The **MMBT5089G-AE3-R** is a high-gain, low-noise NPN Silicon Epitaxial Planar Transistor. It is primarily designed for low-level, low-noise amplifier applications where signal integrity is critical. --- ### 1. Key Technical Specifications The following table summarizes the absolute maximum ratings and electrical characteristics: | Parameter | Symbol | Rating/Value | | :--- | :--- | :--- | | **Collector-Emitter Voltage** | $V_{CEO}$ | 25 V | | **Collector-Base Voltage** | $V_{CBO}$ | 30 V | | **Emitter-Base Voltage** | $V_{EBO}$ | 4.5 V | | **Collector Current (DC)** | $I_C$ | 50 mA | | **DC Current Gain** | $h_{FE}$ | 400 - 1200 (at $I_C = 100\mu A$) | | **Noise Figure** | $NF$ | 2.0 dB (Max) | | **Transition Frequency** | $f_T$ | 50 MHz (Min) | | **Package Type** | SOT-23 | Small Outline Transistor | --- ### 2. Functional Description The MMBT5089G is characterized by its exceptionally high DC current gain ($h_{FE}$) even at very low collector currents. This makes it an ideal choice for the input stages of sensitive electronic circuits. * **Low Noise Performance:** With a noise figure typically below 2.0 dB, it ensures minimal interference is added to the signal during amplification. * **Small Footprint:** The SOT-23 package (denoted by "AE3" in the part number) is optimized for high-density surface-mount PCB designs. * **Green Compliance:** The "G" suffix typically indicates a "Green" (Halogen-free and RoHS compliant) component. --- ### 3. Application Areas Because of its specific gain and noise profile, this transistor is commonly found in: * **Audio Preamplifiers:** Used in microphone or guitar pickup circuits. * **Signal Processing:** Initial stages of sensor signal conditioning. * **Low Power Wireless:** Low-frequency RF amplification where low noise is required. --- ### 4. Pin Configuration (SOT-23) ```text (3) Collector | +----+----+ | | | | +----+----+ | | (1) Base (2) Emitter ```