ISDN MAGNETICS
Dual S Interface Transformers
TM9938
•
•
Low profile 0.175" package
Compatible with PC card applications
•
•
•
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
Distributed
Parallel
Capacitance
pF max
Primary
Inductance*
mH min
Leakage
Inductance
µH max
Interwinding
max
Turns Ratio
Part Number
Capacitance
± 2%
pF max
Pri
Sec
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
6.0
6.0
6.0
6.0
6.0
10.5
8.5
8.5
8.5
6.0
100
100
100
100
100
100
100
100
100
100
3.75
2.50
5.00
* Measured at 10 kHz, 0.5 Vac
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SCHEMATIC
Compatible Transceiver ICs
IC Manufacturer IC Part Number
16
1
Part Number
2800A
2800B
2800C
2800D
2800E
T7250C
T7256
T7234
2800A
2800B
Lucent
Lucent
2
3
15
14
T7901
T7903
PEB2081
PEB2085
PEB2086
4
5
13
12
Siemens
Mitel
T2
MT8930
2800C
National
Semiconductor
TP3420
TP3421
6
7
11
10
Alcatel
AMD
MTC-2072
79C30A
79C32A
2800D
2800E
8
9
MC145474
MC145475
Motorola
Primary
Secondary
©1999 Bel Fuse Inc. 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
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