Vout = Vin × (R2 / (R1 + R2)) - leave one field empty to solve
Nearest standard resistor value to a calculated target - works for any E-series part
Best standard resistor pairs for a target Vout = Vin × R2 / (R1 + R2)
R = (Vs - Vf) / If, rounded up to E24
Time for a capacitor charging toward Vs to cross Vth: t = -RC × ln(1 - Vth/Vs)
Copper wire resistance, one-way voltage drop, and rule-of-thumb ampacity (~4 A/mm² bundled, ~10 A/mm² in free air)
Rmin from VOL sink current (0.4 V spec), Rmax from rise time: tr = 0.8473 × R × Cb. Standard mode 1000 ns, fast mode 300 ns
C1 = C2 = 2 × (CL - Cstray). CL from the crystal datasheet; stray is typically 3-5 pF of pin + trace capacitance
LSB = Vref / 2^N, ideal SNR = 6.02N + 1.76 dB (full-scale sine)
R = R25 × exp(β × (1/T - 1/298.15)) - fill T or R, leave the other empty to solve
P = I² × Rds(on), Tj = Ta + (P × θja)
Psw = Qg × Vgs × fsw, Pcond = I² × Rds(on)
GBP = Gain × Bandwidth - leave one field empty to solve
fc = 1 / (2πRC) - leave one field empty to solve
Unity-gain, equal-R design: C1 = 4Q² × C2, R1 = R2 = 1/(4πQ × fc × C2). Q = 0.707 for Butterworth
Sine-wave conversions at a given impedance: P = Vrms²/Z, Vpp = 2√2 × Vrms. Enter one value, leave the rest empty
Estimates runtime based on capacity, sleep power, and TX events
L = (Vout × (Vin - Vout)) / (Vin × fsw × ΔI)
D = 1 - Vin/Vout, L = (Vin × D) / (fsw × ΔIL). Note the inductor carries the input current: IL = Iout / (1 - D)
ΔVout = ΔIL × ESR + ΔIL / (8 × fsw × C). ΔIL from the inductor sizing calc above
P = (Vin - Vout) × I, Tj = Ta + P × θja - the 'do I need a heatsink' check
P = I²rms × ESR, estimates temperature rise
Measure the switch-node ring frequency (f1), add a test cap and measure again (f2). R = √(Lpar/Cpar), Csnub ≈ 3 × Cpar
Minimum width for a current and allowed temperature rise: I = k × ΔT^0.44 × A^0.725. Resistance at 20 °C for the computed width
Calculates characteristic impedance for microstrip or stripline
Edge-coupled pair (IPC-2141 approximation) - for USB, RS-485, Ethernet etc.
Barrel treated as an internal IPC-2221 conductor. L ≈ 0.2 × h × (ln(4h/d) + 1) nH