1N1374A

Overview

The Microchip Technology 1N1374A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 91 V with a tolerance of ±5% and a maximum power dissipation of 10 W. The device utilizes a DO-203AA (DO-4) metal package with a solder lug terminal, suitable for post/stud mounting. Operating at a test current of 50 mA, it exhibits a maximum impedance of 35 Ohms. This unidirectional component is classified as an active discrete semiconductor product.

Feature Summary

• High power handling capability with 10 W maximum dissipation rating
• Robust metal construction in a DO-4 package for thermal stability
• Precision voltage regulation with ±5% tolerance at 91 V
• Designed for stud or post mounting via solder lug terminals

Applications

• Voltage reference circuits requiring stable 91 V levels
• Overvoltage protection in high-power industrial systems
• Clamping applications in power supply outputs
• Surge suppression in heavy-duty electronic equipment

Procurement Notes

Verify the specific manufacturer source, as the part number appears associated with both Microchip Technology and aftermarket suppliers like IR Industrial Controls. Confirm that the received component matches the 1N1374A specification sheet, particularly the 91 V Zener voltage and 10 W power rating. Ensure the package type is DO-203AA/DO-4 with a solder lug, as variations may exist between original and replacement sources. Check for any suffix differences that might indicate variant tolerances or packaging styles.

Selection Notes

Select this component when a precise 91 V regulation point is required in high-power environments. The 10 W dissipation rating makes it suitable for applications where standard surface-mount Zeners would fail due to thermal limits. The DO-4 metal package allows for direct heat sinking via the chassis, improving reliability in harsh conditions. Consider the 35 Ohm impedance if low dynamic resistance is critical for the regulation accuracy of the target circuit.

Part Context

The 1N1374A belongs to the family of axial leaded Zener diodes, specifically those utilizing the legacy DO-4 metal case style. These components are often used in military, aerospace, or industrial standards where ruggedness and high power density are prioritized over miniaturization. The designation follows the JEDEC-95 coding system for diode packages. Similar parts in this category typically offer higher power ratings than plastic-encased equivalents but require specific mounting hardware compatible with the solder lug design.

Replacement Considerations

The 1N1374E3 is listed as a related part number, potentially indicating a lead-free variant or specific manufacturing revision. Aftermarket sources list the 1N1374A as being replaced by items from IR Industrial Controls; verify electrical equivalence before substitution. Ensure any replacement maintains the 91 V nominal voltage, 10 W power rating, and DO-4 package form factor to fit existing mechanical constraints.