
Protek Devices
An excellent upgrade with higher power rating and lower clamping voltage in the same package.
Finding a substitute for the SDT23C24L02 TVS diode involves matching its 24V standoff voltage, 350W power rating, and bidirectional SOT-23 package. Several alternatives exist with similar or improved characteristics.
Some alternatives have lower power ratings, which may not be sufficient for the application's transient events.
All viable candidates use the same SOT-23 package, but pinout must be verified to ensure drop-in compatibility.
NUP2105L from UMW is a strong parametric match with the same voltage and power ratings. However, its pin-to-pin compatibility must be confirmed by checking the datasheet.
PSOT24C-LF-T7 from Protek Devices offers an upgrade in power rating (500W) and clamping voltage, making it a robust alternative.
The main risk is selecting a part with a lower peak power rating or an incorrect configuration (e.g., unidirectional instead of bidirectional), which could lead to inadequate circuit protection.

Protek Devices
An excellent upgrade with higher power rating and lower clamping voltage in the same package.
| Feature / factor | SDT23C24L02 | PSOT24C-LF-T7 | NUP2105L | PESD2CANFD24V-K | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23 | SOT-23 | SOT-23 | SOT-23 | SOT-23 — Package matches.; NUP2105L: Package matches.; PESD2CANFD24V-K: Package matches. |
| Voltage | 24V | 24V | 24V | 24V | 24V — Reverse standoff voltage matches.; NUP2105L: Reverse standoff voltage matches.; PESD2CANFD24V-K: Reverse standoff voltage matches. |
| Power | 350W | 500W | 350W | 280W | 500W / 350W / 280W — Higher peak power provides more robust protection.; NUP2105L: Peak pulse power matches.; PESD2CANFD24V-K: Lower peak power rating is a downgrade. |
| Polarity Or Type | Bidirectional, 2-Ch | Bidirectional | Bidirectional, 2-Ch | Bidirectional, 2-Ch | Bidirectional / Bidirectional, 2-Ch — Functionally equivalent bidirectional protection.; NUP2105L: Functionally equivalent bidirectional protection.; PESD2CANFD24V-K: Functionally equivalent bidirectional protection. |
| Clamping Voltage | 52V | 49V | 44V | 48V | 49V / 44V / 48V — Lower clamping voltage provides better protection.; NUP2105L: Lower clamping voltage provides better protection.; PESD2CANFD24V-K: Lower clamping voltage provides better protection. |
Verified drop-in options for SDT23C24L02 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.