MOSFET Rds(on) Calculator
Calculate on-state resistance at operating temperature and gate voltage conditions.
Input Parameters
mOhm
C
V
V
%/C
Rds(on) at Operating Conditions
68.8 mOhm
Temp Factor
1.38x
Vgs Factor
1.00x
Max Current (1W)
3.81 A
Rds at Tj only
68.8 mOhm
Rds(on) vs Temperature
50C: 56.3 mOhm75C: 62.5 mOhm100C: 68.8 mOhm125C: 75.0 mOhm
Rds(on) Theory
Rds(on) increases significantly with temperature due to reduced carrier mobility. The positive temperature coefficient helps with current sharing in parallel MOSFETs but must be accounted for in thermal design.
Rds(Tj) = Rds(25C) x (1 + alpha x (Tj - 25))
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.