OT Aluminum Chassis Power,
Non-Inductive Thick Film Resistors
Thick film Non-Inductive Aluminum Housed type OT Series
The OT Series are high-performance axial-lead type resistors. The molded construction, metal housed resistors are available in higher power ratings than standard axial-lead resistors and are better suited to withstand vibration, shock and harsh environmental conditions. The OT Series 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.
SPECIFICATIONS
Material Electrical
High Stability: ± 0.5% delta-R.
High power to size ratio.
Metal housing allows chassis mounting and provides heat sink capability.
Housing: Metal, anodized aluminum.
Internal Coating: Silicone.
Core: Ceramic.
Terminals: Solder-coated axial lead.
Derating: Linearly from 100% @ + 25°C to 0% @ + 275°C
Tolerance: 1, 2, & 5% (other tolerances available)
Power Rating: Rating is based on chassis mountaing area and temperature stability.
Maximum ohmic values: See specifications below
Overload: 5 times rated wattage for 5 seconds.
Temperature coefficient: TCR 100/ppm °C typ.
Dielectric withstanding voltage: 25 and 50W ratings, 2250 VAC
DIMENSIONS & SPECIFICATIONS [mm}
Series Wattage
@ 25°C		 Ohms
 Max. Working
Voltage K.V.		 R F C A B N
OT25 25 2 to 1,000Meg 2.0 49 29.5 27.2 18.3 19.8 2
OT50 50 2 to 1,000Meg 2.0 71 29.5 49.2 39.7 21.4 2
Dimensions
Derating Curve
ORDERING INFORMATION
Example: 25w 10 meg 5%
OT25
10 m
J
Type
Resistance
Tolerance
F = 1%
G = 2%
J = 5%
product guide
TO ORDER PRODUCTS
E mail: microohm@mail.com
Call Toll Free: 1-800-845-5167