HZ9A1-90

Single Zener Diodes Overview

The HZ9A1-90 is a silicon Zener diode manufactured by Renesas Electronics, formerly Hitachi. It features a unidirectional configuration housed in the DO-35 glass axial leaded package. The device is rated for a maximum power dissipation of 0.4 W and supports an operating temperature up to 175 °C. Key electrical characteristics include a maximum reverse leakage current of 1 µA. The component utilizes a single junction structure with isolated case connection and is classified under EAR99 export control codes.

Single Zener Diodes Feature Summary

• Unidirectional Zener protection utilizing silicon technology
• High thermal stability supporting operation up to 175 °C
• Low noise performance suitable for sensitive circuits
• Glass encapsulation providing isolated case connection

Single Zener Diodes Applications

• Voltage reference stabilization in analog circuits
• Overvoltage protection for low-power signal lines
• Clamping applications in consumer electronics

Single Zener Diodes Procurement Notes

Verify the manufacturer origin carefully, as this component is historically associated with Hitachi before its integration into Renesas Electronics. Confirm the specific voltage rating required for your design, as the provided documentation lists the series but does not explicitly state the nominal Zener voltage value. Ensure the DO-35 package dimensions align with your PCB footprint requirements.

Single Zener Diodes Selection Notes

Select this component when a robust, high-temperature capable Zener diode is needed for low-power applications. The 0.4 W power rating and 175 °C limit make it suitable for environments where standard silicon diodes might fail. Consider the DO-35 package constraints if space is limited, as it requires through-hole mounting compared to surface-mount alternatives.

Single Zener Diodes Part Context

This part belongs to the discrete semiconductor diode category within the Renesas portfolio. It represents legacy Hitachi semiconductor technology now managed by Renesas Electronics. The DO-35 package is a standard industry form factor for small-signal diodes, ensuring compatibility with existing manufacturing processes designed for axial leaded components.

Single Zener Diodes Replacement Considerations

Consult official Renesas or distributor databases for direct cross-reference part numbers. Verify that any substitute maintains the same 0.4 W power dissipation, 175 °C temperature rating, and DO-35 package type to ensure mechanical and thermal compatibility.