Ferrite Cores & Accessories

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Power Inductive EER Cores

Fair-Rite Power Inductive EER Cores have been designed to make optimum use of a given volume of ferrite material for maximum throughput power. The structure, which includes a round center post, approaches a nearly uniform cross-sectional area throughout the core and provides a winding area that minimizes winding losses. EER Cores can be supplied with the center post gapped to mechanical specifications as well as an AL value. Fair-Rite Power Inductive EER Cores are available in a range of sizes from EER25.5/18 to EER49/54 and three materials with initial permeability ranging from 2300 to 3000.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (CLP) Filter the results in the table by unit price based on your quantity.	Qty.	Series	Product	Type	Core	Core Size	Inductance	Tolerance	Core Material	Packaging
Ferrite Cores & Accessories 98 EER Core EER49/54 Ind 5350 nH 25% TOL 9598495402 Fair-Rite 1: $6.972 109In Stock	Mfr. Part # 9598495402 Mouser Part # 623-9598495402	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER49/54 Ind 5350 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	109In Stock	$6.972 $4.785 $4.056 $3.555 View $3.087 $3.053	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	49 x 27 x 17.2	5.35 uH	25 %	98	Bulk
Ferrite Cores & Accessories 95 ER Core Set Ind 950 nH 25% TOL 9595100502 Fair-Rite 1: $1.265 600In Stock	Mfr. Part # 9595100502 Mouser Part # 623-9595100502	Fair-Rite	Ferrite Cores & Accessories 95 ER Core Set Ind 950 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	600In Stock	$1.265 $869 $744 $660 View $595 $489 $458 $442 $441	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	ER Core	9.35 x 2.45 x 4.9	950 nH	25 %	95	Bulk
Ferrite Cores & Accessories 95 EER Core EER25.5 Ind 2200 nH 25% TOL 9595261802 Fair-Rite 1: $1.800 1.110In Stock	Mfr. Part # 9595261802 Mouser Part # 623-9595261802	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER25.5 Ind 2200 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	1.110In Stock	$1.800 $1.253 $1.070 $946 View $846 $696 $660 $613	Min.: 1 Mult.: 1	95	Ferrite Cores		EER Core	25.5	2.2 uH	25 %	95	Bulk
Ferrite Cores & Accessories 78 EER Core EER42/44 Ind 4000 nH 25% TOL 9578424402 Fair-Rite 1: $5.628 125In Stock	Mfr. Part # 9578424402 Mouser Part # 623-9578424402	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER42/44 Ind 4000 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	125In Stock	$5.628 $3.851 $3.281 $2.848 View $2.484 $2.392	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	42 x 22 x 15.2	4 uH	25 %	78	Bulk
Ferrite Cores & Accessories 95 EER Core EER35/42 Ind 3200 nH 25% TOL 9595354202 Fair-Rite 1: $4.637 165In Stock 330Expected 11/12/2026	Mfr. Part # 9595354202 Mouser Part # 623-9595354202	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER35/42 Ind 3200 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	165In Stock 330Expected 11/12/2026	$4.637 $3.179 $2.711 $2.358 View $2.051 $1.903	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	35 x 21 x 11.3	3.2 uH	25 %	95	Bulk
Ferrite Cores & Accessories 98 EER Core EER35/42 Ind 2600 nH 25% TOL 9598354202 Fair-Rite 1: $3.543 321In Stock	Mfr. Part # 9598354202 Mouser Part # 623-9598354202	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER35/42 Ind 2600 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	321In Stock	$3.543 $2.438 $2.085 $1.834 View $1.606 $1.447	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	35 x 21 x 11.3	2.8 uH	25 %	98	Bulk
Ferrite Cores & Accessories 98 EER Core EER40/46 Ind 3600 nH 25% TOL 9598404602 Fair-Rite 1: $4.705 466In Stock	Mfr. Part # 9598404602 Mouser Part # 623-9598404602	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER40/46 Ind 3600 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	466In Stock	$4.705 $3.224 $2.746 $2.392 View $2.062 $1.857	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	40 x 22.9 x 13.3	3.6 uH	25 %	98	Bulk
