1N5297UR-1

Overview

The Microchip Technology 1N5297UR-1 is a silicon current regulator diode housed in a hermetically sealed DO-213AB (MELF) surface-mount package. It provides a nominal regulating current of 1.0 mA with standard 10% tolerance, operating within a range of 0.900 mA to 1.100 mA at a voltage of 25 V. The device features a maximum limiting voltage of 1.35 V and supports a peak operating voltage of 100 V. Electrical characteristics include a minimum regulator impedance of 0.800 MΩ and a minimum knee impedance of 0.205 MΩ. It operates across a junction temperature range of -65 °C to +150 °C with a steady-state power dissipation rating of 500 mW.

Feature Summary

• Double-plug internal metallurgical bond construction for enhanced reliability
• High source impedance ensuring stable current regulation over broad voltage ranges
• Inherently radiation hard design suitable for harsh environments
• ESD nonsensitive operation without requiring external protection

Applications

• Constant current sources for LED biasing circuits
• Current limiting protection in sensitive electronic loads
• Reference current generation in analog signal processing systems

Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm qualification level and compliance status. Military-grade variants require distinct part number identification compared to commercial equivalents. Confirm RoHS compliance requirements prior to procurement, as availability varies by grade. Ensure the supplier provides traceable documentation matching the requested MIL-PRF-19500/463 standards if applicable.

Selection Notes

Select the 1N5297UR-1 when a precise 1.0 mA constant current is required in a compact surface-mount form factor. Evaluate the 100 V peak operating voltage against circuit transients to ensure adequate margin. Consider the thermal resistance of 100 °C/W and derating requirements above 125 °C for high-temperature environments. Compare against axial-leaded alternatives if PCB space constraints allow for larger packages.

Part Context

This component belongs to the 1N5283UR-1 through 1N5314UR-1 series of 0.5 watt current regulators. It serves as the JEDEC registered surface-mount equivalent to the traditional axial-leaded 1N5283 through 1N5314 devices. The series offers a wide selection of currents from 0.22 mA to 10.0 mA, providing designers with standardized options for various current regulation needs in both commercial and military applications.

Replacement Considerations

Publicly confirmed substitute part numbers include JAN1N5297UR-1 and JANTX1N5297UR-1.