Is there a pin-compatible replacement for MMSZ5242BT1G?

No pin-compatible replacement with the same 12V Zener voltage was identified. While parts in the same SOD-123 package exist, their electrical parameters differ.

What risks should I check before replacing MMSZ5242BT1G?

Verify the Zener voltage (Vz), power dissipation, and reverse leakage current. A mismatch in Vz is the most critical risk and will affect circuit performance.

MMSZ5242BT1G Alternatives, Datasheet & Cross Reference | onsemi

MMSZ5242BT1G is a 12V, 500mW Zener diode in a SOD-123 package from onsemi. Finding a direct replacement requires matching the Zener voltage, power rating, and package.

AI replacement insight

Electrical riskhigh

Zener voltage mismatch is a critical functional difference.

Package risklow

Alternatives in the same SOD-123 package are available.

Can it be replaced directly?

No direct pin-to-pin replacement was found. Available alternatives have different Zener voltages, which will impact circuit performance and require redesign.

Best replacement path

functional_alternate

Main risk

The primary risk is a mismatch in Zener voltage, which can lead to improper voltage regulation or circuit damage.

Recommended alternatives

A functional alternative in the same SOD-123 package and power rating, but with a 15V Zener voltage.

View details

Alternative comparison matrix

Feature / factor	MMSZ5242BT1G	MMSZ15T1G	Compatibility / risk
Package	SOD-123	SOD-123	SOD-123 — Package matches, enabling form-fit compatibility.
Voltage	12.0V	15.0V	15.0V — Higher Zener voltage requires circuit validation.
Power	0.5W	0.5W	0.5W — Power rating is identical.
Pinout	2	2	2 — Pin count matches based on package type.

Application & sourcing insights

Questions & answers

No direct drop-in was found. MMSZ15T1G is a potential functional alternative with the same package and power but a higher 15V Zener voltage, requiring circuit validation.