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 robust construction suitable for vibration, shock, and harsh environments. The metal housing provides chassis mounting capability and effective heat sinking, ensuring high stability during operation.
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)
Technical Specifications
| Series | Wattage | Tolerance | Resistance Range (Ohms) | Non-Inductive Option | Temperature Coefficient | Dielectric Withstanding Voltage | Overload Rating |
| 805 | 5W | 1%, 5% | 0.10 - 25K | Insert 'N' before tolerance code (e.g., 805NF5R0E) | <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 | Insert 'N' before tolerance code | <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 | Insert 'N' before tolerance code | <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 | Insert 'N' before tolerance code | <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: Based on chassis mounting area and temperature stability. Requires specific heat sink dimensions:
- 5W & 10W: 4 x 6 x 2 x .040 Aluminum chassis
- 25W: 5 x 7 x 2 x .040 Aluminum chassis
- 50W: 12 x 12 x .059 Aluminum panel
Ohmic Value Availability
Standard and non-standard ohmic values are available. Non-standard values may be subject to a minimum handling charge. Shaded values (in source document) involve very fine resistance wire and should not be used in critical applications without burn-in and/or thermal cycling.
Ordering Information Example
Part Number Structure: Series Wattage Ohms Tolerance Non-Inductive Ohmic Value
Example: 805NF5R0E
- Series: 805 (5 Watt)
- Tolerance: F (1%)
- Non-Inductive: N (Optional)
- Ohmic Value: 5R0 (5.0 Ohms)
Note: Dimensions have changed as of August 2015. The 89 Series is no longer offered as Mil. Spec. as of September 2006.
2411220655_Ohmite-825F7R5_C19606316.pdf
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