Ferrite Cores & Accessories 78 ER Core Set Ind 1200 nH 25% TOL 9578110502 Fair-Rite 1: $1.105 4.702In Stock	Mfr. Part # 9578110502 Mouser Part # 623-9578110502	Fair-Rite	Ferrite Cores & Accessories 78 ER Core Set Ind 1200 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	4.702In Stock	$1.105 $771 $664 $590 View $522 $439 $381 $324	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	ER Core	10.8 x 2.45 x 5.9	1.2 uH	25 %	78	Bulk
Ferrite Cores & Accessories 98 ER Core Set Ind 900 nH 25% TOL 9598100502 Fair-Rite 1: $957 3.910In Stock	Mfr. Part # 9598100502 Mouser Part # 623-9598100502	Fair-Rite	Ferrite Cores & Accessories 98 ER Core Set Ind 900 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	3.910In Stock	$957 $671 $579 $515 View $456 $384 $343 $306 $292	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	ER Core	9.35 x 2.45 x 4.9	900 nH	25 %	98	Bulk
Ferrite Cores & Accessories 78 EER Core EER25.5 Ind 1800 nH 25% TOL 9578261802 Fair-Rite 1: $1.641 749In Stock	Mfr. Part # 9578261802 Mouser Part # 623-9578261802	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER25.5 Ind 1800 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	749In Stock	$1.641 $1.151 $981 $908 View $812 $668 $633 $588	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	25.5 x 9.3 x 7.5	1.8 uH	25 %	78	Bulk
Ferrite Cores & Accessories 95 EER Core EER28/28 Ind 3500 nH 25% TOL 9595282802 Fair-Rite 1: $2.700 542In Stock	Mfr. Part # 9595282802 Mouser Part # 623-9595282802	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER28/28 Ind 3500 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	542In Stock	$2.700 $1.903 $1.629 $1.435 View $1.230 $1.139 $1.047	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	28.5 x 14 x 11.4	3.5 uH	25 %	95	Bulk
Ferrite Cores & Accessories 78 EER Core EER28/28 Ind 2800 nH 25% TOL 9578282802 Fair-Rite 1: $3.999 88In Stock	Mfr. Part # 9578282802 Mouser Part # 623-9578282802	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER28/28 Ind 2800 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	88In Stock	$3.999 $2.746 $2.347 $2.073 View $1.823 $1.663	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	28.5 x 14 x 11.4	2.8 uH	25 %	78	Bulk
Ferrite Cores & Accessories 78 EER Core EER35/42 Ind 2600 nH 25% TOL 9578354202 Fair-Rite 1: $3.429 187In Stock	Mfr. Part # 9578354202 Mouser Part # 623-9578354202	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER35/42 Ind 2600 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	187In Stock	$3.429 $2.370 $2.017 $1.777 View $1.538 $1.356	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	35 x 21 x 11.3	2.6 uH	25 %	78	Bulk
Ferrite Cores & Accessories 95 EER Core EER28/34 Ind 3350 nH 25% TOL 9595283402 Fair-Rite 1: $3.509 140In Stock	Mfr. Part # 9595283402 Mouser Part # 623-9595283402	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER28/34 Ind 3350 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	140In Stock	$3.509 $2.415 $2.108 $1.846 View $1.618 $1.424	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	28.5 x 16.9 x	3.35 uH	25 %	95	Bulk
Ferrite Cores & Accessories 95 EER Core EER40/46 Ind 4200 nH 25% TOL 9595404602 Fair-Rite 1: $5.366 58In Stock	Mfr. Part # 9595404602 Mouser Part # 623-9595404602	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER40/46 Ind 4200 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	58In Stock	$5.366 $3.680 $3.133 $2.723 View $2.358 $2.279	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	40 x 22.9 x 13.3	4.2 uH	25 %	95	Bulk
Ferrite Cores & Accessories 95 EER Core EER49/54 Ind 6500 nH 25% TOL 9595495402 Fair-Rite 1: $7.531 38In Stock	Mfr. Part # 9595495402 Mouser Part # 623-9595495402	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER49/54 Ind 6500 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	38In Stock	$7.531 $5.104 $4.352 $3.760 $3.612	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	49 x 27 x 17.2	6.5 uH	25 %	95	Bulk
