MMBZ5231B

Single Zener Diodes Overview

The onsemi MMBZ5231B is a single silicon unidirectional Zener voltage regulator diode housed in an SOT-23 surface-mount package. It provides a nominal Zener voltage of 5.1 V with a tolerance of ±5%. The device supports a maximum power dissipation of 0.35 W and operates within a temperature range of -65°C to +150°C. Key electrical characteristics include a maximum reverse leakage current of 5 µA, a maximum Zener impedance of 17 Ω at a test current of 20 mA, and a typical voltage temperature coefficient of 0.03%/°C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation for sensitive circuitry using a single unidirectional Zener junction.
• Designed for high-density applications with a compact SOT-23 surface-mount footprint.
• Capable of operating reliably across extended industrial temperature ranges.

Single Zener Diodes Applications

• Voltage reference circuits requiring precise 5.1 V levels
• Overvoltage protection for low-voltage signal lines
• Clamping applications in portable electronic devices

Single Zener Diodes Procurement Notes

Verify the manufacturer source carefully as this part number is primarily associated with Panjit International and Rectron Semiconductor. Confirm that the specific unit supplied matches the required 0.35 W power rating and SOT-23 package dimensions. Ensure compliance with RoHS standards if applicable to your assembly process. Cross-reference datasheets from different suppliers to confirm pinout consistency and thermal performance specifications before integration.

Single Zener Diodes Selection Notes

Select this component when a standard 5.1 V regulation point is needed in space-constrained designs. The SOT-23 package facilitates automated surface-mount assembly. Consider the 0.35 W power dissipation limit during thermal design. Verify that the 17 Ω impedance meets the noise and stability requirements of the target application compared to higher-power alternatives.

Single Zener Diodes Part Context

This component belongs to the broader category of Zener voltage regulators used for biasing and protection. While similar in function to other 5.1 V diodes like the MMBZ5231BLT1G, the MMBZ5231B specifically denotes the 0.35 W variant often manufactured by Panjit or Rectron. It serves as a fundamental discrete semiconductor element in analog and mixed-signal PCB layouts.

Single Zener Diodes Replacement Considerations

MMBZ5231BLT1G (onsemi) offers identical electrical parameters in the same SOT-23 package. MMSZ5231BT3 (onsemi) provides a 500 mW rating in an SOD-123 package, requiring layout adjustment. MMBZ5231ELT1G (onsemi) is a 225 mW alternative in the same package form factor.