MMSZ5247B
Fairchild Semiconductor
Needs validationmedium risk
A parametric alternative in a SOD-123 package with a slightly higher Zener voltage of 17V.
Best Alternatives to MMSZ4703-E3-08
MMSZ4703-E3-08 is a 16V, 500mW Zener diode in a compact SOD-123 package. Finding a substitute requires closely matching the Zener voltage, power rating, and package.
AI replacement insight
Electrical riskmedium
Zener voltage and leakage current differ.
Package risklow
SOD-123 is standard, but variants exist.
Can it be replaced directly?
No verified direct, drop-in replacements for MMSZ4703-E3-08 have been identified. All potential candidates require engineering review.
Best replacement path
Evaluate MMSZ5247B, which has the closest Zener voltage (17V vs 16V). Engineers must verify if this slight voltage increase is acceptable.
Main risk
The primary risk is the mismatch in nominal Zener voltage, which can shift the circuit's voltage regulation or clamping level.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | MMSZ4703-E3-08 | MMSZ5247B | MMSZ5248B | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOD-123 | SOD-123 | SOD-123 / SOD-123F | SOD-123 / SOD-123 / SOD-123F — Package matches.; MMSZ5248B: Package may be SOD-123F, which is not compatible. | |
| Voltage | 16V | 17V | 18V | 17V / 18V — Slightly higher Zener voltage.; MMSZ5248B: Higher Zener voltage. | |
| Power | 500mW | 500mW | 350mW / 500mW | 500mW / 350mW / 500mW — Data conflicts (350mW vs 500mW). Assuming 500mW from PANJIT datasheet.; MMSZ5248B: Conflicting data, may be a downgrade. | |
| Current | 50nA | 100nA | - | 100nA — Higher reverse leakage current. |
Application & sourcing insights
Questions & answers
MMSZ5247B is a potential alternative with a close Zener voltage of 17V, but requires circuit validation due to parametric differences.