1N4745AP/TR8

Overview

The Microchip Technology 1N4745AP/TR8 is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 16 V with a tight tolerance of ±2%. The device supports a maximum power dissipation of 1 W and operates within an extended temperature range from -65°C to +175°C junction temperature. Packaged in the axial DO-41 (DO-204AL) format, it exhibits a maximum reverse leakage current of 5 µA at 12.2 V and a Zener impedance of 16 Ohms at the test current of 15.5 mA.

Feature Summary

• Provides precise voltage regulation with a ±2% tolerance on the 16 V Zener voltage.
• Capable of handling high thermal loads with a 1 W power dissipation rating.
• Engineered for extreme environments with an operational junction temperature range up to +175°C.

Applications

• Precision voltage reference circuits requiring low tolerance stability.
• Over-voltage protection stages in industrial control systems.
• Clamping applications in high-temperature electronic assemblies.

Procurement Notes

Verify the specific suffix configuration against official Microchip documentation to confirm the exact electrical tolerances and packaging specifications. Ensure that the procurement channel provides valid traceability data consistent with the manufacturer's quality standards. Cross-reference the part number with the latest datasheet to validate compliance with RoHS directives and environmental regulations before finalizing acquisition.

Selection Notes

Select this component when circuit design demands superior voltage accuracy compared to standard ±5% variants. The ±2% tolerance makes it suitable for precision instrumentation where tighter regulation is critical. Consider the 1 W power rating for applications involving higher current loads or elevated ambient temperatures. Verify that the DO-41 through-hole package aligns with the target PCB layout constraints.

Part Context

This component belongs to the 1N4745 series of Zener diodes manufactured by Microchip Technology. While the base 1N4745 typically offers ±5% tolerance, the AP designation indicates a tighter ±2% specification. The TR8 suffix denotes tape and reel packaging, facilitating automated surface-mount or through-hole insertion processes in high-volume manufacturing environments.

Replacement Considerations

Direct substitutes include other 16 V Zener diodes with ±2% tolerance and 1 W power ratings. Equivalent parts from other manufacturers must match the DO-41 package dimensions and thermal characteristics. Verify that alternative components meet the same maximum operating temperature and leakage current requirements.