low-profile Power TO220 Resistors (RMG50)

low-profile Power TO220 Resistors (RMG50)

Direct's low profile TO-220 heat sinkable resistor keeps its cool.

Providing design engineers with an open screened substrate device for applications requiring superior thermal performance, Direct Electronics has developed a non-moulded power resistor rated up to 50W.

Designated the RMG50 Series, the resistor is housed in a TO-220 opened screened substrate package, and features an insulated tapered venturi bonded to the substrate for maximum heat dissipation. The design of the RMG50 Series resistor allows for three methods of heat dissipation, resulting in exceptional power handling characteristics.

The chimney-shaped tapered venturi is attached to the ceramic substrate and convection forces hot air up the 'neck' of the chimney and away from the resistor face of the component.

The power resistor utilises all three methods of heat dissipation, including conduction through the heatsink tab, radiation from the resistor surface, and convection through the venturi element. Typical applications for the RMG50 resistor include higher wattage switch-mode power supply circuits, motor control and drive circuits, inverters and industrial power equipment.

Resistance ranges from 0.05Ω to 10KΩ, with tolerances of ±0.50% and ±10% and operating temperature range is -65°C to +150°C. The RMG50 Series TO-220 provides customers requiring more wattage in a smaller package with an excellent alternative.

Direct Electronics will also produce devices outside these specifications to meet customer requirements, with comprehensive application engineering and design support available for customers worldwide. Contact us with your specific needs. Download PDF Specification Low Profile TO220 Resistor (RMG50).

Features :
  1. Electrically Isolated Case.
  2. TO-220 Style Power Package.
  3. Low ohm value, non-inductance design
  4. Molded Case for Protection and Easy to Mount.
  5. 50 Watt at 25°C Case Temperature Heat Sink Mounted.
Applications :
  1. UPS.
  2. Voltage Regulation.
  3. Pulsing applications.
  4. Switching Power Supplies.
  5. Non-inductive design for high frequency.
Dimensions (Unit: mm) (RMG50) TO-220
TO220 Heat Sinkable Resistors (RMG50)
Dimensions (Unit: mm)
Type W H T T1 T2 B B1 C D D1
RMG50 10.15
Electrical Characteristics Specifications (RMG50) TO-220
Resistance Range Resistance Tolerance TCR(PPM/°C)
0.05Ω~1Ω ±5.00%
2Ω~5Ω ±1.00%
5Ω~10Ω ±1.00%
11Ω~10KΩ ±0.50%
Operating Voltage: 350V Max. Dielectric Strength: 1800VAC
Insulation Resistance: 10GΩmin. Working Temperature Range: -65°C to +150°C
Resistance Value < 1Ω is Available
Environmental Characteristics (RMG50) TO-220
Test Item Specification Test Method
Temperature Coefficient of Resistance 10Ω and above, ±50ppm/°C
1Ω and 10Ω, (±100ppm)/°C
Referenced to 25°C, ΔR taken at +105°C
Short Time Overload Δ R±0.3% 2 times rated power with applied voltage not to exceed 1.5 times maximum continuous operating voltage for 5 seconds.
Load Life Δ R±1.0% MIL-R-39009,2,000 hours at rated power.
Humidity (Steady State) Δ R±0.5% MIL-STD-202F, Method 103B
40°C, 90~95%RH, RCWV 1.5hours ON, 0.5hours OFF. total 1000~1048 hours.
Thermal Shock Δ R±0.3% MIL-STD-202, Method 107G.
-65°C~150°C,100 cycle
Terminal Strength Δ R±0.2% MIL-STD-202, Method 211, Cond.A(Pull Test) 2.4N.
Vibration, High Frequency Δ R±0.2% MIL-STD-202, Method 204, Cond.D.
Lead Material: Tinned Copper. Maximum Torque: 0.9 Nm.
Without a Heat Sink, When in Free Air at 25°C, the RMG50 is Rated for 3W.
The Case Temperature is to be used for the Definition of the Applied Power Limit.
The Case Temperature Measurement Must be Made with a Thermocouple Contacting the Center of the Component Mounted on the Designed Heat Sink.
Thermal Grease Should be Applied Properly.
Power Derating Curve (RMG50) TO-220
(RMG50) Power Derating Curve
(RMG50) Power Derating Curve
Order Codes (RMG50) TO-220
RMG 50 J P D 10R
Part Number
Power Rating (W)
Resistance Tolerance (%)
D ±0.5%
F ±1%
G ±2%
J ±5%
K ±10%
T Tube
P Bulk
D ±50PPM/°C
E ±100PPM/°C
F ±200PPM/°C
- No specified
Resistance (Ω)
0R1 0.1Ω
10R 10Ω
1K 1KΩ
10K 10KΩ