1N5388C/TR12

Overview

The Microsemi Corporation 1N5388C/TR12 is a JEDEC registered silicon Zener diode with a nominal voltage of 200 V and a maximum power dissipation of 5.0 W at 25 °C. It features a tight ±2% tolerance indicated by the C suffix, a test current (IZT) of 5.0 mA, and a maximum dynamic impedance (ZZ) of 480 Ω. The device operates within a temperature range of -65 °C to +150 °C, has a maximum reverse current of 0.5 μA tested at 144 V, and withstands a maximum surge current of 1850 A.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Withstands high surge stresses and offers flexible axial-lead mounting terminals
• Features minimal changes in voltage versus current as specified by voltage regulation

Applications

• Voltage regulation circuits requiring high stability
• Overvoltage protection for sensitive electronic components
• Reference voltage sources in precision measurement equipment

Procurement Notes

Verify that the part number includes the TR12 suffix to confirm tape and reel packaging compliance with EIA-296 standards. Ensure the C suffix is present to guarantee the required ±2% voltage tolerance. Confirm RoHS compliance via the e3 designation if applicable to your assembly process. Cross-reference thermal derating curves against your specific PCB copper pad dimensions and lead lengths to ensure safe operation under steady-state conditions.

Selection Notes

Select this component when precise voltage regulation is critical due to its tight ±2% tolerance. Consider the 480 Ω dynamic impedance for circuit stability requirements. Evaluate the 5.0 W power rating against your heat sinking capabilities, noting that steady-state power drops significantly when mounted on FR4 boards without adequate thermal management compared to direct lead mounting.

Part Context

This device belongs to the 1N5333B through 1N5388B series of 5.0 watt axial-leaded Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers a wide voltage selection from 3.3 V to 200 V. The 1N5388 variant represents the upper end of this voltage range, providing robust regulation capabilities for high-voltage applications while maintaining standard plastic encapsulation and moisture classification Level 1.

Replacement Considerations

Equivalent parts include 1N5388B for standard ±5% tolerance or 1N5388D for tighter ±1% tolerance. Surface mount alternatives are available as SMBJ5388B or SMBG5388B. Military screening levels can be obtained using MQ, MX, or MV prefixes.