1N5387A/TR12

Overview

The Microsemi 1N5387A/TR12 is a silicon Zener diode with an 190V nominal voltage and ±10% tolerance. It operates in a T-18 axial lead package, dissipating up to 5W at 25°C. The device features a maximum reverse current of 0.5µA at 137V and a dynamic impedance of 450Ω at 5mA test current. It withstands surge currents up to 1850A and functions within a -65°C to +150°C temperature range. The TR12 suffix indicates tape and reel packaging compliant with EIA-296 standards.

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 versatile integration

Applications

• Voltage regulation circuits requiring 190V reference
• Power supply protection against overvoltage conditions
• General purpose clipping and clamping applications

Procurement Notes

Verify the specific suffix configuration matches project requirements. Confirm that the TR12 tape and reel format aligns with automated assembly equipment specifications. Ensure compliance with RoHS directives if applicable, noting that standard versions may contain lead. Cross-reference thermal derating curves for final PCB layout planning to maintain safe operating temperatures under load.

Selection Notes

Select this component when a precise 190V Zener reference is required with moderate tolerance. Consider the 5W power rating and thermal resistance characteristics for heat dissipation needs. Evaluate the axial lead form factor against available board space and mounting constraints. Compare dynamic impedance values against circuit sensitivity requirements for noise performance.

Part Context

This part belongs to the JEDEC registered 1N5333B through 1N5388B series of 5-watt silicon Zener diodes. The series offers a wide voltage selection from 3.3V to 200V with various tolerance options. Microsemi provides military screening equivalents and surface mount variants within this family for diverse application needs.

Replacement Considerations

Equivalent parts include other manufacturers' 1N5387A devices or the 1N5387B variant with tighter tolerance. Surface mount alternatives like SMBJ5387 are available for compact designs. Verify pinout compatibility and thermal performance when substituting.