1N4454UR-1/TR

Overview

The Microchip Technology 1N4454UR-1 is a hermetically sealed switching diode housed in a DO-213AA glass package. It features copper-clad steel leads with a tin/lead finish and double plug construction. The device operates between -55°C and +175°C, supporting a maximum DC reverse voltage of 50V and a total power dissipation of 500mW. Key electrical characteristics include a maximum reverse recovery time (TRR) of 4.0ns at 25°C, a forward voltage drop of 1.0V max at 10mA, and a capacitance of 2.0pF max at 0V.

Feature Summary

• Hermetically sealed metallurgically bonded construction for reliability
• Double plug design within a glass package outline
• High thermal stability with extended operating temperature range

Applications

• High-reliability aerospace and defense circuits requiring MIL-PRF-19500/144 compliance
• Fast switching applications utilizing low reverse recovery time characteristics
• Circuit protection designs demanding hermetic sealing against environmental factors

Procurement Notes

Verify the specific quality level (JAN, JANTX, or JANTXV) required for your application, as these designations affect qualification standards but not necessarily the base part number structure. Confirm lead material specifications, as copper-clad steel differs from standard pure copper leads found in commercial variants. Ensure compatibility with high-temperature soldering processes given the 175°C operating limit and hermetic seal integrity requirements during assembly.

Selection Notes

Select this component when hermetic sealing and radiation hardness are critical, distinguishing it from standard plastic-packaged equivalents like LL4454. Consider the copper-clad steel leads if weight reduction is necessary, though this may impact solderability compared to pure copper. Evaluate the 50V reverse voltage rating against peak circuit voltages to ensure adequate margin. The fast recovery time makes it suitable for high-frequency switching where standard rectifiers would fail.

Part Context

This part belongs to the 1N4454 family of switching diodes, specifically the UR variant indicating the unique package and lead configuration. It shares functional similarities with LL4454 and CDLL4454 but differs in physical construction and sealing methods. The UR designation typically denotes a specific hermetic glass package style used in military and space-grade electronics rather than general consumer electronics.

Replacement Considerations

Direct substitutes include LL4454, CDLL4454, and MLL4454, though these may differ in packaging type and hermeticity. Verify that any replacement meets the specific MIL-PRF-19500/144 quality level if radiation tolerance or vacuum sealing is required. Non-hermetic alternatives will not provide the same environmental protection.