SMD Power and Chip Inductors
SMD power and chip inductors
Surface-mount inductors in this collection include wound CD32/CD43/CD54/CD75/CD105 power-inductor families, shielded CDRH and NR series, molded low-profile power types in 0420–1050-style package labels, multilayer ceramic chip inductors, SMD common-mode chokes and multi-value assortment books. Most are bare PCB components; a matching µH value does not make differently constructed parts electrically or mechanically interchangeable.
Compare the actual SMD type
- Wound power inductors: CD and CDRH style listings span different nominal nH/µH/mH values, heights, shielding arrangements and pack sizes. Compare the selected package dimensions, solder-pad footprint, inductance at specified test conditions, saturation-current rating, temperature-rise or RMS-current rating, DCR, tolerance and frequency-dependent core losses. The names CD54 and CDRH74R are family or package clues, not complete part specifications.
- Molded and shielded power inductors: Options such as 0420, 0530, 0630, 0650, 1040 and 1050, plus NR2520/NR5040-style listings, combine size and inductance choices. Shielding may reduce stray field but does not guarantee a particular EMI result. A “high-current” headline is not a verified current rating for every value in a shared listing; check the exact variant's Isat, Irms, DCR and thermal conditions.
- Multilayer chip inductors: 0402, 0603, 0805, 1206 and 1210-style listings and sample books include nH and µH options. Check whether a package code uses imperial or metric dimensions, then compare frequency, Q, self-resonant frequency, DCR, rated current and land pattern. A 100 nH chip part is not a 100 µH power choke.
- Common-mode chokes: ACM7060 and SRF0905-type multi-winding parts serve common-mode noise filtering and may quote impedance in Ω at a test frequency or inductance per winding. They are not drop-in substitutes for one-winding DC-DC power inductors; compare winding configuration, DCR, current, bandwidth and footprint.
- Mixed search result: An 0805 X7R/X2Y filter capacitor is listed here with “Inductor” in its title, but remains a capacitor. Identify it by its actual part and circuit function, not this collection heading.
Selection steps
- Read the original schematic or bill of materials: energy-storage inductor, RF/chip inductor or common-mode choke. Record the full part number and package before selecting an option.
- Confirm the variant's inductance in nH, µH or mH and its tolerance. Codes such as 1R0, 2R2, 4R7, 100 and 101 require the manufacturer's marking convention; a supplier's “Value of Resistance” field sometimes contains inductance or pack size, not resistance.
- For switching supplies, compare Isat and Irms separately at the real operating temperature, alongside DCR and core-loss behavior at switching frequency. For tuned or RF circuits, check Q and self-resonance. For common-mode filtering, use the impedance-frequency response and intended winding layout.
- Check body length, width, height, pad geometry, solder process, reel or loose-pack quantity and available board clearance. A 10-piece listing and a 1,000-piece listing may cover different purchasing quantities without changing electrical requirements.
FAQ
Will a 10 µH CD54 replace any 10 µH CDRH part? No. Current ratings, DCR, shielding, pad geometry and height can differ.
Is the current rating determined by the package number? No. It depends on the specific part, inductance, winding and test conditions.
Is a common-mode choke a power inductor? No. Its coupled windings and filtering function must match the actual circuit.
