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RL12FTNR390是大毅科技推出的一款贴片式电流采样电阻(分流器),专为电子电路中的电流检测、过流保护及功率监控设计,凭借高精度、小体积、稳定的温度特性,适配多种中低功率电子设备的高密度布局需求。
作为电流采样领域的实用型元件,RL12FTNR390的核心定位是中低功率电路的高精度电流检测,解决传统采样元件精度不足、体积过大或功率不匹配的问题。其核心属性可概括为:
RL12FTNR390的标称阻值为390mΩ(即0.39Ω),精度等级为**±1%**。在常温(25℃)下,实际阻值偏差不超过±3.9mΩ,可有效降低电流计算误差(电流I=V/R,阻值偏差直接影响电流检测精度)。该精度水平适用于对采样准确性要求较高的电源管理、电机控制等场景。
额定功率为500mW,根据功率公式P=I²R,可计算其最大允许电流约为1.13A(I=√(P/R)=√(0.5W/0.39Ω)≈1.13A)。这一功率范围覆盖了大部分中低功率电路的电流检测需求,避免因功率过载导致电阻烧毁。
温度系数为**±200ppm/℃**,表示温度每变化1℃,阻值变化±200×10⁻⁶。以环境温度从25℃升至100℃(变化75℃)为例,阻值变化约为±0.00585Ω(±1.5%),可满足工业环境(-40℃85℃)或消费电子(0℃50℃)的温度波动需求,保证不同温度下采样精度的一致性。
采用1206贴片封装(英制尺寸:长3.2mm×宽1.6mm),符合国际电子封装标准,适配回流焊、波峰焊等自动化贴装工艺,焊接可靠性高;小体积设计可有效节省PCB空间,支持高密度电路板布局,尤其适合便携设备、小型模块的设计需求。
RL12FTNR390的参数特性使其适配以下典型场景:
大毅科技作为专业被动元件制造商,拥有多年电阻研发与生产经验,RL12FTNR390符合RoHS、REACH等环保标准,电极采用抗氧化材料,耐焊接热性能优异(可承受260℃回流焊温度),长期使用可靠性高;批量产品一致性好,可降低客户生产良率风险,是中低功率电流采样场景的可靠选择。
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