1N5312UR-1/TR

Overview

The Microchip Technology 1N5312UR-1 is a current regulator diode housed in the DO-213AB (MELF) surface-mount package. It provides a nominal regulating current of 3.90 mA with standard 10% tolerance limits ranging from 3.51 mA to 4.29 mA at a 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.

Feature Summary

• Double-plug internal bond construction for enhanced reliability
• High source impedance for stable current regulation
• Inherently radiation hard design
• ESD nonsensitive operation

Applications

• Constant current sources for LED biasing
• Current limiting protection circuits
• Voltage reference stabilization

Procurement Notes

Verify that the specific ordering suffix matches the required tape-and-reel packaging configuration. Confirm compliance requirements against the commercial grade specifications, as military qualifications are available under different part numbers. Ensure the procurement documentation references the correct datasheet revision DS00005745A.

Selection Notes

Select this component when a fixed current sink or source is required over a wide voltage range. Verify that the 3.90 mA nominal current aligns with the load requirements. Check that the 100 V peak operating voltage exceeds the maximum circuit voltage. Consider the thermal resistance characteristics if high ambient temperatures are expected.

Part Context

This device belongs to the 1N5283UR-1 through 1N5314UR-1 series of 0.5 W current regulators. It serves as the JEDEC registered surface-mount equivalent to the axial-leaded 1N5283 through 1N5314 series. The family offers a selection of currents from 0.22 mA to 10.0 mA in standard 10% tolerances.

Replacement Considerations

The axial-leaded 1N5312 is the direct functional equivalent. For surface-mount replacements, verify the DO-213AB footprint compatibility. Other series members like 1N5311 or 1N5313 offer different current ratings but share the same package and electrical architecture.