Is there a pin-compatible replacement for MMSZ5252BT1G?

While several parts share the SOD-123 package, no direct pin-to-pin replacement has been verified due to differences in key electrical parameters like Zener impedance. Engineering review is required.

What risks should I check before replacing MMSZ5252BT1G?

The primary risk is a mismatch in Zener impedance (Zzt). A higher impedance in a replacement can lead to poorer voltage regulation under varying load conditions. Always verify performance in your circuit.

MMSZ5252BT1G Alternatives, Datasheet & Cross Reference | onsemi

MMSZ5252BT1G is a popular 24V, 500mW Zener diode in a SOD-123 package from onsemi. This page provides analysis of potential alternatives, focusing on electrical and mechanical compatibility.

AI replacement insight

Electrical riskmedium

Higher Zener impedance in alternatives affects regulation performance.

Package risklow

The SOD-123 package is a common standard and matches.

Sourcing risklow

Multiple manufacturers produce similar 24V SOD-123 Zener diodes.

Can it be replaced directly?

No direct drop-in replacement is confirmed. Available alternatives require engineering validation of Zener impedance.

Best replacement path

Use a functional alternative like MM1Z24, but verify circuit performance due to its higher Zener impedance.

Main risk

The main risk is degraded voltage regulation due to higher Zener impedance in available alternatives.

Recommended alternatives

A functional alternative in the same SOD-123 package with matching 24V Zener voltage and 500mW power rating.

View details

Alternative comparison matrix

Feature / factor	MMSZ5252BT1G	MM1Z24	LBZT52C24T1G	Compatibility / risk
Package	SOD-123	SOD-123	SOD-123	SOD-123 — Package matches.; LBZT52C24T1G: Package matches.
Voltage	24.0V	24.0V	24.0V	24.0V — Zener voltage matches.; LBZT52C24T1G: Zener voltage matches.
Power	500mW	500mW	500mW	500mW — Power rating matches.; LBZT52C24T1G: Power rating matches.
Zener Impedance	33 Ω	60 Ω	70 Ω	60 Ω / 70 Ω — Higher impedance may affect regulation.; LBZT52C24T1G: Significantly higher impedance will affect regulation.

Application & sourcing insights

Questions & answers

Parts like MM1Z24 are functional alternatives with the same 24V rating and SOD-123 package, but require review of Zener impedance, which is higher than the original.