Is there a pin-compatible replacement for MMSZ5245BT1G?

Yes, MMSZ15T1G is a pin-compatible alternative in the same SOD-123 package. However, it is not a direct drop-in replacement due to different electrical characteristics, specifically a higher Zener impedance.

What risks should I check before replacing MMSZ5245BT1G?

The primary risk is the change in Zener impedance. The candidate MMSZ15T1G has a higher impedance (30Ω vs 16Ω), which can affect the diode's voltage regulation performance under varying load conditions. Always verify performance in your specific application.

MMSZ5245BT1G Alternatives, Datasheet & Cross Reference | onsemi

MMSZ5245BT1G is a 15V, 500mW Zener diode in a SOD-123 package. Parametric alternatives exist, but require careful review of Zener impedance for your application.

AI replacement insight

Electrical riskmedium

Higher Zener impedance requires circuit validation.

Package risklow

Package is a matched SOD-123.

Sourcing risklow

Both target and candidate are active and from the same manufacturer.

Can it be replaced directly?

No direct drop-in replacement has been identified. The closest candidate, MMSZ15T1G, has a different Zener impedance that requires engineering review.

Best replacement path

Evaluate MMSZ15T1G, which matches key parameters but has a higher impedance that must be validated in-circuit.

Main risk

The main risk is degraded voltage regulation due to the higher Zener impedance of the alternative part.

Recommended alternatives

A parametric alternative with identical voltage, power, and package, but higher Zener impedance.

View details

Alternative comparison matrix

Feature / factor	MMSZ5245BT1G	MMSZ15T1G	Compatibility / risk
Package	SOD-123	SOD-123	SOD-123 — Form and fit are identical.
Voltage	15V	15V	15V — Nominal Zener voltage is identical.
Power	500mW	500mW	500mW — Power dissipation rating is identical.
Impedance	16Ω	30Ω	30Ω — Higher impedance may affect regulation.
Lifecycle	Active	Active	Active — Both parts are in active production.

Application & sourcing insights

Questions & answers

MMSZ15T1G is a strong parametric alternative with the same voltage, power, and package, but its higher Zener impedance (30Ω vs 16Ω) must be evaluated for your circuit's stability and regulation needs.