1N5242BDO35E3

Single Zener Diodes Overview

The Microsemi Corporation 1N5242BDO35E3 is a single Zener diode housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 12 V with a standard tolerance of ±5%, indicated by the 'B' suffix. The device operates at a test current of 20 mA and dissipates up to 0.5 watts at 25°C. Key electrical parameters include a maximum reverse leakage current of 10 µA at 9 V, a dynamic impedance of 1.0 Ω at 0.25 mA, and a positive temperature coefficient of +0.077 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Regulates voltage across a broad operating current and temperature range
• Inherently radiation hard per MicroNote 050
• Minimal capacitance characteristics suitable for high-frequency applications

Single Zener Diodes Applications

• Voltage regulation in electronic circuits
• Voltage reference sources
• Overvoltage protection

Single Zener Diodes Procurement Notes

Verify that the part number includes the 'e3' suffix to confirm RoHS compliance. Ensure the 'B' suffix is present to guarantee the required ±5% voltage tolerance. Confirm the package type matches the DO-35 specification. Check for any specific military screening prefixes if higher reliability standards are required for the application environment.

Single Zener Diodes Selection Notes

Select this component when a precise 12 V reference with tight tolerance is needed in an axial-lead form factor. The low dynamic impedance supports stable regulation under varying load conditions. Consider the thermal resistance and derating curves for power dissipation limits in enclosed spaces or elevated ambient temperatures.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. The series offers a wide selection of voltages from 2.4 V to 200 V. Standard tolerances are available with A (±10%) or B (±5%) suffixes, while tighter tolerances use C (±2%) or D (±1%) suffixes. The 'e3' designation indicates lead finish compliance with environmental directives.

Single Zener Diodes Replacement Considerations

JEDEC registered equivalents such as 1N5242B are functionally compatible. Surface mount alternatives like MLL5242B provide similar electrical performance in a MELF package. Verify pinout orientation and thermal management requirements when transitioning between package styles.

Single Zener Diodes FAQ

What is the temperature coefficient for the 1N5242B?

The temperature coefficient is +0.077 %/°C.

How is polarity identified on the DO-35 package?

Polarity is indicated by a band on the cathode end of the glass body.