ISDN MAGNETICS
UPO Interface Transformers
TM00208
•
Operates as a pulse transformer at 384 Kbps in ISDN U interface applications Qualified per Bellcore TR-TSY-000357-1
• •
Primary winding can withstand 70mA of direct current Minimum interwinding breakdown voltage of 1500 Vrms
•
ELECTRICAL SPECIFICATIONS at 25° C
DCR Ω max Interwinding Capacitance2 pF max With terminals 7 & 9 connected 60
Part Number
Turns Ratio ± 2%
Primary Inductance1 mH min
Leakage Inductance2 µH max Pri
Sec
2718BD2
1CT : 1.25
2.5
15
3.6
3.4
2718BG2
1 2
1CT : 2
2.1
11.5
2.7
6.1
60
Measured at 1 kHz, 0.1 Vac Measured at 100 kHz, 0.01 Vac
SCHEMATIC
Compatible Transceiver ICs Part Number IC Mfr IC Part Number
10 1
2718BD2
Siemens
PEB2095
7 CT 9
2718BG2
Siemens
PEB2096
5
6 Primary Secondary
©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T2-19
ISDN MAGNETICS
TM00208
UPO Interface Transformers
MECHANICAL
2718BD2 2718BG2
0.56 [14.22] max
0.110 [2.79]
0.023 [0.584] Sq typ (Phosphor Bronze, Solder-Coated) 0.59 [14.99] max 0.175 [4.45]
+ +5
0.32 [8.13] max
6 7 8 9 10 +
+
0.61 [15.49] max 0.100 [2.54] centers
–
4 3 2
0.510 [12.95]
+1
Terminal 1 Identifier
0.450 [11.43]
Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters].
©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
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 G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com
T2-20
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