HIGH FREQUENCY MAGNETICS
T1/E1 Octal Transformer Modules
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Optimized for all Dallas 3.3V devices and Intel LXT380,
LXT381 devices
Eight transformers in one surface mount package
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Two modules:
S553-6500-B8 with transformers and IC-side surge
protection devices
S553-6500-B9 with transformers only
Meets ITU-T G.703 return loss from -40° to +85° C
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
Reliability testing: Shock, vibration, temperature cycling,
temperature - humidity - bias
Interwinding breakdown voltage: 1500 Vrms min
UL 1950 approved: file number E150991
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Operating temperature range -40° to +85°C
Meets IEC 695, 2-2 flammability requirements
TM01122
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ELECTRICAL SPECIFICATIONS at 25° C
Primary
Inductance
at 10 kHz
mH min
TXI : TXO
S553-6500-B8
S553-6500-B9
1:2
1:2
RXI : RXO
1:1
1:1
TXI
1.5
1.5
RXI
1.8
1.8
Leakage
Inductance
at 1 MHz
µH max
TXI
0.3
0.3
RXO
0.5
0.5
TXI
0.6
0.6
TXO
1.2
1.2
RXI
0.6
0.6
RXO
0.6
0.6
35
35
DCR
Ω
max
Return Loss at 102 kHz
120
Ω
Application
1
Interwinding
Capacitance
pF max
25° C
dB typ
TX
19
19
RX
30
30
-40 to +85° C
dB min
TX
18
18
RX
19
19
Part Number
Turns Ratio
±2%
1. Terminated in 23.2
Ω
for TX and 120
Ω
for RX
SCHEMATIC
IC Side
1 TXI+
1,2 3.3V
1 TXI-
1
2
3
S553-6500-B8
Line Side
1:2
40 1 TXO+
39
S553-6500-B9
IC Side
1 TXI+
1
2
1 TXI-
3
1:1
1:2
Line Side
40 1 TXO+
39
38 1 TXO-
37 1 RXI+
36 1 RXI-
1:2
35 2 TXO+
34
33 2 TXO-
1:1
32 2 RXI+
31 2 RXI-
1:2
30 3 TXO+
29
28 3 TXO-
1:1
27 3 RXI+
26 3 RXI-
25 4 TXO+
24
1:1
23 4 TXO-
22 4 RXI+
21
4 RXI-
1 RXO+ 4
1 RXO-
2 TXI+
1,2 GND
2 TXI-
5
6
7
8
S
U
R
G
E
P
R
O
T
E
C
T
I
O
N
D
E
V
I
C
E
S
38 1 TXO-
1:1
37 1 RXI+
36 1 RXI-
1:2
35 2 TXO+
34
33 2 TXO-
1:1
32 2 RXI+
31 2 RXI-
1:2
30 3 TXO+
29
28 3 TXO-
1:1
27 3 RXI+
26 3 RXI-
25 4 TXO+
24
23 4 TXO-
1:1
22 4 RXI+
21
4 RXI-
1 RXO+ 4
1 RXO-
2 TXI+
5
6
7
2 TXI-
8
2 RXO+ 9
2 RXO- 10
3 TXI+
3,4 3.3V
11
12
2 RXO+ 9
2 RXO- 10
3 TXI+
11
12
3 TXI- 13
3 RXO+ 14
3 RXO- 15
4 TXI+
16
17
4 TXI-
18
3 TXI- 13
3 RXO+ 14
3 RXO- 15
4 TXI+
3,4 GND
4 TXI-
16
17
18
1:2
1:2
4 RXO+ 19
4 RXO-
20
4 RXO+ 19
4 RXO-
20
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 05.05
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
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