1N4681 BK PBFREE

Overview

The 1N4681 BK PBFREE is a silicon Zener diode from the Central Semiconductor 1N4678 series, designed for low-level applications requiring extremely low operating current and leakage. It features a nominal Zener voltage of 2.4 V with a 5% tolerance range (2.280 V to 2.520 V). The device operates at a test current of 50 μA and dissipates up to 500 mW. It utilizes a DO-35 through-hole package and supports junction temperatures from -65°C to +200°C.

Feature Summary

• Designed for applications requiring extremely low operating current and low leakage
• Provides stable voltage regulation within a tight 5% tolerance band
• Capable of operation across an extended temperature range

Applications

• Low power voltage reference circuits
• Precision voltage regulation in sensitive electronics
• Protection against overvoltage in low-current systems

Procurement Notes

Verify that the part number includes the 'PBFREE' suffix to confirm lead-free plating compliance as specified by the manufacturer. Ensure the ordering code matches the exact 1N4681 designation to secure the correct 2.4 V nominal voltage rating. Confirm the DO-35 package type aligns with the intended PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when circuit design demands minimal quiescent current consumption alongside precise low-voltage stabilization. The 50 μA test current specification makes it suitable for battery-operated or energy-efficient designs where standard Zener diodes would introduce excessive drain. Verify that the maximum reverse leakage current meets the specific noise floor requirements of the application.

Part Context

This component belongs to the 1N4678 through 1N4717 series of low-level silicon Zener diodes manufactured by Central Semiconductor Corp. The series covers a voltage range from 1.8 V to 43 V, all sharing common mechanical outlines and thermal characteristics. The 1N4681 specifically addresses the lower end of this spectrum, providing a compact solution for sub-3V regulation needs.

Replacement Considerations

Compatible substitutes include other manufacturers' 1N4681 variants or equivalents within the 1N4678 series family. When replacing, ensure the substitute maintains the 50 μA test current requirement and DO-35 package dimensions to preserve circuit performance and physical fit.