1N4481

Single Zener Diodes Overview

The Microchip Technology 1N4481 is a 1.5-watt Zener voltage regulator diode housed in a DO-41 axial leaded package. It provides a nominal Zener voltage of 47 V with a standard tolerance of ±5%. The device operates within a junction and storage temperature range of -65°C to +175°C. Key electrical characteristics include a maximum dynamic impedance of 50 Ohms at the test current of 5.5 mA, a maximum reverse leakage current of 0.5 µA, and a forward voltage of 1.5 V at 1.0 A.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability.
• Qualified per MIL-PRF-19500/406 for military applications including JAN, JANTX, JANTXV, and JANS levels.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Triple-layer passivation and robust tungsten slug design.

Single Zener Diodes Applications

• High-reliability voltage regulation where failure cannot be tolerated.
• Military and aerospace electronic systems requiring radiation hardness.
• Voltage reference circuits operating across broad temperature ranges.

Single Zener Diodes Procurement Notes

Verify the specific qualification level required for your application, as the base part number may correspond to commercial grade while suffixes indicate MIL-PRF-19500/406 compliance. Confirm terminal plating options, noting that RoHS compliant matte/tin terminals are available only on commercial grades. Ensure the ordering suffix matches the desired tolerance and environmental rating specifications.

Single Zener Diodes Selection Notes

Select this component when a 1.5-watt power dissipation rating and 47 V breakdown voltage are required. Consider the DO-41 package for through-hole mounting flexibility. Evaluate the thermal resistance and derating curves if operation near the maximum junction temperature limit is anticipated. Verify that the 5% standard tolerance meets circuit precision requirements or select tighter tolerance variants if necessary.

Single Zener Diodes Part Context

This device belongs to the 1N4460–1N4496 series of industry-recognized Zener voltage regulators. The series covers a wide voltage selection from 3.3 V to 200 V. While the base JEDEC designation identifies the voltage class, official documentation distinguishes between commercial versions and those qualified to strict military standards based on added alphanumeric suffixes.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 1.5 W power rating, 47 V nominal voltage, and DO-41 package dimensions. For military-grade equivalents, verify compatibility with MIL-PRF-19500/406 qualification levels such as JAN or JANTX. Commercial substitutes should be evaluated against the hermetic sealing and radiation hardness requirements of the original specification.

Single Zener Diodes FAQ

Is the 1N4481 inherently radiation hard?

Yes, the datasheet states that the device is inherently radiation hard as described in Microsemi MicroNote 050.

What is the maximum continuous regulator current for the 1N4481?

The maximum continuous regulator current (IZM) is 30 mA.

How is polarity indicated on the device?

Polarity is indicated by a band on the body of the diode, which marks the cathode end.