1N5312UR-1

Overview

The Microchip Technology 1N5312UR-1 is a current regulator diode housed in a DO-213AB (MELF) surface-mount package. It provides a nominal regulating current of 3.90 mA with a standard tolerance of ±10%, resulting in a maximum current of 4.29 mA at a voltage of 25 V. The device supports a peak operating voltage of 100 V and dissipates up to 500 mW of power. It operates within a junction temperature range of -65 °C to +150 °C, featuring high source impedance and an internal metallurgical bond for reliability.

Feature Summary

• JEDEC registered surface mount equivalent of the axial-leaded 1N5283 through 1N5314 series
• Double-plug construction providing a large die element for unique current regulation functions
• Inherently radiation hard as described in Microchip MicroNote 050
• Hermetically sealed glass case with leadless package design

Applications

• Current limiting circuits requiring broad voltage range operation
• Temperature-compensated Zener reference circuits
• Constant current sources for LED biasing or sensor excitation

Procurement Notes

Verify that the specific ordering suffix matches the required termination finish and packaging format. Commercial grade versions are available in RoHS-compliant configurations, while military qualifications such as JAN, JANTX, JANTXV, and JANS are offered per MIL-PRF-19500/463. Confirm tape and reel specifications against EIA-481-1-A standards if automated assembly is planned.

Selection Notes

Select this component when a surface-mount solution is needed to replace axial current regulators. Ensure the circuit voltage remains below the 100 V peak limit and power dissipation does not exceed 500 mW. Consider the thermal resistance of 100 °C/W and derating requirements above 125 °C during layout. Match the mounting surface coefficient of expansion to the device's approximately +6 PPM/°C value.

Part Context

This part belongs to the 1N5283UR-1 through 1N5314UR-1 family of 0.5 watt current regulators. The series offers a selection from 0.22 mA to 10.0 mA in standard 10% tolerances. These devices function as counterparts to Zener diodes by regulating current over a broad voltage range rather than voltage over a broad current range.

Replacement Considerations

Direct surface-mount equivalents include parts from the 1N5283UR-1 to 1N5314UR-1 series. For axial replacements, refer to the 1N5283-1 through 1N5314-1 series.