1N5349B

Overview

The Microsemi Corporation 1N5349B is a silicon axial-leaded Zener diode with a nominal voltage of 12 V and a maximum power dissipation of 5.0 W at 25°C. It features a ±5% voltage tolerance, a test current of 100 mA, and a maximum dynamic impedance of 2.5 Ω. The device operates within a temperature range of -65°C to +150°C and utilizes a T-18 plastic encapsulated package.

Feature Summary

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

Applications

• Voltage regulation circuits requiring 12 V reference
• Overvoltage protection for sensitive electronic components
• Power supply input transient suppression

Procurement Notes

Verify the manufacturer designation as Microsemi Corporation or its successor entities. Confirm the specific suffix 'B' indicates the standard ±5% tolerance. Ensure the package type matches the required T-18 axial lead configuration. Check for RoHS compliance status if environmental regulations apply to the assembly process.

Selection Notes

Select this component when a 5 W power rating and 12 V regulation are required in an axial package. Consider thermal derating curves for ambient temperatures exceeding 25°C. Evaluate the 2.5 Ω dynamic impedance against circuit sensitivity requirements. Compare against surface mount equivalents like SMBJ5349B if board space is constrained.

Part Context

This part belongs to the JEDEC registered 1N5333B through 1N5388B series of 5.0 Watt Zener diodes. The series covers voltages from 3.3 V to 200 V. The 'B' suffix specifically denotes a standard ±5% voltage tolerance. Military screening options exist via MQ, MX, or MV prefixes.

Replacement Considerations

Surface mount equivalents include SMBJ5349B or SMBG5349B. Verify that replacement parts maintain the 5 W power rating and 12 V nominal voltage. Ensure the new component supports the required -65°C to +150°C operating temperature range.