Precision Resistor MFL - metal foil

Metal foil precision resistor for highly stable measurement and reference circuits

The MFL series is a metal foil precision resistor for circuits where very tight tolerances, minimal temperature drift and high long-term stability are essential. The resistive elements are based on metal foil technology and are housed in an epoxy-moulded body with radial, tinned copper leads. This combines a compact through-hole package with properties that are optimized for precise measurement and reference tasks.

The resistance range extends – depending on style – up to 200 kΩ and already starts in the low-ohmic range. Resistance tolerances down to ±0.01% and temperature coefficients from ±2.5 ppm/°C enable very accurate operating points in measurement amplifiers, bridge circuits, reference branches or precision divider networks. The rated power of 0.125 W or 0.25 W @ 70 °C is tailored to signal and measurement applications where low power dissipation but high accuracy are required.

A key characteristic of the series is its very high long-term stability: even at rated load and 70 °C, typical resistance changes after 1000 hours are only around ±0.01%. Additional tests such as short-time overload, temperature cycling, high-temperature exposure, damp heat, soldering heat, shock and vibration keep resistance changes within the 10-4 to 10-3 range. The low current noise (typ. −42 dB) supports clean signal transmission, especially in low-noise amplifiers, precise sensor paths and sensitive measurement channels.

This makes the MFL series particularly suitable for measurement and reference circuits, precision amplifier networks, bridge circuits, A/D front ends and calibrated dividers, where a combination of tight tolerances, low TCR, high long-term stability and low noise is critical.

Options

• Sizes:
  • MFL 501 (values up to 100 kΩ)
  • MFL 502 (values up to 150 kΩ)
  • MFL 503 (values up to 200 kΩ)
• Resistance range by style:
  • 5 Ω…100 kΩ (MFL 501)
  • 1 Ω…150 kΩ (MFL 502)
  • 1 Ω…200 kΩ (MFL 503)
• Resistance tolerances:
  • from ±1% down to ±0.01% (depending on style and resistance value, graded ranges per series)
• Temperature coefficients:
  • TK2.5 (±2.5 ppm/°C) or TK5 (±5 ppm/°C)
• Lead spacing:
  • 2.54 mm or 5.08 mm, radial leads (depending on style)
• Resistance values:
  • freely selectable values within 10 Ω up to the respective maximum for each style, marked (in xxxkxxx notation e.g. 10k100)