1N5543A

Single Zener Diodes Overview

The Microchip Technology 1N5543A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 25 V with a standard tolerance of ±5%. The device operates in the DO-204AH (DO-35) axial leaded glass package, supporting through-hole mounting. It dissipates up to 500 mW at ambient temperatures and maintains functionality across an extended junction temperature range from -65 °C to +175 °C. Key electrical characteristics include a maximum reverse leakage current of 10 nA and a dynamic impedance of 100 Ohms at a test current of 1 mA.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation using avalanche breakdown principles in a compact axial glass package.
• Engineered for high-temperature reliability with an operational junction limit reaching 175 °C.
• Offers tight voltage tolerance for precision reference circuits requiring consistent performance.

Single Zener Diodes Applications

• Voltage reference sources in analog signal processing circuits
• Overvoltage protection stages for sensitive semiconductor inputs
• Biasing networks in transistor amplifier configurations

Single Zener Diodes Procurement Notes

Verify the specific suffix designation during procurement, as the 'A' suffix typically denotes a tighter voltage tolerance compared to the standard 'B' variant. Confirm package authenticity and lead integrity upon receipt. Ensure storage conditions prevent moisture absorption prior to soldering. Cross-reference datasheet revisions to confirm compliance with current environmental standards before final integration into production designs.

Single Zener Diodes Selection Notes

Select this component when a precise 25 V regulation point is required within a standard axial footprint. Consider the 5% tolerance if higher precision is unnecessary. Evaluate thermal management requirements given the 500 mW dissipation limit. Compare against military-grade variants like JANTXV if radiation hardness or extreme environmental sealing is mandated for the target application environment.

Single Zener Diodes Part Context

This part belongs to the 1N55xx series of low-voltage avalanche Zener diodes manufactured by Microchip Technology. The series covers a wide voltage range from 3.3 V to 33 V in the same DO-35 package form factor. These devices are widely used in general-purpose electronics where cost-effective, reliable voltage clamping is needed without the complexity of integrated regulators.

Single Zener Diodes Replacement Considerations

Direct functional substitutes include the 1N5543B for standard tolerance applications. Military-specification equivalents such as JANTXV1N5543B offer hermetic sealing. Generic replacements must match the 25 V Zener voltage, 500 mW power rating, and DO-35 package dimensions to ensure mechanical compatibility.