Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
10/100BASE-T LAN MAGNETICS
2000 Bel Fuse Inc. Specifications subject to change without notice. 12.00
Single Port Transformer Modules
ELECTRICAL SPECIFICATIONS at 25 C
SCHEMATIC
S558-5999-K8
Line Side
Chip Side
TX
1CT : 1CT
RX
1CT : 1CT
1
2
3
6
7
8
TXCT
TX+
TX-
RX-
RX+
RXCT
16
15
14
11
10
9
TXCT
TX+
TX-
RX+
RX-
RXCT
r
e
b
m
u
N
t
r
a
P
o
i
t
a
R
s
n
r
u
T
n
o
i
t
r
e
s
n
I
s
s
o
L
x
a
m
B
d
s
s
o
L
n
r
u
t
e
R
n
i
m
B
d
o
t
n
o
m
m
o
C
l
a
i
t
n
e
r
e
f
f
i
D
e
d
o
M
n
o
i
t
c
e
j
e
R
n
i
m
B
d
o
t
n
o
m
m
o
C
n
o
m
m
o
C
e
d
o
M
n
o
i
t
c
e
j
e
R
n
i
m
B
d
k
l
a
t
s
s
o
r
C
n
i
m
B
d
X
T
X
R
o
t
z
H
k
0
0
1
z
H
M
0
0
1
o
t
z
H
k
0
0
1
z
H
M
0
3
o
t
z
H
M
0
3
z
H
M
0
6
o
t
z
H
M
0
6
z
H
M
0
8
z
H
M
0
0
1
o
t
z
H
k
0
0
1
z
H
M
1
z
H
M
0
3
z
H
M
0
6
z
H
M
0
0
1
8
K
-
9
9
9
5
-
8
5
5
S
T
C
1
:
T
C
1
T
C
1
:
T
C
1
0
.
1
-
6
1
-
g
o
l
0
2
-
6
1
)
z
H
M
0
3
/
f
(
0
1
-
0
4
-
0
3
-
5
6
-
5
5
-
5
4
-
5
3
-
8
Y
-
9
9
9
5
-
8
5
5
S
T
C
1
:
T
C
1
T
C
1
:
T
C
1
0
.
1
-
6
1
-
g
o
l
0
2
-
6
1
)
z
H
M
0
3
/
f
(
0
1
-
8
3
-
0
3
-
0
6
-
0
5
-
0
4
-
0
3
-
Meets all relevant IEEE 802.3 requirements
Appropriate for use in cable modem applications
Low profile, surface mount packaging rated to 225 C
peak IR reflow temperature
Small form factor for board layout efficiency
Operating temperature 0 to 70 C
Storage temperature -40 to +100 C
Minimum interwinding breakdown voltage of 1500 Vrms
S558-5999-Y8
Line Side
Chip Side
TX
1CT : 1CT
RX
1CT : 1CT
1
2
3
6
7
8
TXCT
TX+
TX-
RX-
RX+
RXCT
16
15
14
11
10
9 TXCT
TX+
TX-
RX+
RX-
RXCT
CORPORATE
Bel Fuse Inc.
198 Van Vorst Street
Jersey City, NJ 07302
Tel
201-432-0463
Fax
201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel
852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel
44-1772-556601
Fax 44-1772-888366
www.belfuse.com
2000 Bel Fuse Inc. Specifications subject to change without notice. 12.00
10/100BASE-T LAN MAGNETICS
Single Port Transformer Modules
MECHANICAL
S558-5999-K8
S558-5999-Y8
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
0.500
[12.70]
max
0.375
[9.52]
max
0.285
[7.24]
max
0.018 0.002
[0.46 0.05]
0.225
[5.73]
max
0.350 0.001
[8.89 0.25]
0.050
[1.27]
0.010
[0.25]
max
0.012
[0.30]
max
0.035
[0.88]
4 nom
Suggested PCB Pad Layout
0.425
[10.80]
0.050
[1.27]
0.070
[1.78]
0.025
[0.64]
0.004 [0.10]
PDF 
ZIP