Description
The marking “C3V6” identifies a 3.6V Zener diode. In the industry-standard nomenclature for Zener diodes (like the BZX79 series), the “V” acts as a decimal point, making the voltage value clear and unambiguous.
Technical Overview
The C3V6 is a low-voltage Zener diode designed for precision voltage regulation and signal clipping in sensitive electronic circuits. Because 3.6V is a common threshold for digital logic levels (such as 3.3V or 3.6V logic families), this component is frequently used to clamp signals to protect microcontrollers and digital ICs from overvoltage.
Technical Specifications
| Parameter | Specification |
| Nominal Zener Voltage ($V_Z$) | 3.6V |
| Power Dissipation ($P_D$) | 500mW |
| Package Type | DO-35 (Glass Axial Lead) |
| Tolerance | $\pm 5\%$ |
| Operating Temperature | -65°C to +200°C |
Understanding the Zener Breakdown
At low voltages (below 5V), Zener diodes often operate via a combination of the Zener effect and the Avalanche effect. For a 3.6V Zener, the “knee” of the breakdown curve is typically very sharp, which is excellent for defining a stable voltage reference for analog-to-digital converters (ADCs) or clamping digital data lines to prevent signal overshoot.
Application & Replacement Notes
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Signal Protection: If this diode is connected to an input pin of a microcontroller, its purpose is to “clip” any incoming voltage spikes that exceed 3.6V, ensuring the chip’s internal circuitry is not damaged.
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Component Form Factor: The C3V6 almost exclusively uses the DO-35 glass package. When replacing this component, ensure the replacement is also a 500mW (0.5W) Zener to prevent the device from failing due to thermal overload.
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Replacement Check: If you are substituting this, you can use any standard BZX79-C3V6 or equivalent 3.6V 500mW Zener diode.
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