1N4782A-1/TR

Overview

The Microchip Technology 1N4782A-1/TR is a temperature-compensated Zener diode designed for precision voltage regulation. It features a nominal breakdown voltage of 8.5 V with a tight tolerance of ±1%. The device has a maximum power dissipation of 250 mW and operates in a DO-35 (DO-204AH) axial through-hole package. It is supplied in tape and reel packaging for automated assembly processes.

Feature Summary

• Temperature-compensated design ensures stable voltage regulation across varying thermal conditions
• High precision voltage tolerance suitable for sensitive reference applications
• Robust axial leaded construction for reliable through-hole mounting

Applications

• Precision voltage reference circuits
• Temperature-stable voltage regulation systems
• Protection circuits requiring consistent clamping voltages

Procurement Notes

Verify the specific suffix -1 indicates the ±1% tolerance variant, distinct from standard tolerance versions. Confirm the -TR suffix denotes tape and reel packaging rather than bulk. Ensure the manufacturer is identified as Microchip Technology or its acquired entities like Microsemi, as supply chain history may affect part marking. Cross-reference datasheets for exact electrical limits before integration.

Selection Notes

Select this component when circuit stability against temperature drift is critical. The ±1% tolerance offers higher accuracy than standard Zener diodes. The DO-35 package is suitable for general-purpose boards where space allows axial leads. Consider the 250 mW power rating to ensure adequate thermal headroom in the final application environment.

Part Context

This part belongs to the 1N47xx series of Zener diodes, widely used for basic voltage regulation. The 1N4782A-1 variant specifically targets applications requiring tighter voltage control and better thermal performance than standard commercial grade parts. It serves as a specialized replacement for generic 8.5V references in industrial and military-grade electronics.

Replacement Considerations

Direct substitutes include other temperature-compensated 8.5V Zener diodes with ±1% tolerance in DO-35 packages. Verify that alternative manufacturers offer equivalent thermal coefficients and power ratings. Generic 1N4782A parts without the -1 suffix typically have wider tolerances (e.g., ±5%) and are not electrically equivalent for precision designs.