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LGE BC557B
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- LGE BC557B
- Type
- LGE
- Minimum package
- 1000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- LGE
- Electronic Component
- BC557B
- Electronic Component
- 1
- Package
- TO-92
- Electronic Component
- 1 PNP
- Electronic Component
- Transistor(BJT)
- Electronic Component
- 0.194g
- Electronic Component
- 1
- Electronic Component
- BM0230873943
- Transistor Type
- PNP
- Frequency(f T)
- 150MHz
- Power Dissipation(Pd)
- 625mW
- Electronic Component
- Electronic Component
- Electronic Component
- 1000
- Collector Current(Ic)
- 100mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
BC557B 产品概述
一、产品简介
BC557B 是一款通用的 PNP 小信号三极管，鲁光（LGE）品牌，封装为常见的 TO-92。器件设计用于中低功率放大与开关场合，具有较高的直流电流增益和良好的高频特性，适合音频、信号处理和常规电子电路中的小信号放大与电平转换应用。
二、主要参数
- 晶体管类型：PNP
- 集电极电流 Ic（最大）：100 mA
- 集-射极击穿电压 Vceo（最大）：45 V
- 耗散功率 Pd（总）：625 mW（TO-92 封装）
- 直流电流增益 hFE：约 180（典型值，测试条件 2 mA、Vce = 5 V）
- 特征频率 fT：150 MHz（典型）
- 集电极截止电流 Icbo：100 nA（典型/最大量级）
- 集电极饱和电压 VCE(sat)：约 650 mV（在一定偏置条件下的典型值）
- 射-基击穿电压 Vebo：5 V
三、性能特点
- 高增益：hFE 在低电流工作点（2 mA）下可达约 180，便于在小信号放大器中取得较大电压增益或用于电平放大。
- 高频响应良好：fT ≈ 150 MHz，适用于高频小信号放大与缓冲用途。
- 低漏电流：Icbo 约 100 nA，减少静态漏流，利于低功耗电路设计。
- 合理的耐压与电流能力：Vceo 45 V、Ic 100 mA，可胜任中等电压/电流的开关与放大任务。
四、典型应用场景
- 低功耗音频前级和信号放大器
- 电平转换、缓冲与偏置网络
- 通用开关电路（需注意功耗与饱和压）
- 高频小信号放大、振荡器输出级（视具体工作点）
- 与同类 NPN 器件配合构成互补放大电路
五、封装与引脚
- 封装：TO-92（塑封小三极管封装）
- 引脚排列（从正面看，按厂商标示为准）：通常为 C、B、E（请参照厂方数据手册确认具体引脚定义与外形尺寸）。
六、使用与热管理建议
- 功耗管理：Pd 为 625 mW，为保证长期可靠性，应在设计中做好散热与降额；环境温度升高时应按器件数据手册进行功率降额计算。
- 工作电流与饱和：若用于开关工作，注意 VCE(sat) 约 0.65 V（典型）会引入功耗，尽量提供足够基极驱动以降低饱和电阻。
- 保护措施：射-基击穿电压 Vebo = 5 V，避免基-射极过高反向电压；在有可能出现反向电压或浪涌的场合加保护二极管或限流元件。
- 测试与替代：在电路验证阶段以实际测量为准，不同生产批次参数有微小差异；可作为通用替代的 PNP 小信号管，置换时注意 hFE 和 Vceo 匹配。
七、结论
BC557B（鲁光 LGE，TO-92）是一款性能均衡的 PNP 小信号三极管，适合中小电流、中等电压的放大与开关应用。其高增益与良好的高频特性使其在音频与信号处理电路中具有广泛适用性。设计时应关注耗散功率与热降额、基极保护以及实际工作点下的饱和电压，以确保长期稳定可靠。若需严格参数或引脚尺寸，请参考厂方完整数据手册。
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