40R2 series planar transformers for forward and bridge topologies, 40–200 W in forward and 300 W in bridge designs. Double-interleave construction (40R2) keeps leakage inductance at 0.10–0.15 µH in a 9.8 mm package; the single-interleave 40R1 family gives a 7.4 mm profile for height-critical layouts. Dual secondary options are available.
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. |
|---|---|---|---|---|---|---|---|---|---|
| 40R2-3444 | 3T | 4T | 4T 1T:1T 1T:1T | 117 | 0.100 | 5 | 8 | 4.00 | A1 |
| 40R2-4444 | 4T | 4T | — | 153 | 0.100 | 8 | 8 | — | — |
| 40R2-4544 | 4T | 5T | — | 194 | 0.100 | 8 | 14 | — | — |
| 40R2-5544 | 5T | 5T | — | 240 | 0.150 | 14 | 14 | — | — |
| 40R2-5644 | 5T | 6T | — | 290 | 0.150 | 14 | 19 | — | — |
| 40R2-6644 | 6T | 6T | — | 345 | 0.150 | 19 | 19 | — | — |
| 40R2-3411 | 3T | 4T | 1T & 1T | 117 | 0.100 | 5 | 8 | 0.6 & 0.6 | A2 |
| 40R2-4411 | 4T | 4T | — | 153 | 0.100 | 8 | 8 | — | — |
| 40R2-4511 | 4T | 5T | — | 194 | 0.100 | 8 | 14 | — | — |
| 40R2-5511 | 5T | 5T | — | 240 | 0.150 | 14 | 14 | — | — |
| 40R2-5611 | 5T | 6T | — | 290 | 0.150 | 14 | 19 | — | — |
| 40R2-6611 | 6T | 6T | — | 345 | 0.150 | 19 | 19 | — | — |
| 40R2-3421 | 3T | 4T | 2T & 1T | 117 | 0.100 | 5 | 8 | 1.7 & 0.6 | A3 |
| 40R2-4421 | 4T | 4T | — | 153 | 0.100 | 8 | 8 | — | — |
| 40R2-4521 | 4T | 5T | — | 194 | 0.100 | 8 | 14 | — | — |
| 40R2-5521 | 5T | 5T | — | 240 | 0.150 | 14 | 14 | — | — |
| 40R2-5621 | 5T | 6T | — | 290 | 0.150 | 14 | 19 | — | — |
| 40R2-6621 | 6T | 6T | — | 345 | 0.150 | 19 | 19 | — | — |
| 40R2-4431 | 4T | 4T | 3T & 1T | 153 | 0.100 | 8 | 8 | 5 & 0.6 | A3 |
| 40R2-4531 | 4T | 5T | — | 194 | 0.100 | 8 | 14 | — | — |
Blank cells repeat the value shown on the first row of the group (the group shares its secondary configuration and schematic). 40R1 single-interleave equivalents, 7.4 mm maximum height, are listed in the data sheet.
| Max Height | H | 9.8 mm (40R2) · 7.4 mm (40R1) |
| Core | ER-type planar, double interleave | |
| Finish | RoHS · Cu leads · Sn/Ag 96/4 |