ISDN MAGNETICS
Dual S Interface Transformers
•
•
Low profile 0.175" package
Compatible with PC card applications
•
•
•
TM9938
Minimum interwinding breakdown voltage of 1500 Vrms
Qualified per Bellcore TR-TSY-000357-1
UL and CSA approved
ELECTRICAL SPECIFICATIONS at 25° C
DCR
Ω
max
Pri
2800A
2800B
2800C
2800D
2800E
1.0 : 2.5
1.0 : 2.0
1.0 : 2.0
1.0 : 2.0
1.0 : 1.0
22.0
22.0
22.0
22.0
22.0
4.75
5.0
3.75
2.50
5.00
6.0
6.0
6.0
6.0
6.0
Sec
10.5
8.5
8.5
8.5
6.0
100
100
100
100
100
Part Number
Turns Ratio
± 2%
Primary
Inductance*
mH min
Leakage
Inductance
µ
H max
Interwinding
Capacitance
pF max
Distributed
Parallel
Capacitance
pF max
100
100
100
100
100
* Measured at 10 kHz, 0.5 Vac
Compatible Transceiver ICs
Part Number
IC Manufacturer
IC Part Number
T7250C
T7256
T7234
T7901
T7903
PEB2081
PEB2085
PEB2086
MT8930
TP3420
TP3421
MTC-2072
79C30A
79C32A
MC145474
MC145475
SCHEMATIC
1
2800A
2800B
2800C
2800D
2800E
T1
16
2800A
Lucent
2
3
15
14
2800B
Lucent
4
T2
5
13
Siemens
Mitel
2800C
National
Semiconductor
Alcatel
12
6
7
11
10
2800D
AMD
2800E
Motorola
8
Primary
©1999 Bel Fuse Inc.
9
Secondary
Specifications subject to change without notice. 06.99
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
T328
ISDN MAGNETICS
TM9938
Dual S Interface Transformers
MECHANICAL
0.945 [24.00] max
16 15 14 13 12 11 10 9
2800A
2800B
2800C
2800D
2800E
Terminal 1 ID
1
2
3
4
5
6
7
8
0.100[2.54] typ
0.175
[4.44]
max
0.600
[15.24]
0.715 [18.16]
+0.010 [0.25]
– 0.005 [0.13]
Note: Unless otherwise specified, dimensions
are nominal and in inches [millimeters].
0.065
[1.65]
Terminal Pad
Board
Cutout
0.615
[15.62]
0.745
[18.92]
0.107 [2.72] typ
0.060 [1.52] typ
0.100 [2.54] typ
0.975 [24.76]
0.050
[1.27]
typ
Suggested PCB Pad Layout
©1999 Bel Fuse Inc.
Specifications subject to change without notice. 06.99
CORPORATE
Bel Fuse Inc.
198 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 F23, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
T329
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