Short answer: The MAZO VCMA-0420-xxx-M-1A series is a shielded, AEC-Q200 qualified power inductor family in a 4.75x4.45x2.0 mm maximum package, with 14 inductance values from 0.10 to 10.0 µH (±20 %, tested at 1 MHz / 1.0 V). Typical Isat runs from 22.0 A down to 2.2 A and DCR from 3.5 mΩ (typ) up to 281.0 mΩ (max). Every value below is read from the MAZO VCMA-0420 datasheet, revision A4; that document is the reference, not this page.
Full electrical table (MAZO VCMA-0420 datasheet rev A4)
| Part number | L0 (µH) | DCR typ / max (mΩ) | Idc typ / MAX column (A) | Isat typ / MAX column (A) |
|---|---|---|---|---|
| [VCMA-0420-R10-M-1A](/store/mazo-power-inductors/VCMA-0420-R10-M-1A) | 0.10 | 3.5 / 4.0 | 15.0 / 12.0 | 22.0 / 20.0 |
| [VCMA-0420-R22-M-1A](/store/mazo-power-inductors/VCMA-0420-R22-M-1A) | 0.22 | 5.0 / 5.6 | 12.0 / 10.0 | 18.5 / 17.5 |
| [VCMA-0420-R33-M-1A](/store/mazo-power-inductors/VCMA-0420-R33-M-1A) | 0.33 | 7.0 / 8.0 | 10.0 / 9.0 | 16.0 / 15.0 |
| [VCMA-0420-R47-M-1A](/store/mazo-power-inductors/VCMA-0420-R47-M-1A) | 0.47 | 10.5 / 12.0 | 8.5 / 8.0 | 12.0 / 11.0 |
| [VCMA-0420-R56-M-1A](/store/mazo-power-inductors/VCMA-0420-R56-M-1A) | 0.56 | 11.0 / 13.0 | 8.0 / 7.5 | 10.5 / 10.0 |
| [VCMA-0420-R68-M-1A](/store/mazo-power-inductors/VCMA-0420-R68-M-1A) | 0.68 | 12.0 / 14.0 | 7.5 / 7.0 | 9.0 / 8.5 |
| [VCMA-0420-1R0-M-1A](/store/mazo-power-inductors/VCMA-0420-1R0-M-1A) | 1.0 | 19.5 / 24.0 | 6.5 / 6.0 | 7.5 / 7.0 |
| [VCMA-0420-1R2-M-1A](/store/mazo-power-inductors/VCMA-0420-1R2-M-1A) | 1.2 | 22.0 / 27.0 | 6.2 / 5.8 | 7.0 / 6.5 |
| [VCMA-0420-1R5-M-1A](/store/mazo-power-inductors/VCMA-0420-1R5-M-1A) | 1.5 | 25.0 / 30.0 | 4.8 / 4.5 | 6.5 / 6.0 |
| [VCMA-0420-2R2-M-1A](/store/mazo-power-inductors/VCMA-0420-2R2-M-1A) | 2.2 | 42.0 / 50.0 | 4.2 / 4.0 | 5.5 / 5.0 |
| [VCMA-0420-3R3-M-1A](/store/mazo-power-inductors/VCMA-0420-3R3-M-1A) | 3.3 | 72.0 / 82.0 | 3.3 / 3.0 | 4.5 / 4.0 |
| [VCMA-0420-4R7-M-1A](/store/mazo-power-inductors/VCMA-0420-4R7-M-1A) | 4.7 | 95.0 / 105.0 | 2.5 / 2.2 | 3.3 / 3.0 |
| [VCMA-0420-6R8-M-1A](/store/mazo-power-inductors/VCMA-0420-6R8-M-1A) | 6.8 | 168.0 / 185.0 | 2.0 / 1.8 | 2.6 / 2.3 |
| [VCMA-0420-100-M-1A](/store/mazo-power-inductors/VCMA-0420-100-M-1A) | 10.0 | 245.0 / 281.0 | 1.7 / 1.4 | 2.2 / 2.1 |
Datasheet notes that matter when you compare this table with another brand:
- Isat is the DC current that makes L0 drop by approximately 30 %. A 20 % definition (used by some other makers) gives a lower number for the same core.
- Idc is the DC current that causes an approximate 40 °C temperature rise from a 25 °C ambient.
- The MAX column for Idc and Isat is lower than the typical value. For a design margin, use that column, not the typical one.
- Rated voltage is 40 V for every value in the series.
- Operating range is –55 °C to +125 °C including self-heating: part temperature (ambient + rise) must stay at or below 125 °C.
Which limit hits first?
The ratio Isat ÷ Idc tells you how much peak (ripple + transient) current a part tolerates above the current that heats it by 40 °C. In this series it ranges from 1.13 (VCMA-0420-1R2-M-1A) to 1.60 (VCMA-0420-R33-M-1A). Values with a ratio below 1.2 (VCMA-0420-1R0-M-1A, VCMA-0420-1R2-M-1A) leave little room for peak current: size them on Isat first, then check heating.
DC resistance and losses
DC copper loss is I² × DCR. Use the DCR max column for worst-case loss and thermal estimates.
How to pick a value (and verify a substitute)
1. Start from the inductance your converter needs, then check the peak current against the Isat MAX column.
2. Check RMS current against Idc, and estimate part temperature at your worst ambient: it must stay at or below 125 °C.
3. When replacing another brand, compare like for like: Isat drop definition, temperature-rise definition, inductance test frequency and voltage, height and land pattern. Interchangeability is never established by datasheet alone; verify on your board.
Original OEM documents (links only)
1. MAZO VCMA-0420 datasheet, revision A4 (electrical table, dimensions, reflow profile, packaging). https://store.mst-sg.com/storefront/mazo-datasheets/VCMA-0420/MAZO-VCMA-0420-datasheet-A4.pdf
Request a quote or samples
Each part number in the table links to its store page with an RFQ button. To have MST check a VCMA-0420 value against the part you use today, post a [find-part request](/community/new?kind=part_request&mpn=VCMA-0420-1R2-M-1A) or send a [sourcing RFQ](/services/sourcing-rfq?sourcing_mode=supplier_match) with your current part number, peak and RMS current, switching frequency, ambient temperature and height limit.
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