55R2 series planar transformers for forward and bridge topologies, rated to 350 W in forward and 650 W in PSFB designs. Double-interleave construction holds leakage inductance to 0.10–0.28 µH, and the 30 × 26 mm footprint with 10.2 mm maximum height suits high-density converters. 55R1 single-interleave equivalents give a 7.4 mm profile.
Stresses beyond values listed may cause permanent damage. Functional operation beyond any rating is not implied. All values at T<sub>amb</sub> = 25 °C unless noted.
| Part Number | PRI. A | PRI. B | Sec. | Primary Induct. (µH min) | Leakage Induct. (µH nom) | DCR PRI. A (mΩ) | DCR PRI. B (mΩ) | DCR Sec. (mΩ) | Sch. |
|---|---|---|---|---|---|---|---|---|---|
| 55R2-4444 | 4T | 4T | 4T | 216 | 0.100 | 7 | 7 | 3.50 | A1 |
| 55R2-5544 | 5T | 5T | — | 340 | 0.150 | 12 | 12 | — | — |
| 55R2-6644 | 6T | 6T | — | 480 | 0.180 | 17 | 17 | — | — |
| 55R2-7744 | 7T | 7T | — | 660 | 0.250 | 25 | 25 | — | — |
| 55R2-8844 | 8T | 8T | — | 860 | 0.280 | 32 | 32 | — | — |
| 55R2-4411 | 4T | 4T | 1T & 1T | 216 | 0.100 | 7 | 7 | 0.45 & 0.45 | A2 |
| 55R2-5511 | 5T | 5T | — | 340 | 0.150 | 12 | 12 | — | — |
| 55R2-6611 | 6T | 6T | — | 480 | 0.180 | 17 | 17 | — | — |
| 55R2-7711 | 7T | 7T | — | 660 | 0.250 | 25 | 25 | — | — |
| 55R2-8811 | 8T | 8T | — | 860 | 0.280 | 32 | 32 | — | — |
Blank cells repeat the value shown on the first row of the group. Primary inductance is measured with both primary windings in series (2–5, with 3 and 4 shorted); leakage with secondaries shorted.
| Max Height | H | 10.2 mm (55R2) · 7.4 mm (55R1) |
| Footprint | 30 × 26 mm max | |
| Finish | RoHS · Cu leads · Sn/Ag 96/4 |