1N5520C/TR

Overview

The 1N5520C/TR is a single Zener diode manufactured by Microchip Technology, designed for voltage regulation and reference applications. It features a nominal Zener voltage of 3.9 V with a tight tolerance of ±2%. The device is rated for a maximum power dissipation of 500 mW and exhibits a maximum Zener impedance of 22 Ohms at a test current of 20 mA. It is housed in a DO-204AH (DO-35) through-hole glass axial package and supplied in tape and reel packaging.

Feature Summary

• Provides precise voltage regulation with a tight ±2% tolerance on the 3.9 V Zener voltage.
• Utilizes a hermetically sealed glass axial construction suitable for robust through-hole mounting.
• Engineered for low-power applications with a 500 mW power dissipation rating.

Applications

• Voltage reference circuits requiring stable low-voltage sources
• Overvoltage protection in sensitive electronic systems
• Clamping applications in signal processing paths

Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging when ordering. Confirm that the ±2% tolerance variant matches the design requirements, as standard versions may have wider tolerances. Ensure the DO-35 footprint is compatible with the target PCB layout. Cross-reference the manufacturer part number to confirm it corresponds to the Microchip Technology product line rather than legacy Actel or other distributors.

Selection Notes

Select this component when a precise 3.9 V reference is needed with tighter accuracy than standard Zener diodes offer. The DO-35 package is appropriate for manual assembly or standard through-hole manufacturing processes. Consider the 22 Ohm impedance characteristic for dynamic load regulation performance. Verify thermal management capabilities are sufficient for the expected continuous power dissipation in the final enclosure.

Part Context

This component belongs to the 1N55xx series of small-signal Zener diodes. The 'C' suffix typically denotes the ±2% tolerance grade, distinguishing it from standard 5% or 10% variants. The 'TR' suffix specifies the reel packaging format. Microchip Technology acquired the semiconductor assets previously associated with Actel and Atmel, which explains historical branding variations in some databases.

Replacement Considerations

Direct replacements include other 3.9 V Zener diodes in DO-35 packages with similar power ratings. Check datasheets for equivalent Zener impedance and temperature coefficients. Generic equivalents must match the 500 mW rating and ±2% tolerance if precision is required. Verify pinout compatibility, although axial leads are generally standardized.