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Slew rate measures how fast a signal's voltage can change — a key limiting spec for op-amps, DACs, and other circuits, since exceeding it distorts the output. This calculator solves for whichever value — voltage change, time change, or slew rate — is missing.
How it works
Enter any 2 of the 3 values (voltage change, time change in microseconds, or slew rate in V/µs) and leave the one you want to solve for blank. The calculator applies SR = ΔV/Δt.
- Enter voltage change, ΔV (V) — leave blank to solve for this.
- Enter time change, Δt (µs) — leave blank to solve for this.
- Enter slew rate (V/µs) — leave blank to solve for this.
- Click Calculate to see your results.
Examples
A typical op-amp slew rate
A signal changing by 5V in 1 µs has a slew rate of 5 V/µs — a common spec range for general-purpose op-amps.
Who should use it
- Op-amp and analog circuit design coursework.
- Verifying a component's slew rate is adequate for a target signal.
Industry applications
- Analog and mixed-signal circuit design
- Audio engineering and high-speed electronics
Advantages
- Solves for any of the three variables, not just forward slew-rate calculation.
- Directly usable with datasheet specifications.
Limitations
- Doesn't account for how slew rate interacts with a specific circuit's full signal chain — it's one design factor among several.
Common mistakes to avoid
- Assuming a circuit can always reproduce a signal accurately regardless of frequency and amplitude — high-amplitude, high-frequency signals need proportionally higher slew rate.
- Mixing up microseconds with other time units when entering the time-change value.
Best practices
- Check that your component's rated slew rate comfortably exceeds what your fastest, largest expected signal transition actually requires.
- Remember slew-rate limiting is a real, audible/visible form of distortion — not just a theoretical spec number.
Tips
- For a sine wave, the maximum required slew rate is 2π × frequency × peak amplitude — use this to check whether a component's rated slew rate is adequate for your specific signal.