Alternative Part
N-Channel 100 V 97A (Tc) 221W (Tc) Through Hole TO-220AB

Substitution Feasibility Conclusion
In most medium-voltage switching applications, the IRF100B202 can serve as a drop‑in replacement for the STP100N8F6 with improved performance, provided the drive circuit can deliver sufficient current. Reverse substitution (i.e., using the IRF100B202 in higher‑voltage or higher‑power‑dissipation scenarios) is generally viable. Forward substitution (i.e., using the STP100N8F6 in lower‑voltage or high‑frequency switching applications) requires careful evaluation.
Comparison Points
1. Voltage & On‑Resistance (Vdss & Rds(on)):
The IRF100B202 offers a higher rated voltage (100 V vs. 80 V) and exhibits a lower on‑resistance (8.6 mΩ vs. 9 mΩ) at a higher test current (58 A vs. 50 A). In applications below 80 V, the IRF100B202 provides greater voltage margin and lower conduction loss, potentially yielding slightly higher efficiency.
2. Switching Characteristics (Qg & Ciss):
The total gate charge (Qg) of the IRF100B202 is about 16% higher (116 nC vs. 100 nC), while its input capacitance (Ciss) is roughly 25% lower (4476 pF vs. 5955 pF—note the different test voltages). This suggests the IRF100B202 may have a larger Miller‑plateau charge, demanding higher peak drive current during switching. Consequently, switching speed could be slightly slower and switching losses may increase. However, the reduced Ciss helps lower gate‑drive losses at higher frequencies.
3. Thermal Performance (Power Dissipation):
The maximum power dissipation of the IRF100B202 (221 W) is significantly higher than that of the STP100N8F6 (176 W), which typically indicates a lower junction‑to‑case thermal resistance (RthJC). Under identical dissipation and cooling conditions, the IRF100B202 will operate at a lower junction temperature, or alternatively, can handle higher continuous current at the same junction temperature, offering better system thermal reliability.
4. Current Capability (Id) & Test Conditions:
Although the rated continuous currents are similar (97 A vs. 100 A), the IRF100B202’s rating is based on a lower on‑resistance and superior thermal capability. Combined with its higher power‑dissipation rating, the IRF100B202 is likely to deliver more robust current‑handling performance in real‑world applications, especially in thermally constrained environments.
Analysis ID: 2873-078F000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com


