1N5305UR-1/TR

Overview

The Microchip Technology 1N5305UR-1/TR is a surface-mount current regulator diode housed in the DO-213AB (MELF, LL41) package. It provides a nominal regulating current of 2.0 mA with standard tolerances ranging from 1.80 mA to 2.20 mA. The device operates within a working peak voltage of 100 V and dissipates up to 500 mW of power. Electrical characteristics include a minimum regulator impedance of 0.395 MΩ at 25 V and a maximum limiting voltage of 1.85 V. The component supports an operating temperature range from -65 °C to +150 °C.

Feature Summary

• JEDEC registered surface mount equivalent of the 1N5283 through 1N5314 series
• Double-plug internal bond connection for unique current regulation functions
• High source impedance and inherent radiation hardness
• Hermetically sealed glass case construction

Applications

• Current regulation over broad operating voltage ranges
• Temperature-compensated Zener reference circuits
• Biasing elements for transistor amplifier stages

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging configuration. The TR suffix indicates tape and reel packaging, which differs from bulk options. Confirm RoHS compliance status as it varies by grade. Ensure the procurement channel sources directly from authorized distributors to guarantee authenticity and traceability for this military-grade qualified component.

Selection Notes

Select the 1N5305UR-1/TR when a precise 2.0 mA constant current is required in a compact surface-mount form factor. Evaluate the 100 V peak operating voltage limit to ensure compatibility with circuit requirements. Consider the thermal resistance and derating curves if operation exceeds 125 °C. Verify that the DO-213AB package dimensions align with the available PCB footprint constraints.

Part Context

This component belongs to the 1N5283UR-1 through 1N5314UR-1 family of 0.5 watt current regulators manufactured by Microchip Technology. These devices serve as counterparts to Zener diodes by regulating current rather than voltage. The UR-1 designation specifically denotes the leadless MELF surface-mount package variant designed for automated assembly processes.

Replacement Considerations

Direct replacements include other members of the 1N5283UR-1 to 1N5314UR-1 series or the 1N7048UR-1 to 1N7055UR-1 series. Substitutes must match the 2.0 mA nominal current and DO-213AB package. Axial-leaded equivalents such as the 1N5305-1 are available but require different mounting considerations.