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Resistor High Power Low Inductance

This specific product line is not for new designs. The RHX Series of ultra-precision resistors is manufactured with either thin or thick film technology based on resistance value. Encased in traditional transistor packaging to maximize heat transfer, our ultra-high precision resistors have been optimized in the widely used standard transistor packages TO-220 and TO-247.
Resistances are available from 0.02 Ohm up to 51k Ohm. This series features high power ratings of 35, 50 and 100 Watts. These power ratings combined with the small, thin profile design makes these pulse withstanding resistors an excellent choice for your high density, compact applications. Circuit designs with high stability requirements will benefit from the low resistance drift (Low TCR) of these ultra-high precision resistors.
Contact us for special requirements.
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Electrical Characteristics

Electrical Characteristics RHXH1 & RHXH2 Values RHXH3 Value
Maxiumum Current 25A -
Inductance <10nH (At the Standoff) -
Insulation Resistance >1000 Megohm >1000 Megohm
Dielectric Strength 2000 VAC 2500 VAC
Temperature Range -55°C to +155°C -55°C to +175°C
Maximum Working Voltage Maximum Working Voltage Calculation for RHXH1 & RHXH2 Values Maximum Working Voltage Calculation for RHXH3 Value

RHXH1 & RHXH2 POWER RATING NOTES:

  • H1 and H2 High Power Low Inductance Resistors must be attached to a suitable heatsink. Without a heatsink, the maximum power rating is 1W.
  • The maximum internal resistor temperature is 155°C.
  • Use the following formula to specify an appropriate heatsink:

RHXH3 POWER RATING NOTES:

  • H3 High Power Low Inductance Resistors must be attached to a suitable heatsink.
  • The maximum internal resistor temperature is 155°C.
  • Use the following formula to specify appropriate heatsink:

RHXH1 & RHXH2

MOUNTING NOTES:

  • H1 and H2 High Power Low Inductance Resistors must be attached to a suitable heatsink.
  • Use thermal grease to mount resistor to a clean, flat surface.
  • Use a compression washer to provide 150 to 300 pounds ( 665 to 1330N ) of mounting force.
  • Torque mounting screw to 8 in-lbs ( 0.9 N-m ).
  • Mounting tab is isolated from both pins.

RHXH3

MOUNTING NOTES:

  • H3 High Power Low Inductance Resistors must be attached to a suitable heatsink.
  • Use thermal grease to mount resistor to a clean, flat surface.
  • Use a compression washer to provide 150 to 300 pounds ( 665 to 1330N ) of mounting force.
  • Torque mounting screw to 8 in-lbs ( 0.9 N-m ).
  • Back plate is isolated from both pins.

Packaging Information

  Triangle symbolR  
Environmental Performance RHXH1 RHXH2 RHXH3 Test Conditions
Humidity Resistance ±1% + 0.05Ω 40°C, 90-95% RH, DC 0.1W, 1000 hr
Load Life ±1% + 0.05Ω 25°C, 90 min ON, 30 min OFF, 1000 hr
Temperature Cycle ±0.25% + 0.05Ω -55°C for 30 min, +155°C for 30 min, 1000 hr
Vibration ±0.25% + 0.05Ω IEC60068-2-6
Solder Heat ±0.1% + 0.05Ω +350°C, 3s

* Moisture Sensitivity Level: MSL-1

Available Options (Consult Factory)

  • Special Testing Requirements

KEY FEATURES:

  • Resistances from 0.02 to 51K Ohms
  • High Stability Film Resistance Elements
  • Rated Power of 35, 50 and 100 Watts
  • TO-220 and TO-247 Housing
  • Resistance tolerance of ± 0.1% or ± 1%
  • Low Inductance of <10nH for RHXH1 and RHXH2; <50nH for RHXH3
  • RoHS Compliant

APPLICATIONS:

  • Power Inverters
  • Power Supplies
  • Engine Sensors
  • Temperature Sensors

PRODUCT SUMMARY:
PRODUCT SERIES (RHX) RESISTANCE RANGE (Ω) 3 POWER RATING (W) THERMAL RESISTANCE TOLERANCES
MIN MAX HEATSINK 1 FREE AIR 2
RHXH1 0.02 51K 35 1 3.3°C/W ± 1% (R≥0.1Ω) ± 5%
RHXH2 0.02 51K 50 1 2.3°C/W ± 1% ( R≥0.1Ω) ± 5%
RHXH3 0.02 51K 100 3 1.3°C/W ± 1% ( R≥0.10Ω ) ± 5%

TEMPERATURE COEFFICIENTS:

  • ± 50ppm/°C ( R≥10Ω )
  • ± 100ppm/°C ( 0.1Ω ≤ R < 10Ω )
  • ± 250ppm/°C ( R < 0.1Ω )

1 Power Rating based on 25°C Flange Temperature
2 Power Rating based on 25°C Ambient Temperature
3 Contact Factory for Higher or Lower Values