1N4781/TR

Overview

The 1N4781/TR is a single Zener diode manufactured by Microchip Technology, designed for voltage regulation and reference applications. It features a nominal Zener voltage of 8.5 V with a tolerance of ±5%. The device has a maximum power dissipation of 500 mW and a maximum Zener impedance of 100 Ohms. It operates within a temperature range of -55°C to +100°C. The component utilizes a DO-35 (DO-204AH) axial through-hole package and is supplied in tape and reel packaging.

Feature Summary

• Provides stable voltage regulation with a nominal 8.5 V Zener breakdown voltage
• Constructed in a compact DO-35 axial leaded package suitable for through-hole mounting
• Rated for 500 mW power dissipation with a wide operating temperature range
• Supplied in tape and reel format for automated assembly processes

Applications

• Voltage reference circuits requiring precise 8.5 V levels
• Overvoltage protection stages in low-power electronic systems
• Clamping applications for signal lines or power rails
• Temperature compensated biasing networks

Procurement Notes

Verify the specific suffix /TR indicates tape and reel packaging configuration when ordering. Confirm RoHS compliance status and manufacturer lot codes against current datasheets. Ensure the DO-35 package dimensions match PCB footprint requirements. Check for any regional distribution restrictions or supply limitations prior to finalizing procurement plans.

Selection Notes

Select this component when an 8.5 V Zener voltage is required in a through-hole axial package. The 500 mW power rating suits low-current regulation tasks. Consider the ±5% tolerance for precision requirements. Verify that the 100 Ohm impedance meets circuit stability needs. Ensure the operating temperature range covers the intended environmental conditions.

Part Context

This part belongs to the 1N47xx series of Zener diodes produced by Microchip Technology. The series offers various voltage ratings in standardized packages. The 1N4781 variant specifically targets the 8.5 V segment. The /TR suffix denotes bulk reel packaging, distinguishing it from loose tube or tray variants within the same electrical specification family.

Replacement Considerations

Cross-reference with other manufacturers offering 1N4781 equivalents in DO-35 packages. Verify identical 8.5 V Zener voltage, 500 mW power rating, and ±5% tolerance. Ensure mechanical compatibility with existing through-hole footprints. Confirm thermal performance matches original design constraints.