The **MMBTH10-X-AE3-R** is an NPN Silicon High-Frequency Transistor specifically designed for use in VHF and UHF amplification and oscillator circuits. It is a surface-mount version of the classic 2N918 transistor, optimized for low-noise and high-gain performance in radio frequency (RF) applications. --- ## 1. Technical Specifications Below are the key electrical characteristics of the device: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Emitter Voltage** | $V_{CEO}$ | 15 | V | | **Collector-Base Voltage** | $V_{CBO}$ | 25 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 3.0 | V | | **Continuous Collector Current** | $I_C$ | 50 | mA | | **Power Dissipation ($T_A=25^{\circ}C$)** | $P_D$ | 225 | mW | | **Current Gain-Bandwidth Product** | $f_T$ | 650 (Min) | MHz | | **DC Current Gain** | $h_{FE}$ | 60 - 150 | - | --- ## 2. Key Electronic Features * **High Frequency Capability:** With a transition frequency ($f_T$) typically exceeding 600 MHz, this transistor is ideal for FM radio, TV tuners, and high-speed switching. * **Low Capacitance:** It features low output capacitance ($C_{ob} \approx 1.7 pF$), which reduces signal feedback and improves stability at high frequencies. * **SOT-23 Package:** The "AE3" suffix refers to the SOT-23 surface-mount package, making it suitable for compact, automated PCB assembly. * **NPN Polarity:** Being an NPN type, it is controlled by a positive current at the base and is standard for ground-referenced circuits. --- ## 3. Part Number Breakdown (UTC Convention) The part number follows the **Unisonic Technologies (UTC)** naming scheme: 1. **MMBTH10**: The base model for the RF NPN Transistor. 2. **X**: Potential variation in gain ($h_{FE}$) ranking or specific internal testing. 3. **AE3**: Package code for **SOT-23**. 4. **R**: Packing code, typically meaning **Tape and Reel**. --- ## 4. Typical Applications * **RF Oscillators:** Used as the local oscillator in radio receivers. * **VHF Amplifiers:** Boosting signals in the Very High Frequency range. * **Mixer Circuits:** Combining signals in RF front-ends. * **High-Speed Switching:** Digital logic circuits requiring fast transition times. --- ## 5. Pinout Configuration (SOT-23) ```text (3) Collector | ----------- | (3) | | | | (1) (2) | ----------- | | Base Emitter ```