Six-terminal alloy resistor, high precision and high power dual-track approach

author: Milliohm Electronic

2025-07-15

I.Structural design and principle

The milliohm electronic six-terminal package alloy resistor adopts a unique design, including two pairs of current pins and a pair of voltage detection pins. The current pin is responsible for carrying large currents to ensure the stable transmission of current in the circuit; the voltage detection pin uses the Kelvin detection principle to independently measure the voltage across the resistor, effectively avoiding the interference of lead resistance and contact resistance, and providing guarantee for accurate measurement. This design greatly improves the measurement accuracy and stability of resistors in complex circuit environments.

II. Performance advantages

Ultra-high precision: The resistance accuracy can reach ±0.1% or even higher. In circuits with extremely high precision requirements, such as precision measuring instruments, high-end medical equipment, and battery management systems (BMS) for automotive electronics, it can accurately detect current and voltage changes to ensure stable operation of the system.

Low temperature coefficient (TCR): The typical temperature coefficient is as low as 10ppm/℃, and some high-quality products are as low as ±5ppm/℃. In an environment with large temperature fluctuations, the resistance value changes very little, providing stable performance support for equipment working in a wide temperature range, such as industrial automation equipment, aerospace electronic equipment, etc.

High power carrying capacity: The overcurrent capacity is 5~300A, which can withstand a few watts to tens of watts of power. Different packages and sizes correspond to different power levels. It is suitable for high-power circuits, such as high-power power modules, motor drive circuits, etc., to effectively avoid resistor damage and performance degradation caused by power overload.

Strong current impact resistance: The special alloy material gives it excellent current impact resistance, and it can withstand impacts several times the rated current without damage in an instant. In scenarios where large current impacts may occur, such as circuit startup and short-circuit protection, it can ensure the safe and reliable operation of the circuit.

Good heat dissipation performance: In addition to being used alone, the six-terminal alloy resistor launched by Millioh Electronics can also be equipped with a heat sink according to engineering needs as shown in the figure below, which can quickly dissipate the heat generated by the resistor when it is working, reduce its own temperature, and improve stability and reliability under high power and long-term working conditions.

III. Material selection

Resistor body material: Select high-stability and high-resistivity Kama alloy material. Kama alloy has the characteristics of high precision, low temperature drift, extremely low thermoelectric potential, and strong oxidation resistance.

Pin material: Pins are generally made of highly conductive copper, with relatively low contact resistance and less impact on accuracy.

IV. Application fields

Automotive electronics: In the battery management system of the car, accurately monitor the battery charging and discharging current to ensure battery safety and life; used for current detection and control of key systems such as the engine control unit (ECU) and anti-lock braking system (ABS) to ensure the safety of the car and stable performance.

Industrial automation: In industrial equipment such as motor drives, inverters, and programmable logic controllers (PLCs), high-precision current detection and control are achieved to improve the automation level of industrial production and the reliability of equipment operation.

Medical equipment: Used in medical monitoring equipment such as blood glucose meters, electrocardiographs, and monitors to ensure the accuracy of measurement data; in the power management circuit of medical equipment, ensure stable power output to provide guarantee for the normal operation of the equipment.

Communication equipment: In the power management and signal processing circuits of communication equipment such as 5G base stations and server power supplies, six-terminal alloy resistors rely on their high precision and high stability to ensure the accuracy of signal transmission and the efficient operation of the power system.

V. Conclusion

The six-terminal alloy resistor HoLRS 7998 developed by Milliohm Resistors plays a key role in many fields with its excellent performance. In circuit design and equipment manufacturing, the reasonable selection and application of six-terminal alloy resistors can significantly improve the accuracy, stability and reliability of the circuit, laying a solid foundation for the high-performance operation of various electronic devices.

If you are designing electronic circuits, you may consider using Milliohm Electronics' six-terminal alloy resistors, which will bring higher accuracy and more stable performance to your circuits, helping more reliable and high-end products stand out in the market.