MMSZ5257BT1G

Single Zener Diodes Overview

The MMSZ5257BT1G is a single-channel Zener voltage regulator diode manufactured by onsemi, housed in an SOD-123 surface-mount package. It features a nominal Zener voltage of 33 V with a ±5% tolerance and a maximum power dissipation rating of 500 mW. The device operates within a junction temperature range of -55°C to +150°C. Key electrical specifications include a test current (IZT) of 3.8 mA, a maximum Zener impedance (ZZT) of 58 Ω at the test current, and a maximum reverse leakage current (IR) of 100 nA at a reverse voltage of 25 V.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation for general-purpose applications using a compact SOD-123 surface-mount footprint.
• Designed for optimal automated board assembly processes with void-free, transfer-molded thermosetting plastic construction.
• Offers high electrostatic discharge protection capability rated at Class 3 (> 16 kV) per the Human Body Model.

Single Zener Diodes Applications

• General purpose voltage regulation circuits
• Medium current signal conditioning
• High density surface mount board designs

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix 'BT1G' corresponds to the required 5% tolerance and tape-and-reel packaging configuration. Confirm that the SOD-123 case dimensions align with the target PCB footprint requirements. Ensure compliance with RoHS standards and lead-free manufacturing specifications as indicated by the product marking. Validate thermal equilibrium conditions during testing to ensure accurate Zener voltage measurements.

Single Zener Diodes Selection Notes

Select this component when a 33 V reference or regulation point is required in a space-constrained design. The 500 mW power rating supports moderate current loads while maintaining thermal stability. Consider the 58 Ω dynamic impedance for noise sensitivity in the application circuit. The wide operating temperature range ensures reliability across diverse environmental conditions without derating below 75°C on standard FR-4 boards.

Single Zener Diodes Part Context

This device belongs to the MMSZ52xxxT1G series of Zener diodes offered by onsemi. The series provides a convenient alternative to leadless packages, covering a wide reverse voltage range from 2.4 V to 110 V. All devices in this family share the same SOD-123 mechanical outline and are designed for high-density surface mount applications.

Single Zener Diodes Replacement Considerations

Cross-reference with other MMSZ5257 variants such as MMSZ5257B or MMSZ5257BT3G if different reel quantities are needed. Verify that any substitute maintains the same 33 V nominal voltage and 500 mW power dissipation rating. Ensure the replacement part utilizes the SOD-123 package to fit existing footprints.