1N5294UR-1/TR

Overview

The Microchip Technology 1N5294UR-1 is a surface-mount current regulator diode housed in a DO-213AB (MELF) package. It provides a nominal regulating current of 0.75 mA with a standard tolerance of ±10%, ranging from 0.675 mA to 0.825 mA at a test voltage of 25 V. The device features a minimum regulator impedance of 0.825 MΩ and a maximum knee impedance of 0.335 MΩ. It supports a peak operating voltage of 100 V and operates within a junction temperature range of -65 °C to +150 °C, dissipating up to 500 mW.

Feature Summary

• JEDEC registered surface mount equivalent of the 1N5294 series
• Hermetically sealed glass case with internal metallurgical bond
• High source impedance for stable current regulation
• Inherently radiation hard construction

Applications

• Constant current sources for LED biasing
• Current limiting protection circuits
• Biasing elements for transistor amplifiers
• Voltage-to-current conversion stages

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm material composition and qualification level. Ensure the procurement channel sources directly from authorized distributors or the manufacturer to guarantee authenticity. Confirm that the received components match the specified DO-213AB package dimensions and marking codes before integration into production lines.

Selection Notes

Select this component when a precise constant current is required over a wide voltage range. The 0.75 mA nominal value suits low-power biasing applications. Consider the ±10% tolerance for circuit design margins. Verify that the 100 V peak operating voltage exceeds the maximum expected reverse voltage in the application environment to prevent breakdown.

Part Context

This part belongs to the 1N5283UR-1 through 1N5314UR-1 series of 0.5 W current regulators. These devices serve as counterparts to Zener diodes by regulating current rather than voltage. The series offers a broad selection of currents from 0.22 mA to 10.0 mA, providing designers with flexible options for various current regulation needs in compact surface-mount designs.

Replacement Considerations

Direct replacements include other parts from the 1N5283UR-1 to 1N5314UR-1 series if current values align. Equivalent axial-leaded versions are available as 1N5283-1 through 1N5314-1. Cross-reference with the 1N7048UR-1 series for higher current requirements. Verify package compatibility and thermal characteristics when substituting.