1N5291-1/TR

Overview

The Microchip Technology 1N5291-1/TR is a silicon current regulator diode designed for constant current applications. It features a nominal regulating current of 0.56 mA and a maximum limiting voltage of 1.1 V. The device supports a maximum repetitive peak reverse voltage of 100 V and handles a maximum power dissipation of 0.5 W. It exhibits a minimum dynamic impedance of 1,900,000 Ω. Packaged in the DO-7 axial leaded format, this component operates within standard commercial temperature ranges and serves as a counterpart to Zener diodes by regulating current over a broad voltage range.

Feature Summary

• Provides stable current regulation across a wide voltage span
• Utilizes double-plug internal bond connection for enhanced reliability
• Functions as a current limiter with larger active die element

Applications

• Constant current sources for LED driving
• Biasing circuits for transistors and integrated circuits
• Current limiting protection in series with sensitive loads

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm tape-and-reel packaging versus bulk availability. Confirm RoHS compliance status as commercial versions may differ from qualified levels. Ensure the ordering quantity matches the manufacturer's specified reel size requirements for surface mount or through-hole variants.

Selection Notes

Select this component when a fixed current value near 0.56 mA is required without complex feedback loops. Compare against the broader 1N5283-1 through 1N5314-1 series if alternative current ratings between 0.22 mA and 4.7 mA are needed. Verify that the 100 V reverse voltage rating exceeds the maximum potential reverse bias in the circuit design.

Part Context

This part belongs to the popular 1N5283-1 through 1N5314-1 series of 0.5 watt current regulators manufactured by Microsemi/Microchip. The series offers a selection of currents in standard 10% tolerances. While the base 1N5291 is available in various packages, the -1 variant specifically denotes the axial DO-7 package configuration with distinct internal bonding.

Replacement Considerations

Direct substitutes include other parts from the 1N5283-1 through 1N5314-1 series with identical 0.56 mA specifications. Cross-reference with JAN1N5291UR-1 for SMT equivalents if board space constraints require a change from axial to surface mount packaging.