Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
cjiang FNR4018S221MT
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- cjiang FNR4018S221MT
- Type
- CJIANG
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJIANG
- Electronic Component
- FNR4018S221MT
- Electronic Component
- 1
- Package
- SMD
- Type
- Magnetic Display Inductor
- Electronic Component
- Power Inductor
- Electronic Component
- ±20%
- Electronic Component
- 0.216g
- Inductor
- 220uH
- Electronic Component
- 1
- Electronic Component
- BM0258614563
- Current
- 270mA
- Resistor(DCR)
- 5.2Ω
- 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.
FNR4018S221MT 产品概述
一、产品简介
FNR4018S221MT 是长江微电（cjiang）推出的一款表面贴装磁胶屏蔽功率电感，标称电感值 220 µH，公差 ±20%。封装为 SMD，外形尺寸约 4.0 × 4.0 mm（型号 4018），适用于对体积有严格要求的电源与滤波应用。该器件以结构紧凑、屏蔽良好为特点，便于在高密度 PCB 布局中实现磁耦合抑制与稳定滤波。
二、主要参数
- 电感值：220 µH ±20%
- 额定电流（Ir）：270 mA
- 饱和电流（Isat）：300 mA（定义为电感下降至初始值的某一比例时的直流偏置电流）
- 直流电阻（DCR）：5.2 Ω
- 类型：磁胶屏蔽电感（屏蔽结构，降低外泄磁场）
- 封装：SMD，尺寸约 4 × 4 mm（4018 系列）
需要注意的是，本型号 DCR 较大，在接近额定电流工作时会产生明显的功耗与发热，应在实际应用中综合考虑能量损耗与温升。
三、典型应用场景
- 低频电源滤波、输入/输出滤波器（如线性电源或低功率 DC–DC）
- EMI/噪声抑制滤波网络
- 小型便携设备的电源去耦与软启动电路
- 对体积敏感且电流不大的电源链路
由于 DCR 较高，该元件不适合用在追求高转换效率且输出电流较大的开关电源主电感上；更适合用于滤波或限流场合。
四、安装与使用注意事项
- 建议对电流进行降额使用，通常将电流限制在额定电流 60%～80% 以内以减少温升与防止接近饱和。
- 在 PCB 布局中保持电感附近有足够的散热通路，并避免高温元件紧邻，以降低温升影响。
- 采用符合标准的回流焊工艺，避免超出厂家规定的温度曲线以防封装或磁体性能劣化。
- 在电路设计时应结合实际工作频率测量直流偏置下的电感值（L vs Id 曲线），确认在工作电流下电感仍满足滤波要求。
五、选型与测试建议
- 若目标为低损耗开关电源主电感，应优先选择低 DCR、较高 Isat 的型号；FNR4018S221MT 更适用于滤波/限流用途。
- 上电前在样板上测量 DCR、空载电感及在典型直流偏置下的电感衰减，评估功耗（P = I^2·DCR）与温升。
- 评估磁饱和裕量：若工作脉冲或瞬态电流可能超过额定值，应选择 Isat 更高的器件或增加安全系数。
总结：FNR4018S221MT 针对体积受限且电流不大的电源滤波与 EMI 抑制场合，提供屏蔽性好、尺寸小巧的解决方案，但需注意其较高的 DCR 和接近额定电流时的功耗与饱和特性，设计时应合理降额与做好热管理。
Request for quote
Send RFQ
Use the form for single models, category sourcing, and multi-line BOM requirements.
Product sourcing intelligence
Model, package, availability, and BOM fit reviewed before quotation.
WMSIC turns product data, package visuals, BOM context, and sourcing signals into practical RFQ notes for buyers.
BOM matching & alternatives
BOM lines are compared by package, parameters, quantity, and workable alternatives for cleaner sourcing decisions.
Sourcing availability signal
Stock routes, quotation confidence, lead-time notes, and shipment feasibility are checked before sales follow-up.
Buyer sourcing scenarios
Examples of how common component sourcing requests are organized.
Typical RFQ scenarios based on the WMSIC form fields, catalog data, manual review steps, and shipment preparation workflow.
The buyer shares the full part number, package requirement, quantity, destination, and available product photos so the quotation can record the exact version under review.
A multi-line BOM is organized into direct sourcing lines, lines that need package clarification, and lines where alternative-part review is permitted.
The original manufacturer part number, datasheet revision, application, critical limits, and acceptable changes are collected before possible candidates are discussed.
Sample quantity, minimum packing, package format, target date, and courier destination are kept together in one RFQ conversation.
Package photos, model markings, board context, and the quantity needed for repair help focus the sourcing review on the relevant version.
When a suffix or package note is incomplete, the response records the open difference and requests buyer confirmation before procurement proceeds.
Packing format, carton notes, invoice details, courier option, destination, and tracking handoff are coordinated around the confirmed order.
The request connects the previously used model, current demand, package evidence, target timing, and replenishment sourcing route.
Related products
Packaged components ready for RFQ.
