The **ZD4.3L-CL2-R** is a specific type of Surface Mount Device (SMD) Zener Diode, typically used for voltage regulation and circuit protection. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. General Overview The ZD4.3L-CL2-R belongs to the Zener Diode family. Its primary function is to allow current to flow in the reverse direction when a specific "Zener voltage" is reached, making it ideal for stabilizing low-voltage rails. ### 2. Technical Specifications Based on the part number nomenclature (common in manufacturers like **Comchip Technology** or **Rohm**), here are the typical parameters: | Parameter | Value / Description | | :--- | :--- | | **Zener Voltage ($V_z$)** | 4.3V (Nominal) | | **Power Dissipation ($P_d$)** | 200mW - 500mW (Depends on package size) | | **Package Type** | SOD-323 or SOD-523 (Ultra-small SMD) | | **Voltage Tolerance** | $\pm$ 5% (Standard) | | **Mounting Type** | Surface Mount (SMT) | | **Operating Temperature** | -55°C to +150°C | --- ### 3. Key Electronic Characteristics * **Low Zener Voltage:** At 4.3V, this diode is often used in logic-level circuits (e.g., protecting 3.3V or 5V lines). * **Zener Knee:** Like most low-voltage Zeners (< 5V), the "knee" (the point where it starts conducting in reverse) is relatively soft compared to higher voltage diodes. * **CL2-R Suffix:** * **CL:** Often refers to specific lead-free or halogen-free compliance. * **R:** Generally indicates that the component is supplied on a **Tape & Reel** for automated pick-and-place assembly. ### 4. Typical Applications 1. **Voltage Regulation:** Providing a stable 4.3V reference for sensors or integrated circuits. 2. **Overvoltage Protection:** Acting as a "clamp" to prevent voltage spikes from reaching sensitive components. 3. **Level Shifting:** Used in signal conditioning to limit the amplitude of an input signal. ### 5. Circuit Symbol & Polarity In a circuit diagram, the Zener diode is represented by the standard diode symbol with "wings" on the cathode bar. ```text (Anode) ----|>|---- (Cathode) / ``` *Note: In reverse bias (regulation mode), the positive voltage is applied to the Cathode.* ---