## 2N5089L-T92-R Overview The **2N5089L-T92-R** is a high-gain, low-noise NPN silicon epitaxial planar transistor. It is specifically designed for applications requiring high signal amplification with minimal added noise, making it a staple in audio pre-amplifiers and signal processing circuits. --- ### 1. Key Technical Specifications The following table summarizes the absolute maximum ratings and primary electrical characteristics of the 2N5089L. | Parameter | Symbol | Maximum Rating | Unit | | :--- | :---: | :---: | :---: | | Collector-Emitter Voltage | $V_{CEO}$ | 25 | V | | Collector-Base Voltage | $V_{CBO}$ | 30 | V | | Emitter-Base Voltage | $V_{EBO}$ | 3.0 | V | | Collector Current (DC) | $I_C$ | 50 | mA | | Power Dissipation ($T_a = 25^\circ C$) | $P_D$ | 625 | mW | | DC Current Gain ($I_C = 100\mu A$) | $h_{FE}$ | 400 - 1200 | - | | Noise Figure | $NF$ | 2.0 (Max) | dB | --- ### 2. Physical and Packaging Data The suffix **"T92-R"** provides specific information regarding the physical form factor and packaging: * **T92 (TO-92):** This refers to the standard plastic encapsulation package. It is a three-lead through-hole package commonly used for small-signal transistors. * **R (Tape & Reel):** Indicates the packaging method for automated assembly. The "R" usually signifies that the parts are supplied on a reel rather than in bulk bags or ammo packs. * **L (Lead-Free):** Often denotes that the component is compliant with RoHS standards (Lead-free/Green). --- ### 3. Pin Configuration (TO-92) When looking at the flat side of the transistor with the leads pointing downwards, the pinout is typically as follows: | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | **Emitter** | Current exits the transistor | | 2 | **Base** | Controls the collector-emitter current | | 3 | **Collector** | Current enters the transistor | --- ### 4. Typical Applications Due to its high gain ($h_{FE}$) and low noise characteristics, the 2N5089L is frequently found in: * **Guitar Pedals:** Specifically fuzz faces and boosters where high gain is needed. * **Microphone Preamps:** Where maintaining signal integrity and low hiss is critical. * **Sensor Amplification:** Scaling low-voltage signals from sensors for microcontroller input. --- ### 5. Equivalent Alternatives If the 2N5089L is unavailable, the following transistors are common substitutes (note: check pinouts as they may differ): * **2N5088:** Slightly lower gain/higher noise floor but very similar. * **BC550:** A popular low-noise NPN alternative (European pinout). * **MPSA18:** Very high gain, low noise NPN transistor.