1N5242B

Single Zener Diodes Overview

The onsemi 1N5242B is a single Zener diode housed in an axial lead DO-204AH (DO-35) package. It provides a nominal Zener voltage of 12 V with a tolerance of ±5%. The device dissipates up to 500 mW and operates within a junction temperature range of −65 °C to +200 °C. Electrical characteristics include a maximum dynamic impedance of 30 Ω at a test current of 20 mA, a reverse leakage current of 1 µA at 9.1 V, and a voltage temperature coefficient of 0.077 %/°C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation through the Zener breakdown effect for circuit protection and reference applications.
• Features a hermetically sealed glass axial lead package designed for high thermal stability and reliable operation under extreme temperatures.
• Offers precise voltage tolerance and low dynamic impedance to maintain consistent performance across varying load conditions.

Single Zener Diodes Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in measurement systems

Single Zener Diodes Procurement Notes

Verify that the ordered component matches the specific onsemi part number 1N5242B to ensure compliance with the documented electrical limits and package dimensions. Confirm the presence of the required top marking sequence for authenticity. Ensure handling procedures account for the specified thermal derating requirements above 50°C to prevent device damage during operation.

Single Zener Diodes Selection Notes

Select this component when a 12 V reference or regulation point is required in through-hole designs. The wide operating temperature range supports use in harsh environments where standard silicon devices may fail. Verify that the 500 mW power dissipation rating aligns with the expected thermal load and ambient conditions of the target application.

Single Zener Diodes Part Context

This device belongs to the 1N5221B through 1N5252B series of general-purpose Zener diodes manufactured by onsemi. The series utilizes a standardized axial lead glass package to provide a cost-effective solution for voltage clamping and regulation tasks across various industrial and commercial electronics applications.

Single Zener Diodes Replacement Considerations

• 1N5242B-TAP
• 1N5242B-TR

Single Zener Diodes FAQ

What is the maximum allowable junction temperature for the 1N5242B?

The maximum operating junction temperature is +200 °C.

How is the Zener voltage measured according to the datasheet?

The Zener voltage is measured with the device junction in thermal equilibrium at a lead temperature of 30 °C ±1°C and a 3/8″ lead length.