1N4742A

Overview

The SMC Diode Solutions 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 supports a maximum power dissipation of 1 W and operates within a temperature range of -65°C to +200°C. Key electrical parameters include a maximum Zener impedance of 9 Ohms, a reverse leakage current of 5 µA at 9.1 V, and a forward voltage of 1.2 V at 200 mA. It is available in the DO-41 axial through-hole package.

Feature Summary

• Provides stable voltage regulation using a single unidirectional Zener junction.
• Features very sharp reverse characteristic for precise breakdown control.
• Ensures high stability with low reverse current levels.
• Constructed with silicon material for robust performance.

Applications

• Voltage stabilization circuits
• Absolute reference voltage generation

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4742A part number is utilized by multiple semiconductor producers including onsemi, Microchip, Vishay, and Taiwan Semiconductor. Confirm that the selected component matches the required package type (DO-41) and compliance standards such as RoHS3 before procurement.

Selection Notes

Select this component for general-purpose voltage regulation where a 12 V reference is required. Ensure the circuit design accommodates the 1 W power dissipation limit and the specified operating temperature range. Verify compatibility with the DO-41 through-hole mounting style if replacing legacy designs.

Part Context

This component belongs to the standard 1N47xx series of silicon Zener diodes. The series offers an extensive selection of breakdown voltages ranging from 3.3 V to 30 V. These devices are widely used in electronic circuits requiring reliable voltage clamping or reference points.

Replacement Considerations

Cross-reference with other manufacturers' 1N4742A parts, such as those from onsemi or Vishay, ensuring identical electrical specifications and package dimensions are maintained.