1N4742A

Overview

The Good-Ark Semiconductor 1N4742A is a silicon unidirectional voltage regulator diode housed in a hermetically sealed DO-41 glass axial 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 at 25°C ambient temperature and features a junction temperature rating up to 200°C. Electrical characteristics include a maximum dynamic impedance of 9 Ω at the test current of 21 mA, a reverse leakage current of 5 µA at 9.1 V, and a forward voltage drop of 1.2 V at 200 mA.

Feature Summary

• Glass passivated junction for environmental stability
• Low zener impedance and low regulation factor
• High temperature soldering capability guaranteed

Applications

• Voltage stabilization circuits
• Voltage reference applications
• Overvoltage protection

Procurement Notes

Verify that the component matches the specific Good-Ark Semiconductor datasheet specifications rather than generic equivalents. Confirm the package type is the standard DO-41 glass axial lead configuration. Ensure the ordering suffix aligns with the manufacturer's current production standards. Check for RoHS compliance status if required by the design constraints.

Selection Notes

Select this component when a stable 12 V reference is needed within a through-hole design. The 1W power rating allows for moderate current handling in linear regulation scenarios. Consider the thermal resistance and ambient temperature derating curves for high-power environments. The DO-41 package offers reliable mounting flexibility for various PCB layouts.

Part Context

This part belongs to the 1N47xx series of general-purpose Zener diodes manufactured by Good-Ark Semiconductor. The series covers a wide voltage range from 3.3V to 100V, all sharing the same 1W power dissipation and DO-41 glass package form factor. This standardization simplifies inventory management for designs requiring multiple voltage levels.

Replacement Considerations

Cross-reference with other manufacturers' 1N4742A parts ensuring identical 12V nominal voltage, 1W power rating, and DO-41 package dimensions. Verify electrical parameters such as impedance and leakage current meet the original design requirements.