1N4745AUR

Overview

The Microchip Technology 1N4745AUR is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 20 V with a tolerance of ±5%. The device operates in the surface-mount DO-213AB (SMB) package and supports a maximum steady-state power dissipation of 1 W. Key electrical characteristics include a maximum reverse leakage current of 100 nA, a dynamic impedance of 22 Ohms at the test current of 12.5 mA, and a forward voltage of 1.2 V. The component is rated for an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Provides stable voltage regulation with a nominal 20 V Zener breakdown characteristic.
• Engineered for high-reliability performance within an extended industrial temperature range.
• Utilizes a hermetically sealed glass MELF-style surface-mount package for robust environmental protection.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in electronic systems
• General-purpose voltage regulation in power supplies

Procurement Notes

Verify the specific suffix UR against official Microchip documentation to confirm the reel packaging configuration and ensure compatibility with automated assembly equipment. Confirm RoHS compliance status and lead-free terminal finish requirements prior to integration into the supply chain. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability.

Selection Notes

Select this component when a 20 V regulation point is required in a surface-mount design. Ensure the circuit layout accommodates the thermal dissipation limits of the DO-213AB package. Verify that the expected load current remains within the specified test current parameters to maintain accurate voltage regulation. Consider the low leakage current specification for sensitive analog front-end applications.

Part Context

This device belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. The series offers various voltage ratings and power dissipation capabilities, catering to diverse discrete semiconductor needs. The 1N4745 variant specifically targets the 20 V segment, providing a reliable solution for legacy and modern designs requiring standardized voltage references.

Replacement Considerations

Compatible substitutes include the 1N4745A/TR and 1N4745AURE3 variants from Microchip Technology, which share identical electrical specifications but may differ in packaging format or compliance markings. Other manufacturers producing JEDEC-standard 1N4745 devices in equivalent surface-mount packages may serve as functional alternatives if pinout and thermal characteristics align.