1N4944

Overview

The Microchip Technology 1N4944 is a Zener voltage regulator diode designed for through-hole mounting. It features a nominal Zener voltage of 75 V with a 5% tolerance and a power dissipation rating of 500 mW. The device operates within a temperature range of -65°C to +175°C and utilizes the DO-35-2 axial leaded package. Key electrical characteristics include a maximum reverse leakage current of 5 µA at the rated voltage and a Zener impedance of 14 Ohms, tested at a specific current of 17 mA.

Feature Summary

• Provides stable voltage regulation in the 75 V range for circuit protection and reference applications
• Capable of operating reliably in high-temperature environments up to 175°C
• Utilizes an axial leaded package suitable for standard through-hole PCB assembly

Applications

• Voltage regulation in industrial control systems
• Overvoltage protection circuits
• Reference voltage sources in measurement equipment

Procurement Notes

Verify the specific suffix or revision code against the manufacturer's latest datasheet to ensure compatibility with design requirements. Confirm RoHS compliance status as indicated in official documentation. Cross-reference the part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when a 75 V regulation point is required with moderate power handling capabilities. Ensure the circuit design accommodates the specified thermal dissipation limits. Verify that the operating temperature range aligns with the environmental conditions of the target application.

Part Context

This component belongs to the standard Zener diode family manufactured by Microchip Technology. It is commonly used in general-purpose electronics where reliable voltage clamping is necessary. The DO-35 package offers a compact form factor for space-constrained designs.

Replacement Considerations

Consult official substitution guides for equivalent parts from other manufacturers. Verify pinout compatibility and electrical parameter tolerances before replacing.