1N4688 BK PBFREE

Overview

The Central Semiconductor Corp 1N4688 BK PBFREE is a silicon Zener diode designed for low-level applications requiring extremely low operating current and leakage. It features a nominal Zener voltage of 4.7 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. It utilizes the DO-35 axial leaded package.

Feature Summary

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

Applications

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

Procurement Notes

Verify that the component matches the exact part number 1N4688 BK PBFREE. Confirm the manufacturer is Central Semiconductor Corp. Ensure the datasheet revision aligns with your design requirements. Check RoHS compliance status if required by your manufacturing standards. Validate the DO-35 package dimensions against your PCB footprint.

Selection Notes

Select this component when a precise 4.7 V reference is needed with minimal quiescent current draw. The low leakage current makes it suitable for high-impedance circuits. Consider the 500 mW power dissipation limit and ensure adequate thermal management within the specified temperature range.

Part Context

This device belongs to the 1N4678 through 1N4717 series of low-level silicon Zener diodes. The series covers voltages from 1.8 V to 43 V, all sharing similar electrical characteristics and the DO-35 mechanical outline. The 'BK' suffix typically denotes bulk packaging, while 'PBFREE' indicates lead-free plating.

Replacement Considerations

Compatible replacements include other manufacturers' 1N4688 variants or equivalents within the 1N4678-1N4717 series. Verify that substitute parts meet the same 500 mW power rating, 5% tolerance, and DO-35 package constraints.

FAQ

What is the maximum reverse leakage current for the 1N4688?

The maximum reverse leakage current is 10 μA, measured at a reverse voltage of 3.0 V.

How is the Zener voltage defined for this component?

The Zener voltage is nominally 4.7 V, with a minimum of 4.465 V and a maximum of 4.935 V, tested at a current of 50 μA.

What is the marking code for this specific diode?

The device is marked with the code C4688, which may be prefixed with a 'C' as per the manufacturer's standard marking scheme.