High-Voltage Resistors TC of ±25ppm/°C

Resistors operating at high temperatures have strict requirements for temperature coefficients and exhibit high stability. A low temperature coefficient minimizes changes in ohmic value due to thermal dissipation. Typical applications include medical systems such as X-ray and MRI imaging, as well as power supplies for instruments.

Product Features

• Standard: ±1% to ±10%

• Special Requirements (Low Ohm Values): ±0.1% to ±0.5%

• Temperature Coefficient: ±25 ppm/°C (referenced at 25°C, measured between -15°C and +85°C; lower for special low ohm value requirements)

• Max. Operating Temperature: +225°C

• Voltage Coefficient: -0.2 ppm/V max. (as per MIL-Std-202, Method 309, 10 kV DC max.)

• Dielectric Strength: 1,000 V DC

• Insulation Resistance: 10 GΩ min. at 1,000 V DC

• Overload/Overvoltage: 5 times rated power with applied voltage not exceeding 1.5 times the maximum continuous operating voltage for 5 seconds, ΔR 0.20% max.

• Load Life: 1,000 hours at rated voltage without exceeding rated power, typical ΔR(S) = 0.1%, ΔR0 = 0.25%

• Load Life Stability: ±0.25% per 1,000 hours at +125°C

• Moisture Resistance: MIL-Std-202, Method 106, ΔR 0.4% max.

• Thermal Shock: MIL-Std-202, Method 107, Condition B, ΔR 0.20% max.

• Encapsulation: Standard coating is silicone rubber; 2-component epoxy coating is recommended for oil immersion and wave soldering applications (inquire for details)

• Lead Material: OFHC copper, tin-plated

• Weight: Determined by parameters (inquire for details)

* If you need very tight tolerances (±0.1 % to ±0.5 %), we recommend not to use the full power rating but rather to select the next large size to achieve ultimate stability (ask for details)