film Resistors Page 1 10/05/05 V1.0 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 H±3 MF 12 0.125 1.85 3.5 0.45 28.0MF 25 0.25 2.5 6.8 0.54 MF 50 0.5 3.5 10.0 +0.02 -0.05 d Dimensions : Millimetres General Specification Style Dielectric withstanding voltage (V) Maximum working voltage (V) Maximum overload voltage (V) Resistance Tolerance Temperature Coefficient Resistance Range MF 12 400 200 400 ±1% ±50ppm/°C 1Ω to 1MΩMF 25 500 250 500 MF 50 700 350 700 Dimensions : Millimetres Supplied bandoliered on tape (Box = 5000 pcs. for MF12 and MF25 Series) (Box = 1000 pcs. for MF50 Series).

MF12, MF25 & MF50 Series Metal Film Resistors Page 2 10/05/05 V1.0 Current Noise Level Derating Curve Load Life Performance Specification Characteristics Test Methods Limits Temperature coefficient Natural resistance change per temperature degree centigrade. R2 - R1 R1(t2-t1) R1: Resistance value at room temperature (t 1) R2: Resistance value at room temperature plus 100°C (t 2). Within the temperature coefficient specified below Maximum TCR ±50ppm/°C 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. No evidence of flashover mechanical damage, arcing or insulation break down. Temperature cycling Resistance change after continuous five cycles for duty cycle specified Resistance change rate is ±(1% +0.05Ω). No evidence of mechanical damage. 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

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. X 10 (ppm/°C) 100Ω 1KΩ 10KΩ 100KΩ 1MΩ +0.8 +0.4 -0.4 -0.8 ∆R/R (%) Nominal resistance (Ω) Percent rated load (%) Ambient temperature (°C)

MF12, MF25 & MF50 Series Metal Film Resistors Page 3 10/05/05 V1.0 Characteristics Test Methods Limits Load life in humidity Resistance change after 1000 hours (1.5 hours "on", 0.5 hour "off") at RCWV in a humidity test chamber controlled at 40°C ±2°C and 90 to 95% relative humidity. Resistance Value ∆∆R/R Normal type ±1.5% Load life Permanent resistance change after 1000 hours operating at RCWV with duty cycle of 1.5 hours "on" 0.5 hours "off" at 70°C ±2°C ambient. Resistance Value ∆∆R/R Normal type ±1.5% Terminal strength Direct Load: Resistance to a 2.5kgs direct load for 10 seconds in the direction of the longitudinal axis of the terminal leads. 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. No evidence of mechanical damage. 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. Solderability The area covered with a new, smooth, clean, shiny and 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. Resistance to solvent Specimens shall be immersed in a bath of trichroethane completely for 3 minutes with ultrasonic. No deterioration of protective coating and markings. RCWV = Rated Continuous Working Voltage = √ Rated Power X Resistance Value Performance Specification

MF12, MF25 & MF50 Series Metal Film Resistors Page 4 10/05/05 V1.0 Part Number Explanation: MF Type Wattage Rating 1R5 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 = 1.5 Ω. 4K5 = 4.5KΩ. 6M8 = 6.8MΩ. Tolerance Wattage Range Value 1% 0.125W 1R - 1M 1% 0.25W 1R - 1M 1% 0.5W 1R - 1M Stocked Values

For enquiries from all other markets MF12, MF25 & MF50 Series Metal Film Resistors Page 5 10/05/05 V1.0 Notes: International Sales Offices: AUSTRALIA– Farnell InOne Tel No: ++ 61 2 9645 8888 Fax No: ++ 61 2 9644 7898 FRANCE – Farnell InOne Tel No: ++ 33 474 68 99 99 Fax No: ++ 33 474 68 99 90 NORWAY– Farnell InOne Tel No: ++ 45 44 53 66 66 Fax No: ++ 45 44 53 66 02 AUSTRIA – Farnell InOne Tel No: ++ 43 662 2180 680 Fax No: ++ 43 662 2180 670 GERMANY – Farnell InOne Tel No: ++ 49 89 61 39 39 39 Fax No: ++ 49 89 613 59 01 PORTUGAL– Farnell InOne Tel No: ++ 34 93 475 8804 Fax No: ++ 34 93 474 5288 ESTONIA – 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 UK – Farnell InOne Tel No: ++ 44 8701 200 200 Fax No: ++ 44 8701 200 201 SINGAPORE– Farnell-Newark InOne Tel No: ++ 65 6788 0200 Fax No: ++ 65 6788 0300 HONG KONG– Farnell-Newark InOne Tel No: ++ 852 2268 9888 Fax No: ++ 852 2268 9899 BELGIUM – Farnell InOne Tel No: ++ 32 3 475 2810 Fax No: ++ 32 3 227 3648 BRAZIL – Farnell-Newark InOne Tel No: ++ 55 11 4066 9400 Fax No: ++ 55 11 4066 9410 IRELAND – Farnell InOne Tel No: ++ 353 1 830 9277 Fax No: ++ 353 1 830 9016 SPAIN– Farnell InOne Tel No: ++ 34 93 475 8805 Fax No: ++ 34 93 474 5107 CHINA – Farnell-Newark InOne Tel No: ++86 10 6238 5152 Fax No: ++86 10 6238 5022 ITALY– Farnell InOne Tel No: ++ 39 02 93 995 200 Fax No: ++ 39 02 93 995 300 SWEDEN – Farnell InOne Tel No: ++ 46 8 730 50 00 Fax No: ++ 46 8 83 52 62 MALAYSIA– Farnell-Newark InOne Tel No: ++ 60 3 7873 8000 Fax No: ++ 60 3 7873 7000 SWITZERLAND– Farnell InOne Tel No: ++ 41 1 204 64 64 Fax No: ++ 41 1 204 64 54 DENMARK – Farnell InOne Tel No: ++ 45 44 53 66 44 Fax No: ++ 45 44 53 66 06 UK – CPC ++ 44 8701 202 530 ++ 44 8701 202 531 UK – BuckHickman InOne ++ 44 8450 510 150 ++ 44 8450 510 130 NEW ZEALAND– Farnell InOne Tel No: ++ 64 9 357 0646 Fax No: ++ 64 9 357 0656 EXPORT – Farnell InOne Tel No: ++ 44 8701 200 208 Fax No: ++ 44 8701 200 209 export FINLAND – Farnell InOne Tel No: ++ 358 9 560 7780 Fax No: ++ 358 9 345 5411 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 w as 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. http://www.farnellinone.com http://www.buckhickmaninone.com http://www.cpc.co.uk