1N5349C/TR12

Overview

The Microchip Technology 1N5349C/TR12 is a silicon 5.0-watt Zener diode from the JEDEC registered 1N5333-5388B series, manufactured by the Microsemi Scottsdale Division. It provides voltage regulation at a nominal Zener voltage of 12 V with a tight tolerance of ±2%, indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features an axial-lead T-18 package. The '/TR12' designation specifies tape and reel packaging compliant with EIA-296 standards.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole applications
• Withstands high surge stresses and exhibits minimal voltage change versus current
• Moisture classification Level 1 requiring no dry pack storage

Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage sources in measurement equipment

Procurement Notes

Verify the component origin as this part number originates from the Microsemi Scottsdale Division, which was acquired by Microchip Technology. Confirm that the specific manufacturing lot aligns with the requested datasheet revision (e.g., Rev D) and ensure the RoHS compliance status matches project requirements, as legacy screening levels may vary.

Selection Notes

Select this component when a precise 12 V reference with ±2% tolerance is required in a 5 W axial package. Ensure adequate heat sinking is provided to maintain junction temperatures within limits, as steady-state power dissipation depends on lead length or PCB copper pad area. Verify that the maximum regulator current and surge current ratings exceed the circuit's peak demands.

Part Context

This device belongs to the 1N5333B through 1N5388B series of silicon 5-watt Zener diodes. The series offers a wide selection of voltages from 3.3 V to 200 V. The 'C' suffix specifically denotes a tighter ±2% voltage tolerance compared to the standard ±5% 'B' suffix devices. These plastic encapsulated diodes are designed for high DC currents with low thermal resistance.

Replacement Considerations

Equivalent parts include other 12 V, 5 W Zener diodes in the T-18 package with ±2% tolerance. Cross-reference with the 1N5349B (±5% tolerance) if wider voltage variation is acceptable. Military screened equivalents such as the MX1N5349 are available via prefix identifiers.