Description
The 51V 0.5W Zener diode is a specialized component used for high-voltage regulation, signal clipping, and protecting circuits from transient spikes. The most common industry-standard part number for this specification is the 1N5262.
Technical Specifications
| Parameter | Specification |
| Nominal Zener Voltage ($V_Z$) | 51V |
| 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 engineered to operate in the reverse breakdown region. When the voltage applied to the cathode (banded end) exceeds 51V, the diode begins to conduct, clamping the voltage at 51V 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 will draw unlimited current from your source, exceeding its 500mW power limit, and will likely fail as a permanent 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 ~9.8mA ($0.5W / 51V$).
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Procurement: You requested 2 pieces. These are highly specific parts; search for “1N5262” to find this exact specification.
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Troubleshooting: If the voltage on your 51V 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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