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ERJ8CWFR025V
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- PANASONIC ERJ8CWFR025V
- Type
- PANASONIC
- Minimum package
- 5000 圆盘
Technical parameters
- Power
- 1W
- Electronic Component
- Electronic Component
- Electronic Component
- PANASONIC
- Electronic Component
- ERJ8CWFR025V
- Electronic Component
- 1
- Package
- 1206
- Electronic Component
- Current Sense Resistor / Shunt
- Electronic Component
- ±1%
- Electronic Component
- 0.037g
- Electronic Component
- 25mΩ
- Electronic Component
- 1
- Electronic Component
- BM0257240716
- Electronic Component
- SMD
- Electronic Component
- ±75ppm/℃
- 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.
ERJ8CWFR025V 产品概述
一、产品简介
ERJ8CWFR025V 为 PANASONIC（松下）系列 1206 封装贴片电阻，定位为电流采样电阻（分流器）。阻值 25mΩ，精度 ±1%，额定功率 1W，温度系数（TCR）±75ppm/℃。适用于需要低阻值、小电压降与中等功率耗散的电流检测与闭环控制场合。
二、主要技术参数
- 阻值：25 mΩ（0.025 Ω）
- 精度：±1%
- 额定功率：1 W（在规定散热条件下）
- 温度系数：±75 ppm/℃
- 封装：1206（SMD）
- 安装方式：贴片（表面贴装）
三、电气性能与计算示例
- 电压降：V = I × R。
- 1 A 时 V = 25 mV；耗散功率 P = I^2R = 0.025 W。
- 3 A 时 V = 75 mV；P = 0.225 W。
- 最大连续电流（理论值）：Imax = sqrt(P额定 / R) ≈ sqrt(1 / 0.025) ≈ 6.32 A（实际应考虑环境温度与散热条件，建议留裕量）。
- 温漂影响：TCR ±75 ppm/℃，例如环境温度上升 50℃ 时阻值变化约 0.375%（75e-6 × 50），需与初始公差叠加评估系统精度。
四、封装与安装建议
- 1206 尺寸（约 3.2 × 1.6 mm）对热量散发有限，建议在 PCB 中使用较大铜箔面积或加粗过孔，以改善散热。
- 布局上，应将分流电阻置于主电流回路中，尽量靠近电源或负载连接点，缩短高电流走线以减少额外压降。
- 为提高测量精度，差动放大器或专用电流检测放大器应靠近分流电阻布置，采用短且对称的感测走线；若需更高精度，考虑四端取样或专用四端分流器方案。
五、典型应用
- DC-DC 转换器电流检测、负载电流监控
- 电池管理系统（BMS）电流测量与充放电检测
- 过流保护、功率管理与电机驱动电流采样
- 便携设备与消费电子电源监控
六、选型与设计注意事项
- 若应用中持续电流接近计算的理论 Imax，应考虑热降额并增大安全裕度或选用更大功率/更低 TCR 的分流电阻件。
- 系统测量精度受电阻初始公差、温漂、焊接应力及 PCB 走线影响，关键测量场合建议在系统级做校准。
- 注意共模电压范围与放大器输入限制，选择与分流位置匹配的测量放大器。
七、可靠性与焊接
- 遵循制造商推荐的回流焊温度曲线与工艺参数，避免超温和长时间加热导致电阻漂移。
- 存储与搬运中避免机械冲击和过度弯曲 PCB，焊接后可做长期漂移测试以确认稳定性。
八、总结
ERJ8CWFR025V 提供低阻值、较高精度与中等功率能力的贴片式电流采样解决方案，适合对压降敏感且需在有限空间内实现电流检测的产品。在实际应用中应重视热管理与测量链路布局，以确保长期精度与可靠性。针对高精度或高功率场合，可在设计初期评估更低 TCR、更大功率或四端分流器的替代方案。
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