HPF250 Series 250W Non-Inductive High Power Thick Film Resistor
250W power rating (on heat sink; base must remain below 100°C)
Non-inductive thick film construction — ideal for snubber and attenuator circuits
Resistance range: 5Ω to 1kΩ, tolerance ±10%
Chassis-mount, fin-cooled body — small and thin profile for high-density equipment
Superior vibration resistance per JIS-C-5202
Dielectric withstanding voltage: DC 5,000V for 1 minute
Insulation resistance: over 1GΩ between terminals and tab
96% aluminum oxide substrate for excellent dielectric isolation and thermal transfer
Temperature coefficient: max ±250 ppm/°C
Operating temperature range: −55°C to +125°C
What are the HPF250 Series 250W Non-Inductive High Power Thick Film Resistors?
The HPF250 is a 250W chassis-mounted thick film resistor engineered for demanding power electronics applications where both high power dissipation and non-inductive behaviour are essential. Unlike wirewound resistors — which exhibit parasitic inductance that can interfere with high-frequency switching waveforms — the HPF250 uses a thick film resistive element that presents negligible inductance, making it well suited to snubber networks, transient voltage clamp circuits, and RF attenuators operating across a wide frequency range.
The thermal design of the HPF250 centres on a 96% aluminium oxide (Al2O3) substrate interposed between the thick film element and the metal base. This ceramic layer provides the dual function of electrical isolation — delivering insulation resistance exceeding 1GΩ and a dielectric withstanding voltage of DC 5,000V for one minute — while simultaneously acting as an efficient thermal conductor that routes heat from the resistive film to the chassis-mounted fin structure. Thermal resistance from resistor surface to fin is specified at 0.1°C/W, enabling the full 250W rating when the base temperature is maintained below 100°C. The slim, flat body profile facilitates close mounting to heat sink surfaces and supports high-density panel layouts.
The HPF250 covers a resistance range of 5Ω to 1kΩ with a tolerance of ±10% (K code). The temperature coefficient of resistance is specified at a maximum of ±250 ppm/°C across the −55°C to +125°C operating range. Load life stability is rated at ±(2.0% + 0.05Ω) after 1,000 hours at rated power (1.5 hours on, 30 minutes off cycle at 25°C ambient), and moisture resistance is similarly rated at ±(2.0% + 0.05Ω) after 1,000 hours at 90–95% RH, 60°C, with 0.1× rated power applied. The unit ships with 200mm lead wires and requires a mounting torque of 15 kgf for secure chassis attachment. Single-resistor or dual-element (series/parallel) ordering configurations are supported.
HPF250 Series 250W Non-Inductive High Power Thick Film Resistor Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: HPF250
Resistor type: Power film
Description: Power thick film
Power Rating: 250W
Resistance (Ω): 5~1k
Tolerance (%): ±10
TCR (ppm/C): 250
Applications of the HPF250 Series 250W Non-Inductive High Power Thick Film Resistor
Where RARA metal clad resistors are deployed in the field.
-Snubber resistors in IGBT, MOSFET, and thyristor power converter circuits — suppressing voltage spikes during switching transients
-RF and microwave attenuator networks requiring non-inductive, high-power dissipation capability
-Transient voltage clamp and overvoltage protection resistors in high-voltage power supplies
-Dummy load and burn-in test resistors for power supply and amplifier characterisation
-High-frequency filter damping resistors in power electronics and EMC suppression circuits
-Energy discharge resistors in capacitor bank and pulsed power systems
-Motor drive and inverter braking assist resistors where low inductance is required
-High-density instrument power dissipation in compact industrial and telecom equipment
-Balancing and bleeder resistors in multi-stage high-voltage power supplies
-Precision load banks for laboratory and field testing of power conversion equipment
Related Products of the HPF250 Series 250W Non-Inductive High Power Thick Film Resistor
Model: TPX600L
Resistor type: Power film
Description: Chassis mounted
Power Rating: 600W
Resistance (Ω): 10~1k
Tolerance (%): ±5
TCR (ppm/C): 50
Model: TPK600, TPK900
Resistor type: Power film
Description: Chassis mounted
Power Rating: 600W, 900W
Resistance (Ω): 10~1.6k
Tolerance (%): ±5
TCR (ppm/C): 50
Model: TPU
Resistor type: Power film
Description: Chassis mounted
Power Rating: 300W, 600W, 800W
Resistance (Ω): 4.7~500M
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 50-250.
Model: TPM150~600
Resistor type: Power film
Description: Chassis mounted
Power Rating: 150W~600W
Resistance (Ω): 0.1~1M
Tolerance (%): ±5
TCR (ppm/C): 100
Why Choose RARA Metal Clad Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Automotive Qualified
AEC-Q200 tested models and IATF 16949 certification for EV and automotive powertrain applications. Trusted by GM Korea, Tesla, and Proterra.
02
STEP Files Included
3D STEP files available for core models, supporting ECAD/MCAD integration and thermal management simulation in your design workflow.
03
Wide Power Range
A single product family spanning 10W to 8.5kW means you can source across a project from one qualified, certified supplier.
04
Global Track Record
Deployed by Siemens, Rockwell, Toshiba, Schneider Electric, LG, and Hanwha — a customer list built on decades of consistent performance.
