1N4740UR-1/TR

Overview

The Microchip Technology 1N4740UR-1/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB package, electrically equivalent to the 1N4740A axial series. It features a nominal Zener voltage of 10 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and includes a maximum reverse current of 10 µA at 7.6 V. Key electrical parameters include a dynamic impedance of 7 Ohms at a test current of 25 mA and a maximum regulator current of 91 mA.

Feature Summary

• Hermetically sealed glass construction suitable for high-reliability applications
• Surface mount design ideal for high-density mounting with low parasitic requirements
• Inherently radiation hard per MicroNote 050
• ESD nonsensitive operation

Applications

• Voltage regulation in high-density electronic circuits
• High-reliability systems requiring source control drawings
• Applications necessitating radiation hardness

Procurement Notes

Verify that the ordering suffix 'TR' confirms tape and reel packaging as specified in the datasheet. Confirm the '1' designation aligns with the standard ±5% tolerance variant rather than tighter tolerance options. Ensure compatibility with the DO-213AB footprint and check for specific screening prefixes if MIL-PRF-19500 compliance is required.

Selection Notes

Select this component when a surface mount solution is needed for 10 V regulation with 1 W power dissipation. Consider the DO-213AB package dimensions for PCB layout. Verify thermal derating requirements based on ambient versus end-cap temperatures. Compare against axial equivalents if space constraints allow for alternative form factors.

Part Context

This part belongs to the 1N4728UR through 1N4764AUR series of surface mount Zener diodes. It serves as the SMD equivalent to the registered 1N4728A through 1N4764A axial leaded devices. The series covers Zener voltages from 3.3 V to 100 V, offering standardized tolerances and hermetic sealing for robust performance in demanding environments.

Replacement Considerations

The 1N4740A is the direct axial leaded equivalent. Surface mount alternatives include the MLL4740A designation. For tighter tolerances, consider variants with C or D suffixes if available in the same package.