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TA-I Technology RLM20FECR020
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- RLM20FECR020
- Type
- TA-I Technology
- Minimum package
- 4000 圆盘
Technical parameters
- Power
- 1W
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- RLM20FECR020
- Electronic Component
- 1
- Package
- 2010
- Electronic Component
- Current Sense Resistor / Shunt
- Electronic Component
- ±1%
- Electronic Component
- 0.059g
- Electronic Component
- 20mΩ
- Electronic Component
- 1
- Electronic Component
- BM0264549182
- Electronic Component
- SMD
- Electronic Component
- ±50ppm/℃
- Resistor Type
- Current Sense Resistor
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
RLM20FECR020 产品概述
一、产品简介
RLM20FECR020 为大毅科技推出的一款贴片型电流采样电阻（分流器），标称阻值 20 mΩ，阻值精度 ±1%，额定功率 1 W，温度系数（TCR）±50 ppm/℃，封装尺寸 2010（约 2.0 mm × 1.0 mm）。该器件适用于中小电流测量场合，提供低压降、稳健的温漂性能，便于表面贴装工艺集成。
二、主要参数
- 阻值：20 mΩ（0.02 Ω）
- 精度：±1%
- 额定功率：1 W（参考 PCB 散热条件）
- 温度系数：±50 ppm/℃（典型）
- 封装：2010 贴片
- 安装方式：SMD（贴片安装）
- 品牌：大毅科技
三、典型性能与计算示例
- 电压降：U = I × R。举例：在 5 A 时 U = 5 A × 0.02 Ω = 0.10 V。
- 功率损耗：P = I^2 × R。若连续功率限制为 1 W，则最大连续电流 Imax ≈ sqrt(1 W / 0.02 Ω) ≈ 7.07 A；超过此值需考虑热量管理或脉冲工作。
- 温漂影响：TCR 为 ±50 ppm/℃，即每升高 1℃ 阻值变化约 0.005%；温度变化 40℃ 时阻值变化约 0.2%，对应测量误差需与初始 ±1% 精度叠加评估。
四、应用场景
- 电源管理与电流检测（DC-DC、LDO）；
- 电池管理系统（BMS）与充放电检测；
- 电机驱动与驱动板电流监控；
- 服务器与通信设备的电流采样与保护电路。
五、PCB 布局与散热建议
- 尽量将采样电阻置于电流路径短且粗的走线中，靠近电源输入或负载端放置；
- 使用宽大的铜箔或散热岛连接大端，以提升热散能力；
- 若要求高精度，考虑四端测量或采用差分放大器减小引线和焊点电阻影响；
- 对于高电流或连续工作场合，评估并适当降低工作电流或采用并联/更大功率型号以保证可靠性。
六、焊接与可靠性注意事项
- 推荐按器件制造商或 J-STD-020 的回流焊工艺规范进行焊接；避免超过推荐的峰值温度和超时暴露；
- 贴片器件应采取防潮措施与静电防护；长期储存建议遵循干燥包装与环境控制；
- 使用前参阅大毅科技的详细数据手册，以获取热阻、导热路径及可靠性试验数据。
七、选型与误差评估
- 若系统对压降极其敏感或存在大于 7 A 的长期电流，应选择更低阻值或更高功率等级的分流器；
- 总测量误差由电阻公差、TCR、放大器偏置与共模误差、引线/焊点电阻等共同决定。典型设计中，采用 ±1% 分流器并配合低偏移放大器，可实现接近 1–2% 的系统电流测量精度（不含校准）。
RLM20FECR020 以其紧凑封装、较低阻值和稳定的温漂特性，适合需要占板面积小且测量精度较高的电流采样设计。欲获更详细的电气、热学和封装尺寸信息，请参阅大毅科技提供的产品数据手册。
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