## MMBT5401-AE3-R: Electronic Specifications and Details The **MMBT5401-AE3-R** is a high-voltage PNP epitaxial silicon transistor designed for general-purpose switching and amplification applications. It is the surface-mount (SMD) equivalent of the popular 2N5401 through-hole transistor. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the device: | Parameter | Symbol | Maximum Rating | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | -160 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | -150 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | -5.0 | V | | **Collector Current (DC)** | $I_C$ | -600 | mA | | **Total Device Dissipation** | $P_D$ | 350 | mW | | **Operating Temperature** | $T_J$ | -55 to +150 | °C | --- ### 2. Physical and Packaging Information The "AE3-R" suffix typically refers to the package type and reel tape specifications provided by the manufacturer (often UTC - Unisonic Technologies). * **Package Type:** SOT-23 (Small Outline Transistor) * **Mounting Type:** Surface Mount (SMD) * **Pinout:** 1. **Base** 2. **Emitter** 3. **Collector** --- ### 3. Electrical Performance (Typical) * **DC Current Gain ($h_{FE}$):** Typically ranges from 60 to 240, depending on the collector current. * **Current Gain Bandwidth ($f_T$):** 100 to 300 MHz, making it suitable for high-frequency signal processing. * **Saturation Voltage ($V_{CE(sat)}$):** Low saturation (approx. -0.2V to -0.5V), which ensures efficiency in switching states. --- ### 4. Common Applications Due to its high voltage rating, this transistor is frequently used in the following circuits: 1. **High Voltage Switching:** Controlling loads that exceed the voltage limits of standard transistors (e.g., small motors, relays). 2. **Audio Amplifiers:** Used in the driver stages or input stages of power amplifiers. 3. **Telecom Equipment:** High-voltage line interface circuits. 4. **Signal Processing:** General amplification in circuits where high rails are present. --- ### 5. Complementary Part The **MMBT5401** (PNP) is often paired with the **MMBT5551** (NPN) for push-pull amplifier configurations and complementary switching circuits.