SiC Schottky barrier diodes have essentially no reverse-recovery charge. Used in PFC boost, fast-charge supplies and PV inverters for freewheeling/rectification, they cut high-frequency switching loss substantially.
Reading the Key Parameters
- VRRM: 650V class in the catalog — covering mainstream single-phase mains rectification and PFC bus needs.
- IF (average forward current): roughly 4A–10A; pick by output power and topology current stress, with thermal derating margin.
- Qc (total capacitive charge): about 9.5nC–28nC. When replacing silicon FRDs this is where the switching-loss gap comes from — lower is better at high frequency.
- C (junction capacitance) & Ec (avalanche energy): capacitance of roughly 185pF–550pF affects resonance and EMI; Ec of about 2.4mJ–7mJ reflects surge and abnormal-condition ruggedness.
- Tj & package: 175°C junction class in a TO252-2L SMD package — plan copper-pour thermal design accordingly.
Three Steps
- Confirm the 650V class covers your bus voltage with margin (typically 20%+);
- Pick the IF class by current stress and derating;
- Compare Qc and capacitance where switching loss dominates; check Ec where surges are frequent.
Common Pitfalls
- Judging SiC SBDs by forward-drop habits from silicon diodes — the win is on the switching side, not conduction;
- Sizing current by average only, without start-up surge and fault conditions;
- Skimping on copper pour for the SMD package and running the junction far hotter than estimated.
Filter by VRRM, IF and Qc in the online parametric tool; for fit questions, submit a part-number inquiry.