Description
Technical Overview
The C4V7 is designed for voltage regulation and transient suppression. It is widely used to protect sensitive input pins on microcontrollers or as a stable voltage reference for analog-to-digital converters (ADCs).
Technical Specifications
| Parameter | Specification |
| Nominal Zener Voltage ($V_Z$) | 4.7V |
| Power Dissipation ($P_D$) | 500mW (0.5W) |
| Package Type | DO-35 (Glass Axial Lead) |
| Tolerance | $\pm 5\%$ |
| Operating Temperature | -65°C to +200°C |
Understanding the Zener Principle
The C4V7 operates in reverse bias. When the voltage applied across the diode reaches 4.7V, it enters the Zener breakdown region. At this point, the diode begins to conduct significant current to ground, which prevents the voltage across the diode from increasing further.
This behavior creates a “clamping” effect that is essential for protecting circuits from overvoltage. By using the Zener diode in parallel with your load, you ensure the voltage remains fixed at 4.7V, provided that you have a current-limiting resistor in series with the power source.
Application & Replacement Notes
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Signal Protection: If this component is used on a data line, it will effectively “clip” any voltage spikes that exceed 4.7V.
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Component Replacement: When sourcing a replacement, look for a 4.7V, 500mW Zener diode in a DO-35 package.
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Thermal Safety: Because this is a 500mW device, you must ensure the circuit design does not allow the diode to exceed its power dissipation limit ($P = V_Z \times I_Z$).
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