Rings produced on the base of iron powder are widely used and produced with sizes 3,5...165 mm. Such Iron powder cores are produced under the pressure. The distributed gap fis being formed due to ferrum particles are separated from each other that provides high values of saturation induction of the powder material.

Despite the fact that the iron powder cores have value of losses (800mW/sm₃ , (F=100kHz, B=0,05T)) and they can't compete with other classes of powder materials such as Kool M, MPP, High Flux, XFlux one important advantage of such cores should be mentioned. Due to the cheapness of a composition ( 100% Fe) iron powder cores are characterised by low price comparing to other powder materials. For choosing of powder material it is recommended to apply to the Magnetics materials row.

Example of designation in design documentation:

K52 R57,2*35,7*25,4 DT225-52B, where:

DT — ring shaped core
225 — core’s standard size
52 — powder material’s brand

Color Codes of Cores

Each powder material has own coating color.

Material’s Number	Permeability (µe)	Temperature Stability (ppm/С)	Color Codes of Cores
-2	10	95	Red / transparent
-8	35	255	Yellow / red
18	55	385	Green / red
-26	75	825	Yellow / white
-28	22	415	Sky-blue
-33	33	635	grey
-34	33	565	Grey / light-blue
-35	33	665	Yellow / grey
-38	85	955	black
-40	60	950	Green / yellow
-45	100	1043	Black / black
-52	75	650	Light-green / light-blue

Permissible Dispersions on AL and Geometrical Dimensions

Tolerances on dispersions of geometrical dimensions (after coating) for powder iron ring-shaped cores:

Codes of Standard Size	OD mm	ID mm	HT mm
DT14~DT72	±0.50	±0.50	±0.50
DT80~DT141	±0.50	±0.50	±0.50
DT150~DT225	±0.64	±0.64	±0.76
DT249~DT400	±0.76	±0.76	±0.76
DT520~DT650	±1.27	±1.27	±1.27

Tolerances on dispersions of single-turn inductance coefficient AL for powder iron based ring-shaped cores:

Material’s Number	-2	-8, 18, -26, -28, -33, -34, -35, -38, -40, -45, -52
Dispersion on AL	±5%	±10%

Nomenclature List of Powder Iron Ring-shaped Cores

Nomenclature list of powder iron based ring-shaped cores may be downloaded here (ru).

