1N4703 BK PBFREE

Overview

The Central Semiconductor Corp 1N4703 BK PBFREE is a silicon Zener diode designed for low-level applications requiring extremely low operating current and low leakage. It operates within a temperature range of -65°C to +200°C with a power dissipation rating of 500 mW at 75°C ambient. The nominal Zener voltage is 16 V, with a minimum of 15.2 V and a maximum of 16.8 V at a test current of 50 μA. Maximum reverse leakage current is 0.05 μA at 12.1 V. The device features a DO-35 axial leaded package.

Feature Summary

• Designed for applications requiring extremely low operating current (50μA) and low leakage characteristics.
• Provides stable voltage regulation within a wide junction temperature range from -65°C to +200°C.
• Utilizes a standard DO-35 case for through-hole mounting.

Applications

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

Procurement Notes

Verify the specific ordering suffix requirements when purchasing. The 'PBFREE' designation indicates lead-free plating compliance. Confirm that the 'BK' suffix aligns with your packaging needs, as bulk packaging specifications may vary by distributor lot. Ensure the component meets RoHS directives if required for your assembly process. Cross-reference the marking code C4703 on the physical device to confirm authenticity and part identity upon receipt.

Selection Notes

Select this component when circuit design demands minimal quiescent current draw during Zener operation. The 5% tolerance provides adequate precision for general-purpose regulation tasks. Consider the DO-35 package dimensions for PCB layout constraints. Evaluate the thermal environment to ensure power dissipation remains within the 500 mW limit at elevated temperatures.

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 similar electrical profiles optimized for low-current operation. The 1N4703 specifically targets the 16 V segment of this lineup, offering consistent performance across the extended industrial temperature spectrum defined by the manufacturer.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4703 variants meeting identical 16V/500mW/DO-35 specifications. Verify that replacement parts maintain the 50μA test current requirement and comparable leakage levels to ensure circuit compatibility without redesign.