TNP10P, TNP20P Series Heatsinkable Precision Power Film Resistors
Precision power film resistive element on TO-126 heatsinkable package
10W rated power on heatsink — 1W rated power in free air
Resistance range 0.1Ω to 51kΩ
Non-inductive film construction — suitable for high-frequency and high-speed circuits
Single-screw tab mounting for direct heatsink attachment
Low thermal resistance to heatsink — efficient heat transfer under full load
Low noise construction — suitable for precision signal and measurement circuits
Tolerance options ±0.05% and ±1%
TCR options 5, 10 and 25 ppm/°C
High-density installation — compact TO-126 body alongside standard power semiconductors
What are the TNP10P, TNP20P Series Heatsinkable Precision Power Film Resistors?
The TNP10P and TNP20P are precision power film resistors in a TO-126 heatsinkable package, bridging the gap between the low-power precision resistors used in measurement and signal-conditioning circuits and the high-power resistors used in energy dissipation and power control. Where conventional signal-level precision resistors are limited to fractions of a watt and high-power resistors typically sacrifice accuracy, the TNP10P/20P series combines a tolerance as tight as ±0.05% and TCR options down to 5 ppm/°C with a continuous power rating of 10W when mounted on a suitable heatsink. This makes the series the appropriate choice for any application requiring both resistance accuracy and meaningful power dissipation in a single compact component.
The TO-126 package features a metal mounting tab with a single-screw fixing point that provides direct thermal coupling to an external heatsink. The film construction of the resistive element is inherently non-inductive, which is a significant advantage over wire wound alternatives in high-frequency and high-speed circuit applications. Where wire wound resistors introduce inductive reactance that increases impedance at higher frequencies, the planar film element of the TNP10P/20P presents a purely resistive impedance across the frequency range of interest in switching power supplies, motor drive circuits, and high-speed measurement loops. The low-noise film construction additionally makes the series suitable for precision analogue circuits where resistor noise would be an unwanted contribution to the circuit noise floor.
The resistance range spans 0.1Ω to 51kΩ, covering current sensing at low values, general precision feedback and gain-setting across mid-range values, and voltage division at higher values — all within a single series and package. Three TCR grades are available at 5, 10, and 25 ppm/°C, allowing the designer to select the stability level appropriate to the thermal environment of the application without over-specifying. In free air without a heatsink the TNP10P/20P is rated to 1W continuous, enabling use in designs where space constraints prevent heatsink attachment but moderate power dissipation is still required.
The TNP10P and TNP20P are classified within RARA Electronics’ high-power precision category alongside the RMF four-terminal resistor and the RH/RHF high-power wire wound series. Together these types form the precision-at-power tier of RARA’s resistor portfolio, serving applications where the accuracy requirements of a precision resistor and the dissipation requirements of a power resistor must be met simultaneously. RARA Electronics holds ISO 9001 and IATF 16949 certifications, and the TNP10P/20P is manufactured to the same quality standards relied upon by major industrial and automotive customers globally, including Toshiba, Siemens, Rockwell, LG, and Schneider Electric.
TNP10P, TNP20P Series Heatsinkable Precision Power Film Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: TNP10P, TNP20P
Resistor type: Precision
Description: Power film
Power Rating: 10W
Resistance (Ω): 0.1~51k
Tolerance (%): ±0.05, ±1
TCR (ppm/C): 5, 10, 25
Applications of the TNP10P, TNP20P Series Heatsinkable Precision Power Film Resistors
Where RARA precision resistors are deployed in the field.
Power supply output voltage setting and regulation feedback — precision resistor dividers in linear and switching power supply feedback loops where the output voltage is determined by the ratio of two resistors, and where thermal drift in either resistor produces a proportional output voltage error across the operating temperature range
Current sensing and measurement in power circuits — series sense resistors in motor drive phase legs, DC-DC converter input and output stages, and battery management systems where the low resistance values available in the TNP10P/20P range allow useful current measurement with acceptable power loss, and where non-inductive construction ensures the sense signal is not distorted by reactive impedance during current transients
Motor drive and variable-speed drive precision circuits — gain-setting and feedback resistors in the analogue control loops of inverter drives, servo amplifiers, and stepper motor controllers where the resistor must dissipate several watts under continuous load while maintaining its resistance value within tolerance across the temperature rise associated with that dissipation
Constant-current source and electronic load circuits — precision sense and feedback resistors in programmable constant-current sources, electronic loads, and battery test equipment where accurate knowledge of the sense resistance is essential to the accuracy of the controlled or measured current, and where the heatsinkable package manages the continuous thermal load at full operating current
Switching power supply snubber and damping networks — non-inductive film resistors in RC snubber circuits across power semiconductor switches, transformer leakage inductance clamps, and gate drive damping networks where wire wound resistors would be unsuitable due to their self-inductance, and where transient energy dissipation demands a power-rated component
High-frequency measurement and test circuits — precision termination resistors, attenuator pads, and load resistors in signal generator outputs, network analyser calibration standards, and high-frequency test fixtures where non-inductive construction maintains resistive impedance at the frequencies under test and where power dissipation from high signal levels requires a heatsinkable component
Audio power amplifier and professional audio equipment — bias setting, emitter degeneration, and feedback resistors in class AB and class A output stages where continuous quiescent dissipation requires a power-rated component and where the low noise and non-inductive characteristics of the film construction are prerequisites for audio-quality performance
Industrial automation and process control signal conditioning — precision gain-setting and input attenuator resistors in analogue input modules, transmitter circuits, and process controllers mounted in enclosures where ambient temperature rise demands a heatsinkable component rather than a standard signal-level resistor
Medical instrumentation power circuits — precision current sense and feedback resistors in infusion pump motor drives, imaging system power supplies, and diagnostic equipment power stages where both the accuracy requirements of a medical-grade component and the dissipation requirements of the circuit must be satisfied within the compact envelope of the TO-126 package
Automotive and electric vehicle power electronics — precision sense and feedback resistors in on-board charger circuits, DC-DC converters, and battery management systems qualified to IATF 16949 standards, where the combination of tight tolerance, low TCR, non-inductive construction, and 10W heatsinkable power rating meets the simultaneous accuracy and dissipation demands of automotive power conversion circuits
Related Products of the TNP10P, TNP20P Series Heatsinkable Precision Power Film 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: 8G16, 8G24
Resistor type: Precision
Description: Wire wound
Power Rating: 0.33W
Resistance (Ω): 1~1M
Tolerance (%): ±0.005, ±0.01, ±0.1
TCR (ppm/C): 3
Model: GG102
Resistor type: Precision
Description: Wire wound
Power Rating: 0.3W
Resistance (Ω): 10~250k
Tolerance (%): ±0.01, ±0.1
TCR (ppm/C): 3
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.
