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muRata BLM15EX121SN1D
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- mu Rata BLM15EX121SN1D
- Type
- MURATA
- Unit
- Electronic Component
- Minimum package
- 10000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- MURATA
- Electronic Component
- BLM15EX121SN1D
- Electronic Component
- 1
- Package
- 0402
- Electronic Component
- Ferrite Bead
- Electronic Component
- ±25%
- Electronic Component
- 0.015g
- Electronic Component
- 1
- Channel Count
- 1
- Electronic Component
- BM0257274321
- Operating Temperature
- 55℃~+125℃
- Current
- 1.8A
- @Frequency
- 120Ω@100MHz
- Resistor(DCR)
- 75mΩ
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
muRata BLM15EX121SN1D 产品概述
一、概述与主要参数
BLM15EX121SN1D 为村田（muRata）生产的表面贴装磁珠，用于高频噪声抑制与电源/信号线的射频干扰滤除。主要参数如下：
- 阻抗：120Ω @ 100MHz（允许误差 ±25%）
- 直流电阻（DCR）：约 75mΩ
- 额定电流：1.8A（连续通流能力）
- 通道数：1（单端）
- 工作温度：-55℃ ~ +125℃
- 封装：0402（约 1.0 × 0.5 mm）
该器件适合在限定电流下提供高频阻抗，有效衰减 10MHz~数百MHz 范围内的干扰。
二、性能特点与工作原理
磁珠以磁性材料的磁滞和涡流损耗将高频噪声能量转化为热量，因此在高频段呈现阻抗而在直流/低频段阻抗很小。BLM15EX121 在 100MHz 附近阻抗为 120Ω，适合用于电源滤波、信号线 EMI 抑制及共模/差模噪声控制。DCR 低（75mΩ）可减少压降与功率损耗，支持较高的连续电流。
三、典型应用场景
- 手机、无线模块、蓝牙/ Wi‑Fi 射频前端及供电线滤波
- MCU、电源稳压器与 LDO 输出侧的去耦与噪声抑制
- 摄像头、传感器接口与高速信号线的局部 EMI 抑制
该器件尤其适用于对体积要求严格的便携式设备和高速数字系统。
四、PCB 布局与安装建议
- 尽量靠近噪声源（如电源引脚、芯片供电端）放置，以缩短回流路径。
- 两端焊盘应保持足够覆铜面积以便散热与机械可靠性，推荐遵循厂商推荐焊盘尺寸。
- 使用标准回流焊温度曲线进行贴装，避免超温或过度热循环导致性能退化。
- 为保证阻抗特性，避免在器件附近切割地平面或引入不必要的长导线。
五、注意事项与可靠性
- 磁珠的阻抗随直流偏置电流和温度会下降，设计时应考虑在工作电流下的实际阻抗。
- 长时间大电流通过会产生热量，需评估环境温升与热循环对寿命的影响。
- 使用过程中应避免超过最大工作温度（+125℃）及机械应力导致裂纹。
- 在关键应用中建议进行实际电路板级验证（阻抗测试、EMI 测试、温升测量）。
六、替代与选型建议
选型时可考虑阻抗曲线、额定电流与封装尺寸的平衡：若需要更高电流或更大阻抗，可查看 BLM 系列其他阻值/尺寸产品。对于对称差模滤波，可采用配对或共模滤波方案替代单磁珠。
总结：BLM15EX121SN1D 以其在 100MHz 附近较高阻抗、低 DCR 与 0402 小封装的组合，适合便携设备与高速电路中的局部 EMI 抑制与电源噪声治理。选型时重点关注实际工作电流下阻抗衰减与热管理设计。
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