EFD Cores

EFD / STANDARD CORES

EFD Cores

Flat, low-profile transformers

—

Part Number Specifications

—

Dimensions

02 DIMENSION DRAWING

Dimensional drawing

UNIT mm / 2D DRAWING

EFD Cores Dimensional drawing

UNIT mm / 2D DRAWING

03 MODEL TABLE

Part Numbers and Dimensions

Total — part numbers / unit mm

14 types

Dimensions (mm)

part numberMODEL	Aoverall width A	Boverall height B	Clamination thickness C	Dcenter leg width D	Ewindow height E	Fwindow width F	Gouter leg width G
EFD21×20	20.5±0.5	10±0.2	6.65±0.2	8.9±0.2	15.7 min	7.7±0.2	3.6±0.2
EFD20×20	20.3±0.5	10±0.2	6.65±0.2	8.9±0.2	15.6 min	7.7±0.2	3.6±0.2
EFD21×20	20.8±0.5	10±0.2	6.65±0.2	8.9±0.2	15.9 min	7.7±0.2	3.6±0.2
EFD25×25	25±0.5	12.7±0.2	9.1±0.2	11.3±0.2	18.7 min	9.6±0.2	5.2±0.25
EFD26×25	25.6±0.5	12.7±0.2	9.1±0.2	11.3±0.2	19.5 min	9.6±0.2	5.2±0.25
EFD31×30	30.5±0.5	15±0.2	9.1±0.3	14.6±0.3	23.1 min	11.2±0.2	4.9±0.25
EFD31×31	30.7±0.5	15.3±0.2	9±0.3	14.6±0.3	24 min	11.5±0.2	4.9±0.25
EFD34×46	33.7±0.5	23.1±0.2	5±0.3	16.75±0.3	23.7±0.5	18±0.2	3±0.2
EFD41×41	41.3±0.7	20.5±0.2	7.9±0.3	19.6±0.3	31 min	15.5±0.2	3.8±0.2
EFD41×45	40.6±0.7	22.7±0.2	10.6±0.3	16.4±0.3	30.6 min	16.4±0.2	6.6±0.2
EFD40×45	40±0.7	22.5±0.2	8±0.3	19.7±0.3	29.6 min	17.5±0.2	4±0.2
EFD44×53	43.5±0.7	26.55±0.2	6.7±0.3	21.6±0.3	29±0.6	18.75±0.2	4.1±0.2
EFD50×51	50±0.8	25.3±0.2	8±0.3	26.2±0.3	36.2 min	18.6±0.25	3.9±0.2
EFD15×16	15 —	8.15 —	4.65 —	5.3 —	11.15 —	6.25 —	2.4 —

Specifications (effective parameters / corresponding material AL / weight)

part numberMODEL	magnetic path length Lemm	effective cross-section Aemm²	effective volume Vemm³	AL·MP40nH/N²	AL·MP44nH/N²	AL·MP95nH/N²	weightg
EFD21×20	45.3	30.25	1370.03	1400	1400	1800	8.091
EFD20×20	45.1	29.93	1349.9	1400	1400	1700	8.006
EFD21×20	45.57	30.55	1392.26	1400	1400	1800	8.192
EFD25×25	55.61	55.68	3096.52	2200	2200	2800	18.051
EFD26×25	56.24	54.81	3082.56	2100	2200	2800	18.052
EFD31×30	64.65	67.16	4341.78	2300	2400	3100	25.741
EFD31×31	65.81	63.18	4157.81	2200	2200	2800	25.279
EFD34×46	92.25	50.25	4635.49	1300	1400	1800	26.263
EFD41×41	87.79	76.54	6719.6	2100	2200	2800	39.516
EFD41×45	94.82	109.23	10357.25	2800	2900	3700	60.529
EFD40×45	94.33	79.18	7469.39	2000	2100	2700	43.13
EFD44×53	101.32	94.32	9556.45	2300	2400	3100	56.389
EFD50×51	102.71	104.79	10762.35	2500	2600	3400	64.447
EFD15×16	36.53	14.57	532.47	800	—	—	3.272

04 SERIES NOTES

Series Description

← BackStandard Cores