CD5539B

Single Zener Diodes Overview

The CD5539B is a unidirectional silicon Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 19 V with a tolerance of ±10%. The device supports a maximum DC power dissipation of 500 mW and operates within a junction temperature range of -65°C to +175°C. Electrical characteristics include a maximum reverse leakage current of 10 nA at 16 V, a maximum Zener impedance of 100 Ohms, and a forward voltage of 1.1 V maximum at 200 mA.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction.
• Capable of handling 500 mW power dissipation when proper heat sinking is applied.
• Features complete junction protection via silicon dioxide passivation.

Single Zener Diodes Applications

• Voltage reference circuits in military-grade systems
• Over-voltage protection for sensitive semiconductor components
• Clamping applications in high-reliability aerospace electronics

Single Zener Diodes Procurement Notes

Verify the specific manufacturer source, as the CD5539B part number appears in documentation from both Microsemi (now Microchip) and CDI-DIODE. Confirm that the component meets MIL-PRF-19500/437 requirements if specified for your application. Ensure the package type matches your design constraints, as variations exist between die form and packaged versions.

Single Zener Diodes Selection Notes

Select this component for designs requiring a 19 V regulation point with high thermal stability. The wide operating temperature range makes it suitable for harsh environments. Verify compatibility with wire bonding or die attach techniques, noting that solder reflow may not be compatible depending on the specific manufacturing variant.

Single Zener Diodes Part Context

The CD5539B belongs to the CD5518B through CD5546B series of Zener diode chips. These devices are electrically equivalent to the 1N5518B through 1N5546B series but are offered in chip form. They are designed for integration into hybrid microcircuits or custom packaging solutions requiring robust voltage regulation capabilities.

Single Zener Diodes Replacement Considerations

The CD5539B is electrically equivalent to the 1N5539B series. For packaged replacements, consider the JANHC or JANKC variants per MIL-PRF-19500/437. Verify that substitute parts maintain the required 500 mW power rating and temperature specifications.