Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
0811-2X4R-28
10/100Base-TX MagJack
2 x 4
INTEGRATED CONNECTOR MODULES
ELECTRICAL SPECIFICATIONS AT 25 C
page 1
8-port shielded RJ-45 connector with integrated
10/100 magnetics
Design supports AutoMDIX applications
Compatible with a variety of 10/100 transceiver ICs
Operating temperature 0 to +70 C
Storage temperature -40 to +85 C
Complies with IEEE standards and all 10/100 Ethernet
specifications including 350H with 8mA DC bias
Highly integrated design conserves valuable board space
Minimum interwinding breakdown voltage of 1500 Vrms
Adaptable, modular design provides higher reliability
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
o
t
z
H
K
0
0
1
z
H
M
0
0
1
o
t
z
H
M
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
0
0
1
o
t
z
H
k
0
0
1
1
.
1
-
8
1
-
g
o
l
0
2
-
8
1
)
z
H
M
0
3
/
f
(
2
1
-
0
4
-
0
3
-
5
3
-
SCHEMATIC
0811-2X4R-28
Pin
1CT : 1
1CT : 1
1
4
2
3
7
6
RD+
RCT
RD-
TD+
TCT
TD-
GND 8
Shield
RJ-45
1
2
3
4
5
6
7
8
RX+
RX-
TX+
TX-
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
0811-2X4R-28
10/100Base-TX belStackTM
INTEGRATED CONNECTOR MODULES
page 2
MECHANICAL
0811-2X4R-28
1.
Jack cavity conforms to FCC rules and regulations, part 68, subpart F.
Notes
Plastic Housing
Thermoplastic, flammability rating UL 94V-0
Contacts
50 micro-inch hard gold plating
Pins
Tin-coated copper wire, DIA 0.018" [0.46]
Solderability
Per MIL Std. 202, Method 208
Metal Shield
Nickel plated copper alloy(all ground leads
are solder dipped)
1.130
[28.70]
0.150
[3.81]
0.125
[3.18]
1.004
[25.50]
0.425 [10.80]
Solder dipped
ground lead (4X)
Port 2
Port 1
0811-2X4R-28
Port 8
Port 7
2.330 [59.18]
1
2.100 [53.34]
0.550 [13.97]
Typical
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.010 [0.25]
unless otherwise noted.
CORPORATE
Bel Fuse Inc.
206 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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
0811-2X4R-28
10/100Base-TX MagJack
2 x 4
INTEGRATED CONNECTOR MODULES
page 3
PAD LAYOUT
0811-2X4R-28
2.050 [52.07]
1.500 [38.10]
0.950 [24.13]
0.400 [10.16]
0.100 [2.54] typ
0.050 [1.27]
typ
0.062
[1.57]
4 places
0.610
[15.49]
0.450
[11.43]
0.180
[4.57]
0.128 [3.25]
2 places
0.035 [0.89]
typical
PC Board Layout Viewed from Component Side
R0.030 [R0.76]
2 places
0.110 [2.79]
2 places
0.290 [7.37]
2 places
2.100 [53.34]
Position 8
Lowerdeck Typical
Position 1
Lowerdeck Typical
0.100 [2.54]
0.160 [4.06]
0.100 [2.54]
0.250 [6.35]
0.200 [5.08]
Position 8
Upperdeck Typical
Position 1
Upperdeck Typical
1.030 +0.010/-0.005
[26.16 +0.25/-0.13]
2.365 +0.010/-0.005
[60.07 +0.25/-0.13]
Metal Panel
0.015
[0.38]
PCB
0.085 0.010
[2.16 0.25]
Suggested Panel Opening
PDF 
ZIP