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➢ Within what range of air gap (s) are the k1 and k2 calculation factors valid?

Part No.	B66337
Manufacturer	EPCOS
Size	77 Kbytes
Pages	2 pages
Description	EC 35/17/10 Core

Datasheet Summary with AI

|Material|A value L nH|µ e|A L1min nH|P V W/set|Ordering code|
|---|---|---|---|---|---|
|N27|2100 + 30/– 20 %|1530|1710|< 1,10 (200 mT, 25 kHz, 100 °C)|B66337-G-X127|

|Gapped|Col2|Col3|Col4|Col5|
|---|---|---|---|---|
|Material|_g_ mm|_A_L value approx. nH|µe|Ordering code|
|N27|0,10 ± 0,02 0,25 ± 0,02 0,50± 0,05 1,00± 0,05|651 336 203 123|475 245 148 90|B66337-G100-X127 B66337-G250-X127 B66337-G500-X127 B66337-G1000-X127|

️· _A_ L value applies to a core set with one ungapped core (_g_ = 0) and one gapped core (_g_ > 0).

## Calculation Factors & Validity Range

|Material|_K1_(25 °C)|_K2_(25 °C)|_K3_(25 °C)|_K4_(25 °C)|_K3_ (100 °C)|_K4_ (100 °C)|
|---|---|---|---|---|---|---|
|N27|123|– 0,724|214|– 0,847|198|– 0,865|

️· K1, K2: 0.10 mm < _s_ < 2.50 mm
️· K3, K4: 70 nH < _A_ L < 680 nH

# EC 35/17/10 E Cores

## General Characteristics

️· Complies with IEC 60647
️· Compact E core with large winding window
️· Round center leg, suitable for thick winding wires
️· Supplied as single units

## Magnetic Properties (Per Set)

️· Σ _l/A_ = 0.92 mm–1
️· _l_e = 77.4 mm
️· _A_e = 84.3 mm2
️· _A_min = 71 mm2
️· _V_e = 6,530 mm3
️· Approximate weight: 36 g/set

## Ordering Information & Material Properties

Material A value L nH µ e A L1min nH P V W/set Ordering code

N27 2100 + 30/– 20 % 1530 1710 < 1,10 (200 mT, 25 kHz, 100 °C) B66337-G-X127

Gapped Col2 Col3 Col4 Col5

Material _g_ mm _A_L value approx. nH µe Ordering code

N27 0,10 ± 0,02 0,25 ± 0,02 0,50± 0,05 1,00± 0,05 651 336 203 123 475 245 148 90 B66337-G100-X127 B66337-G250-X127 B66337-G500-X127 B66337-G1000-X127

️· _A_ L value applies to a core set with one ungapped core (_g_ = 0) and one gapped core (_g_ > 0).

## Calculation Factors & Validity Range

Material _K1_(25 °C) _K2_(25 °C) _K3_(25 °C) _K4_(25 °C) _K3_ (100 °C) _K4_ (100 °C)

N27 123 – 0,724 214 – 0,847 198 – 0,865

️· K1, K2: 0.10 mm < _s_ < 2.50 mm
️· K3, K4: 70 nH < _A_ L < 680 nH

Gapped	Col2	Col3	Col4	Col5
Material	_g_<br>mm	_A_L value approx.<br>nH	µe	Ordering code
N27	0,10 ± 0,02<br>0,25 ± 0,02<br>0,50± 0,05<br>1,00± 0,05	651<br>336<br>203<br>123	475<br>245<br>148<br>90	B66337-G100-X127<br>B66337-G250-X127<br>B66337-G500-X127<br>B66337-G1000-X127