1N4742A

Overview

The Microchip Technology 1N4742A is a silicon unidirectional voltage regulator diode housed in the DO-41 axial lead package. It provides a nominal Zener voltage of 12 V with a tolerance of 5%. The device supports a maximum power dissipation of 1 W and operates within a temperature range of -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 1 uA, a Zener impedance of 9 Ohms, and a test current of 21 mA.

Feature Summary

• Hermetically sealed glass body construction for environmental protection
• Capable of regulating voltage over a broad operating current and temperature range
• Flexible axial-lead mounting terminals for through-hole integration

Applications

• Voltage stabilization circuits
• Reference voltage generation
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer source, as the 1N4742A designation is historically associated with multiple producers. Confirm RoHS compliance status, as original specifications may differ from modern equivalents. Ensure the DO-41 package dimensions match the target PCB layout requirements before finalizing procurement decisions.

Selection Notes

Select this component when a standard 12 V regulation point is required in high-power applications up to 1 W. The wide operating temperature range makes it suitable for industrial environments. Verify that the 9 Ohm impedance meets the dynamic regulation needs of the specific circuit design.

Part Context

This part belongs to the 1N47xx series of 1 Watt Zener diodes. It shares the same DO-41 package and thermal characteristics as other variants in the family, differing primarily in breakdown voltage. The series offers extensive voltage selection ranging from 3.3 V to higher values.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.