1N5388B/TR8

Overview

The Microsemi Corporation 1N5388B/TR8 is a JEDEC registered silicon 5.0-watt Zener diode in the axial-leaded T-18 package, featuring a nominal voltage of 200 V with ±5% tolerance. It operates within a temperature range of -65°C to +150°C and includes a TR suffix for tape-and-reel packaging. Key electrical characteristics include a maximum dynamic impedance of 480 ohms at 5.0 mA test current, a maximum reverse leakage current of 500 nA at 144 V, and a maximum regulator current of 23.6 mA. The device withstands high surge stresses up to 1850 A (8.3 ms pulse) and exhibits minimal voltage changes versus current.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole integration
• Withstands high surge stresses without damage
• Minimal changes of voltage versus current as specified by voltage regulation

Applications

• Voltage regulation circuits requiring high power dissipation
• Overvoltage protection for industrial equipment
• Power supply input transient suppression

Procurement Notes

Verify the component's end-of-life status, as official records indicate this part has been discontinued. Confirm that the specific 'TR' suffix matches the required tape-and-reel packaging format rather than standard bulk or cut-tape options. Ensure compatibility with existing thermal management designs due to the 5-watt power rating requirements.

Selection Notes

Select this component when a high-voltage 200 V Zener reference is needed with tight ±5% tolerance. Consider the T-18 package dimensions and lead length requirements for adequate heat sinking. Evaluate the 480 ohm dynamic impedance against circuit sensitivity requirements, as higher voltage models exhibit increased impedance compared to lower voltage variants.

Part Context

This device belongs to the 1N5333B through 1N5388B series of JEDEC registered silicon Zener diodes manufactured by Microsemi Corporation. The series covers a wide voltage selection from 3.3 V to 200 V, all sharing a common 5.0-watt power dissipation capability and plastic encapsulated construction. The B suffix specifically denotes the standard ±5% voltage tolerance classification within this family.

Replacement Considerations

RoHS-compliant equivalents are available by adding the e3 suffix to the base part number, resulting in the 1N5388BE3 variant. Surface mount alternatives exist within the SMBJ5333 to SMBJ5388B or SMBG5333B to SMBG5388B families.