1N4738A-T50R

Overview

The onsemi 1N4738A-T50R is a silicon Zener diode designed for voltage regulation and reference applications. It features an 8.2V nominal Zener voltage with a standard tolerance of ±5%. The device is rated for a maximum power dissipation of 1W at 25°C ambient temperature, utilizing a DO-41 axial leaded package. Key electrical characteristics include a maximum reverse leakage current of 10µA and a Zener impedance of 4.5Ω at the test current of 31mA. It operates within a junction temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation through avalanche breakdown in the reverse bias region.
• Features a glass passivated junction for enhanced reliability and environmental protection.
• Capable of handling high surge currents for transient protection scenarios.

Applications

• Voltage reference circuits requiring precise DC levels.
• Overvoltage protection stages in power supply inputs.
• Clamping applications in signal processing paths.

Procurement Notes

Verify the specific suffix T50R against official onsemi documentation to confirm reel packaging specifications and tape-and-reel dimensions. Ensure the component meets RoHS compliance requirements if mandated by the target assembly process. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before procurement.

Selection Notes

Select this component when a robust 8.2V regulation point is required in through-hole designs. The DO-41 package offers mechanical stability for manual or automated insertion. Consider the thermal derating curve if operating above 25°C ambient conditions. Compare the 4.5Ω dynamic impedance against circuit sensitivity requirements to ensure adequate noise performance.

Part Context

This part belongs to the widely used 1N47 series of axial Zener diodes. The series covers a broad voltage range from 3.3V to 100V, sharing common mechanical and thermal characteristics. The 1N4738A variant specifically targets the 8.2V segment, offering a balance between low leakage and moderate regulation precision suitable for general-purpose electronics.

Replacement Considerations

Compatible substitutes include the Vishay 1N4738A and Nexperia 1N4738A. These alternatives maintain identical pinouts, voltage ratings, and package dimensions. Verify that replacement sources guarantee equivalent Zener impedance and leakage current limits to preserve circuit functionality.