Ferrite Cores & Accessories 98 EER Core EER28/28 Ind 2800 nH 25% TOL 9598282802 Fair-Rite 1: $2.370 135In Stock	Mfr. Part # 9598282802 Mouser Part # 623-9598282802	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER28/28 Ind 2800 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	135In Stock	$2.370 $1.652 $1.492 $1.470	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	28.5 x 14 x 11.4	2.8 uH	25 %	98	Bulk
Ferrite Cores & Accessories 98 EER Core EER42/44 Ind 4100 nH 25% TOL 9598424402 Fair-Rite 1: $5.377 41In Stock	Mfr. Part # 9598424402 Mouser Part # 623-9598424402	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER42/44 Ind 4100 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	41In Stock	$5.377 $3.680 $3.110 $2.723 $2.347	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	42 x 22 x 15.2	4.1 uH	25 %	98	Bulk
Ferrite Cores & Accessories 78 EER Core EER28/34 Ind 2600 nH 25% TOL 9578283402 Fair-Rite 1: $1.641 Non-Stocked	Mfr. Part # 9578283402 Mouser Part # 623-9578283402	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER28/34 Ind 2600 nH 25% TOL Learn More about Fair-Rite fairrite eer cores		Non-Stocked	$1.641 $1.136 $972 $859 View $769 $632 $599 $557	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	28.5 x 16.9 x 11.4	2.6 uH	25 %	78	Bulk
Ferrite Cores & Accessories 78 EER Core EER40/46 Ind 3400 nH 25% TOL 9578404602 Fair-Rite 500: $2.005 Non-Stocked Lead-Time 20 Weeks	Mfr. Part # 9578404602 Mouser Part # 623-9578404602	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER40/46 Ind 3400 nH 25% TOL Learn More about Fair-Rite fairrite eer cores	Datasheet	Non-Stocked Lead-Time 20 Weeks	$2.005	Min.: 500 Mult.: 100	95	Ferrite Cores	Ungapped	EER Core	40 x 22.9 x 13.3	3.4 uH	25 %	78	Bulk
Ferrite Cores & Accessories 78 EER Core EER49/54 Ind 4200 nH 25% TOL 9578495402 Fair-Rite 1: $4.056 Non-Stocked	Mfr. Part # 9578495402 Mouser Part # 623-9578495402	Fair-Rite	Ferrite Cores & Accessories 78 EER Core EER49/54 Ind 4200 nH 25% TOL Learn More about Fair-Rite fairrite eer cores		Non-Stocked	$4.056 $2.780 $2.370 $2.062 View $1.777 $1.663	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	49 x 27 x 17.2	4.2 uH	25 %	78	Bulk
Ferrite Cores & Accessories 95 ER Core Set Ind 1600nH 25% TOL 9595110502 Fair-Rite 7.560: $661 Non-Stocked Lead-Time 20 Weeks	Mfr. Part # 9595110502 Mouser Part # 623-9595110502	Fair-Rite	Ferrite Cores & Accessories 95 ER Core Set Ind 1600nH 25% TOL Learn More about Fair-Rite fairrite eer cores		Non-Stocked Lead-Time 20 Weeks	$661	Min.: 7.560 Mult.: 7.560	95	Ferrite Cores	Ungapped	ER Core	10.8 x 2.45 x 5.9	1.35 uH	25 %	95	Bulk
Ferrite Cores & Accessories 95 EER Core EER42/44 Ind 5900 nH 25% TOL 9595424402 Fair-Rite 1: $3.691 Non-Stocked	Mfr. Part # 9595424402 Mouser Part # 623-9595424402	Fair-Rite	Ferrite Cores & Accessories 95 EER Core EER42/44 Ind 5900 nH 25% TOL Learn More about Fair-Rite fairrite eer cores		Non-Stocked	$3.691 $2.541 $2.165 $1.914 View $1.675 $1.481	Min.: 1 Mult.: 1	95	Ferrite Cores		EER Core	42 x 44	5.9 uH	25 %	95	Bulk
Ferrite Cores & Accessories 98 EER Core EER25.5 Ind 1800 nH 25% TOL 9598261802 Fair-Rite 1: $786 Non-Stocked	Mfr. Part # 9598261802 Mouser Part # 623-9598261802	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER25.5 Ind 1800 nH 25% TOL Learn More about Fair-Rite fairrite eer cores		Non-Stocked	$786 $545 $474 $423 View $374 $318 $278 $254 $237	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	25.5 x 9.3 x 7.5	1.8 uH	25 %	98	Bulk
Ferrite Cores & Accessories 98 EER Core EER28/34 Ind 2710 nH 25% TOL 9598283402 Fair-Rite 1: $1.344 Non-Stocked	Mfr. Part # 9598283402 Mouser Part # 623-9598283402	Fair-Rite	Ferrite Cores & Accessories 98 EER Core EER28/34 Ind 2710 nH 25% TOL Learn More about Fair-Rite fairrite eer cores		Non-Stocked	$1.344 $923 $790 $701 View $631 $518 $485 $467	Min.: 1 Mult.: 1	95	Ferrite Cores	Ungapped	EER Core	28.5 x 16.9 x 11.4	2.71 uH	25 %	98	Bulk