EFD Cores also known as EFF Cores, EFD Cores used an industry-standard flat design to make the greatest use of space. They are more expensive than E Cores and are available in a variety of sizes, including EFF1505, EFF2007, EFF 2509, EFF2309 and the largest EFF3003. EFD cores are widely utilized in small transformers and inductors
| Type | Fig | DIMENSIONS (mm) | Effective Parameters | AL (nH)+30% -20% | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | c | D | E | F | G | Le(mm) | Ae(mm²) | CF196 | CF139 | ||
| EFF3009 | 8 | 30.0±0.8 | 22.4±0.75 | 15.0±0.15 | 11.2±0.3 | 14.6±0.25 | 9.1±0.2 | 4.9±0.15 | 68 | 69 | 2000 | 2100 |
| EFF2509 | 8 | 25.0±0.65 | 18.7±0.6 | 12.5±0.15 | 9.3±0.25 | 11.4±0.2 | 9.1±0.2 | 5.2±0.15 | 57 | 58 | 2000 | 2050 |
| EFF2309 | 8 | 22.8±0.5 | 16.8±0.4 | 15.0±0.15 | 11.0±0.15 | 10.0±0.25 | 8.6±0.25 | 4.5±0.15 | 65 | 56.5 | 1700 | 1800 |
| EE2007A | 8 | 20.6±0.5 | 16.0±0.5 | 10.0±0.15 | 7.7±0.25 | 8.9±0.2 | 6.65±0.15 | 3.6±0.15 | 47 | 31 | 1200 | 1350 |
| EFF1505A | 8 | 15.7±0.4 | 11.35±0.35 | 7.5±0.15 | 5.5±0.25 | 5.3±0.15 | 4.65±0.15 | 2.4±0.1 | 34 | 15 | 850 | 900 |
