UHV Series High Voltage and High Ohm Resistors
High voltage and high ohm resistor in compact axial body
Six models across two sub-families: standard (UHV1, UHV2, UHV3) and precision (UHV1P, UHV2P, UHV3P)
Standard sub-family power ratings 1W, 2W, and 3W at 25°C; precision sub-family 0.5W, 1W, and 2W
Maximum working voltage 3kV to 14kV depending on model
Standard sub-family resistance range 10kΩ to 2GΩ; precision sub-family 1kΩ to 500MΩ
Standard sub-family TCR ±100 ppm/°C or ±500 ppm/°C (25°C to 85°C)
Precision sub-family TCR ±25 ppm/°C or ±50 ppm/°C (25°C to 85°C)
Tolerance options ±1%, ±2%, ±5%, and ±10% depending on sub-family
Voltage coefficient ≤20 ppm/V
Operating temperature range −55°C to +150°C
Insulation resistance 10 GΩ minimum
Load life ΔR ≤0.5% after 1000 hours
Short time overload ΔR ≤0.5% at 5 times rated power for 3 seconds
RoHS compliant
What are the UHV Series High Voltage and High Ohm Resistors?
The UHV series is a range of high voltage, high ohm resistors in a compact axial body, designed to serve applications spanning from general-purpose high voltage circuitry through to the highest-reliability requirements of precision X-ray systems and high voltage generators. The series is structured across two distinct sub-families to address these differing demands. The standard sub-family — UHV1, UHV2, and UHV3 — covers power ratings of 1W, 2W, and 3W at 25°C, with maximum working voltages of 3kV, 4kV, and 14kV respectively, resistance values from 10kΩ to 2GΩ, and TCR options of ±100 ppm/°C or ±500 ppm/°C. The precision sub-family — UHV1P, UHV2P, and UHV3P — shares the same voltage and power envelope but targets tighter performance, with TCR options of ±25 ppm/°C or ±50 ppm/°C, tolerances down to ±1% or ±2%, and resistance values from 1kΩ to 500MΩ.
A key electrical parameter of the UHV series is its voltage coefficient of ≤20 ppm/V, which quantifies the change in resistance as a function of applied voltage rather than temperature. At high resistance values and elevated working voltages this effect becomes significant, and resistors that do not control voltage coefficient will exhibit apparent resistance changes as supply voltage varies, introducing errors into divider ratios, feedback networks, and measurement circuits. The UHV series specification of ≤20 ppm/V ensures that resistance remains stable across the operating voltage range, complementing the TCR specification and making the series suitable for precision applications where both thermal and voltage-induced drift must be controlled. All models operate across −55°C to +150°C with an insulation resistance of at least 10 GΩ.
The UHV series body dimensions are compact relative to the voltages handled: the UHV1 and UHV1P are 16mm maximum length at 5mm diameter, the UHV2 and UHV2P are 22mm, and the UHV3 and UHV3P extend to 42mm for the 14kV-rated models. This controlled physical geometry, combined with the choice between standard and precision TCR grades, allows the series to be specified across a wide range of system types without requiring a change of form factor. Load life drift is ΔR ≤0.5% after 1000 hours of continuous operation, and short time overload performance is ΔR ≤0.5% at five times rated power for three seconds, confirming robustness under both steady-state and transient stress conditions.
UHV Series High Voltage and High Ohm Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: UHV
Resistor type: High Voltage
Description: High Voltage and Ohm
Power Rating: 0.5W~3W
Supply voltage: 3kV~14kV
Resistance (Ω): 1K~2G
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 25~500
Applications of the UHV Series High Voltage and High Ohm Resistors
Where RARA high voltage resistors are deployed in the field.
Precision high voltage power supplies — feedback network, voltage division, and output sensing resistors in regulated HVDC and kilovolt-range power supplies where the precision sub-family TCR of ±25 ppm/°C and ≤20 ppm/V voltage coefficient maintain output accuracy across temperature and load variation.
X-ray generators and radiographic systems — high-stability resistors in tube voltage feedback and monitoring circuits for diagnostic and industrial X-ray equipment, where the highest-reliability precision sub-family variants are appropriate for continuous clinical operation.
High voltage generators and electrostatic equipment — current-limiting, voltage-grading, and discharge resistors in Van de Graaff generators, electrostatic coating systems, and ion implantation power supplies operating at supply voltages to 14kV.
Electron microscopes and charged particle beam instruments — precision divider and bias resistors in accelerating voltage and deflection supplies where voltage coefficient and TCR directly affect beam stability and image resolution.
High voltage test and calibration instruments — stable high-impedance reference and divider elements in high voltage probes, dielectric testers, and calibration sources where resistance accuracy across voltage and temperature is a primary specification requirement.
Medical imaging and radiation therapy equipment — high value sensing and limiting resistors in the kilovolt power stages of CT scanners, linear accelerators, and radiotherapy beam control systems demanding long-term load life stability.
Industrial plasma and surface treatment systems — current-controlling and voltage-dividing elements in corona discharge, plasma cleaning, and dielectric barrier discharge equipment where compact axial packaging is preferred alongside high voltage standoff.
Power conversion and energy storage monitoring circuits — high-impedance voltage sensing and bleed resistors in solar inverters, battery management systems, and capacitor bank assemblies where elevated bus voltages exceed the capability of standard axial resistors.
Related Products of the UHV Series High Voltage and High Ohm Resistors
Model: HVI
Resistor type: High Voltage
Description: Thick film Tubular
Power Rating: 1W~6W
Supply voltage: 4kV~30kV
Resistance (Ω): 100k~1G
Tolerance (%): ±1
TCR (ppm/C): 25
Model: HVE
Resistor type: High Voltage
Description: Thick film Tubular
Power Rating: 2.5W~20W
Supply voltage: 4.8kV~45kV
Resistance (Ω): 200~10G
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C): 100
Model: 400 Series
Resistor type: High Voltage
Description: Precision, Non-Inductive
Low TCR
Power Rating: 3.8W~20W
Supply voltage: 15kV~90kV
Resistance (Ω): 1k~1T
Tolerance (%): ±0.05 to ±10
TCR (ppm/C): 5, 10, 15, 25, 50, 100
Model: HVR
Resistor type: High Voltage
Description: High Voltage Tubular
Power Rating: 8W~300W
Supply voltage: 25kV~80kV
Resistance (Ω): 10~1G
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 50~1000
Why Choose RARA High Voltage Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Widest Voltage Range
From 1kV SMD chip types to 90kV precision planar resistors — RARA's high voltage lineup covers more of the voltage spectrum than virtually any single supplier.
02
Extreme Precision
The 400 Series delivers ±0.05% tolerance and 5 ppm/°C TCR — precision that rivals dedicated metrology components, available at high voltage ratings up to 90kV.
03
5 Form Factors
SMD, axial, radial, tubular, and planar configurations give design engineers the right package for board-level, through-hole, or chassis-mounted high voltage circuits.
04
Global Track Record
Trusted by Toshiba, Siemens, Rockwell, and Schneider Electric — deployed in medical, industrial, and telecom high voltage systems across six continents.
