Is there a pin-compatible replacement for MMSZ5246B?

Yes, several Zener diodes like MMSZ5247B use the same 2-pin SOD-123 package. However, their electrical parameters like Zener voltage and power rating differ, so they are not drop-in replacements and require careful review.

What risks should I check before replacing MMSZ5246B?

When substituting MMSZ5246B, the main risks are Zener voltage mismatch, which affects regulation accuracy, and lower power dissipation, which can lead to overheating and failure. Always verify the candidate's datasheet against your circuit's requirements.

MMSZ5246B Alternatives, Datasheet & Cross Reference | onsemi

MMSZ5246B is a 16V, 500mW Zener diode in a common SOD-123 package. Finding a direct, drop-in replacement requires matching the Zener voltage, power rating, and package.

AI replacement insight

Electrical riskhigh

Voltage and power mismatches are common in potential candidates.

Package risklow

The SOD-123 package is standard and widely available.

Can it be replaced directly?

No direct, fully equivalent replacement was identified. All candidates have different Zener voltages or lower power ratings, requiring engineering validation.

Best replacement path

The best path is to find a Zener diode with exactly 16V Vz, >=0.5W power, in a SOD-123 package. MMSZ5247B is a close but imperfect option.

Main risk

The primary risk is using a part with the wrong Zener voltage, which will fail to regulate at the intended 16V.

Recommended alternatives

A Zener diode in the same SOD-123 package, but with a 17V rating and lower power handling. Requires review.

View details

Alternative comparison matrix

Feature / factor	MMSZ5246B	MMSZ5247B	MMSZ5248B	Compatibility / risk
Package	SOD-123	SOD-123	SOD-123	SOD-123 — Package matches, ensuring form factor compatibility.; MMSZ5248B: Package matches, ensuring form factor compatibility.
Voltage	16.0V	17.0V	18.0V	17.0V / 18.0V — Zener voltage is slightly higher, may be acceptable in some circuits.; MMSZ5248B: Zener voltage is higher, which will change the regulation point.
Power	0.5W	0.35W	0.35W	0.35W — Power rating is lower, requires thermal analysis.; MMSZ5248B: Power rating is lower, increasing risk of thermal failure.

Application & sourcing insights

Questions & answers

Finding a direct replacement for the MMSZ5246B requires a 16V, 500mW Zener in a SOD-123 package. While no perfect match was found, MMSZ5247B is a potential option if a 17V rating is acceptable, but it has a lower power rating and requires circuit validation.