89-SERIES Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – High power to size ratio

89 Series
Metal-Mite^® Aluminum Housed
Axial Terminal Wirewound, 1% Tolerance
The 89 Series is a high-performance axial type
resistor. These molded-construction metal-housed
resistors are available in higher power ratings than
standard axial resistors and are better suited to with-
standing 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.
F e at u r e s
• High Stability: ±0.5% ∆R
• High power to size ratio
• Metal housing allows chassis mounting and pro-
vides heat sink capability
Series specifications
Series Wattage
Ohms
Voltage
805
5
0.10-25K
210
810
10
0.10-50K
320
825
25
0.010-75K
520
850
50
0.005-100K 1170
Non-Inductive versions available. Insert “N” before tolerance code.
Example: 850NF560
Characteristics
Housing Metal, anodized aluminum
Internal Coating Silicone
Core Ceramic
Terminals Solder-coated axial
Derating Linearly from 100% @ +25°C to 0% @ +275°C.
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 1Ω: ±90 ppm/°C; 1 to 9.99Ω: ±50 ppm/°C; 10Ω and over: ±20 ppm/°C.
Dielectric withstanding voltage 5W and 10W rating,1000 VAC; 25 and 50W ratings, 2250 VAC.
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1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
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