FERROXCUBE
DATA SHEET
RM8/I
RM, RM/I, RM/ILP cores and
accessories
Supersedes data of September 2004
2008 Sep 01
Ferroxcube
RM, RM/I, RM/ILP cores and accessories
CORE SETS
Effective core parameters
SYMBOL
Σ(I/A)
V
e
I
e
A
e
A
min
m
PARAMETER
core factor (C1)
effective volume
effective length
effective area
minimum area
mass of set
VALUE
0.604
2440
38.4
63.0
55.4
≈
13
UNIT
mm
−1
mm
3
mm
mm
2
mm
2
g
O 8.55
0
0.3
9.5
0
23.2 0.9
0
5.1
11 0.5
±
0.1
handbook, halfpage
RM8/I
0
19.7 0.8
14.3
0.25
0.4 16.4
10.8 0
0.1
O 17
Dimensions in mm.
0.6
0
MGC068
Fig.1 RM8/I core set.
Core sets for filter applications
Clamping force for A
L
measurements, 30
±10
N.
GRADE
3B46
3D3
A
L
(nH)
5200
±
25 %
250
±3%
315
±5%
400
±5%
1400
±25%
3H3
400
±3%
630
±5%
1000
±10%
3250
±25%
µ
e
≈
2500
≈
121
≈
153
≈
194
≈
675
≈
194
≈
306
≈
485
≈
1560
AIR GAP
(µm)
≈
0
≈
360
≈
270
≈
200
≈
0
≈
200
≈
115
≈
65
≈
0
TYPE NUMBER
RM8/I-3B46
RM8/I-3D3-A250
RM8/I-3D3-A315
RM8/I-3D3-A400
RM8/I-3D3
RM8/I-3H3-A400
RM8/I-3H3-A630
RM8/I-3H3-A1000
RM8/I-3H3
2008 Sep 01
2
Ferroxcube
RM, RM/I, RM/ILP cores and accessories
Core sets for general purpose transformers and power applications
Clamping force for A
L
measurements, 30
±10
N.
GRADE
3C81
A
L
(nH)
100
±3%
160
±3%
250
±3%
315
±3%
400
±3%
4100
±25%
3C90
100
±3%
160
±3%
250
±3%
315
±3%
400
±3%
3300
±25%
3C91
3C94
4100
±25%
100
±3%
160
±3%
250
±3%
315
±3%
400
±3%
3300
±25%
3C95
3C96
3F3
4100
±25%
3000
±25%
100
±3%
160
±3%
250
±3%
315
±3%
400
±3%
3000
±25%
3F35
3F4
2400
±25%
100
±3%
160
±3%
250
±3%
315
±3%
400
±3%
1700
±25%
3F45
1700
±25%
µ
e
≈
49
≈
78
≈
121
≈
153
≈
194
≈
1990
≈
49
≈
78
≈
121
≈
153
≈
194
≈
1600
≈
1990
≈
49
≈
78
≈
121
≈
153
≈
194
≈
1600
≈
1990
≈
1440
≈
49
≈
78
≈
121
≈
153
≈
194
≈
1440
≈
1150
≈
49
≈
78
≈
121
≈
153
≈
194
≈
820
≈
820
TOTAL AIR GAP
(µm)
≈
1100
≈
610
≈
360
≈
270
≈
200
≈
0
≈
1100
≈
610
≈
360
≈
270
≈
200
≈
0
≈
0
≈
1100
≈
610
≈
360
≈
270
≈
200
≈
0
≈
0
≈
0
≈
1100
≈
610
≈
360
≈
270
≈
200
≈
0
≈
0
≈
1100
≈
610
≈
360
≈
270
≈
200
≈
0
≈
0
RM8/I
TYPE NUMBER
RM8/I-3C81-E100
RM8/I-3C81-A160
RM8/I-3C81-A250
RM8/I-3C81-A315
RM8/I-3C81-A400
RM8/I-3C81
RM8/I-3C90-A100
RM8/I-3C90-A160
RM8/I-3C90-A250
RM8/I-3C90-A315
RM8/I-3C90-A400
RM8/I-3C90
RM8/I-3C91
RM8/I-3C94-A100
RM8/I-3C94-A160
RM8/I-3C94-A250
RM8/I-3C94-A315
RM8/I-3C94-A400
RM8/I-3C94
RM8/I-3C95
RM8/I-3C96
RM8/I-3F3-A100
RM8/I-3F3-A160
RM8/I-3F3-A250
RM8/I-3F3-A315
RM8/I-3F3-A400
RM8/I-3F3
RM8/I-3F35
RM8/I-3F4-A100
RM8/I-3F4-A160
RM8/I-3F4-A250
RM8/I-3F4-A315
RM8/I-3F4-A400
RM8/I-3F4
RM8/I-3F45
2008 Sep 01
3
Ferroxcube
RM, RM/I, RM/ILP cores and accessories
Core sets of high permeability grades
Clamping force for A
L
measurements, 30
±10
N.
