1N4476

Single Zener Diodes Overview

The Microchip Technology 1N4476 is a 30 V Zener voltage regulator diode housed in a DO-41 axial lead package. It features a maximum steady-state power dissipation of 1.5 W and operates within a junction temperature range of -65 °C to +175 °C. The device exhibits a nominal dynamic impedance of 20 Ohms at a test current of 8.5 mA, with a maximum reverse leakage current of 50 nA. Standard commercial versions provide a voltage tolerance of ±5%.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction utilizing internal metallurgical bonds for robust reliability.
• Triple-layer passivation provides protection against environmental stressors.
• Qualified per MIL-PRF-19500/406 for high-reliability military applications.
• Inherently radiation hard as described in Microsemi MicroNote 050.

Single Zener Diodes Applications

• Voltage regulation in high-reliability circuits where failure cannot be tolerated.
• Reference voltage sources for precision measurement systems.
• Overvoltage protection in aerospace and defense electronics.

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix to confirm the required qualification level (JAN, JANTX, JANTXV, or JANS) and tolerance grade. Commercial versions are available in RoHS-compliant configurations, while military grades typically utilize tin/lead terminations. Confirm package availability matches the design requirements, as surface mount equivalents exist under different part numbers.

Single Zener Diodes Selection Notes

Select the 1N4476 when a precise 30 V reference is needed with high thermal stability and ruggedness. Ensure the circuit design accommodates the 1.5 W power rating and derating curves provided in the datasheet. Consider the higher cost associated with military qualifications if standard commercial performance is insufficient for the application environment.

Single Zener Diodes Part Context

The 1N4476 belongs to the industry-standard JEDEC registered 1N4460–1N4496 series of 1.5 W glass Zener diodes. This family offers a wide selection of voltages from 3.3 V to 200 V. The series is recognized for its void-less hermetic sealing and is widely used in critical electronic systems requiring long-term stability and resistance to harsh conditions.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the 1N4476US series using SQ-MELF packages. For direct pin-compatible replacements, verify that substitute parts meet the same MIL-PRF-19500/406 qualification levels and electrical characteristics.