1N4691D/TR

Overview

The 1N4691D/TR is a Zener diode manufactured by Microchip Technology, designed for voltage regulation and reference applications. It features a nominal Zener voltage of 6.2 V with a tight tolerance of ±2%. The device is rated for a maximum power dissipation of 0.5 W and operates within an extended temperature range from -65 °C to +175 °C. Packaged in the MELF-2 (DO-213AA) surface-mount format, it utilizes a glass encapsulation and tin/lead terminal finish. This component is part of Microchip's high-reliability, metallurgically bonded series intended for demanding electronic environments.

Feature Summary

• High reliability construction with metallurgical bonding
• Extended operating temperature capability up to 175 °C
• Tight voltage tolerance for precise regulation
• Surface-mount MELF package for compact designs

Applications

• Precision voltage reference circuits
• Over-voltage protection stages
• Temperature-compensated bias networks

Procurement Notes

Verify the specific suffix 'D' against official Microchip documentation to confirm the exact voltage tolerance and test current parameters, as generic listings may not reflect the precise electrical characteristics required for your design. Ensure the MELF-2 package compatibility matches your PCB footprint. Confirm RoHS status and lead material specifications if environmental compliance is mandatory for your assembly process.

Selection Notes

Select this component when a stable 6.2 V reference is required in a surface-mount configuration. The ±2% tolerance makes it suitable for applications needing tighter regulation than standard 5% or 10% Zener diodes. Consider the 0.5 W power rating and thermal management requirements for the MELF-2 package. Verify that the high-temperature rating aligns with the operational environment of the target system.

Part Context

This part belongs to Microchip's legacy 1N46xx series of Zener diodes, adapted for modern surface-mount manufacturing through the MELF form factor. These devices are engineered for high reliability and are often used in aerospace, military, and industrial applications where long-term stability and wide temperature operation are critical. The 'TR' suffix indicates tape-and-reel packaging for automated assembly.

FAQ

What is the significance of the 'D' suffix in the part number?

The 'D' suffix typically denotes a specific voltage tolerance band, which for the 1N4691 series is generally ±2%, distinguishing it from other tolerance variants like 'B' or 'C'.

Is the 1N4691D/TR RoHS compliant?

Compliance depends on the specific manufacturing lot and region. While many Microchip Zeners are RoHS compliant, users must verify the current datasheet or orderable part details for the specific RoHS status of the 1N4691D/TR variant.