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cjiang FNR4018SR47NT
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- cjiang FNR4018SR47NT
- Type
- CJIANG
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJIANG
- Electronic Component
- FNR4018SR47NT
- Electronic Component
- 1
- Package
- SMD
- Type
- Magnetic Display Inductor
- Electronic Component
- Power Inductor
- Electronic Component
- ±30%
- Electronic Component
- 0.216g
- Inductor
- 470nH
- Electronic Component
- 1
- Electronic Component
- BM0265018972
- Current
- 4.5A
- Resistor(DCR)
- 18mΩ
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
FNR4018SR47NT产品概述
FNR4018SR47NT 是长江微电（cjiang）推出的一款表面贴装功率电感，封装尺寸约为4×4 mm，属磁胶屏蔽结构，标称电感值470 nH，公差±30%，额定电流4.5 A，饱和电流（Isat）5.2 A，直流电阻（DCR）约18 mΩ。该器件设计用于要求高电流、低损耗和良好电磁兼容性的开关电源与点负载供电场合。
一、主要特性
- 电感值：470 nH，公差 ±30%
- 额定电流：4.5 A（连续工作参考值）
- 饱和电流：5.2 A（磁芯进入饱和时的参考上限，具体定义以数据手册为准）
- 直流电阻：≈18 mΩ，低DCR有利于降低I^2R损耗
- 结构类型：磁胶屏蔽电感（SMD），有利于减小磁通外泄与EMI耦合
- 封装尺寸：4×4 mm 级别，适合高密度PCB布局
二、性能说明与计算参考
- 功率损耗估算：在额定电流4.5 A下，近似铜损 P ≈ I^2·DCR = 4.5^2 × 0.018 ≈ 0.36 W。实际温升受PCB铜箔面积、散热条件与环境温度影响。
- 饱和与直流偏置：随着直流偏置电流增加，电感值会下降。Isat（5.2 A）通常表示电感下降到某一百分比（例如30%）时的电流阈值，设计时应预留裕量以避免磁芯饱和。
- 高频特性：磁胶屏蔽结构在开关频率范围内表现出较好的损耗控制与屏蔽效果，但交流损耗与频率、纹波电流有关，需参考具体测试曲线。
三、典型应用场景
- 同步整流降压（Buck）转换器的电感元件
- 点负载（Point-of-Load）稳压电源
- LED驱动、电源管理模块
- 工业与通信设备的开关滤波场合（在满足环境/认证条件下使用）
四、设计与使用建议
- 布局：电感与开关管、二极管或电感环路应尽量靠近，减小回流路径面积以降低EMI。输入输出侧配合合适的去耦电容以控制纹波。
- 温升与散热：若长期接近额定电流工作，建议增加铜箔散热或改善通风，查看器件温升测试数据以确认长期可靠性。
- 余量设计：建议在系统设计中采用额定电流的70%~80%作为持续工作电流参考，以防止长期偏置导致性能退化。
- 焊接与工艺：遵循无铅回流温度曲线规范进行焊接，避免过热损伤磁胶材料。建议参考厂方推荐的回流曲线与焊盘尺寸。
五、可靠性与选型注意
- 典型可靠性试验包括高低温循环、湿热、振动与焊接热稳性测试，选型时应确认数据手册中相应条目或向厂商索取测试报告。
- 若应用涉及更严格的工作环境（例如汽车或航空级），请核实器件是否通过对应的认证或选用专用等级产品。
总体来说，FNR4018SR47NT 以其4×4 mm小型化封装、470 nH的中小量级感值、较低DCR和较高的额定电流，适合用于对体积、功率损耗与EMI有综合要求的开关电源场合。实际设计中建议结合完整数据手册的频率响应、温升曲线与寿命测试数据进行最终确认。若需更详细的参数曲线或样品测试支持，可联系长江微电获取完整资料。
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