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cjiang FNR4018S220MT
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- cjiang FNR4018S220MT
- Type
- CJIANG
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJIANG
- Electronic Component
- FNR4018S220MT
- Electronic Component
- 1
- Package
- SMD
- Type
- Magnetic Display Inductor
- Electronic Component
- Power Inductor
- Electronic Component
- ±20%
- Electronic Component
- 0.216g
- Inductor
- 22uH
- Electronic Component
- 1
- Electronic Component
- BM0258614557
- Current
- 850mA
- Resistor(DCR)
- 468mΩ
- 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.
FNR4018S220MT 产品概述
一、产品简介
FNR4018S220MT 是长江微电（cjiang）推出的一款表面贴装磁胶屏蔽功率电感，标称电感量为 22 μH，公差 ±20%，封装小巧，典型外形为 4×4 mm SMD，适用于板级电源滤波与中低频开关电源回路。器件以磁胶工艺实现屏蔽特性，便于在受限空间内降低电磁干扰同时保持较高的电流承载能力。
二、主要参数
- 电感值：22 μH（±20%）
- 额定电流（Irated）：850 mA
- 饱和电流（Isat）：880 mA（定义通常为在该电流下电感下降到某一百分比）
- 直流电阻（DCR）：468 mΩ
- 封装形式：SMD，尺寸约 4×4 mm
- 类型：磁胶屏蔽功率电感
三、性能特点
- 宽电感公差（±20%）适合容差要求不严格的电源与滤波应用；
- 直流电阻较高，导通损耗不可忽视，在高电流应用下会产生明显功耗与发热；
- 饱和电流接近额定电流，设计时需留有余量以避免在峰值电流时发生明显电感下降；
- 屏蔽磁结构有利于减小对周围元件的磁耦合影响，便于密集布板布局。
四、典型应用
- 降压（Buck）/ 升压（Boost）类 DC-DC 开关电源的输出滤波；
- 板级电源回路与电流隔离滤波；
- LED 驱动与便携式设备的电源管理；
- EMI 抑制及噪声滤波场合。
五、选型与使用建议
- 根据峰值电流与纹波电流评估是否超出饱和电流（Isat）门限。由于 Isat 与 Irated 相近，建议在持续工作电流取 Isat 的 60%–80% 作为安全工作范围，具体取值应结合纹波与工作温度确定；
- 考虑功率损耗：在额定电流 0.85 A 下近似损耗 P = I^2·DCR ≈ 0.338 W，需评估元件温升与散热条件；
- 电感的实际值会随直流偏置（DC bias）下降，设计时应考虑偏置引起的电感衰减；
- 对于效率敏感的设计，可优先评估 DCR 更低或饱和裕量更大的型号。
六、封装与焊接注意事项
- 采用 SMD 封装，建议按厂家推荐的焊盘尺寸和焊接工艺进行回流焊，避免过量热循环导致材料性能变化；
- 贴装位置应尽量缩短功率回路的环路面积，静置焊盘周围尽量少放过多高热元件以利散热；
- 在波峰/回流焊后建议进行外观与电气测试确认无焊接缺陷。
七、测试与可靠性建议
- 量产前进行温升测试、纹波承载能力测试以及电感随直流偏置的特性曲线测量；
- 对于关键应用，建议做寿命和热循环试验以验证长期可靠性。
总结：FNR4018S220MT 以小尺寸、屏蔽结构和中等电流能力适用于多种板级电源与滤波场景，但需注意其较高 DCR 与饱和裕度有限的特性，在高效率或大电流设计中应慎重评估并做好降额与散热设计。
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