Product Overview
The 89 Series Metal-Mite is a high-performance, aluminum-housed axial terminal wirewound resistor designed for demanding applications. These resistors offer a high power-to-size ratio, excellent stability (0.5% R), and are built to withstand vibration, shock, and harsh environmental conditions. The metal housing facilitates chassis mounting, providing effective heat-sinking capabilities for high stability during operation. Non-inductive versions are available.
Product Attributes
- Brand: Ohmite
- Series: 89 Series Metal-Mite
- Housing Material: Anodized aluminum
- Internal Coating: Silicone
- Core Material: Ceramic
- Terminals: Solder-coated axial
- Certifications: RoHS Compliant (as of September 2006, no longer offered as Mil. Spec.)
Technical Specifications
| Series | Wattage | Tolerance | Ohmic Value Range | Temperature Coefficient | Dielectric Withstanding Voltage | Overload |
| 805 | 5W | 1%, 5% | 0.10-25K | <1: 90 ppm/C; 1-9.99: 50 ppm/C; 10: 20 ppm/C | 1000 VAC | 5x rated wattage for 5 seconds |
| 810 | 10W | 1%, 5% | 0.10-50K | <1: 90 ppm/C; 1-9.99: 50 ppm/C; 10: 20 ppm/C | 1000 VAC | 5x rated wattage for 5 seconds |
| 825 | 25W | 1%, 5% | 0.010-75K | <1: 90 ppm/C; 1-9.99: 50 ppm/C; 10: 20 ppm/C | 2250 VAC | 5x rated wattage for 5 seconds |
| 850 | 50W | 1%, 5% | 0.005-100K | <1: 90 ppm/C; 1-9.99: 50 ppm/C; 10: 20 ppm/C | 2250 VAC | 5x rated wattage for 5 seconds |
Derating and Power Rating
Derating: Linearly from 100% @ +25C to 0% @ +275C.
Power rating is based on chassis mounting area and temperature stability. Proper heat sink requirements:
- 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
Ordering Information Example
Part Number Structure: 805NF5R0E
- Series: 805 (5 Watt), 810 (10 watt), 825 (25 watt), 850 (50 watt)
- Tolerance: F = 1%, J = 5%
- Non-Inductive Winding: Optional (insert 'N' before tolerance code, e.g., 850NF560)
- Ohmic Value: e.g., R005=0.005, R10=0.1, 1R0=1.0, 250=250, 1K0=1,000, 1K5=1,500, 25K=25,000
2411220655_Ohmite-810F5R0_C19564516.pdf
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