Ferrites and accessories
RM 8, RM 8 LP
Core and accessories
Series/Type:
Date:
B65811, B65812
May 2017
The following products presented in this data sheet are being withdrawn.
Ordering Code
B65812A5000X000
Substitute Product
Date of Withdrawal
2018-06-08
Deadline Last
Orders
2018-09-14
Last Shipments
2018-12-14
For further information please contact your nearest EPCOS sales office, which will also support you in selecting a suitable substitute. The
addresses of our worldwide sales network are presented at www.epcos.com/sales.
EPCOS AG 2017. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS’ prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
RM 8
Core and accessories
Individual parts
Adjusting screw
Part no.
B65812
Page
9
Core
Clamps
B65811
B65812
3
8
Insulating washer 1
B65812
8
Coil former
B65812
5
Core
Threaded sleeve (glued-in)
Insulating washer 2
B65811
3
B65812
8
Example of an assembly set
Also available:
Coil former for
SMPS transformers
Coil former for
power applications
RM 8 low-profile:
Core
Clamp
Insulating washers 1 + 2
B65812
B65812
6
7
B65811P
B65812
B65812
10
11
11
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
5/17
RM 8
Core
■
To IEC 62317-4
■
Cores without center hole
B65811
for transformer applications
■
Delivery mode: sets
Magnetic characteristics
(per set)
with
center hole
Σl/A
l
e
A
e
A
min
V
e
0.68
35.1
52
—
1825
without
center hole
0.59
38
64
55
2430
mm
–1
mm
mm
2
mm
2
mm
3
Approx. weight
(per set)
m
10.7
12
g
Gapped
(A
L
values/air gaps examples)
Material
A
L
value
nH
N48
250
±
315
±
400
±
630
±
3%
3%
3%
5%
s
approx.
mm
0.23
0.17
0.14
0.10
0.49
0.24
0.11
0.04
0.30
0.18
134
169
215
338
76
118
298
756
118
189
μ
e
Ordering code
1)
-D with center hole
-F with threaded sleeve
-J without center hole
B65811+0250A048
B65811+0315A048
B65811+0400A048
B65811+0630J048
B65811J0160A041
B65811J0250J041
B65811J0630J041
B65811J1600K041
B65811J0250A087
B65811J0400A087
N41
160
±
3%
250
±
5%
630
±
5%
1600
±10%
250
±
3%
400
±
3%
N87
1) Replace the + by the code letter “F” or “D” for the required version. Standard version is “D”.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
5/17
RM 8
Core
Ungapped
Material
A
L
value
nH
N48
N30
T38
N49
N87
N97
N41
N95
2900 +30/–20% 1550
5700 +30/–20% 2690
12500 +40/–30% 5910
2200 +30/–20% 1040
3300 +30/–20% 1560
3300 +30/–20% 1560
4100 +30/–20% 1940
4100 +30/–20% 1940
< 0.37 ( 50 mT, 500 kHz, 100
°C)
< 1.20 (200 mT, 100 kHz, 100
°C)
< 1.00 (200 mT, 100 kHz, 100
°C)
< 0.37 (200 mT, 25 kHz, 100
°C)
< 1.10 (200 mT, 100 kHz, 100
°C)
μ
e
P
V
W/set
Ordering code
-D with center hole
-J without center hole
B65811D0000R048
B65811J0000R030
B65811J0000Y038
B65811J0000R049
B65811J0000R087
B65811J0000R097
B65811J0000R041
B65811J0000R095
B65811
Other A
L
values/air gaps and materials available on request ─ see Processing remarks on page 12.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
5/17
RM 8
Accessories
Coil former, squared pins
GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155
°C),
color code black
Sumikon PM 9630
®
[
E41429 (M)
]
, SUMITOMO BAKELITE CO LTD
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235
°C,
2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350
°C,
3.5 s
Winding:
see Processing notes, 2.1
For matching clamp and insulating washers see page 8.
Sections
1
A
N
mm
2
30
l
N
mm
42
A
R
value
μΩ
47
Pins
5
8
12
5
8
12
Ordering code
B65812N1005D001
B65812N1008D001
B65812N1012D001
B65812N1005D002
B65812N1008D002
B65812N1012D002
Version
5 pins
8 pins
Pins omitted
3, 4, 6, 7, 9, 10, 12
3, 4, 9, 10
Material:
B65812
2
28.4
42
50
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
5/17
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