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DOWO MMBT3904
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO MMBT3904
- Type
- DOWO
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- MMBT3904
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- 1 NPN
- Electronic Component
- Transistor(BJT)
- Electronic Component
- 0.032g
- Electronic Component
- 1
- Electronic Component
- BM0264866314
- Transistor Type
- NPN
- Frequency(f T)
- 300MHz
- Power Dissipation(Pd)
- 200mW
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
- Collector Current(Ic)
- 200mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
MMBT3904产品概述
一、产品简介
MMBT3904（DOWO/东沃品牌，封装：SOT-23）是一款通用小信号NPN晶体管，单只件（数量：1）。器件具有工作电流高达200mA、集—射击穿电压Vceo为40V，适用于放大与开关场合。体积小、频率响应好、成本低，是常见的电子设计替代与通用选择。
二、主要性能参数
- 晶体管类型：NPN
- 最大集电极电流 Ic：200mA
- 集—射击穿电压 Vceo：40V
- 耗散功率 Pd（封装SOT-23）：200mW（环境依赖）
- 直流电流增益 hFE：典型300（工作点相关）
- 特征频率 fT：约300MHz
- 集电极截止电流 Icbo：约100nA（典型）
- 集—射极饱和电压 VCE(sat)：约300mV（典型）
- 射—基击穿电压 Vebo：6V
以上参数为典型/最大值，设计时请参考厂家数据表以获得详细测试条件。
三、引脚与封装说明
封装：SOT-23（小型3引脚）。常见引脚分配（请以具体器件数据表为准）：
- 引脚1：B（基极）
- 引脚2：C（集电极）
- 引脚3：E（发射极）
SOT-23体积小，利于表面贴装（SMT）生产，适合空间受限的电路板设计。
四、典型应用
- 小信号放大器（音频前级、射频前端低功率放大）
- 通用开关（逻辑电平驱动、继电器/小电机驱动的前级）
- 电平转换与缓冲器
- 恒流源、温度传感与简单振荡器电路
得益于fT≈300MHz，适合低中频率段的放大与开关应用。
五、使用建议与注意事项
- 由于Pd仅200mW，长期大电流工作需注意功耗与结温，尽量降低Vce上的功耗（采用饱和开关或外加散热铜箔）。
- hFE为典型值，随Ic和温度变化大；在精确偏置电路中需留裕量或选用反馈稳定电路。
- VCE(sat)约300mV，作为低压差开关时应根据驱动电流与饱和条件评估功耗与电压降。
- 漏电流（Icbo）随温度上升增加，温度敏感应用需考虑偏置点漂移。
- 引脚排列与封装标识在不同厂家细节可能不同，生产前务必核对东沃数据手册与PCB封装库。
六、热管理与可靠性
在SOT-23封装下，热阻较大，建议：
- 在PCB设计中增加顶层/底层铜箔作为散热路径；
- 对于连续接近最大Ic的工作，采取降低占空比或外加散热处理；
- 在高温环境中进行热降额设计，保证结温不超过允许范围以延长寿命。
七、采购与替代
DOWO(东沃) MMBT3904（ SOT-23）适合大批量SMT装配。若需要更高功耗或不同封装，可选TO-92或功率更高的替代型号。购买时注意批次与管脚排列，索取并参照东沃官方数据手册以确保参数与封装一致。
如需示例电路图、PCB封装建议或基于该型号的偏置计算，可提供工作电压与负载条件，我将给出更详细的设计指导。
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