TO-220 Precision Power Resistors


Tokenchina providing design engineers with an open screened substrate device for applications requiring superior thermal performance, 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 power RMG20 resistor is rated for 20W power dissipation and utilises all three methods of heat dissipation, including conduction through the heatsink tab, radiation from the resistor surface, and convection through the venturi element.

The TO-220 power RMG20 series is lead-free and RoHS compliant. Contact our sales representative for more information.

Heat Sink power resistors


  • 20 Watt at 25°C Case Temperature Heat Sink Mounted.
  • Molded Case for Protection and Easy to Mount.
  • Excellent High Frequency Characteristics.
  • Precision Tolerances Tight to ±0.5%.
  • TO-220 Style Power Package.
  • Non-Inductive, Isolated Case.


  • Electronic Ballast: Ignition, Switching Spark Circuit
  • High Speed Switching Power Supplies.
  • Load Resistor for Pulse Generators.
  • RF Power Sources, Voltage Regulation.
  • VHF Amplifiers, RF Linear Amplifiers.
  • Snubber Circuits.

TO220 Derating Curve & Dimensions (Unit: mm) - Precision Power RMG20

TO-220 Power Resistors Dimensions TO-220 Power Resistors Derating Curve
Type W H T T1 T2 B B1 C D D1
RMG20 10.15~10.67 16.00~16.52 2.92~3.44 0.40~0.60 1.52~2.04 11.43~13.97 2.54~4.06 4.82~5.34 0.66~0.86 1.14~1.40

TO220 Electrical Specifications - Precision Power RMG20

Resistance Range Resistance Tolerance TCR(PPM/°C)
0.05Ω~1Ω ±5.00%
2Ω~5Ω ±1.00%
5Ω~10Ω ±1.00%
11Ω~10KΩ ±0.50%
  • Working Temperature Range:-65°C to +150°C
  • Resistance Value < 1Ω is Available
  • Insulation Resistance: 10GΩmin.
  • Operating Voltage:350V Max.
  • Dielectric Strength: 1800VAC

TO220 Environmental Characteristics - Precision Power RMG20

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.
  • Thermal Grease Should be Applied Properly.
  • Without a Heat Sink, when in Free Air at 25°C, the RMG20 is Rated for 2.25W.
  • 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.
  • Lead Material: Tinned Copper.

TO220 How to Order - Precision Power RMG20

RMG 20 J P D 1001
Product Type
Power Resistors
Power Rating
20 Watts
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
0R10 0.1Ω
0100 10Ω
4700 470Ω
1001 1000Ω
1002 10000Ω

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RMG20 Series - TO-220 Precision Power Resistor