MMBT3906


PNP 40V 200mA、hFE 100-300、fT 250MHz、SOT-23、与 MMBT3904 互补、通用开关器件

80000

有效库存
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制造商零件:

MMBT3906

包装:

SOT-23 (TO-236)(2.9 x 1.3 x 1.0 毫米,1.9 毫米间距)

品牌:
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说明

MMBT3906 是一款通用 PNP 开关晶体管,采用 SOT-23 表面贴装封装。主要规格包括 -40 V 的 VCEO、-200 mA 的连续集电极电流、IC = -10 mA 时 100-300 的直流电流增益 (hFE)、250 MHz 的转换频率 (fT) 和 250 mW 的总功耗。互补 NPN 型是 MMBT3904。可从 Nexperia、Diodes Inc 和 onsemi 等多家制造商处购买。AEC-Q101 合格变体可用于汽车应用。工作结温范围为 -55°C 至 +150°C。.

MMBT3906 是业界标准的 PNP 通用开关晶体管,采用 SOT-23 表面贴装封装,是同样普遍的 MMBT3904(NPN)的互补对。它是电子产品中应用最广泛的分立晶体管之一,从消费电子产品到工业系统,几乎每一类产品中都有它的身影。.

该器件的 VCEO 为 -40 V,IC 为 -200 mA,可满足大多数低功耗开关和信号放大需求。在 IC = -10 mA(A 级)时,hFE 为 100 至 300,为小信号应用提供了充足的增益。在较高电流(IC = -100 mA)条件下,hFE 最低降至 30,在饱和开关设计中必须考虑到这一点。.

250 MHz 的过渡频率使 MMBT3906 适用于高达约 25 MHz 的射频和高速开关应用(实际规则为 fT 的 1/10)。开关时间快:IC = -10 mA 时,延迟 35 ns,上升 35 ns,存储 225 ns,下降 75 ns。.

SOT-23 封装是尺寸最小的普通晶体管,仅为 2.9 x 1.3 毫米。250 mW 的功率耗散(在标准 FR4 上,环境温度为 25°C)限制了该器件在小信号和低功率开关方面的应用。如需更高功率,可选择通孔型 2N3906 (TO-92) 或 SOT-223 变体。.

MMBT3906 是一种多源元件,可从 Nexperia、Diodes Inc、onsemi、英飞凌等公司获得。大多数制造商都为汽车应用提供符合 AEC-Q101 标准的变体(MMBT3906Q 或 MMBT3906-Q)。该器件还采用卷带包装(每卷 7 英寸,每卷 3,000 件),适用于自动装配。.

**PNP 双极结型晶体管:** MMBT3906 采用平面外延 PNP 结构。当基极(N)相对于发射极偏置为负时,电流从发射极(P)流向集电极(P)。基极电流以增益系数 hFE 调节集电极电流。在有源区,IC = hFE × IB;在饱和区,VCE 下降到 VCE(sat)(通常在 IC = -10 mA,IB = -1 mA 时为 -250 mV)。.

**开关操作:** 对于饱和开关,基极会被过度驱动(IB > IC/hFE),以尽量减少 VCE(饱和)和功率耗散。接通延迟和上升时间主要由基极电荷存储积累决定。关断涉及消除存储的基极电荷(存储时间,225 ns),然后是集电极电流下降(下降时间,75 ns)。反向基极电流 (IB2) 通过主动消除存储电荷,加快关断速度。.

**放大器操作:** 在线性区域,MMBT3906 利用集电极负载电阻偏置时提供电压放大。250 MHz fT 和低噪声(IC = -100 µA 时为 4 dB)使其适用于音频和中频放大器级。hFE 变化(100-300)要求精心设计偏置,通常使用发射极变性或反馈来稳定工作点。.

**互补对:** MMBT3906(PNP)和 MMBT3904(NPN)具有匹配的特性(相同的 VCEO、IC 和 fT),可实现推挽式放大器输出级、H 桥电机驱动器和具有对称性能的互补电流镜。.

针脚 名称 类型 说明
1 B(底座) I 基极;控制集电极电流;IC=-10mA 时,典型 VBE(饱和)=-0.85V;输入阻抗 ~kΩ 范围;必须使用串联电阻限流
2 E(发射器) 输入/输出 发射器;电流源端子;在 PNP 中为最正极;通过负载连接至电源轨,用于共发射极配置
3 C(收集器) 输入/输出 集电极;灌电流端;IC=-10mA 时 VCE(sat) = -250mV typ;连接至负载电阻;基板与所有端子隔离
应用 说明
逻辑级信号反转 来自 MCU GPIO 的反相逻辑信号;PNP 将有源低电平反相为有源高电平;基极电阻器设置开关速度和电流;VCE(sat) < 0.4V 提供干净的逻辑电平;互补 MMBT3904 创建非反相缓冲器对
负载开关(高压侧 PNP) 从正电源轨向负载切换电源;MCU 通过电阻器驱动基极;-200mA 最大负载电流适合 LED、继电器和小型电机;基极电阻器 = (VCC - VBE - VGPIO) / IB,其中 IB = IC / hFE(最小值)。
推挽式音频输出 与 MMBT3904 配对可实现 AB 类推挽放大器;匹配的 fT 和 VCEO 可确保对称的正/负半周;每个器件的最大电流为 200mA,将输出限制在 8Ω ~100mW 范围内;偏置二极管可防止分频失真
模型 制造商 兼容性 主要区别
MMBT3904 Nexperia 互补 NPN NPN 互补;相同的 VCEO(40V)、IC(200mA)、fT(250MHz);相同的 SOT-23 引脚输出;用于推挽对和互补电路
BC857B Nexperia 针脚兼容 PNP SOT-23;-45V/-100mA;更高的 hFE(220-475 B 组);更低的 fT(100MHz);更适合直流偏压;在低电流时需要更高增益时使用
MMBT4403 onsemi 针脚兼容升级 PNP SOT-23;-40V/-600mA;较高电流;150mA 时 hFE=100-300;当 200mA MMBT3906 电流不足时使用
2N3906 多个 功能等效,TH 通孔 TO-92 版本;电气规格相同;耗散功率 625mW(对 250mW);用于原型开发和手工组装
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