Order code	Geometrical Dimensions			Effective Parameters
Order code	OD mm	ID mm	HT mm	L cm	Ae cm²	Ve cm³
DT650-XX	165	88.9	50.8	39.9	18.4	734
DT520-XX	132	78.2	20.3	33.1	10.5	347
DT400-XXD	102	57.2	33	25	6.85	171
DT400-XXB	102	57.2	25.4	25	5.35	133
DT400-XX	102	57.2	16.5	25	3.46	86.4
DT300-XXD	77.2	49	25.4	19.8	3.38	67
DT300-XX	77.2	49	12.7	19.8	1.68	33.4
DT252-XX	64	40	32	16.3	3.65	59.56
DT250-XXB	63.5	31.8	38.1	15	5.74	86.09
DT250-XXA	63.5	31.8	12.7	15	1.92	28.7
DT250-XX	63.5	31.8	25.4	15	3.84	57.4
DT249-XX	63.5	35.7	25.4	15.6	3.36	52.3
DT225-XXC	57.2	35.7	18.5	14.58	1.89	27.56
DT225-XXB	57.2	35.7	25.4	14.6	2.59	37.8
DT225-XX	57.2	35.7	14	14.6	1.42	20.7
DT224-XX	57.2	31.8	19.1	14	2.31	32.2
DT201-XX	50.8	24.1	22.2	11.8	2.81	33.2
DT200-XXB	50.8	31.8	25.4	13	2.32	30
DT200-XX	50.8	31.8	14	13	1.27	16.4
DT184-XX	46.7	24.1	18	11.2	1.88	21
DT175-XX	44.5	27.2	16.5	11.2	1.34	15
DT157-XX	39.9	24.1	14.5	10.1	1.06	10.7
DT150-XXA	38.4	21.5	8.26	9.38	0.657	6.16
DT150-XX	38.4	21.5	11.1	9.38	0.887	8.31
DT141-XX	35.9	22.4	10.5	9.14	0.674	6.16
DT132-XXB	33	17.8	15.4	7.96	1.17	8.89
DT132-XXA	33	17.8	7.92	7.96	0.574	4.57
DT132-XX	33	17.8	11.1	7.96	0.805	6.41
DT131-XX	33	16.3	11.1	7.72	0.885	6.84
DT130-XXA	33	19.8	5.72	8.28	0.361	2.99
DT124-XX	31.6	18	7.11	7.75	0.459	3.55
DT108-XX	27.5	13.5	11.5	6.44	0.76	4.92
DT106-XXB	26.9	14.5	14.6	6.49	0.858	5.57
DT106-XXA	26.9	14.5	7.92	6.49	0.461	3
DT106-XX	26.9	14.5	11.1	6.49	0.659	4.28
DT95-XXB	23.9	12.6	9.53	5.72	0.51	2.91
DT94-XX	23.9	14.2	7.92	5.97	0.362	2.16
DT93-XXA	23.9	12	6	5.636	0.339	1.91
DT93-XX	23.9	12	9.5	5.64	0.54	3.03
DT91-XX	23	11	8	5.34	0.46	2.43
DT90-XXB	22.9	14	11.2	5.78	0.464	2.68
DT90-XXA	22.9	14	4.5	5.78	0.19	1.1
DT90-XX	22.9	14	9.53	5.78	0.395	2.28
DT80-XXD	20.2	12.6	12.7	5.14	0.453	2.33
DT80-XXB	20.2	12.6	9.53	5.14	0.347	1.78
DT80-XX	20.2	12.6	6.35	5.14	0.231	1.19
DT72-XXB	18.3	7.11	8.2	4.01	0.434	1.74
DT72-XX	18.3	7.11	6.6	4.01	0.349	1.4
DT68-XXD	17.5	9.4	9.53	4.23	0.358	1.52
DT68-XXC	17.5	9.4	5.1	4.23	0.194	0.828
DT68-XXB	17.5	9.4	8.7	4.23	0.333	1.41
DT68-XXA	17.5	9.4	6.35	4.23	0.242	1.03
DT68-XX	17.5	9.4	4.83	4.23	0.179	0.759
DT60-XXD	15.2	8.53	11.9	3.74	0.374	1.4
DT60-XXB	15.2	8.53	7.25	3.74	0.228	0.853
DT60-XX	15.2	8.53	5.94	3.74	0.187	0.699
DT57-XXA	14.6	6.93	6.68	3.38	0.239	0.805
DT57-XX	14.6	6.93	4.98	3.38	0.178	0.601
DT51-XXC	12.7	5.08	6.35	2.79	0.223	0.622
DT51-XXB	12.7	5.08	7.92	2.79	0.282	0.786
DT50-XXE	12.7	7.7	5.46	3.19	0.128	0.407
DT50-XXD	12.7	7.7	9.53	3.19	0.223	0.711
DT50-XXC	12.7	7.7	8.51	3.19	0.2	0.637
DT50-XXB	12.7	7.7	6.35	3.19	0.148	0.471
DT50-XX	12.7	7.7	4.83	3.19	0.112	0.358
DT44-XXD	11.2	5.82	8.59	2.68	0.219	0.587
DT44-XXC	11.2	5.82	6.35	2.68	0.157	0.434
DT44-XXB	11.2	5.82	4.67	2.68	0.119	0.319
DT44-XX	11.2	5.82	4.04	2.68	0.099	0.266
DT40-XX	10.2	5.21	4.14	2.41	0.093	0.223
DT38-XXB	9.53	4.45	5.6	2.18	0.132	0.287
DT38-XX	9.53	4.45	4.83	2.18	0.114	0.248
DT37-XXD	9.53	5.21	7	2.31	0.138	0.319
DT37-XXC	9.53	5.21	2.44	2.31	0.048	0.111
DT37-XXB	9.53	5.21	5	2.31	0.098	0.226
DT37-XX	9.53	5.21	3.25	2.31	0.064	0.147
DT32-XX	8.31	4.29	4.01	1.91	0.081	0.154
DT30-XXF	7.8	3.84	2.28	1.84	0.043	0.077
DT30-XX	7.8	3.84	3.25	1.84	0.06	0.11
DT27-XX	7.11	3.84	3.25	1.71	0.047	0.08
DT26-XXA	6.73	2.67	3.9	1.47	0.073	0.107
DT26-XX	6.73	2.67	4.83	1.47	0.09	0.133
DT25-XXF	6.48	3.05	3.17	1.5	0.048	0.073
DT25-XXC	6.48	3.05	1.79	1.5	0.027	0.041
DT25-XXB	6.48	3.05	3.25	1.5	0.049	0.074
DT25-XX	6.48	3.05	2.44	1.5	0.037	0.055
DT20-XX	5.08	2.24	1.78	1.15	0.023	0.026
DT16-XX	4.06	1.98	1.52	0.93	0.015	0.014
DT14-XXA	3.43	1.7	1.52	0.81	0.012	0.0098

Powder Iron Ring Shaped Cores

Color Codes of Cores

Permissible Dispersions on AL and Geometrical Dimensions

Tolerances on dispersions of single-turn inductance coefficient AL for powder iron based ring-shaped cores:

Nomenclature List of Powder Iron Ring-shaped Cores