HIGH FREQUENCY MAGNETICS
T1/E1 OctalTransformer Module
TM02128
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Optimized for Intel LXT3108 eight channel device
Eight transformers in one surface mount package
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Operating temperature range -40° to +85°C
Meets IEC 695, 2-2 flammability requirements
Four transformers have center taps to facilitate line
driver circuitry
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
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Meets ITU-T G.703 return loss from -40° to +85° C
from 51 kHz to 3.072 MHz
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Reliability testing: Shock, vibration, temperature cycling,
temperature - humidity - bias
UL 1950 approved: file number E150991
Interwinding breakdown voltage: 1500 Vrms min
ELECTRICAL SPECIFICATIONS at 25° C
Primary
Inductance
at 10 kHz
Leakage
Inductance
at 1 MHz
DCR
Ω
max
Turns Ratio
±2%
Capacitance
pF max
Part Number
IC : Line
mH min
µH max
IC
Line
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
S553-6500-F2
1CT : 1
1 : 1
1.8
1.8
0.5
0.5
0.7
0.7
0.7
0.7
35
Return Loss at 102 kHz
SCHEMATIC
120Ω Application1
S553-6500-F2
Line Side
IC Side
25° C
dB typ
-40 to +85° C
dB min
1 : 1
1 RXI+
40
1
1 RXO+
1 RXO-
1 TXI+
2
3
4
39 1 RXI-
TX
RX
TX
RX
1CT : 1
38
37
1 TXO+
1 TXICT
31
31
19
19
1 TXO-
2 TXO+
36
35
5
1 TXI-
2 TXI+
1CT : 1
6
1. Terminated in 120 Ω on IC side
2 TXICT
7
34
33 2 TXO-
8
2 TXI-
1 : 1
1 : 1
2 RXO+
9
32
2 RXI-
10
2 RXI-
3 RXI+
31
30
2 RXO-
3 RXO+
11
29 3 RXI-
12
13
3 RXO-
3 TXI+
1CT : 1
3 TXO+
28
27
14
15
16
3 TXICT
3 TXI-
3 TXO-
4 TXO+
26
25
1CT : 1
1 : 1
4 TXI+
24
17
4 TXICT
4 TXI-
23 4 TXO-
4 RXI+
18
19
22
4 RXO+
4 RXO- 20
21 4 RXI-
©2002 Bel Fuse Inc. Specifications subject to change without notice. 02.02
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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