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cjiang FNR4018S4R7MT
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- cjiang FNR4018S4R7MT
- Type
- CJIANG
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJIANG
- Electronic Component
- FNR4018S4R7MT
- Electronic Component
- 1
- Package
- SMD,4x4mm
- Type
- Magnetic Display Inductor
- Electronic Component
- Power Inductor
- Electronic Component
- ±20%
- Electronic Component
- 0.216g
- Inductor
- 4.7uH
- Electronic Component
- 1
- Electronic Component
- BM0233341753
- Current
- 1.8A
- Resistor(DCR)
- 117mΩ
- 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.
FNR4018S4R7MT 产品概述
一、产品简介
FNR4018S4R7MT是长江微电（cjiang）推出的一款磁胶屏蔽功率贴片电感，封装为SMD 4×4mm，电感值为4.7μH，公差±20%。该器件专为开关电源与电流滤波场合设计，兼顾体积、饱和特性和散热性能，适合于点负载电源、降压（Buck）转换器、LED驱动和功率滤波电路等应用。
二、主要参数
- 电感值：4.7 μH ±20%
- 额定电流（Irms）：1.8 A
- 饱和电流（Isat）：2.2 A
- 直流电阻（DCR）：约117 mΩ
- 类型：磁胶屏蔽电感（屏蔽结构，漏磁小）
- 封装：SMD，尺寸 4 × 4 mm
- 品牌：cjiang（长江微电）
这些参数决定了器件在实际电源设计中的电压纹波抑制能力、功率损耗和抗饱和能力。
三、性能与注意事项
- 电流损耗：在直流电阻约117 mΩ下，按P=I^2·R计算，工作在额定电流1.8 A时的铜损约为0.38 W，设计时应考虑器件的自热和周围散热环境。
- 饱和特性：Isat=2.2 A，超过此电流时电感量会显著下降，可能导致滤波失效或电流失控。建议连续工作电流留有裕量（典型留余20%~30%），避免长期在接近Isat的条件下使用。
- 屏蔽结构：磁胶屏蔽有助于减小磁通外泄，适合密集布板与敏感信号邻近布局。
四、应用建议与PCB布板要点
- 放置位置：电感应尽量靠近开关器件或负载侧开关节点，缩短信号回路，减小寄生电感与辐射。
- 铜箔与散热：为降低结温，建议在器件热区使用较大铜面，并配合过孔或散热过孔（VIA）形成热通道；在多层板上使用电源平面可进一步散热。
- 焊接工艺：遵循常规无铅回流温度曲线，避免过长高温工艺导致漆包线或磁性材料性能劣化。
- 滤波配置：与输入/输出电容配合，选择合适的截止频率与纹波电流能力，以达到稳定的纹波抑制和转换效率。
五、选型与可靠性提示
- 若设计中出现短时峰值电流接近或超过Isat，需考虑采用更高Isat或更大电感值的器件以保证系统稳定。
- 对于要求更低DCR或更高饱和电流的场合，可参考同系列更大尺寸或不同磁芯材料的型号。
- 在严苛环境（高温、高湿、振动）下，建议与供应商确认可靠性测试（如高温老化、湿热、机械冲击）记录与适配方案。
总体而言，FNR4018S4R7MT以其4×4mm小封装、4.7μH 电感与约2.2A的抗饱和能力，在小型化开关电源和点负载应用中提供了良好的性能与成本平衡。设计时注意电流裕量与散热布局，可发挥器件的最佳可靠性与效率。
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