1N4740A

Overview

The onsemi 1N4740A is a general-purpose silicon Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 10 V with a tolerance of ±5% at a test current of 25 mA. The device is housed in the DO-41 axial leaded package, providing robust mechanical stability for through-hole mounting. It operates within a junction temperature range of -65°C to +175°C and offers a maximum DC forward current of 1 A. Key electrical characteristics include a maximum reverse leakage current of 5 µA at rated voltage and a maximum Zener impedance of 6 Ω.

Feature Summary

• Provides stable voltage regulation using avalanche breakdown principles
• Engineered for high thermal stability across extended temperature ranges
• Constructed with durable axial leaded packaging for reliable PCB integration

Applications

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

Procurement Notes

Verify the specific datasheet revision and manufacturer lot codes upon procurement. Confirm that the component matches the exact 1N4740A specification regarding voltage tolerance and package dimensions. Ensure storage conditions adhere to moisture sensitivity levels if applicable. Cross-reference ordering information directly with onsemi official documentation to avoid counterfeit or obsolete stock issues.

Selection Notes

Select this component when a fixed 10 V reference is required in low-power regulation scenarios. Consider the DO-41 package constraints for board space and thermal dissipation requirements. Evaluate the 25 mA test current condition against actual circuit operating points to ensure accuracy. Compare alternative packages if surface-mount solutions are necessary for automated assembly processes.

Part Context

This part belongs to the standard 1N47xx series of Zener diodes widely used in electronic design. The 1N4740A specifically denotes the 10 V variant within this family. These components serve as fundamental building blocks for linear regulators and protection circuits. The series is characterized by consistent manufacturing standards ensuring interchangeability across different production batches.