1N6331US/TR

Overview

The Microchip Technology 1N6331US/TR is a surface-mount Zener voltage regulator in the B-SQ MELF package. It provides a nominal Zener voltage of 20V with a standard tolerance of ±5%. The device operates at a test current (IZ) of 6.2mA and exhibits a maximum dynamic impedance of 18 ohms. It supports a maximum regulator current (IZM) of 15mA and dissipates up to 0.5W. The component is qualified per MIL-PRF-19500/533, features voidless hermetically sealed glass construction, and utilizes Category III internal metallurgical bonds.

Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs for robust construction.
• Internal Category III metallurgical bonds ensuring high reliability.
• Qualified to MIL-PRF-19500/533 standards for military applications.
• Non-sensitive to electrostatic discharge.

Applications

• High-reliability voltage regulation where failure cannot be tolerated.
• Surface mount equivalents for JEDEC registered axial-leaded series.
• Radiation-hardened circuit designs.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's nomenclature guide to confirm voltage tolerance and RoHS compliance status. Ensure the procurement specification matches the required reliability level (JAN, JANTX, JANTXV, or JANS) as commercial versions differ from military-qualified units. Confirm tape and reel packaging details align with EIA-481-B standards if automated assembly is required.

Selection Notes

Select this component when a surface-mount solution is required for the 1N6309 through 1N6355 series. Consider the 18-ohm dynamic impedance and 15mA maximum current limits for circuit design. Verify that the operating temperature range of -65°C to +175°C meets system requirements. Choose tighter tolerances only if the specific part nomenclature indicates C or D suffixes.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener voltage regulators. The series offers selections from 2.4V to 200V with various tolerance options. It serves as the surface-mount counterpart to the industry-standard axial-leaded DO-35 packages, maintaining identical electrical characteristics within the same reliability framework.

Replacement Considerations

Direct replacements include other manufacturers' 1N6331 variants in the DO-35 package if leaded mounting is acceptable. For surface-mount needs, verify compatibility with other 1N6331-equivalent MELF devices from different suppliers, ensuring matching voltage, power dissipation, and thermal resistance specifications.