CMKZ5257B TR

Overview

The CMKZ5257B TR is a surface mount triple isolated silicon Zener diode from Central Semiconductor Corp, packaged in an ULTRAmini SOT-363 case. It contains three independent Zener diodes with a nominal voltage of 33V and a tolerance of 5%. Each diode operates at a test current of 3.8mA, featuring a maximum dynamic impedance of 58Ω and a reverse leakage current of 0.1μA at 25V. The device supports a power dissipation of 200mW per diode and functions within a temperature range of -65°C to +150°C.

Feature Summary

• Triple isolated configuration containing three independent Zener diodes in a single compact package
• Designed for automated assembly processes in industrial and commercial applications
• High thermal stability with an operating junction temperature range extending to +150°C

Applications

• Industrial control systems requiring multiple voltage references
• Commercial equipment utilizing space-constrained circuit boards
• Entertainment electronics needing stable voltage regulation
• Computer peripheral circuits requiring isolated voltage protection

Procurement Notes

This component has been officially transitioned to End of Life status by the manufacturer. Current availability is restricted to existing stock only, with no new production scheduled. Buyers should verify inventory levels carefully before ordering, as supply is finite. Last purchase orders may be subject to specific cutoff dates defined in the discontinuation notice.

Selection Notes

Select this part when a compact solution for three isolated voltage references is required. Ensure the design accommodates the 5% voltage tolerance and the specific test current requirements. Verify that the SOT-363 footprint matches the PCB layout constraints. Consider the thermal resistance characteristics if multiple diodes are active simultaneously to prevent overheating.

Part Context

The CMKZ5257B belongs to the CMKZ5221B through CMKZ5261B series of triple isolated silicon Zener diodes. This series shares the same ULTRAmini SOT-363 package and electrical architecture, differing primarily in nominal Zener voltage values ranging from 2.4V to 47V. All devices in this family offer identical power dissipation and isolation characteristics.

Replacement Considerations

No direct replacement part numbers are listed in the official discontinuation notice. The document indicates that replacements are unavailable (N/A) and limited to stock only. Customers are advised to contact [email protected] for assistance in locating alternate sources or suitable substitutes.