1N4891

Overview

The Microsemi Corporation 1N4891 is a temperature-compensated Zener reference diode housed in an axial DO-204AA (DO-7) package. It provides a nominal Zener voltage of 6.35 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 400 mW and features a maximum dynamic impedance of 10 Ohms. This component is designed to offer ultra-stable voltage regulation suitable for precision applications requiring reliable reference performance under varying thermal conditions.

Feature Summary

• Temperature compensated design for enhanced stability
• Precision voltage regulation capability
• Ultra-stable reference performance

Applications

• Voltage stabilization circuits
• Precision voltage references
• Power management systems

Procurement Notes

Verify the manufacturer designation as Microsemi Corporation or its successor entities, noting that corporate acquisitions may affect branding on legacy components. Confirm the package style matches the specified DO-204AA axial configuration. Ensure the part number corresponds exactly to the 6.35 V variant. Check for any specific handling requirements associated with the bulk packaging format typically used for this component type.

Selection Notes

Select this component when a stable 6.35 V reference is required with low dynamic impedance characteristics. The 400 mW power rating dictates the current limits for safe operation. Consider the axial leaded package for through-hole mounting constraints. Verify that the ±5% tolerance meets the circuit's accuracy requirements compared to tighter tolerance alternatives.

Part Context

This component belongs to the series of temperature-compensated Zener reference diodes produced by Microsemi Corporation. These devices are engineered to minimize voltage drift over temperature changes, distinguishing them from standard Zener diodes. The 1N4891 specifically targets applications needing a reliable, stable voltage baseline without complex compensation networks.

Replacement Considerations

Direct substitutes must match the 6.35 V Zener voltage, 400 mW power rating, and axial DO-204AA package. Verify that alternative manufacturers provide equivalent temperature compensation characteristics and dynamic impedance specifications to ensure circuit compatibility.