SPD9103W
Leiditech
Needs validationlow risk
Pin-compatible upgrade with a significantly higher power rating (350W vs 200W).
Best Alternatives to WS03DLC-B-ES
WS03DLC-B-ES is a 3.3V bi-directional TVS diode in a SOD-323 package. Several strong, pin-compatible alternatives with upgraded power ratings are available, offering enhanced circuit protection.
AI replacement insight
Electrical risklow
Key parameters match or improve, but Ipp must be verified from the datasheet.
Package risklow
Package and pin count are identical.
Can it be replaced directly?
Yes, SPD9103W and TPGC03C are strong candidates for direct replacement, matching package, voltage, and polarity while offering improved power ratings.
Best replacement path
Upgrade to SPD9103W or TPGC03C for higher power handling and better protection.
Main risk
The primary risk is the lack of an explicitly matched Peak Pulse Current (Ipp) value in catalog data, which requires datasheet verification.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | WS03DLC-B-ES | SPD9103W | TPGC03C | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOD-323 | SOD-323 | SOD-323 | SOD-323 — Form and fit match.; TPGC03C: Form and fit match. | |
| Voltage | 3.3V | 3.3V | 3.3V | 3.3V — Working voltage matches.; TPGC03C: Working voltage matches. | |
| Power | 200W | 350W | 260W | 350W / 260W — Significantly higher power rating provides more robustness.; TPGC03C: Higher power rating provides more robustness. | |
| Capacitance | 1.2pF | 1.0pF | 1.0pF | 1.0pF — Lower capacitance is better for high-speed lines.; TPGC03C: Lower capacitance is better for high-speed lines. | |
| Clamping Voltage | 9V @ 1A | - | 5V @ 1A | 5V @ 1A — Lower clamping voltage offers better protection. |
Application & sourcing insights
Questions & answers
SPD9103W by Leiditech is an excellent alternative, offering the same 3.3V working voltage and SOD-323 package with a higher peak power rating (350W vs 200W) for improved robustness.