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89 Series

Metal-Mite®Aluminum Housed Axial Terminal Wirewound
1% Tolerance

RoHS compliant
As of September 2006, the 89 Series is no longer offered as Mil. Spec.

SeriesWattageOhmsVoltage
80550.10-25K210
810100.10-50K320
825250.005-75K520
850500.005-100K1170
Non-Inductive versions available. Insert "N" before tolerance code. Example - 850NF560

RoHS compliant product available Jan. 2006 Add "E" suffix to part number to specify.

The 89 Series is a high-performance axial-terminal type resistor. These molded-construction metal-housed resistors are available in higher power ratings than standard axial-terminal resistors and are better suited to withstanding vibration, shock and harsh environmental conditions.

The 89 Series Metal-Mite® resistors are aluminum housed to maintain high stability during operation and to permit secure mounting to chassis surfaces. The metal housing also provides heat-sinking capabilities, allowing the units to exceed the power ratings set by MIL specifications.

FEATURES
  • High Stability: ±0.5% delta-R.
  • High power to size ratio.
  • Metal housing allows chassis mounting and provides heat sink capability.
SPECIFICATIONS

Material

  • Housing: Metal, anodized aluminum.
  • Internal Coating: Silicone.
  • Core: Ceramic.
  • Terminals: Solder-coated axial
  • Derating: Linearly from 100% @ +25°C to 0% @ +275°C.

Electrical

  • Tolerance: ±1% and ±5% (other tolerances available).
  • Power rating: Rating is based on chassis mounting area and temperature stability. Proper heat sink as follows: 5W and 10W units, 4" x 6" x 2" x .040" Aluminum chassis; 25W units, 5" x 7" x 2" x .040" Aluminum chassis; 50W units, 12" x 12" x .059" Aluminum panel.
  • Maximum ohmic values: See chart.
  • Overload: 5 times rated wattage for 5 seconds.
  • Temperature coefficient: Under 1 ohm: ±90 ppm/°C; 1 to 9.99 ohms: ±50 ppm/°C; 10 ohms and over: ±20 ppm/°C.
  • Dielectric withstanding voltage: 5W and 10W rating,1000 VAC; 25 and 50W ratings, 2250 VAC.

Power (watts)5102550
Series805810825850
Dim. A (in. ±0.062 / mm ±1.57)1.125 / 28.591.375 / 34.931.938 / 49.232.781 / 70.64
Dim. B (in. ±0.010 / mm ±0.25)0.490 / 12.450.625 / 15.880.781 / 19.840.844 / 21.44
Dim. C (in. ±0.031 / mm ±0.79)0.078 / 1.980.094 / 2.390.172 / 4.370.188 / 4.78
Dim. D (in. ±0.010 / mm ±0.25)0.444 / 11.280.562 / 14.280.719 / 18.261.562 / 39.68
Dim. E (in. ±0.062 / mm ±1.57)0.600 / 15.240.750 / 19.051.062 / 26.981.938 / 49.23
Dim. F (in. ±0.062 / mm ±1.57)0.266 / 6.760.312 / 7.930.438 / 11.130.438 / 11.13
Dim. G (in. ±0.062 / mm ±1.57)0.334 / 8.480.438 / 11.130.531 / 13.490.594 / 15.09
Dim. H (in. ±0.031 / mm ±0.79)0.245 / 6.220.312 / 7.930.391 / 9.930.422 / 10.72
Dim. J (in. ±0.031 / mm ±0.79)0.646 / 16.410.812 / 20.631.094 / 27.791.156 / 29.36
Dim. K (in. ±0.005 / mm ±0.13)0.093 / 2.360.094 / 2.390.125 / 3.180.125 / 3.18
Dim. L (in. ±0.031 / mm ±0.79)0.320 / 8.130.406 / 10.310.562 / 14.280.625 / 15.88
Dim. M (in. ±0.062 / mm ±1.57)0.133 / 3.380.203 / 5.160.281 / 7.140.312 / 7.92
Dim. N (in. ±0.031 / mm ±0.79)0.065 / 1.650.094 / 2.390.094 / 2.390.094 / 2.39
Dim. P (in. ±0.005 / mm ±0.13)0.050 / 1.270.085 / 2.160.085 / 2.160.085 / 2.16
Q min AWG16121212
Dim. R (in., min/mm, min)0.085/ 2.160.140/ 3.560.140/ 3.560.140/ 3.56

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Ohmite Mfg. Co.
1600 Golf Rd., Suite 850
Rolling Meadows, IL 60008
Tel: 1-866-9-OHMITE
(1-866-964-6483)
Int'l: 1-847-258-0300
Fax: 1-847-574-7522
info@ohmite.com
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