1N5349B

Overview

The onsemi 1N5349B is a single-channel Zener voltage regulator diode from the 1N53 Series, housed in an axial lead DO-15 (Surmetic 40) package. It features a nominal reverse Zener voltage of 12 V with a ±5% tolerance and a maximum steady-state power dissipation of 5 W at 25°C. The device operates within a junction temperature range of -65°C to +200°C and includes silicon-oxide passivated junctions for environmental protection.

Feature Summary

• Utilizes silicon-oxide passivated junctions for enhanced reliability and environmental protection
• Provides tight electrical limits and superior operating characteristics across the series
• Features corrosion-resistant external surfaces and readily solderable leads

Applications

• Voltage regulation circuits requiring stable reference voltages
• Power supply protection against transient overvoltage events
• General-purpose electronic equipment utilizing through-hole mounting

Procurement Notes

Verify the specific ordering suffix when purchasing. The 'G' suffix indicates a Pb-Free package, while other suffixes may denote different packaging formats such as tape and reel or box quantities. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing standards before finalizing procurement orders.

Selection Notes

Select this component for applications requiring a precise 12 V reference with high surge capability. Ensure the thermal design accounts for the 5 W power rating and the specified junction-to-lead thermal resistance. Verify that the operating environment stays within the -65°C to +200°C temperature range to maintain performance integrity.

Part Context

This part belongs to the 1N53 Series of 5 Watt Zener Voltage Regulators. The series covers a wide voltage range from 3.3 V to 200 V, all sharing the same Surmetic 40 axial lead package. This family is designed for robust performance in common environmental conditions, offering consistent electrical parameters across various voltage ratings.

Replacement Considerations

Direct substitutes include parts from other manufacturers using the same JEDEC designation, such as those from Microsemi or Central Semiconductor Corp. Ensure any replacement maintains the 5 W power rating, DO-15 package dimensions, and ±5% voltage tolerance to guarantee circuit compatibility.