WMSIC Electronic Components

Milliohm HOLRS3921-5W-5MR-1% HOLRS3921

ModelHOLRS3921-5W-5MR-1%
Package3921
BrandMilliohm
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 26+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
Milliohm HOLRS3921-5W-5MR-1%
Type
MILLIOHM
Minimum package
2500 圆盘

Technical parameters

Power
5W
Electronic Component
Electronic Component
Electronic Component
MILLIOHM
Electronic Component
HOLRS3921-5W-5MR-1%
Electronic Component
1
Package
3921
Electronic Component
Current Sense Resistor / Shunt
Electronic Component
±1%
Electronic Component
0.295g
Electronic Component
5mΩ
Electronic Component
1
Electronic Component
BM0264769478
Electronic Component
25ppm/℃~50ppm/℃
Resistor Type
Resistor
Electronic Component
Electronic Component
Electronic Component
2500

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

HOLRS3921-5W-5MR-1% 产品概述

一、产品简介

HOLRS3921-5W-5MR-1% 是 Milliohm(毫欧)品牌的一款合金电流采样电阻(分流器),采用3921封装,额定功率5W,阻值5mΩ,精度±1%,温度系数(TCR)25ppm/℃~50ppm/℃。该器件专为精确电流测量与功率监控设计,兼具低阻值、低温漂和高功耗能力,适用于要求高精度的电源与电池管理系统。

二、主要技术参数

  • 电阻类型:合金电阻(低温漂、抗热稳定性好)
  • 阻值:5 mΩ(0.005 Ω)
  • 精度:±1%
  • 额定功率:5 W(封装及散热条件下)
  • 温度系数:25 ppm/℃ ~ 50 ppm/℃
  • 封装:3921(SMD型,便于自动化贴装与批量生产)
    这些参数确保在不同工况下保持良好的一致性与可重复性。

三、性能与特点

  • 极低压降:5mΩ 在大电流测量时压降小,减少功耗与系统发热。
  • 稳定性高:合金材质与低TCR保证随温度变化的电阻漂移小,利于长期精确测量与校准。
  • 高功率承载:5W 额定功率适合中大电流采样。典型计算:I_max = sqrt(P/R) = sqrt(5/0.005) ≈ 31.6A(持续功率条件下),使用时应考虑散热和热阻。
  • 低寄生电感与低噪声:适用于快速动态电流检测与瞬态响应要求较高的场合。

四、典型应用

  • 电池管理系统(BMS)与充放电管理
  • 开关电源与DC-DC转换器电流检测
  • 伺服与电机驱动电流监测
  • 服务器与通信设备的电流保护与计量
  • 电子负载与电源测试仪器

五、安装与使用建议

  • 建议采用四端(Kelvin)连接方式以消除接触电阻误差,提升测量精度。
  • 布局上应保证分流器与测量放大器之间的差分路径对称且短,避免共模噪声。
  • 热管理:为保证5W 额定功率输出,应配置足够铜箔面积与散热通孔(vias),并参考实际PCB环境进行功率/温升评估与降额设计。
  • 焊接工艺:遵循制造商推荐的回流焊工艺与温度曲线,避免过热和机械应力导致电阻变化。
  • 校准:在系统级建议进行一次出厂或装机校准,以补偿微小阻值及温漂带来的测量误差。

六、选型注意事项

  • 若系统允许更大压降以降低热量,可考虑更高阻值型号;若要求更小的压降或更高持续电流,需选用更低阻值或更大功率的型号。
  • 注意工作环境温度与散热条件,超过封装散热能力时应对额定功率进行相应降额。
  • 对于高精度测量场景,关注TCR 下限,25 ppm/℃ 能提供更好的温度稳定性。

HOLRS3921-5W-5MR-1% 以其良好的温漂性能、紧凑封装及稳定的功率能力,适合在对精确电流采样有较高要求的工业与消费电子系统中广泛应用。若需更详细的电气特性曲线、封装尺寸或应用电路示意,请参考产品数据手册或联系供应商技术支持。

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