GRADE
3E27
3E5
3E6
A
L
(nH)
8000
±
25%
12500 +40/−30%
15500 +40/−30%
µ
e
≈
3880
≈
6060
≈
7520
RM8/I
TYPE NUMBER
RM8/I-3E27
RM8/I-3E5
RM8/I-3E6
Properties of core sets under power conditions
B (mT) at
GRADE
H = 250 A/m;
f = 25 kHz;
T = 100
°C
≥315
≥320
≥315
≥320
≥320
≥340
≥315
≥315
≥250
f = 25 kHz;
ˆ
= 200 mT;
B
T = 100
°C
≤
0.56
≤
0.30
−
−
−
−
−
−
−
f = 100 kHz;
ˆ
B = 100 mT;
T = 100
°C
−
≤
0.31
≤
0.17(
1)
≤
0.23
−
≤
0.17
≤
0.27
−
−
CORE LOSS (W) at
f = 100 kHz;
ˆ
B = 200 mT;
T = 25
°C
−
−
−
−
≤
1.44
−
−
−
−
f = 100 kHz;
ˆ
B = 200 mT;
T = 100
°C
−
−
≤
1.0
1)
≤
1.2
≤
1.37
≤
1.0
−
−
−
f = 400 kHz;
ˆ
B = 50 mT;
T = 100
°C
−
−
−
−
−
≤
0.43
≤
0.47
≤
0.25
−
3C81
3C90
3C91
3C94
3C95
3C96
3F3
3F35
3F4
Properties of core sets under power conditions (continued)
B (mT) at
GRADE
H = 250 A/m;
f = 25 kHz;
T = 100
°C
≥340
≥315
≥315
≥250
≥250
f = 500 kHz;
ˆ
B = 50 mT;
T = 100
°C
≤
0.9
−
≤
0.37
−
−
f = 500 kHz;
ˆ
B = 100 mT;
T = 100
°C
−
−
≤
2.6
−
−
CORE LOSS (W) at
f = 1 MHz;
ˆ
B = 30 mT;
T = 100
°C
−
−
−
≤
0.74
≤
0.56
f = 1 MHz;
ˆ
B = 50 mT;
T = 100
°C
−
−
−
−
≤
2.1
f = 3 MHz;
ˆ
B = 10 mT;
T = 100
°C
−
−
−
≤
1.2
≤
1.0
3C96
3F3
3F35
3F4
3F45
Note
1. Measured at 60
°C.
2008 Sep 01
4
Ferroxcube
RM, RM/I, RM/ILP cores and accessories
COIL FORMER
General data
PARAMETER
Coil former material
Pin material
Maximum operating temperature
Resistance to soldering heat
Solderability
SPECIFICATION
RM8/I
polybutyleneterephthalate (PBT), glass-reinforced, flame retardant
in accordance with
“UL 94V-0”;
UL file number E45329(R)
copper-tin alloy (CuSn), tin (Sn) plated
155
°C,
“IEC 60085”,
class F
“IEC 60068-2-20”,
Part 2, Test Tb, method 1B, 350
°C,
3.5 s
“IEC 60068-2-20”,
Part 2, Test Ta, method 1
10.6 0
−0.15
3.1
5.08
3.81
3.81
3.81
3.81
0.65
(8.6 min.)
1.1
2.5
0.3
2.54
handbook, full pagewidth
20.32 8.7
+0.2
0
16 23.4
∅16.9
0
∅9.95
0
−0.2
−0.1
∅0.6
3.2
23.3
4.3
1
+0.15
0
CBW524
Dimensions in mm.
Fig.2 RM8/I coil former (DIL).
Winding data and area product for RM8/I coil former (DIL)
NUMBER OF
SECTIONS
1
AVERAGE
LENGTH OF
TURN
(mm)
42
WINDING
AREA
(mm
2
)
30.9
WINDING
WIDTH
(mm)
8.6
AREA
PRODUCT
Ae x Aw
(mm
4
)
1950
TYPE NUMBER
CPV-RM8/I-1S-12PD
2008 Sep 01
5