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FOSAN C945
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- FOSAN C945
- Type
- FOSAN
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- FOSAN
- Electronic Component
- C945
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- 1 NPN
- Electronic Component
- Transistor(BJT)
- Electronic Component
- 0.034g
- Electronic Component
- 1
- Electronic Component
- BM0264886267
- Transistor Type
- NPN
- Frequency(f T)
- 250MHz
- Power Dissipation(Pd)
- 225mW
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
- Collector Current(Ic)
- 150mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
C945（FOSAN 富信）SOT-23 三极管产品概述
一、产品概述
C945 为一款小信号 NPN 双极型晶体管，FOSAN（富信）品牌，封装为 SOT-23。器件面向低功耗开关与小信号放大场合，具有高直流电流增益与良好的高频特性，便于表面贴装与自动化生产。数量：1个 NPN。
主要参数（典型/最大值）
- 集电极电流 Ic：150 mA
- 集-射击穿电压 Vceo：50 V
- 功耗 Pd：225 mW
- 直流电流增益 hFE：400
- 特征频率 fT：250 MHz
- 集电极截止电流 Icbo：100 nA
- 集-射极饱和电压 VCE(sat)：300 mV
- 发-基击穿电压 Vebo：5 V
二、主要特性与优势
- 高增益：hFE 高达 400，适合要求较大电压或电流增益的前级放大与电压放大器。
- 高频响应：fT ≈ 250 MHz，适用于音频到低中频射频放大器的应用边界。
- 低饱和压降：VCE(sat)≈300 mV，使得在开关应用中功耗降低。
- SOT-23 小型封装：适合紧凑型电路板与表贴工艺，便于量产。
三、典型应用场景
- 低功耗开关：驱动小继电器、光耦输入或作为数字逻辑接口的电平转换器（注意总电流与功耗限制）。
- 小信号放大：前置放大、音频放大器输入级、传感器信号放大等。
- 高频放大/缓冲：在 fT 范围内可用于高频缓冲或中低频射频链路。
- 旁路/偏置电路：电压放大器的偏置与电流镜等模拟电路。
四、使用建议与注意事项
- 功耗与散热：Pd 为 225 mW（SOT-23 封装受限），在 PCB 设计中应考虑良好散热与减少结温上升，必要时增加铜箔面积或散热垫。
- 偏置与稳定性：高 hFE 会导致偏置点敏感，建议在放大器设计中使用负反馈或稳定偏置网络，避免温漂与热失控。
- 漏电流影响：Icbo 为 100 nA，温度升高时漏电流增加，低频高阻输入电路需注意漏电影响。
- 结压限制：Vceo 50 V 与 Vebo 5 V，应避免基极-发射极或集极-射极超过最大额定值，防止击穿损坏。
- 引脚及封装：SOT-23 的引脚排列可能随生产厂不同而异，使用前请参照 FOSAN 的完整数据手册确认管脚定义、最大额定值和典型特性。
五、封装、焊接与可靠性
SOT-23 小封装适合回流焊工艺。焊接注意事项包括：
- 避免过高的回流峰值温度或超出厂家推荐的温度曲线；
- 贴片时确保焊盘与焊锡量匹配以免应力集中；
- 存储与搬运过程中防静电 ESD 保护，毕竟小信号晶体管对静电敏感。
总结：C945（FOSAN，SOT-23）是一款面向低功耗开关与小信号放大的高增益 NPN 晶体管，适用于多种消费类与工业电子场合。设计应用时请结合 FOSAN 官方数据手册进行参数核对与热设计。
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