Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
HIGH FREQUENCY MAGNETICS
©2007 Bel Fuse Inc. Specifications subject to change without notice. 08.07
TM01109
page 1
T1/E1 Octal Transformer Modules
SCHEMATIC
ELECTRICAL SPECIFICATIONS at 25° C
S553-6500-A7
• Optimized for PMC-Sierra PM4354 Quad COMET
• Eight transformers in one surface-mount package
• Two modules:
S553-6500-A7 with eight transformers
S553-6500-A8 with eight transformers and IC-side
surge protection devices
• Tight ratio tolerance assists impedance matching
• Meets ITU-T G.703 return loss from -40° to +85° C
• Operating temperature range -40° to +85°C
• Meets IEC 695, 2-2 flammability requirements
• 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: S553-6500-A7 file number E150991
S553-6500-A8 pending
1. Inductance at 10 kHz, leakage inductance at 1 MHz
2. Terminated in 25.4 Ω for TX and 18.2 Ω for RX
S553-6500-A8
1
2
3
38
1 : 2.42
16
5
8
9
12
13
14
15
1 TXI+
1 TXI-
1 RXO+
1 RXO-
2 TXI+
2 TXI-
2 RXO+
2 RXO-
3 TXI+
3 TXI-
3 RXO+
3 RXO-
4 TXI+
4 TXI-
4 RXO+
4 RXO-
31
30
36
35
33
32
21
29
26
25
27
28
1 TXO+
1 TXO-
1 RXI+
1 RXI-
2 TXO+
2 TXO-
2 RXI+
2 RXI-
3 TXO+
3 TXO-
3 RXI+
3 RXI-
4 TXO+
4 TXO-
4 RXI+
4 RXI-
IC Side
Line Side
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
4
6
7
10
11
17
18
19
20
22
23
24
34
37
40
39
1
2
3
38
1 : 2.42
16
5
8
9
12
13
14
15
1 TXI+
1 TXI-
1 RXO+
1 RXO-
2 TXI+
2 TXI-
2 RXO+
2 RXO-
3 TXI+
3 TXI-
3 RXO+
3 RXO-
4 TXI+
4 TXI-
4 RXO+
4 RXO-
31
30
36
35
33
32
21
29
26
25
27
28
1 TXO+
1 TXO-
1 RXI+
1 RXI-
2 TXO+
2 TXO-
2 RXI+
2 RXI-
3 TXO+
3 TXO-
3 RXI+
3 RXI-
4 TXO+
4 TXO-
4 RXI+
4 RXI-
IC Side
Line Side
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
1 : 2.42
4
6
7
10
11
17
18
19
20
22
23
24
34
37
40
39
3,4 GND
3,4 3.3V
1,2 GND
1,2 3.3V
S
U
R
G
E
P
R
O
T
E
C
T
I
O
N
D
E
V
I
C
E
S
rebmuNtraP
oitaRsnruT
%2±
eniL:CI
yramirP
ecnatcudnI
1
nimHµ
egakaeL
ecnatcudnI
1
xamHµ
RCD
ΩΩ
Ω
ΩΩ
xam
gnidniwretnI
ecnaticapaC
xamFp
zHk201tassoLnruteR
021 ΩΩ
Ω
ΩΩ noitacilppA
2
C°52
pytBd
C°58+ot04-
nimBd
XT XR ediSCI ediSCI ediSCI ediSeniL XT XR XT XR
7A-0056-355S24.2:124.2:10593.06.03.15381727142
8A-0056-355S24.2:124.2:10593.06.03.15381727142
