Original Part
Alternative Part
1. SMF33A-T13 Substitution Conclusion
The SMF33A-T13 can directly replace the original SMF33A, as all key parameters are identical: reverse stand-off voltage (33V), minimum breakdown voltage (36.7V), maximum clamping voltage (53.3V), peak pulse current (3.8A), and peak pulse power (200W). The package is also the same SOD-123F. There is no difference in electrical characteristics, surge protection capability, or mounting compatibility. The only change is the manufacturer from Slkormicro to Littelfuse, making this a drop-in replacement with no circuit design adjustments required.
2. SMF4L33A Substitution Conclusion
The SMF4L33A shares the same voltage ratings (33V/53.3V) but offers a higher peak pulse current of 7.5A and an increased peak pulse power of 400W, while maintaining the SOD-123F package. This device can withstand higher transient energy and provides greater overvoltage protection margin, making it suitable for more demanding surge environments. Given the identical voltage characteristics and package compatibility, it can serve as a replacement for the original part. However, designers should note that its higher power capability may result in slightly different dynamic response. It is recommended to verify its clamping performance in the actual circuit before final substitution.
Analysis ID: 4981-5200000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com