1N938B

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A 1N938B is a type of Zener diode, which is an electronic component used to regulate voltage in applications such as power supplies. Characterized as a single diode, 1N938B is usually used as a replacement part.

What Is a Zener Diode

A Zener diode is a semiconductor device with a reverse biased PN junction, meaning the anode and cathode are connected in opposite directions. Therefore, the current is allowed to flow through the diode in reverse, but only up to a certain level of voltage, known as the breakdown or “Zener” voltage. Above this voltage level, the diode allows a large amount of current to flow. This is done as a means of regulating the voltage, as it prevents it from rising too high.

1N938B Applications

The 1N938B is a type of Zener diode and is used primarily as a voltage regulator, as it prevents voltage fluctuations. It is often used in power supplies and in linear or switching regulators. It is also used in other types of power applications and for voltage sensitivity. Additionally, 1N938B, due to its reverse biased PN junction and its ability to handle higher currents without overheating, is particularly well-suited for surge suppression.

1N938B Characteristics

The 1N938B Zener diode is characterized by a reverse breakdown voltage of 6.2V with a cathode mounted. Its typical power dissipation rating is 500 mW (at 6.2V). Its temperature coefficient is 5 mV/°C (at 6.2V). The maximum power dissipation is 1500 mW. Its peak reverse current rating is 500 uA and its maximum resistance is 9 Ohms. The device’s maximum reverse voltage is calculated at 6.9V.

1N938B Working Principle

1N938B works off reverse breakdown voltage. When a voltage higher than its breakdown voltage is applied to the diode, it begins to conduct in the reverse direction. This creates a “Zener effect” and will regulate the voltage, preventing it from rising too high. For example, if the breakdown voltage of the diode is 6.2V, the voltage will not rise above 6.2V.

When the voltage attempts to exceed its rated peak voltage, the diode will kick in and act as a shorts circuit. This helps to protect the circuit where the diode is installed and keeps it from overheating due to excessive voltage.

In addition to its voltage regulation characteristics, the 1N938B is also able to take in high current without overheating. This makes it well suited for surge suppression, where it is exposed to high currents. The diode will not overheat due to the high current level.

Conclusion

The 1N938B is a type of Zener diode, a single diode characterized by a reverse biased PN junction that allows the current to flow through the diode in reverse only up to a certain voltage level. 1N938B is often used for voltage regulation and for surge suppression in power supplies and other power applications due to its ability to withstand high currents. Its breakdown voltage is 6.2V and its maximum reverse voltage is 6.9V. The typical power dissipation rating of 1N938B is 500 mW and its peak reverse current rating is 500 uA.

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