1N459A

Overview

The Microchip Technology 1N459A is a JEDEC registered small signal switching diode designed for general-purpose applications. It features a DO-204AH (DO-35) axial through-hole package with hermetically sealed metallurgical bonding and double plug construction. Key electrical specifications include a peak repetitive reverse voltage of 200 V, a maximum forward current of 150 mA, and a low leakage current of 25 nA at rated voltage. The device exhibits a maximum forward voltage drop of 1 V at 100 mA and supports a surge current of 4 A. It operates within a temperature range of -65°C to +175°C junction temperature.

Feature Summary

• Hermetically sealed construction with metallurgically bonded elements for reliability
• Double plug design ensuring stable performance under varying conditions
• Tightened forward voltage specification for consistent switching characteristics
• JEDEC registered compliance for standardized industry integration

Applications

• General purpose rectification in electronic circuits
• High conductance switching applications requiring low leakage
• Protection circuits utilizing surge current handling capabilities

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N459A part number is utilized by multiple vendors including onsemi and Fairchild. Confirm that the received component matches the Microchip Technology datasheet specifications, particularly regarding the DO-204AH package dimensions and hermetic seal integrity. Ensure the ordering suffix aligns with the required packaging format, such as bulk or tape and reel, to match assembly requirements.

Selection Notes

Select this component when a hermetically sealed, high-reliability silicon planar diode is required for harsh environments. The 1N459A is suitable for designs demanding strict leakage current limits and robust surge handling. Compare the 150 mA continuous forward current rating against circuit load requirements. Consider the axial leaded package for manual insertion or standard PCB mounting where surface mount alternatives are not feasible.

Part Context

The 1N459A belongs to the JEDEC registered 1N457A through 1N459A series of small signal diodes. This family is characterized by its ruggedized construction and suitability for critical applications. Microchip Technology produces this variant with specific attention to forward voltage tightness and hermetic sealing, distinguishing it from non-hermetic commercial equivalents while maintaining compatibility with standard axial footprint layouts.

Replacement Considerations

Direct substitutes include other manufacturers' 1N459A variants, such as those from onsemi or Fairchild, provided they meet the same JEDEC registration standards. Verify pinout compatibility and package dimensions (DO-204AH) before substitution. Ensure replacement parts maintain the 200 V reverse voltage and 150 mA forward current ratings to preserve circuit functionality.