Datasheet

2008 Sep 01 1679
Ferroxcube
Ferrite toroids TN23/14/7
RING CORES (TOROIDS)
Effective core parameters
Coating
The cores are coated with polyamide 11 (PA11), flame
retardant in accordance with “UL 94V-2” ; UL file number
E 45228 (M).
The colour is white.
Maximum operating temperature is 160 °C.
Isolation voltage
DC isolation voltage: 2000 V.
Contacts are applied on the edge of the ring core, which is
also the critical point for the winding operation.
R
i
n
g
c
o
r
e
d
a
t
a
SYMBOL PARAMETER VALUE UNIT
Σ(I/A) core factor (C1) 1.81 mm
−1
V
e
effective volume 1722 mm
3
I
e
effective length 55.8 mm
A
e
effective area 30.9 mm
2
m mass of core ≈ 8.4 g
Fig.1 TN23/14/7 ring core.
Dimensions in mm.
handbook, halfpage
;;
;;
;;
;;
CBW307
13.1 ±0.6
7.5
±0.45
coating PA11
(≈0.3)
23.7 ±0.7
GRADE
A
L
(nH)
µ
i
TYPE NUMBER
4C65 87 ± 25% ≈ 125 TN23/14/7-4C65
4A11 486 ± 25% ≈ 700
(1)
TN23/14/7-4A11
3R1
(2)
−≈ 800 TN23/14/7-3R1
3F3 1250 ± 25% ≈ 1800 TN23/14/7-3F3
3C90 1600 ± 25% ≈ 2300 TN23/14/7-3C90
3C11 3000 ± 25% ≈ 4300 TN23/14/7-3C11
3E25 3820 ± 25% ≈ 5500 TN23/14/7-3E25
1. Old permeability specification maintained.
2. Due to the rectangular BH-loop of 3R1, inductance values strongly depend on the magnetic state of the ring core and measuring
conditions. Therefore no A
L
value is specified. For the application in magnetic amplifiers A
L
is not a critical parameter.
WARNING
Do not use 3R1 cores close to their mechanical resonant frequency. For more information refer to “3R1” material
specification in this data handbook.