1N4686 BK PBFREE

Overview

The Central Semiconductor Corp 1N4686 BK PBFREE is a silicon Zener diode designed for low-level applications requiring extremely low operating current and low leakage. It features a nominal Zener voltage of 3.9 V with a 5% tolerance, tested at 50 μA. The device dissipates up to 500 mW and operates within a junction temperature range of -65°C to +200°C. Packaged in the DO-35 axial leaded case, it exhibits a maximum reverse leakage current of 5.0 μA at 2.0 V and supports a maximum regulator current of 70.0 mA.

Feature Summary

• Designed for applications requiring extremely low operating current (50μA) and low leakage characteristics.
• Provides stable voltage regulation with a 5% tolerance across the specified voltage range.
• Capable of handling high thermal stress with an extended junction temperature range up to +200°C.

Applications

• Low-level voltage reference circuits
• Precision voltage regulation
• Protection against transient overvoltages

Procurement Notes

Verify that the ordering suffix 'PBFREE' confirms lead-free plating compliance as per manufacturer standards. Confirm the 'BK' designation corresponds to bulk packaging requirements. Ensure the specific part number matches the required 3.9V nominal specification. Cross-reference the marking code C4686 for physical identification during assembly inspection.

Selection Notes

Select this component when circuit design demands minimal quiescent current consumption alongside precise voltage clamping. The DO-35 package suits through-hole mounting constraints. Evaluate the 500mW power dissipation limit against expected thermal loads. Consider the low leakage current specifications for high-impedance signal paths where noise floor minimization is critical.

Part Context

This device belongs to the 1N4678 through 1N4717 series of low-level silicon Zener diodes manufactured by Central Semiconductor. The series covers a voltage range from 1.8 V to 43 V, all sharing identical mechanical outlines and electrical testing conditions. These components are standardized for general-purpose voltage regulation tasks in consumer and industrial electronics.

Replacement Considerations

Compatible substitutes include other manufacturers' 1N4686 variants meeting the same DO-35 footprint and 3.9V nominal specification. Verify that alternative sources maintain the 5% tolerance and 500mW power rating. Ensure replacement parts support the required -65°C to +200°C operating temperature range.