1N4742A

Overview

The onsemi 1N4742A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 12 V with a tolerance of ±5%. The device is housed in a DO-41 axial leaded package, suitable for through-hole mounting. It supports a maximum power dissipation of 1 W and operates within a temperature range of -65°C to +200°C. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 9 Ohms at a test current of 21 mA.

Feature Summary

• Provides stable voltage regulation using a single unidirectional Zener junction.
• Utilizes a glass-passivated silicon construction for durability.
• Designed for through-hole installation via an axial leaded package.

Applications

• Voltage stabilization circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer designation, as the 1N4742A part number is utilized by multiple semiconductor producers including onsemi, Taiwan Semiconductor, and PANJIT. Confirm that the component matches the required DO-41 package dimensions and electrical specifications before integration. Ensure compliance with relevant environmental standards such as RoHS and REACH requirements for the intended market.

Selection Notes

Select this component when a standard 12 V reference is required in a through-hole design. The 1 W power rating allows for moderate current handling in bulk packaging. Consider the 9 Ohm impedance for dynamic load variations. Verify thermal management capabilities given the high maximum operating temperature rating of the package.

Part Context

This component belongs to the widely recognized 1N47 series of general-purpose Zener diodes. The series offers a broad selection of breakdown voltages ranging from 3.3 V to higher values, all sharing similar physical form factors and performance profiles. The 1N4742A specifically addresses the 12 V segment of this extensive lineup.

Replacement Considerations

Cross-reference with equivalent parts from other manufacturers such as Taiwan Semiconductor or PANJIT. Ensure substitute components maintain identical voltage ratings, power dissipation limits, and package compatibility for direct replacement.