1N5311UR-1/TR

Overview

The Microchip Technology 1N5311UR-1/TR is a surface-mount current regulator diode housed in the DO-213AB (MELF) package. It provides a nominal regulating current of 3.60 mA with a standard tolerance range of 3.24 mA to 3.96 mA at a test voltage of 25 V. The device supports a maximum working peak voltage of 100 V and handles up to 500 mW of steady-state power dissipation at an ambient temperature of +125 °C. It operates within a junction temperature range of –65 °C to +150 °C, featuring high source impedance and inherent radiation hardness.

Feature Summary

• JEDEC registered surface mount equivalent of the 1N5283 through 1N5314 series
• Double-plug internal bond construction for robust performance
• High source impedance for stable current regulation
• Inherently radiation hard design

Applications

• Current limiting circuits requiring broad operating voltage ranges
• Temperature-compensated reference designs
• Biasing networks for semiconductor devices

Procurement Notes

Verify that the ordering suffix /TR indicates tape and reel packaging per EIA-481-1-A standards. Confirm the specific qualification level required, as JAN, JANTX, JANTXV, and JANS variants are available under MIL-PRF-19500/463. Ensure the procurement specification matches the commercial grade RoHS compliant status if lead-free terminals are necessary.

Selection Notes

Select this component when a constant current source is needed across a wide voltage span rather than a fixed voltage drop. The 1N5311UR-1 offers a 3.60 mA nominal current suitable for low-power biasing. Consider the thermal resistance of 100 °C/W and the need for COE matching on the mounting surface to ensure mechanical reliability during soldering and operation.

Part Context

This part belongs to the 1N5283UR-1 through 1N5314UR-1 family of 0.5 watt current regulators. It serves as the surface-mount counterpart to the axial-leaded 1N5283-1 through 1N5314-1 series. The DO-213AB package provides a hermetically sealed glass case with tin/lead or matte-tin terminal finishes depending on the specific grade.

Replacement Considerations

The axial-leaded 1N5311-1 is the direct functional equivalent. Other members of the 1N5283-1 to 1N5314-1 series may be used if the current tolerance aligns with the application requirements.