MFR Series Precision Metal Film Leaded Resistors
Precision metal film resistive element on high-purity ceramic core
Power rating 1/8W to 3W
Resistance range 1Ω to 10MΩ
Tolerance options ±0.05%, ±0.1%, ±0.25%, ±0.5%, and ±1%
Ultra-low TCR ±5 to ±10 ppm/°C
Axial leaded through-hole package — compatible with standard PCB insertion and auto-insertion equipment
Hot tin-dipped copper wire terminations meeting IEC 60115-1 solderability requirements
Moisture-resistant, high dielectric strength body coating
RoHS compliant and halogen free
Operating temperature range −55°C to +155°C
What are the MFR Series Precision Metal Film Leaded Resistors?
The MFR Series is a family of precision axial leaded resistors built on a high-purity ceramic core with a precisely controlled metal alloy film deposited by sputtering. This construction produces a resistive element with inherently low noise, excellent long-term stability, and a very tight temperature coefficient of resistance — characteristics that make the MFR suitable for demanding signal-level circuits where resistance accuracy and drift directly affect system performance.
The resistance range spans 1Ω to 10MΩ, with power ratings from 1/8W to 3W in standard body sizes. Tolerance options of ±0.05%, ±0.1%, ±0.25%, ±0.5%, and ±1% provide a progression from high-precision reference grades down to general-purpose precision levels, all within the same product family and mounting footprint. The temperature coefficient of resistance ranges from ±5 ppm/°C to ±10 ppm/°C depending on selected grade, ensuring that resistance values remain stable across the operating temperature range from −55°C to +155°C.
The body is protected by a moisture-resistant coating with high dielectric strength, applied so that the termination areas remain fully exposed for reliable soldering. Terminations are hot tin-dipped copper wire that meet the strength and solderability requirements of IEC 60115-1. The coating and marking system is resistant to standard industrial PCB cleaning solvents, supporting use in assemblies subject to flux cleaning processes.
The axial leaded format is compatible with manual PCB assembly, auto-insertion equipment, and a wide range of lead forming options including standard, FT, FK, AVIsert, PANAsert, and MT types, allowing the MFR to be specified across prototype, pilot, and volume production environments without component change. Multiple tape-and-reel and bulk packaging options are available to suit different assembly line requirements.
Long-term stability under load is a key design criterion. The MFR is engineered to maintain its resistance value within specification over thousands of hours of continuous operation, not only at initial measurement. This distinguishes precision-grade metal film types from general-purpose carbon film resistors, which tend to exhibit greater resistance drift over time and temperature cycling. The MFR Series is RoHS compliant and halogen free.
MFR Series Precision Metal Film Leaded Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: MFR
Resistor type: Precision
Description: Leaded metal film
Power Rating: 1/8W~3W
Resistance (Ω): 1~10M
Tolerance (%): ±0.05~±1
TCR (ppm/C): 5~10
Applications of the MFR Series Precision Metal Film Leaded Resistors
Where RARA precision resistors are deployed in the field.
Precision voltage dividers and reference circuits — stable resistance ratios for ADC reference, DAC scaling, and regulated power supply feedback networks
Instrumentation amplifier input networks — matched resistance pairs for differential and bridge circuit inputs requiring low offset and low drift
Op-amp feedback and gain-setting networks — stable gain and offset values in signal conditioning circuits, filter stages, and PID controller implementations
Medical instrumentation and diagnostic equipment — patient monitoring, infusion pumps, and analytical instruments requiring high accuracy and long-term resistance stability
Current sensing and measurement circuits — shunt networks and Wheatstone bridge configurations for accurate current and power measurement
Telecommunications and data communications equipment — line termination, impedance matching, and signal attenuation networks
Test and measurement instruments — load resistors, attenuator pads, and reference networks in bench and automated test equipment
Automotive electronics — AEC-Q200 qualified variants for sensor signal conditioning, ADAS circuits, and powertrain control modules
Industrial automation and process control — transmitter input circuits, 4–20mA loop components, and programmable controller analog modules
Defense and aerospace electronics — avionics, guidance, and communication systems requiring stable resistance over extended temperature ranges from −55°C to +155°C
Related Products of the MFR Series Precision Metal Film Leaded Resistors
Model: 5G10
Resistor type: Precision
Description: Wire wound
Power Rating: 0.2W
Resistance (Ω): 10~200k
Tolerance (%): ±0.01, ±0.1
TCR (ppm/C): 3
Model: MFD
Resistor type: High precision
Description: Leaded metal film
Power Rating: 1/4W, 1/2W
Resistance (Ω): 10~1M
Tolerance (%): ±0.02, ±0.05, ±0.1
TCR (ppm/C): 5~25
Model: AX
Resistor type: Precision
Description: Wire wound
Power Rating: 1W
Resistance (Ω): 1~400k
Tolerance (%): ±0.01, ±0.05, ±0.1
TCR (ppm/C): 10~15
Model: CE-CL-T
Resistor type: Precision
Description: Wire wound
Power Rating: 1/8W~1W
Resistance (Ω): 0.1~1.5M
Tolerance (%): ±0.01~±0.1
TCR (ppm/C): 5~90
Why Choose RARA Precision Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Extreme Accuracy
Tolerances as tight as ±0.005% and TCR as low as 3 ppm/°C — across metal film, thin film chip, wire wound, and MELF construction types to suit every precision circuit requirement.
02
Long-Term Stability
Precision resistors are only useful if they stay accurate. RARA precision types are engineered for extended load life — maintaining resistance within specification over thousands of hours of operation.
03
Full Technology Range
From 1/32W SMD thin film chips to 50W high-power precision wire wound types — one precision resistor family covering every power level and form factor from a single ISO-certified supplier.
04
Global Track Record
Trusted by Toshiba, Siemens, Rockwell, LG, and Schneider Electric — deployed in instrumentation, medical, and industrial measurement systems across six continents.
