
Corporate Office
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302-4496
Tel: 201-432-0463
Fax: 201-432-9542
E-Mail: BelFuse@belfuse.com
Internet: http://www.belfuse.com
Far East Office
Bel Fuse Ltd.
8F/8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel: 852-2328-5515
Fax: 852-2352-3706
European Office
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Preston PR1 8UD
Lancashire, U.K.
Tel: 44-1772-556601
Fax: 44-1772-888366
defining a degree of excellence
0.03(0.76)
0.20(5.08)
0.500(12.7)
0.10(2.54)
0.04(1.02)
0.339
(8.60)
0.100(2.54)
0.285(7.25)
0.433(11.0)
0.366
(9.30)
SUGGESTED
PLACEMENT
MECHANICALS
Primary2
1
4
3
6
Secondary
1CT : 1
SCHEMATIC
Bel takes this opportunity to supply a new
Pulse Transformer for Digital Data Service.
Our manufacturing processes assure quality
and reliability in every component.
* Designed to work compatibly with the
Level One LXT441 Transceiver.
* Designed for SW36 and DDS.
All dimensions are in inches(mm).
Dimension tolerance is +/- 0.01 unless
otherwise stated.
Part
Number
S553-3855-01
60Hz to
1000Hz
60
40
1000Hz to
4000Hz
15kHz to
2MHz
40
Longitudinal Balance
(dB) Typ.
DC Bias
Current
(mA) Min
50
1500
Dieletric
Strength
(VAC)
Pins (3-1) to
Pins (4-6)
Part
Number
Pins
(3-1):(4-6)
Turns Ratio
+/- 2%
Primary
Inductance
(mH) Min
Pins (3-1)
40
Leakage
Inductance
(
μ
H) Max
Pins (3-1)
40
Capacitance
(pF) Max
Pins (3 to 4)
Return Loss
(dB) Typ.
vs. Line 2
Insertion
Loss (dB)
Typ.
10kHz
ELECTRICALS
@ 25
O
C
100Hz-112kHz
+/- 1.0
Frequency
Response
(dB)
50
1.50
S553-3855-01
1CT:1
6
DCR
(ohms)
+/- 10%
Pins (3-1) &
Pins (4-6)
1kHz
32
0.500(12.7)
PULSE TRANSFORMERS
S553-3855-01
TM0023
T123