HIGH FREQUENCY MAGNETICS
DS3/E3/STS-1 Transformers
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Optimized for line transceivers operating at E3, DS3
or STS-1 rates: 34.368 Mb/s, 44.736 Mb/s, 51.84 Mb/s
S554-6500-25 and S554-6500-26 are surface mount,
industrial temperature replacements for S554-3184-00
and S554-3184-02 transformers respectively
Meet ITU-T G.703 return loss from -40° to +85° C
from 860 kHz to 51.55 MHz
UL 1950 approved: file number E150991
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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
TM02130
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ELECTRICAL SPECIFICATIONS at 25° C
Turns Ratio
±2%
Part Number
Pri : Sec
S554-6500-25
S554-6500-26
S554-6500-30
1:1
1 : 2CT
1CT : 1CT
Primary
Inductance
at 100 kHz
25° C
µH min
80
80
80
-40° C
µH min
40
40
40
Leakage
Inductance
at 1 MHz
µH max
0.09
0.09
0.10
Capacitance
C w/w
Return Loss at 1.72 MHz
75
Ω
Application
1
25° C
dB typ
25
25
25
-40 to +85° C
dB min
18
18
18
pF max
10
10
10
1. Terminated in 75
Ω
for 1 : 1 ratio and 300
Ω
for 1 : 2 ratio
SCHEMATICS
S554-6500-25
S554-6500-26
S554-6500-30
1:1
4
3
4
1 : 2CT
3
2
4
5
6
Primary
1CT : 1CT
3
2
1
Secondary
6
Primary
1
Secondary
6
Primary
1
Secondary
©2002 Bel Fuse Inc. Specifications subject to change without notice. 04.02
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 1
HIGH FREQUENCY MAGNETICS
TM02130
DS3/E3/STS-1 Transformers
MECHANICAL
S554-6500-25
S554-6500-26
S554-6500-30
0.300
[7.62]
max
0.030 [0.76]
0.100
[2.54]
0.350 [8.89] 0.285
0.375 [9.52] [7.24]
max
0.425
[10.80]
0.070
[1.78]
0.018 +0.002
[0.46 +0.05]
0.100 [2.54]
Suggested PCB Pad Layout
0.225
[5.73] max
0.003
[0.08]
min
0.008 - 0.012
[0.20 - 0.30]
4˚
0.004 [0.10]
0.200
[5.08]
0.035 [0.89]
Dimensions are in inches [millimeters].
Standard dimension tolerance is ±0.005 [0.13] unless otherwise noted.
Tape and Reel Packaging
16 mm wide by 12 mm pitch; 13 inch OD, 4 inch ID
500 modules per reel, maximum
Meets ANSI/EIA 481-2 Carrier Tape Standards - JEDEC SO Package
©2002 Bel Fuse Inc. Specifications subject to change without notice. 04.02
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
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