1N4915A

Overview

The Microchip Technology 1N4915A is a silicon planar Zener diode designed for voltage regulation and reference applications. It utilizes the DO-35 axial glass encapsulation, providing robust performance in through-hole mounting configurations. The device operates within an extended temperature range from -65°C to +175°C, ensuring reliability in demanding environments. Key electrical characteristics include a nominal Zener voltage of 12.8V with a tolerance of 5%, a maximum power dissipation of 0.5W, and a test current of 5mA. Additional parameters specify a maximum reverse leakage current of 15µA and a Zener impedance of 90 Ohms at the test current.

Feature Summary

• Utilizes silicon planar technology for stable voltage regulation and reliable operation across wide temperature ranges.
• Features low noise characteristics suitable for precision analog circuits and sensitive signal processing applications.
• Encapsulated in a hermetically sealed DO-35 glass package to protect against environmental factors and ensure long-term durability.

Applications

• Precision voltage reference circuits requiring stable DC levels.
• Overvoltage protection stages in electronic systems.
• Temperature compensated regulator designs.

Procurement Notes

Verify the specific manufacturer source, as the 1N4915A designation has been produced by multiple entities including Microsemi and Microchip. Confirm that the procurement channel provides original manufacturer documentation or traceability records. Ensure the received component matches the DO-35 package style and specified electrical tolerances. Request batch-specific data sheets to validate compliance with the stated voltage and leakage parameters before integration into critical designs.

Selection Notes

Select this component when a 12.8V regulation point is required with strict 5% tolerance limits. The DO-35 package is appropriate for standard through-hole PCB layouts where space constraints are minimal. Consider the 0.5W power rating and thermal derating requirements for high-temperature environments up to 175°C. Evaluate the 90 Ohm impedance for dynamic load regulation needs in the target circuit topology.

Part Context

The 1N4915A belongs to the family of standard Zener diodes used for fundamental voltage control tasks. While similar to other 1N4xxx series components, it specifically targets the 12.8V breakdown region. Microchip Technology continues to support legacy semiconductor lines alongside modern integrated solutions, maintaining supply for established discrete components used in industrial and aerospace equipment.

Replacement Considerations

The 1N4915-1 is a confirmed equivalent part number offering identical 12.8V specifications and DO-35 packaging. Verify pinout compatibility and physical dimensions when substituting between manufacturers to ensure seamless mechanical integration without redesigning the footprint.