MMSZ5239BT1G
onsemi
Needs validationmedium risk
A functional alternative in the same package with a slightly higher Zener voltage of 9.1V.
Best Alternatives to MMSZ5237BT1G
MMSZ5237BT1G is an 8.2V, 500mW Zener diode in a SOD-123 package from onsemi. Finding a replacement requires matching the package, power, and critically, the Zener voltage.
AI replacement insight
Electrical riskmedium
Zener voltage mismatch requires circuit validation.
Package risklow
Candidates share the same SOD-123 package.
Can it be replaced directly?
No direct, drop-in replacement with an identical Zener voltage was identified. The closest options require engineering review due to different voltages.
Best replacement path
Use MMSZ5239BT1G as a functional alternative, verifying the impact of its 9.1V Zener voltage on your circuit's performance.
Main risk
The Zener voltage difference is the main risk, potentially affecting voltage regulation accuracy and downstream component safety.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | MMSZ5237BT1G | MMSZ5239BT1G | MMSZ5240BT1G | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Voltage | 8.2 V | 9.1 V | 10.0 V | 9.1 V / 10.0 V — Candidate voltage is ~11% higher.; MMSZ5240BT1G: Candidate voltage is ~22% higher. | |
| Power | 0.5 W | 0.5 W | 0.5 W | 0.5 W — matched; MMSZ5240BT1G: matched | |
| Package | SOD-123 | SOD-123 | SOD-123 | SOD-123 — matched; MMSZ5240BT1G: matched | |
| Manufacturer | onsemi | onsemi | - | onsemi — matched |
Application & sourcing insights
Questions & answers
MMSZ5239BT1G is a strong functional alternative. It shares the same package and power rating but has a slightly higher Zener voltage of 9.1V.