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What is the temperature coefficient (TCR) of HVC high voltage resistors?
HVC Capacitor's high voltage thick film resistors achieve industry-competitive Temperature Coefficient of Resistance (TCR) values optimized for stable operation across wide ambient temperature ranges encountered in industrial, medical, and outdoor smart grid deployments.
| HVR Series | Resistance Range | TCR (Typical) | TCR (Maximum) | Test Conditions |
| HVR-GFP/GXP | 200Ω – 10MΩ | ±50 ppm/°C | ±100 ppm/°C | -55°C ~ +125°C |
|---|---|---|---|---|
| HVR-GFP/GXP | 10MΩ – 100MΩ | ±80 ppm/°C | ±150 ppm/°C | +25°C ~ +105°C |
| HVR-GFP/GXP | 100MΩ – 2GΩ | ±80 ppm/°C | ±200 ppm/°C | +25°C ~ +105°C |
| HVR-BSP/BOP | 1MΩ – 100MΩ | ±80 ppm/°C | ±150 ppm/°C | -25°C ~ +125°C |
| HVR-BSP/BOP | 100MΩ – 10GΩ | ±100 ppm/°C | ±200 ppm/°C | +25°C ~ +105°C |
| HVR-Precision (Custom) | Per request | ±20 – ±50 ppm/°C | Per spec | Negotiated |
Example: Voltage Divider Network for Smart Grid FTU (50kV / 1000:1 ratio)
Using two 10GΩ resistors (upper arm) with different TCR values:
| Scenario | Upper Arm TCR | Lower Arm TCR | Divider Ratio Drift (-25°C to +85°C) |
| Competitor Grade A | ±200 ppm/°C | ±50 ppm/°C | ±2.2% error (unacceptable) |
|---|---|---|---|
| HVC HVR-GXP | ±80 ppm/°C | ±50 ppm/°C | ±1.04% error (acceptable) |
| Matched Pair Option | ±80 ppm/°C (tracked) | ±80 ppm/°C (tracked) | ±0.16% error (excellent) |
Conclusion: HVC's ±80 ppm/°C TCR for high-value resistors enables 2x better accuracy stability than typical competitor ±150-200 ppm/°C specifications in precision divider applications.
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