HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Shielded Transformers
•
•
Designed for DS1, DS1C, and CEPT applications
Electrostatic shield provides improved longitudinal
signal suppression and EMI reduction
Maximum inductance unbalance of center-tapped
windings is 0.1%
•
•
•
•
•
Operating temperature range: -40° C to +85° C
Meets IEC 695, 2-2 flammability requirements
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
Reliability testing: Shock, vibration, temperature cycling,
temperature - humidity - bias
TM00123
ELECTRICAL SPECIFICATIONS at 25° C
Turns Ratio
± 2%
DCR
Ω
max
Pri
4.5
4.5
3.15
3.15
0.92
0.92
0.92
0.92
4.5
4.5
6.5
6.5
1.1
1.1
2.5
2.5
3.7
3.7
1.9
1.9
0.75
0.75
0.83
0.83
Sec
7.2
7.2
4.4
4.4
1.05
1.05
1.43
1.43
10
10
5
4
5
4
10
10
5
4
5
4
Minimum
Interwinding
Breakdown
Voltage
Vrms
1000
1000
850
850
1000
1000
850
850
Part Number
1
Primary
Inductance
2
mH min
Leakage
Inductance
µ
H max
Interwinding
Capacitance
3
pF max
Non-Shielded
Version
Pri : Sec
2741B
2741B2
2741G
2741G2
2741C
2741C2
2741H
2741H2
1CT : 2CT
1CT : 2CT
1CT : 2CT
1CT : 2CT
1 : 1.36CT
1 : 1.36CT
1 : 1.37CT
1 : 1.37CT
2745AF2
2745AF2
2745AF2
2745AF2
2745CA2
2745CA2
2745CA2
2745CA2
1. A "2" suffix indicates short terminals (see mechanical section)
2. measured at 10 kHz, 0.1 Vac
3. with terminal 1 grounded
4. There is an internal connection to terminal 8; do not use
2741C
2741C2
2741H
2741H2
SCHEMATICS
2741B
2741B2
2741G
2741G2
S
2
3
S
4
3
2
1
Primary
Secondary
5
6
7
6
CT
4
7
Primary
1
5
Secondary
©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
T1-51
HIGH FREQUENCY MAGNETICS
TM00123
T1/E1 Through Hole Shielded Transformers
MECHANICAL
2741B
2741C
2741G
2741H
2741B2
2741C2
2741G2
2741H2
0.56 (14.22)
MAX
0.46 (11.68)
MAX
0.56 (14.22)
MAX
0.46 (11.68)
MAX
TERMINAL 1 IDENTIFIER
0.35 (8.89)
MAX
TERMINAL 1 IDENTIFIER
0.155
(3.94)
0.100
(2.54)
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.35 (8.89)
MAX
1 2 3 4
0.250
(6.35)
8
7 6
5
0.110 (2.79)
±0.010 (0.25)
0.100
(2.54)
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
1 2 3 4
0.250
(6.35)
8 7 6
5
Unless otherwise specified, dimensions are nominal and in inches (millimeters).
©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
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
T1-52
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