The **2SC5053** is a NPN epitaxial silicon transistor specifically designed for high-frequency applications, particularly in the VHF to UHF range. Below is a detailed technical breakdown based on the **REV 2008** specifications. --- ## 1. Device Overview The 2SC5053 is primarily used as a low-noise amplifier or a high-speed switch. Its high transition frequency makes it ideal for telecommunications equipment. ### Key Features * **High Gain-Bandwidth Product ($f_T$):** Typically around 5-7 GHz. * **Low Noise Figure:** Designed to minimize signal interference in RF stages. * **Small Package:** Usually found in a SOT-23 or SC-59 surface-mount package. --- ## 2. Absolute Maximum Ratings ($T_a = 25^\circ C$) | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | 20 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 12 | V | | Emitter-Base Voltage | $V_{EBO}$ | 3 | V | | Collector Current | $I_C$ | 30 | mA | | Total Power Dissipation | $P_C$ | 150 | mW | | Junction Temperature | $T_j$ | 150 | $^\circ C$ | --- ## 3. Electrical Characteristics These values define how the part performs under specific operating conditions. | Characteristic | Symbol | Condition | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Collector Cut-off Current | $I_{CBO}$ | $V_{CB}=10V, I_E=0$ | - | - | 0.1 | $\mu A$ | | DC Current Gain | $h_{FE}$ | $V_{CE}=10V, I_C=20mA$ | 50 | 120 | 250 | - | | Transition Frequency | $f_T$ | $V_{CE}=10V, I_C=20mA$ | - | 5.0 | - | GHz | | Output Capacitance | $C_{ob}$ | $V_{CB}=10V, f=1MHz$ | - | 0.6 | 1.0 | pF | --- ## 4. Typical Applications The 2SC5053_REV2008 is commonly integrated into the following circuits: 1. **RF Amplifiers:** Used in the front-end of radio receivers to boost weak signals. 2. **Oscillators:** Stable performance in local oscillators for mixers. 3. **Buffer Stages:** High input impedance and high frequency response make it suitable for isolating circuit stages. --- ## 5. Equivalent/Replacement Parts If the 2SC5053 is unavailable, the following NPN RF transistors are often considered (check pinouts and $V_{CEO}$ limits): * **BFP193** * **2SC3356** * **BFG67**