Description
The 8.2V 0.5W Zener diode is a standard component used for voltage regulation and transient suppression. It is widely valued because 8.2V is the voltage where the temperature coefficient of the Zener effect and the forward-bias temperature coefficient of the PN junction begin to cancel each other out, resulting in excellent thermal stability. The industry-standard part number for this specification is the 1N5238.
Technical Specifications
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 8.2V, the diode begins to conduct, effectively “clamping” the potential at 8.2V 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 (). This is critical: without this resistor, the diode would draw unregulated current, exceed its 500mW power limit, and likely fail, typically as a short circuit.
Application & Safety Guidelines
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Thermal Management: To keep this 500mW device safe, ensure the current () flowing through it does not exceed the limit. Using the formula , your maximum current should be kept below ~61mA ().
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Procurement: You requested 2 pieces. These are standard parts; search for “1N5238” to find this exact specification.
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Troubleshooting: If the voltage on your 8.2V 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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