MMSZ5257ET1

Single Zener Diodes Overview

The onsemi MMSZ5257ET1G is a single Zener voltage regulator diode housed in an SOD-123 surface-mount package. It provides a nominal Zener voltage of 33 V with a ±5% tolerance, tested at a current of 3.8 mA. The device supports a maximum power dissipation of 500 mW and features a peak surge power rating of 225 W (8 x 20 µs). Electrical characteristics include a maximum dynamic impedance of 58 Ω and a reverse leakage current of 100 nA at 25 V. Operating temperatures range from -55 °C to +150 °C.

Single Zener Diodes Feature Summary

• Designed for optimal automated board assembly within a compact SOD-123 plastic case.
• Provides high-density general-purpose voltage regulation capabilities.
• Features robust ESD protection rated at Class 3 (> 16 kV) per the Human Body Model.

Single Zener Diodes Applications

• General purpose voltage regulation circuits
• Medium current applications requiring stable reference voltages
• High-density surface mount electronic assemblies

Single Zener Diodes Procurement Notes

Verify that the specific part number suffix matches the required automotive or commercial qualification level. Confirm RoHS compliance status and packaging format requirements prior to ordering. Ensure design parameters align with the manufacturer's electrical specifications for thermal and voltage limits.

Single Zener Diodes Selection Notes

Select this component when a 33 V reference is needed in a small surface-mount footprint. Consider the SZMMSZ5257ET1G variant if AEC-Q101 automotive qualification and PPAP capability are mandatory for the application environment.

Single Zener Diodes Part Context

This device belongs to the MMSZ52xxET1G series of 500 mW Zener diodes. It serves as a direct alternative to leadless 34-package styles while offering similar performance metrics in a standardized SOD-123 outline suitable for modern PCB layouts.

Single Zener Diodes Replacement Considerations

SZMMSZ5257ET1G

Single Zener Diodes FAQ

What is the ESD protection rating for this device?

The device offers an ESD rating of Class 3, exceeding 16 kV according to the Human Body Model standard.

How is polarity indicated on the component?

Polarity is identified by a cathode band printed on the surface of the plastic case.