1N4964/TR

Overview

The Microchip Technology 1N4964/TR is a military-qualified, voidless hermetically sealed 5-watt glass Zener diode. It provides an 18V nominal Zener voltage with a standard 5% tolerance at a test current of 65mA. The device features a maximum reverse leakage current of 5µA and a Zener impedance of 4 Ohms. It operates within a temperature range of -65°C to +175°C and utilizes axial leads for through-hole mounting.

Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds
• Military qualification per MIL-PRF-19500/356 for high-reliability applications
• Inherently radiation hard design
• ESD nonsensitive per MIL-STD-750 Method 1020

Applications

• High-reliability aerospace systems
• Military electronic circuits
• Voltage regulation in extreme temperature environments

Procurement Notes

Verify the specific revision level and lot traceability documentation upon order confirmation. Confirm that the component meets the required MIL-PRF-19500/356 standards for your application. Ensure proper handling procedures are followed due to the hermetic seal integrity requirements associated with this package type.

Selection Notes

Select this component when a 5-watt power rating and wide operating temperature range are required. The 18V breakdown voltage suits specific reference or regulation needs. Verify that the axial lead configuration fits the target PCB layout constraints compared to surface-mount alternatives.

Part Context

This part belongs to the 1N4954 through 1N4996 series of 5-watt Zener diodes manufactured by Microsemi (now Microchip). These components are designed for rugged environments where failure is not an option. The series offers a broad selection of voltages from 3.3V to 390V with various tolerance options.

Replacement Considerations

Equivalent parts include JANS1N4964/TR and JANTX1N4964/TR. Surface-mount equivalents are available as 1N4964US/TR.