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Milliohm HOLRT1206-1W-150MR-1% HOLRT1206
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Milliohm HOLRT1206-1W-150MR-1%
- Type
- MILLIOHM
- Minimum package
- 5000 圆盘
Technical parameters
- Power
- 1W
- Electronic Component
- Electronic Component
- Electronic Component
- MILLIOHM
- Electronic Component
- HOLRT1206-1W-150MR-1%
- Electronic Component
- 1
- Package
- 1206
- Electronic Component
- Current Sense Resistor / Shunt
- Electronic Component
- ±1%
- Electronic Component
- 0.032g
- Electronic Component
- 150mΩ
- Electronic Component
- 1
- Electronic Component
- BM0264487177
- Electronic Component
- SMD
- Electronic Component
- ±100ppm/℃
- 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.
HOLRT1206-1W-150MR-1% 产品概述
一、产品简介
HOLRT1206-1W-150MR-1% 是一款面向电流采样的贴片型低阻值电阻（采样电阻/毫欧级分流器），封装为标准 1206 尺寸。额定阻值为 150 mΩ，精度 ±1%，额定功率 1 W，温度系数（TCR）±100 ppm/℃。本器件适用于对中低电流进行精确测量和电流保护场景，兼顾精度与PCB安装的可实现性。
二、关键电气参数与典型计算
- 阻值：0.150 Ω（150 mΩ）
- 精度：±1%
- 额定功率：1 W（基于推荐PCB散热条件）
- TCR：±100 ppm/℃（±0.01%/℃）
- 封装：1206（贴片）
典型使用计算：
- 允许连续电流 I = sqrt(P/R) = sqrt(1 / 0.15) ≈ 2.58 A（在额定功率且散热良好时）
- 在该电流下的压降 V = I·R ≈ 0.387 V
- 例如 1 A 时压降 = 0.15 V，耗散功率 = 0.15 W
注意：实际可通过PCB铜面积、焊盘设计和环境温度影响器件的允许功率，需结合热设计进行评估。
三、精度与温度漂移影响
±1% 的初始精度保证了在低阻值测量场景下的基础测量可靠性；TCR ±100 ppm/℃ 表示每升高 1℃ 电阻值变化约 0.01%，在较宽温度范围下仍能维持较小的漂移。组合影响需考虑：
- 初始误差 ±1%
- 温差造成的额外误差：例如环境与基准温度差 50℃ 时，TCR 引起的变化约 0.5%（50 × 0.01%） 测量系统设计通常采用差分放大、校准或温度补偿以降低温漂对测量精度的影响。
四、封装与安装建议
- 1206 贴片封装，便于表面贴装(SMT)生产线加工。
- 为了获得标称功率能力和稳定的温升控制，建议：
- 增大焊盘铜面积，尤其是两端电流端采用较大铜箔；
- 如空间允许，在焊盘下方布置热孔并接地铜层以辅助散热；
- 避免器件靠近高温元件或风道死角；
- 焊接工艺要控制回流曲线，避免过度加热引起阻值漂移或可靠性问题。
五、典型应用场景
- 电流采样与电量计算（电池管理系统 BMS、便携电源）
- 过流检测与限流保护（DC-DC 转换、电机驱动）
- 功率测量与能耗计量的低压侧分流
- 各类需要小压降、高精度电流检测的消费电子与工业设备
六、可靠性与选型注意
- 尽管器件为毫欧级低阻，测量端子及焊点电阻对最终测量影响显著，建议在测量电路中采用合适的差分放大器和接线方式。
- 对于需要更高精度或更小温漂的场合，可考虑四端（Kelvin）分流器或更低 TCR 的专业电阻型号。
- 订购时请以厂商提供的完整数据表为准，关注功率-温度降额曲线、焊接规范与环境可靠性测试结果（如温度循环、热冲击等）。
如需进一步的热仿真、PCB 布局示意或与特定测量放大器的匹配建议，可提供应用场景与PCB信息以便给出更具体的实施方案。
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