2798A Datasheet, PDF (1/2 Pages) Bel Fuse Inc. – ISDN MAGNETICS Dual S Interface Transformers

ISDN MAGNETICS
Dual S Interface Transformers
TM9937
• Meet requirements for pulse template and impedance • Minimum interwinding breakdown voltage of 1500 Vrms
template according to ITU-T (CCITT I.430)
• Operating temperature range 0° C to 85° C
• UL and CSA approved
• Qualified per Bellcore TR-TSY-000357-1
ELECTRICAL SPECIFICATIONS at 25° C
Part Number
Turns Ratio
± 2%
Primary
Inductance
mH min
Leakage
Inductance
µH max
2798A
1.0 : 2.5
22.0
5.0
2798B
1.0 : 2.0
22.0
5.0
2798C
1.0 : 2.0
22.0
3.75
2798D
1.0 : 2.0
22.0
2.5
2798E
1.0 : 1.0
22.0
5.0
DCR
Ω
max
Pri
Sec
3.5
7.5
3.5
6.0
2.25
4.45
3.5
6.0
3.5
3.5
Interwinding
Capacitance
pF max
100
100
100
100
100
Distributed
Parallel
Capacitance
pF max
100
100
80
100
40
Part Number
2798A
2798B
2798C
Compatible Transceiver ICs
IC Manufacturer
Lucent
IC Part Number
T7250C
T7256
T7234
Lucent
T7901
T7903
Siemens
PEB2081
PEB2085
PEB2086
Mitel
MT8930
SCHEMATIC
2798A
2798B
2798C
2798D
2798E
T1
1
16
2
15
3
14
4
13
T2
5
12
2798D
National
Semiconductor
AMD
TP3420
TP3421
79C30A
79C32A
6
11
7
10
2798E
Motorola
MC145474
MC145475
8
Primary
9
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 [phone] • Fax [phone] • www.belfuse.com
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