1N4688

Overview

The Microchip Technology 1N4688 is a silicon planar Zener diode designed for voltage regulation applications. It belongs to the JEDEC registered 1N4678 through 1N4717 series and features internal metallurgical bonding for enhanced reliability. The device offers a standard voltage tolerance of ±5%, with tighter tolerances of 2% and 1% available upon request. Key electrical characteristics include a maximum power dissipation of 500 mW, a reverse leakage current of 10 µA at 3 V, and a maximum forward voltage of 1.1 V at 200 mA. The component supports an operating temperature range from -65°C to +175°C.

Feature Summary

• JEDEC registered construction within the 1N4678-1N4717 series
• Internal metallurgical bond for structural integrity
• Standard ±5% voltage tolerance with optional tighter specifications

Applications

• Voltage regulation circuits
• Reference voltage generation
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer source when procuring, as the 1N4688 designation is utilized by multiple vendors including Microchip, Vishay, and Central Semiconductor. Confirm that the selected unit meets the required JEDEC registration standards and metallurgical bonding specifications. Ensure the tolerance grade matches the design requirements, as tighter tolerances may require specific ordering suffixes or requests depending on the supplier.

Selection Notes

Select this component for applications requiring robust voltage regulation with high thermal stability. The wide operating temperature range up to +175°C makes it suitable for demanding environments. Consider the availability of tighter voltage tolerances if precision is critical. Verify compatibility with existing PCB footprints and ensure the 500 mW power rating aligns with the circuit's dissipation needs.

Part Context

The 1N4688 is part of a long-standing family of Zener diodes standardized by JEDEC. This series is widely recognized in industrial and commercial electronics for its reliability. The internal metallurgical bond distinguishes these devices from standard plastic-packaged alternatives, offering improved resistance to mechanical stress and thermal cycling.

Replacement Considerations

Cross-reference with other manufacturers' 1N4688 parts such as those from Vishay or Central Semiconductor. Verify pinout compatibility and ensure equivalent electrical parameters, particularly the 500 mW power rating and ±5% tolerance.