1N943A

Single Zener Diodes Overview

The Microchip Technology 1N943A-1 is a temperature-compensated Zener diode designed for precision voltage regulation applications. It features a nominal Zener voltage of 11.7 V with a tight tolerance of 1%. The device operates at a test current of 7.5 mA and exhibits a low Zener impedance of 30 Ohms. It is housed in a DO-7-2 through-hole package, supporting a maximum power dissipation of 500 mW. The component maintains stable performance across an extended operating temperature range from -55°C to +100°C, ensuring reliability in demanding environments.

Single Zener Diodes Feature Summary

• Temperature compensated design ensures stable voltage regulation across varying thermal conditions
• High precision voltage tolerance provides accurate reference levels for sensitive circuits
• Robust through-hole construction supports reliable mounting in industrial assemblies

Single Zener Diodes Applications

• Precision voltage reference circuits requiring minimal drift
• Overvoltage protection systems in harsh environments
• Test and measurement equipment calibration standards

Single Zener Diodes Procurement Notes

Verify the specific suffix designation when ordering, as variations such as -1 or G may indicate differences in packaging or manufacturing lot specifications. Confirm RoHS compliance status directly with the manufacturer, as indicated by the N marking in available documentation. Ensure that the required through-hole footprint matches the DO-7-2 package dimensions for proper integration into the target PCB layout.

Single Zener Diodes Selection Notes

Select this component when high stability over temperature is critical, distinguishing it from standard Zener diodes. The 1% tolerance makes it suitable for applications where voltage accuracy cannot be compromised. Consider the 500 mW power rating to ensure adequate thermal headroom during operation. The through-hole format is preferred for high-reliability mechanical connections compared to surface-mount alternatives.

Single Zener Diodes Part Context

This part belongs to the legacy 1N series of semiconductor devices, widely recognized in industrial and military electronics. Microchip Technology continues to support these components to maintain compatibility with existing designs. The 1N943A specifically addresses the need for regulated voltages in the 11-12 V range with superior thermal characteristics compared to non-compensated variants.

Single Zener Diodes Replacement Considerations

The JANTX1N943B-1 serves as a verified substitute within the same family, offering similar electrical characteristics with potentially different tolerance grades. Verify pinout compatibility and package dimensions before substitution to ensure seamless integration without circuit modification.