MFF Series Metal Film, Fusible Resistors • • • • • Fusible Resistor Resistances from 1 Ohm to 10K Ohms Power Rating 1 to 3 Watts Resistance Tolerances of ±5% TCR: ± 250ppm/K Standard SPECIFICATIONS Type Wattage Rating ( Watts ) MFFS-1 1 MFF-1 1 MFFS-2 2 MFF-2 2 MFFS-3 3 Dimensions Ohmic Values Tolerances TCR 1 Ohm to 10K Ohms ±5% ±250ppm/K A B C ±0.040” [±1mm] ±0.020” [±0.5mm] ±0.002” [±0.05mm] D MIN 0.375 [9.5] 0.138 [3.5] 0.024 [0.6] 0.98 [25] 0.472 [12.0] 0.157 [4.0] 0.032 [0.8] 0.94 [24] 0.472 [12.0] 0.157 [4.0] 0.032 [0.8] 0.94 [24] 0.630 [16.0] 0.217 [5.5] 0.032 [0.8] 1.26 [32] 0.630 [16.0] 0.217 [5.5] 0.032 [0.8] 1.26 [32] Specification Value Minimum Fusing Overload ( Time ) Fusing Characteristics 1 Ohm to 3.6 Ohms 1.1K Ohms to 3K Ohms 15 Times Rated Power ( 30s MAX ) 3.9 Ohms to 1K Ohms 12 Times Rates Power ( 30s MAX ) Temperature Range -55°C to +155°C Insulation Resistance >10000 MOhms Max Working Voltage 300V ( 250V MFFS-1 ) Max Overload Voltage 600V ( 400V MFFS-1 ) Dielectric Voltage 400V Environmental Performance ΔR (MIL-STD 202) Load Life ±5% Resistance to Solder Heat ±0.5% + 0.05 Ohm Temperature Cycling ±1% + 0.02 Ohm Short Time Overload ±2% Ordering Information Part Number - Resistance - Tolerance Example: MFF-2 10 Ohm 5% Riedon Inc. 09/08 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704