1N5518D/TR

Overview

The Microchip Technology 1N5518D/TR is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 3.3 V with a tight tolerance of ±1%. The device operates in the through-hole DO-204AH (DO-35) glass package and supports a maximum power dissipation of 500 mW. Key electrical characteristics include a maximum Zener impedance of 26 ohms at 20 mA and a low reverse leakage current of 5 µA at 1 V. The component is rated for junction temperatures ranging from -65°C to +175°C, ensuring reliability across wide thermal conditions.

Feature Summary

• High precision voltage regulation with ±1% tolerance
• Low reverse leakage current for stable performance
• Hermetically sealed glass construction for durability

Applications

• Precision voltage reference circuits
• Overvoltage protection stages
• Clamping applications in sensitive electronics

Procurement Notes

Verify that the ordering suffix /TR indicates tape-and-reel packaging rather than bulk units. Confirm the specific manufacturer lot and date code requirements for your production schedule. Ensure the procurement channel provides valid traceability documentation for this military-grade or high-reliability variant. Check for RoHS compliance status if required by your assembly specifications.

Selection Notes

Select this component when a precise 3.3 V reference is required with minimal variance. The ±1% tolerance makes it suitable for accuracy-critical designs where standard 5% or 10% Zeners are insufficient. Consider the DO-35 package size constraints and the need for hermetic sealing in harsh environments. Evaluate the 500 mW power rating against expected surge currents to ensure safe operation margins.

Part Context

This part belongs to the 1N5518 series of low-voltage avalanche Zener diodes manufactured by Microchip Technology. The 'D' suffix typically denotes a specific tolerance band or testing standard, while '/TR' specifies the reel packaging format. It is functionally equivalent to other industry-standard 1N5518 variants but offers Microchip's specific quality and reliability standards.

Replacement Considerations

Compatible substitutes include the JANTXV1N5518D-1 and JANTXV1N5518D-1/TR from Microsemi/Microchip. These alternatives share the same 3.3 V specification and DO-35 package. Verify pinout compatibility and thermal characteristics before substitution.