Part Overview & Baseline Specs

Part identity and intended applications

The component is a shielded SMD wirewound power inductor designed for DC–DC filters, power rails, and EMI suppression. Sampled units exhibit nominal mid-hundred microhenry inductance and low-to-moderate DCR suitable for low-current converters. Using 784778471 in small buck or post-regulator filters is typical when board height and shielding are constrained.

Datasheet baseline specs to record before testing

Capture datasheet items prior to test. Required fields include nominal inductance, tolerance, DCR, rated/saturation current, SRF, thermal/operating range, footprint, and mount notes. Record acceptable pass/fail bands (e.g., ±10% inductance, DCR tolerance) so measured deviations are actionable during validation.

Measured Electrical Performance

Inductance vs frequency and tolerance profile

Characterize inductance across frequency to detect roll-off and resonance. Perform LCR sweeps at multiple frequencies with calibrated fixture, present results as frequency sweep and a sample variance boxplot. Flag anomalies when inductance deviates beyond ±10% or SRF occurs within your operating band.

Saturation, Thermal and Reliability

Saturation current and thermal-rise behavior

Determine usable current before inductance loss and excessive heating. Bias-sweep until inductance drops 10–30% while monitoring thermocouples; report saturation point, thermal resistance, and steady-state temperature at rated current. Adopt conservative derating (e.g., 60–80% of measured saturation) for continuous operation to ensure margin.

Lifecycle and stress test outcomes

Validate long-term reliability under mechanical and environmental stress. Run thermal cycling, humidity soak, vibration, and reflow profiles; capture post-stress shifts in inductance/DCR and any mechanical failures. Failures like insulation breakdown or solder cracks indicate either process changes or alternative components are required.