1N5291

Overview

The Microchip Technology 1N5291 is a current regulator diode designed for through-hole mounting in the DO-7 (DO-204AA) axial-leaded package. It provides a regulated current of 616 µA with a maximum reverse voltage rating of 100 V and a power dissipation capacity of 500 mW. This device belongs to the 1N5283-1 through 1N5314-1 series, which offers standard 10% tolerance options ranging from 0.22 mA to 4.7 mA. The component functions as a constant current source over a broad voltage range, serving as a counterpart to Zener diodes that regulate voltage.

Feature Summary

• Provides stable current regulation across a wide operating voltage range
• Utilizes double-plug internal bond connection within the DO-7 package for enhanced reliability
• Features a larger active die element optimized for unique current limiting applications

Applications

• Constant current sources for LED biasing circuits
• Current limiting protection in electronic systems
• Replacement or counterpart to Zener diodes in specific circuit topologies

Procurement Notes

Verify the specific ordering suffix to confirm the exact package type and qualification level, as the base part number may correspond to commercial or military grades. Confirm the manufacturer's current production status and lead times directly with authorized distributors, as availability varies by region and stock levels. Ensure the selected variant matches the required through-hole mounting style and DO-7 package dimensions for proper PCB integration.

Selection Notes

Select this component when a fixed current sink is required rather than voltage regulation. Verify that the circuit's supply voltage exceeds the minimum dropout voltage while remaining below the 100 V maximum limit. Consider the 500 mW power dissipation rating to ensure thermal management is adequate for the expected operating conditions and ambient temperature range.

Part Context

The 1N5291 is part of the broader 1N5283-1 to 1N5314-1 family of 0.5-watt current regulators manufactured by Microchip Technology. This series is available in various qualification levels including JAN, JANTX, JANTXV, and JANS, adhering to MIL-PRF-19500/463 standards for specific variants. The family provides a comprehensive selection of current values to suit diverse analog and digital circuit requirements.

Replacement Considerations

Direct substitutes include other 1N52xx series current regulator diodes with identical 616 µA ratings and 100 V breakdown voltages. Verify pinout compatibility and package dimensions when replacing with equivalent parts from other manufacturers to ensure mechanical fit and electrical performance match.