The **VDZ 6.8B** is a specific type of **Zener Diode** commonly used in surface-mount electronic circuits for voltage regulation and protection. It is part of the VDZ series manufactured by ROHM Semiconductor. --- ### ## Technical Specifications The following table highlights the key electrical characteristics of the VDZ 6.8B: | Parameter | Symbol | Value / Range | | :--- | :--- | :--- | | **Zener Voltage** | $V_z$ | 6.47V to 7.14V (Nominal: 6.8V) | | **Power Dissipation** | $P_d$ | 100 mW | | **Reverse Current** | $I_r$ | 0.5 $\mu$A (at $V_r$ = 3.5V) | | **Dynamic Impedance** | $Z_z$ | 40 $\Omega$ | | **Package Type** | SMT | VMN2 (SOD-923 equivalent) | | **Operating Temperature** | $T_{stg}$ | -55°C to +150°C | --- ### ### Key Features * **Ultra-Small Package:** The VMN2 package is extremely compact, making it ideal for high-density circuit boards in smartphones and wearables. * **High Reliability:** Designed for stable breakdown characteristics across its temperature range. * **Silicon Epitaxial Planar Structure:** Ensures precise control over the Zener voltage. ### ### Common Applications 1. **Voltage Regulation:** Maintaining a constant 6.8V output in low-power circuits despite fluctuations in input voltage. 2. **Surge Protection (ESD):** Protecting sensitive IC pins from electrostatic discharge or minor voltage spikes. 3. **Voltage Referencing:** Providing a stable reference point for analog-to-digital converters (ADCs) or operational amplifiers. --- ### ### Circuit Symbol and Orientation In a schematic, the VDZ 6.8B is represented by the standard Zener Diode symbol. Note that for voltage regulation, it is **Reverse Biased** (the cathode is connected to the positive rail). ``` (Positive Rail) | | [R] <-- Current Limiting Resistor | +---- Output (Stable 6.8V) | _|_ /_\ <-- VDZ 6.8B (Zener Diode) | | (Ground/Negative) ```