MMBZ5221B

Single Zener Diodes Overview

The onsemi MMBZ5221B is a single Zener voltage regulator diode housed in an SOT-23 surface-mount package. It provides a nominal Zener voltage of 2.4 V with a tolerance of ±5%. The device features a maximum power dissipation of 350 mW and operates within a junction temperature range up to +150 °C. Electrical characteristics include a maximum Zener impedance of 30 Ω at a test current of 20 mA, a knee impedance of 20 Ω at 0.25 mA, and a maximum reverse leakage current of 1,200 µA at 1.0 V.

Single Zener Diodes Feature Summary

• Provides precise voltage regulation for low-voltage applications
• Designed for automated assembly processes using a compact SOT-23 package
• Utilizes planar die construction for reliability

Single Zener Diodes Applications

• Voltage regulation in cellular phones
• Protection circuits in handheld portable devices
• Voltage reference applications on high-density PC boards

Single Zener Diodes Procurement Notes

Verify the manufacturer origin, as this specific part number was originally produced by Fairchild Semiconductor. Confirm RoHS compliance status and check for equivalent sourcing from onsemi or other authorized distributors if original stock is unavailable. Ensure the component matches the required SOT-23 footprint and electrical specifications for your design.

Single Zener Diodes Selection Notes

Select this component when a stable 2.4 V reference is required in space-constrained designs. The SOT-23 package allows for high-density board layouts. Consider the 350 mW power rating and thermal management requirements for your specific application environment. Verify that the 5% voltage tolerance meets the circuit's precision needs.

Single Zener Diodes Part Context

This device belongs to the MMBZ5221B-MMBZ5257B series of Zener diodes. These components are designed to offer voltage regulation capabilities in a small plastic surface-mount package. The series covers a wide range of Zener voltages from 2.4 V to 91 V, allowing designers to choose appropriate voltage levels for various circuit protection and regulation tasks.

Single Zener Diodes Replacement Considerations

Equivalent parts include MMBZ5221BLT1G and MMBZ5221BT-13. Verify pinout compatibility and ensure the replacement maintains the same 2.4 V Zener voltage and 350 mW power dissipation rating.