Precision Resistor NC550 - metal film

Versatile metal film precision resistor for switching, control and measurement tasks

The NC550 precision resistors are designed for applications where stable characteristics, low temperature drift and low noise are required. Metal film technology on an alumina substrate with epoxy encapsulation results in a resistor that can be used reliably in precise analogue circuits – from simple signal paths up to sensitive measurement amplifiers. Thanks to their low-noise behaviour, NC550 resistors have established themselves over many years as a standard solution in switching, control and measurement circuits.

The resistance range from 1 Ω to 5 MΩ allows use in current sensing paths, voltage dividers and reference networks alike. With resistance tolerances down to ±0.05%, circuits can be dimensioned accurately without complex trimming. A temperature coefficient from ±3 ppm/°C (depending on version up to ±50 ppm/°C) ensures that the resistance value drifts only slightly over the specified temperature range. The power rating is 0.6 W at 40 °C or 0.4 W at 70 °C, with a maximum working voltage of 300 V.

To assess long-term behaviour, the datasheet specifies extensive tests, including short-time overload, load life up to 10,000 h, temperature cycling, damp heat and resistance to soldering heat. The permissible resistance changes remain within a few tenths of a percent, making NC550 resistors suitable for continuously operated measurement and control circuits. An optional low-inductance version reduces parasitic inductance in the signal path, while the “pre-loaded @ 100 h rated power” option further improves stability after assembly.

Options

• Resistance values: 1 Ω–5 MΩ, freely selectable intermediate values in standard notation (e.g. 10k000, 10k200)
• Resistance tolerances: ±0.1%, ±0.05% (depending on resistance value and version)
• Temperature coefficients: from ±3 ppm/°C up to ±50 ppm/°C, depending on resistance value
• Low-inductance version to minimize parasitic inductance (option)
• Pre-loaded version: pre-loaded @ 100 h rated power to further improve long-term stability (option)
• Supplied on tape (tape / ammo pack) or in bulk to support different assembly and logistics concepts