Description
The 6.8V 0.5W Zener diode is a highly reliable component, often preferred for voltage regulation in low-power circuits due to its excellent thermal stability. The most common industry-standard part number for this specification is the 1N5235.
Technical Specifications
| Parameter | Specification |
| Nominal Zener Voltage ($V_Z$) | 6.8V |
| Power Dissipation ($P_D$) | 0.5W (500mW) |
| Package Type | DO-35 (Small Glass Axial) |
| Tolerance | $\pm 5\%$ |
| Operating Temperature | -65°C to +200°C |
Understanding the Zener Principle
This component is designed to operate in the reverse breakdown region. When the voltage applied to the cathode (banded end) exceeds 6.8V, the diode begins to conduct, effectively “clamping” the potential to 6.8V by shunting excess current to ground.
To function as a regulator, you must install the diode in reverse bias and include a series current-limiting resistor ($R_s$). This is critical: without this resistor, the diode would draw unregulated current, exceed its 500mW power limit, and likely fail as a short circuit.
Application & Safety Guidelines
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Thermal Management: To keep this 500mW device safe, ensure the current ($I_Z$) flowing through it does not exceed the limit. Using the formula $I_{Zmax} = P_D / V_Z$, your maximum current should be kept below ~73mA ($0.5W / 6.8V$).
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Procurement: You requested 2 pieces. These are widely available; search for “1N5235” to find this exact specification.
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Troubleshooting: If the voltage on your 6.8V rail is zero or lower than expected, check the Zener diode. A failed Zener diode typically measures as a dead short (near 0 ohms) in both directions on a multimeter.
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