1N5378/TR12

Overview

The Microsemi Corporation 1N5378/TR12 is a silicon 5.0-watt Zener diode from the JEDEC registered 1N5333B through 1N5388B series, housed in an axial-lead T-18 package and supplied in tape-and-reel format. It provides voltage regulation at a nominal Zener voltage of 100 V with a standard ±5% tolerance. The device operates within a temperature range of -65°C to +150°C and features a maximum dynamic impedance of 90 ohms at a test current of 12 mA. It withstands high surge stresses and offers flexible mounting terminals.

Feature Summary

• Provides stable voltage regulation across broad operating current and temperature ranges
• Withstands high surge stresses and non-sensitive to electrostatic discharge
• Features flexible axial-lead mounting terminals for versatile integration
• Plastic encapsulated body with minimal changes in voltage versus current

Applications

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

Procurement Notes

Verify that the part number suffix matches the required packaging configuration, as the TR designation indicates tape-and-reel delivery. Confirm compliance requirements against specific project standards, noting that RoHS compliant versions utilize the e3 suffix. Ensure adequate heat sinking is planned, as the maximum steady-state power dissipation depends on lead temperature or ambient conditions on a printed circuit board.

Selection Notes

Select this component when a 100 V Zener voltage with ±5% tolerance is required in a 5-watt axial-leaded package. Consider the thermal resistance characteristics and derating curves if operating near maximum power limits. Verify that the available surge current rating meets the transient protection requirements of the target application environment.

Part Context

This component belongs to the Microsemi 1N5333B through 1N5388B series of silicon 5-watt Zener diodes. The series covers a wide selection of voltages from 3.3 V to 200 V, differentiated by suffix letters indicating specific voltage tolerances. The 1N5378 variant specifically targets the 100 V regulation point within this extensive lineup.

Replacement Considerations

Surface mount equivalents are available in the SMBJ5333 to SMBJ5388B and SMBG5333B to SMBG5388B series, offering identical electrical characteristics in DO-215AA packages.