The **O2CZ9.1Z** is a specific type of **Zener Diode** manufactured by Toshiba. It belongs to the O2CZ series and is primarily used for voltage regulation and surge protection in compact electronic circuits. ### 1. General Specifications The part number provides specific information about its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Component Type** | Zener Diode | | **Nominal Zener Voltage ($V_z$)** | 9.1 Volts | | **Power Dissipation ($P_d$)** | 200 mW (milliwatts) | | **Package Type** | USC (Ultra Super Mini) - similar to SOD-323 | | **Mounting Type** | Surface Mount Device (SMD) | | **Configuration** | Single Diode | --- ### 2. Key Characteristics * **Voltage Regulation:** The primary function is to maintain a constant voltage of 9.1V across its terminals when biased in the reverse direction. * **Small Footprint:** The USC package is designed for high-density mounting in portable devices like smartphones and tablets. * **Low Leakage:** It features low reverse current ($I_r$) before reaching the breakdown voltage, ensuring efficiency. * **Z-Suffix Significance:** The "Z" usually denotes a specific classification for the zener voltage tolerance (typically within a tight range). --- ### 3. Pinout and Circuit Symbol The O2CZ9.1Z is a two-terminal device: 1. **Anode:** The positive lead (usually unmarked). 2. **Cathode:** The negative lead (indicated by a color band/line on the body). ```text Cathode (K) Anode (A) [ | ]---------------|<|---------------[ ] (Line) Zener Symbol ``` --- ### 4. Typical Applications * **Voltage Stabilization:** Used in power supply circuits to provide a stable reference voltage. * **Overvoltage Protection:** Protects sensitive ICs by shunting excess voltage to ground if the line exceeds 9.1V. * **Waveform Clipping:** Used in signal processing to limit the amplitude of a signal.