1N4741A

Overview

The onsemi 1N4741A is a general-purpose Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 20V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1W at ambient temperatures up to 75°C, utilizing a DO-41 axial leaded package suitable for through-hole mounting. Key electrical characteristics include a test current of 12.5mA, a maximum dynamic impedance of 22Ω, and a maximum reverse leakage current of 5μA. It operates within a temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation in the 20V range with tight manufacturing tolerances.
• Constructed with silicon junction technology for reliable unidirectional operation.
• Engineered for high thermal stability with an extended operating temperature range.

Applications

• Voltage reference circuits requiring precise potential levels.
• Overvoltage protection stages in power supply inputs.
• Clamping applications in signal conditioning networks.

Procurement Notes

Verify the specific manufacturer marking and datasheet revision when sourcing from different distributors, as component specifications may vary slightly between original equipment manufacturers and secondary suppliers. Ensure the package type matches the required PCB footprint and that the thermal derating curves align with the intended operational environment to prevent overheating during continuous use.

Selection Notes

Select this component when a standard 20V regulation point is required in through-hole designs. Consider the 1W power rating and ensure adequate heat sinking or airflow if operating near maximum limits. Compare dynamic impedance values against circuit sensitivity requirements to maintain signal integrity under varying load conditions.

Part Context

This part belongs to the widely used 1N47xx series of Zener diodes, which are industry-standard components for basic voltage regulation tasks. The 1N4741A specifically denotes the 20V variant within this family, sharing common packaging and testing standards with other voltages in the series for easy substitution in legacy designs.

Replacement Considerations

Compatible substitutes include the Vishay 1N4741A and Taiwan Semiconductor 1N4741A, provided they meet the same 20V nominal voltage, 1W power rating, and DO-41 package constraints. Verify pinout compatibility and thermal performance before implementation.