1N5309E3

Overview

The 1N5309E3 is a current regulator diode manufactured by Microchip Technology, designed for applications requiring stable current regulation. It features a maximum anode-to-cathode voltage of 100V and a regulated current of 3.3mA. The device supports a power dissipation of 500mW and operates within a junction temperature range of -65°C to +175°C. Packaged in the DO-204AA (DO-7) axial leaded format, it is suitable for through-hole mounting. This component provides a simple, two-terminal solution for constant current sources without the complexity of active circuitry.

Feature Summary

• Provides constant current regulation with a fixed output of 3.3mA
• Supports high operating temperatures up to 175°C junction temperature
• Features a robust 100V maximum voltage rating across terminals
• Utilizes a standard axial DO-7 package for easy through-hole integration

Applications

• Biasing circuits for LEDs and laser diodes
• Constant current sources for sensor interfaces
• Protection circuits limiting current to sensitive components
• Reference current generation in analog signal processing

Procurement Notes

Verify the specific suffix E3 confirms lead-free compliance when sourcing. Confirm the DO-7 axial package matches your PCB footprint requirements. Check manufacturer documentation for any recent PCNs regarding assembly site or labeling changes that may affect part identification. Ensure the 500mW power rating aligns with your thermal design constraints under expected operating conditions.

Selection Notes

Select this component when a simple, passive constant current source is required. The 3.3mA value is fixed; verify this matches your load requirements. Consider the 100V breakdown voltage as the maximum allowable voltage drop across the device. The wide temperature range makes it suitable for industrial environments where standard silicon devices might fail.

Part Context

This part belongs to the 1N53xx series of current regulator diodes from Microchip Technology. These devices are legacy equivalents often used in designs originally specified with generic JEDEC numbering. The series offers various current values ranging from microamps to milliamps, providing a standardized option for current limiting tasks across different electronic systems.

Replacement Considerations

Direct replacements include other 1N5309 variants from different manufacturers, provided they meet the 3.3mA current and 100V voltage specifications. Verify pinout compatibility for axial packages. Cross-reference with datasheets from competitors like Vishay or ON Semiconductor for equivalent performance metrics.