What are the series of RALEC alloy resistors?

As a well-known electronic component manufacturer, RALEC's alloy resistors are widely recognized for their high reliability, high precision, and excellent current detection capabilities. To meet the needs of different scenarios, Wangquan RALEC provides multiple distinctive alloy resistor series. Understanding the characteristics of these series can help you make more accurate selections.
The following table summarizes several main alloy resistor series and their core characteristics of Wangquan RALEC:
|Series model prefix | Series name/main features | Typical application scenarios | Overview of key parameters|
|LR | Universal Metal Alloy Resistors | Power Management, Industrial Equipment Current Sampling | Resistance as Low as 0.3m Ω, Power 0.5W5W, Accuracy ± 1%|
|LRAs | Vehicle grade alloy resistors | Automotive electronic control systems (such as ECU, BMS) | Compliant with vehicle specifications and suitable for high reliability environments|
|LRS | High precision current sensing resistor for vehicles (four terminals) | Precise detection for automotive ECU, battery management system (BMS), etc. | Four terminal Kelvin connection, low sensitivity design, reducing measurement errors|
|LR4 | Four terminal alloy resistor | High precision measurement circuit for precision instruments, sensors, etc. | Kelvin connection, resistance range 0.3m Ω 75m Ω|
|LRH | Low inductance alloy resistor | High frequency switching power supply, inverter, etc. | Optimized design to reduce parasitic inductance|
|LRE | Small volume alloy resistors | Space limited products such as portable consumer electronics and wearable devices | Compact packaging suitable for high-density PCB design|
Detailed interpretation and selection points of each series
1. LR series: Universal main force
The LR series is the most fundamental and widely used series of Wangquan RALEC alloy resistors. It covers a variety of package sizes from 1206 to 4527, with a wide power range that can meet the current sampling and power control needs of most industrial and consumer electronics products. If you need a universal and reliable Wangquan RALEC alloy resistor, the LR series is usually the first choice.
2. LRA and LRS series: aimed at automotive electronics
With the increasing level of automotive electronics, the reliability requirements for components are extremely strict.
The LRA series is a Wangquan RALEC alloy resistor designed specifically for automotive applications, which complies with relevant automotive industry standards.
The LRS series goes further by adopting a four terminal (Kelvin) connection method. This design can eliminate the influence of test lead resistance and achieve extremely high precision current measurement, especially suitable for key parts such as engine control units (ECU), on-board chargers (OBC), and battery management systems (BMS).
3. LR4 and LRH series: for special electrical needs
LR4 series: also a four terminal resistor, different from LRS that focuses on vehicle specifications, the LR4 series serves a wider range of fields that require precision measurement, such as laboratory equipment, high-end power supplies, and precision sensors.
LRH series: specifically optimized for high-frequency application scenarios. In high-frequency switching circuits, the parasitic inductance of the resistor itself can affect signal integrity. The LRH series alloy resistors from Wangquan RALEC have reduced parasitic inductance through structural optimization, making them suitable for applications such as communication power supplies and inverters.
4. LRE series: meets the trend of miniaturization
Electronic products are becoming increasingly compact, and the requirements for component volume are also increasing. The LRE series, as a small-sized Wangquan RALEC alloy resistor, can provide stable current detection function in limited space and is commonly used in compact devices such as fast charging chargers, mobile power banks, TWS earphones, etc.
How to choose the appropriate Wangquan RALEC alloy resistor?
When choosing, you can follow the following path to quickly locate:
1. Determine the application field: general industrial, automotive electronics, or high-frequency or precision measurement?
2. Focus on core parameters:
Resistance and accuracy: Calculate the required resistance based on the sampled voltage and current, and determine the acceptable error range (such as ± 1%).
Rated power: The power consumption (I ² R) of the resistor must be less than its rated power and leave sufficient margin.
Package size: Choose the appropriate size based on the spatial layout and heat dissipation conditions of the PCB board (such as 2010, 2512, etc.).
Special performance: Whether special features such as four terminals, low sensitivity, or vehicle certification are required.
In summary, Wangquan RALEC's alloy resistors cover a wide range of diverse needs from consumer electronics to the automotive industry through multiple segmented series. Correctly understanding the characteristics of these series is the key to fully utilizing the resistance performance of Wangquan RALEC alloy and achieving stable and reliable circuit design.