1N4623

Overview

The Microchip Technology 1N4623 is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V with a tolerance of ±5%. The device has a maximum power dissipation of 500 mW and a maximum Zener impedance of 1600 Ohms. It is available in the DO-35 axial through-hole package. Reverse leakage current is specified at 4 µA when measured at 2 V. The component supports a junction temperature up to 175°C.

Feature Summary

• Provides stable voltage regulation using a 4.3 V Zener reference.
• Capable of handling 500 mW power dissipation in a compact form factor.
• Constructed from silicon material for reliable unidirectional operation.

Applications

• Voltage regulation circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer source, as Microchip Technology and other vendors like MCC produce variants under this designation. Confirm RoHS compliance status, as some versions may not meet current environmental standards. Check for obsolescence notices or product change notifications that might affect long-term availability or physical specifications before finalizing procurement plans.

Selection Notes

Select this component when a precise 4.3 V reference is required in a through-hole design. Ensure the circuit can accommodate the 1600 Ohm impedance characteristic. Verify that the 500 mW power rating aligns with the expected thermal load. Consider the ±5% tolerance if tighter voltage accuracy is necessary for the application requirements.

Part Context

This part belongs to the standard Zener diode family used for basic voltage clamping and regulation. It serves as a fundamental discrete semiconductor component within the broader category of diodes and rectifiers. The 1N4623 designation follows industry-standard numbering conventions for low-power voltage regulator diodes.

Replacement Considerations

Direct substitutes include the 1N4623-1E3 from Microchip Technology. Other compatible alternatives are the 1N749A from Central Semiconductor Corp and the BZX79C4V3 from onsemi.