1N4745UR

Overview

The Microchip Technology 1N4745UR is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 16V with a standard tolerance of 10%. The device is rated for a maximum power dissipation of 1W and operates within an extended temperature range from -65°C to +175°C. It utilizes the DO-213AB (MELF) surface-mount package, providing a compact form factor suitable for automated assembly processes.

Feature Summary

• Hermetically sealed glass encapsulation ensures environmental protection and long-term reliability in harsh conditions.
• Internal metallurgical bonding between the die and metal slugs enhances mechanical stability and thermal performance.
• Surface-mount MELF package design facilitates efficient PCB layout and high-volume manufacturing integration.

Applications

• Voltage reference circuits requiring stable DC levels
• Over-voltage protection stages in sensitive electronic systems
• Clamping applications in signal processing paths

Procurement Notes

Verify the specific suffix configuration against the official datasheet to ensure compatibility with required tolerance and screening levels. Confirm RoHS compliance status if restricted substances are prohibited in the target application. Cross-reference the manufacturer's latest revision history to validate component availability and lifecycle status before finalizing procurement plans.

Selection Notes

Select this component when a 16V regulation point is required in a surface-mount environment. Ensure the circuit design accommodates the 1W power rating and the specified 10% voltage tolerance. Verify that the operating temperature range aligns with the system's thermal profile and that the MELF footprint matches the board layout constraints.

Part Context

This part belongs to the 1N47xx series of 1-watt Zener diodes manufactured by Microchip Technology. The series offers various voltage options within a standardized glass-encapsulated package. The UR designation typically indicates a specific surface-mount variant optimized for reliability and automated handling in industrial and commercial electronics.

Replacement Considerations

Direct substitutes include other 1N4745 variants such as 1N4745A or 1N4745AE3, provided they meet the same 16V, 1W, and package specifications. Verify electrical parameters and physical dimensions before substitution to ensure functional equivalence.