CMKZ5237B TR

Overview

The CMKZ5237B TR is a surface mount triple isolated silicon Zener diode from the Central Semiconductor CMKZ5221B series, packaged in an ULTRAmini SOT-363 case. It contains three independent Zener diodes with a nominal voltage of 8.2 V and a tolerance of ±5%. The device operates within a junction temperature range of -65°C to +150°C and has a power dissipation rating of 200 mW per diode at 25°C ambient temperature. Electrical characteristics include a maximum dynamic impedance (ZZT) of 8.0 Ω and a maximum reverse current (IR) of 3.0 μA at VR = 6.5 V.

Feature Summary

• Triple isolated silicon Zener diodes integrated into a single compact surface mount package
• Designed for industrial, commercial, entertainment, and computer applications
• Provides independent voltage regulation for multiple circuits within limited board space

Applications

• Industrial control systems requiring multi-channel voltage reference
• Commercial equipment utilizing compact power management solutions
• Computer hardware needing isolated voltage regulation

Procurement Notes

This component is classified as End of Life (EOL). No new production is available; only existing stock may be sourced. Verify availability through authorized distributors or inventory holders before design finalization. Last purchase orders were accepted six months after the EOL notice date, with final shipments occurring twelve months post-notice. Confirm lead times and remaining quantities directly with suppliers.

Selection Notes

Select this part when a triple isolated Zener configuration is required in an SOT-363 footprint. Ensure the 8.2 V nominal voltage and ±5% tolerance meet circuit specifications. Verify thermal constraints, as the 200 mW dissipation rating applies at 25°C ambient. Consider that the device is discontinued and substitute components may require layout adjustments.

Part Context

The CMKZ5237B belongs to the CMKZ5221B series, which spans Zener voltages from 2.4 V to 49.35 V. All devices in this series share the same SOT-363 package and triple isolation architecture. The series was designed to replace discrete dual or single Zener setups in space-constrained designs. This specific variant provides the 8.2 V option within the broader product family.

Replacement Considerations

No direct replacement part numbers are listed by Central Semiconductor for the CMKZ5237B. The manufacturer indicates that no replacements are available and advises contacting [email protected] for alternate source assistance. Designers must evaluate third-party equivalents independently.