## Technical Overview: 2SC5658-R_13 The **2SC5658-R_13** is a small-signal, NPN epitaxial planar silicon transistor. It is widely used in high-frequency amplification and general-purpose switching applications due to its compact size and high reliability. --- ### 1. Key Specifications The following table outlines the absolute maximum ratings and primary electrical characteristics (at $T_a = 25^\circ C$): | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 50 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 50 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 7 | V | | **Collector Current** | $I_C$ | 150 | mA | | **Power Dissipation** | $P_d$ | 150 | mW | | **Transition Frequency** | $f_T$ | 180 | MHz | | **DC Current Gain** | $h_{FE}$ | 180 to 390 (R Rank) | - | --- ### 2. Functional Description * **Polarity:** NPN (Negative-Positive-Negative). It requires a positive voltage at the base relative to the emitter to "turn on." * **Gain Classification:** The suffix **"R"** denotes the DC current gain ($h_{FE}$) range, which typically falls between **180 and 390**. * **Packaging:** Usually comes in the **EMT3 (SOT-416)** package, which is an ultra-small surface-mount device (SMD). This makes it ideal for space-constrained PCB designs. --- ### 3. Application Areas The 2SC5658 is versatile and can be found in various electronic circuits: 1. **High-Frequency Amplification:** Used in radio frequency (RF) stages or intermediate frequency (IF) circuits. 2. **Switching:** Acts as a small switch for controlling low-power LEDs, relays, or logic level shifting. 3. **Signal Buffering:** Used in audio and sensor circuits to prevent signal degradation. --- ### 4. Comparison with Equivalents If you are looking for alternatives, these transistors share similar characteristics but may differ in package size: | Part Number | Package | Comparison | | :--- | :--- | :--- | | **2SC4081** | SOT-23 | Larger package, similar electricals | | **2SC4617** | SC-70 | Medium package, high reliability | | **BC847** | SOT-23 | General purpose European equivalent | --- ### 5. Typical Circuit Connection Below is a simple representation of the pinout for the EMT3 package: ```text [ 3 ] <-- Collector / \ [ 1 ]-------[ 2 ] ^ ^ Base Emitter ```