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FUXINSEMI LL4148
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- FUXINSEMI LL4148
- Type
- FUXINSEMI
- Minimum package
- 2500 卷
Technical parameters
- Electronic Component
- FUXINSEMI
- Electronic Component
- LL4148
- Electronic Component
- 1
- Package
- LL-34(SOD-80)
- Electronic Component
- Switch Diode
- Electronic Component
- 0.053g
- Electronic Component
- 1
- Electronic Component
- BM0230032090
- Current
- 150mA
- Diode
- 1
- Current(Ir)
- 5uA@75V
- (Vf)
- 1V@10mA
- Power Dissipation(Pd)
- 500mW
- Electronic Component
- Electronic Component
- Electronic Component
- 2500
- Voltage Rating(Vr)
- 75V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LL4148（FUXINSEMI 富芯森美）产品概述
一、产品简介
LL4148 是一款小信号高速开关二极管，由 FUXINSEMI（富芯森美）生产，封装为 LL-34（SOD-80）。本器件在 10 mA 正向电流时正向压降约 1.0 V，直流反向耐压可达 75 V，直流整流电流 150 mA，耗散功率 500 mW，反向电流 5 μA（@75 V），反向恢复时间 4 ns，非重复峰值浪涌电流 2 A。该组合参数使其在高速开关和小信号处理场合表现出色。
二、电气特性与设计意义
- 正向压降 Vf = 1.0 V（@10 mA）：在中小电流下压降较低，有助于减少信号失真和功耗。
- 反向耐压 Vr = 75 V 与反向电流 Ir = 5 μA（@75 V）：在高电压偏置下仍保持低漏电，适合需要高耐压与低漏电的采样、检测电路。
- 整流电流 150 mA 与耗散功率 500 mW：适用于持续小电流传输与脉冲工作，但应注意功耗限值并进行散热设计。
- 反向恢复时间 Trr = 4 ns：开关速度快，适用于 MHz 级别的开关、脉冲整形与高速数字电路。
- 峰值浪涌 Ifsm = 2 A：允许短时间脉冲浪涌，但不可作为长期过流依据。
三、封装与机械特性
LL-34 / SOD-80 小型表面贴装封装，体积小、适合集成密集线路板。该封装利于自动贴装与回流焊工艺，推荐在 PCB 设计时留出适当的过孔/铜箔以改善散热。器件两端引脚距短，注意焊接时避免焊盘过大导致热量集中。
四、典型应用场景
- 高速开关与脉冲电路：逻辑电平转换、脉冲整形、时钟信号整形。
- 小信号检测与信号复位：前置放大后的整流、采样保持电路中的检波二极管。
- 保护与钳位：输入防浪涌、ESD 旁路（需与限流元件配合）。
- 通信与仪表：接收机前端的小电流开关与混频器保护。
五、使用建议与可靠性注意
- 功耗管理：器件 Pd = 500 mW，在实际电路中应保证结温与环境温度在安全范围内，通过减少平均电流或在 PCB 上增加散热铜箔来降温。
- 金属包覆与回流焊：遵循厂商推荐的焊接曲线，避免过长高温暴露以防封装损伤。
- 浪涌与脉冲：允许短脉冲 Ifsm 2 A，但应避免重复高幅值浪涌，设计时加入限流或熔断保护。
- 静电与安装：小信号二极管对静电较敏感，操作时做好防静电措施。
六、选型与替代
LL4148 常作为 1N4148 的表贴等效型号选用。若需更低漏电、更高耐压或更快恢复时间，可参考同类高速开关二极管规格并比较 Vf、Ir、Trr 与 Pd 等关键参数。采购时注意厂商型号与封装一致性（FUXINSEMI 标注、LL-34 封装），并确认包装方式（散装/卷带）以匹配生产装配需求。
如果需要，我可以根据您的电路工作条件（电流、频率、环境温度）给出更精确的热耗、去耦与保护元件建议。
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