1N4742AP/TR8

Overview

The Microchip Technology 1N4742AP/TR8 is a 1.0 W Zener diode housed in the DO-41 axial package. It provides a nominal Zener voltage of 12 V with a tight tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse leakage current of 1 µA at 1 V. Packaged in reels, it is designed for through-hole mounting applications requiring stable voltage regulation.

Feature Summary

• Provides precise voltage regulation with ±5% tolerance
• Operates reliably in high-temperature environments up to +175°C
• Utilizes plastic encapsulation for moisture resistance

Applications

• Voltage reference circuits
• Overvoltage protection
• Power supply regulation

Procurement Notes

Verify the specific suffix 'TR8' against the manufacturer's official documentation to confirm reel packaging specifications and quantity per unit. Ensure compatibility with existing assembly processes regarding the DO-41 axial lead form factor and thermal management requirements for 1 W power dissipation.

Selection Notes

Select this component when a 12 V regulation point with tighter than standard tolerance is required. The extended operating temperature range makes it suitable for industrial or automotive environments where standard commercial grade parts may fail. Confirm that the 1 W power rating aligns with the circuit's expected load conditions.

Part Context

This part belongs to the 1N47xx series of 1 Watt Zener diodes manufactured by Microchip Technology (formerly Microsemi). The 'AP' designation typically indicates a 5% voltage tolerance, distinguishing it from standard 'A' variants which often have 10% tolerance. The series offers extensive voltage selection from 3.3 V to 100 V in the DO-41 package.

Replacement Considerations

Cross-reference with other manufacturers offering 1N4742A equivalents in DO-41 packages. Verify that any substitute matches the 12 V nominal voltage, ±5% tolerance, 1 W power rating, and high-temperature capability.