Document 202-1
HDSL2 Transformers
This product is not RoHS-compliant. Contact Coilcraft
for current status or possible alternatives.
This family of transformers provides optimum perfor-
mance with the Level One SK70740/-41/-42 and other
HDSL2 transceiver chip sets. The series now includes
parts with a 1 CT to 2.3 CTS turns ratio, allowing them to
work with line drivers for lower power supply voltages.
They’re engineered for minimum DC resistance and
very low leakage inductance. Primary inductance with
and without DC bias is stable from -40°C to +85°C.
The return loss, longitudinal balance and THD are
optimized for the best overall performance at the
HDSL2 transmission speed.
For free evaluation samples or to discuss custom de-
signs, please contact Coilcraft.
Part
number
H28161-A
H28159-A
H28160-A
H27649-B
H27650-A
H27695-A
H28223-B
H28224-B
Style
Leaded
Leaded
SMT
Leaded
Leaded
SMT
Leaded
SMT
DC bias
capacity
(mA)
100
100
100
100
100
100
100
100
Data
rate
(kb/s)
1500
1500
1500
1500
1500
1500
1500
1500
Turns
ratio
chip:line
1 CT:2.3 CTS
1 CT:2.3 CTS
1 CT:2.3 CTS
1 CT:2 CTS
1 CT:2 CTS
1 CT:2 CTS
1 CT:2.3 CTS
1 CT:2.3 CTS
Primary
inductance
±15% (mH)
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
Leakage
inductance
max (µH)
25
30
30
25
25
25
30
30
DCR max (Ohms)
Capacitance
max (pF)
Chip side
Line side
90
55
55
90
55
55
65
65
1.5
2.0
2.0
1.5
2.0
(9-7)
(8-6)
(8-6)
(9-7)
(8-6)
1.5
2.0
2.0
1.5
2.0
(1-4),
(1-2),
(1-2),
(1-4),
(1-2),
1.5
2.0
2.0
1.5
2.0
(2-5)
(3-4)
(3-4)
(2-5)
(3-4)
2.0 (8-6) 2.0 (1-2), 2.0 (3-4)
1.85 (10-7) 2.1 (1-4), 2.1 (2-5)
1.85 (10-7) 2.1 (1-4), 2.1 (2-5)
Part
number
H28161-A
H28159-A
H28160-A
H27649-B
H27650-A
H27695-A
H28223-B
H28224-B
Dielectric
strength
(V)
2300
3000
3000
2300
3000
3000
3000
2300
Return loss
min (dB)
min (dB)
13
13
13
14
14
@
@
@
@
@
40
40
40
40
40
kHz
kHz
kHz
kHz
kHz
13
12
12
15
13
@
@
@
@
@
320
320
320
320
320
kHz
kHz
kHz
kHz
kHz
Longitudinal
balance
typ (dB)
65
65
65
65
65
@
@
@
@
@
40
40
40
40
40
kHz
kHz
kHz
kHz
kHz
THD
typ (dB)
-85
-85
-85
-85
-85
@
@
@
@
@
20
20
20
20
20
kHz
kHz
kHz
kHz
kHz
14 @ 40 kHz
13 @ 40 kHz
13 @ 40 kHz
13 @ 320 kHz
13 @ 320 kHz
13 @ 320 kHz
65 @ 40 kHz
65 @ 40 kHz
65 @ 40 kHz
-85 @ 20 kHz
-85 @ 20 kHz
-85 @ 20 kHz
1. All electrical specifications referenced to line side.
2. Operating temperature range -40°C to +85°C.
3. Electrical specifications at 25°C.
Specifications subject to change without notice.
Please check our website for latest information.
Document 202-1
Revised 02/11/08
© Coilcraft, Inc. 2007
Document 202-2
HDSL2 Transformers
H27650-A, H28159-A
C
A
Dot above pin 1
H27695-A, H28160-A
4
5
Dot above pin 1
C
A
E
4
5
D
B
E
1
8
B
E
F
1
8
F
G
H
Recommended
Board Layout
Recommended
Land Pattern
F
G
Packaged 100 per tray
A max B max C max D min
0.650
16,51
0.675
17,15
0.35
8,9
3,19
E
13,74
F typ
3,76
G dia H dia
0,51
0,76 mm
A max
0.675
17,14
B max
0.925
23,50
C max
0.35
8,9
E
0.591
15,01
Packaged 60 per tray
F typ
3,76
G typ
2,01 × 2,79
mm
0.125 0.541 0.148 0.020 0.030 inches
0.148 0.079 × 0.110 inches
H28223-B
B
1
10
H28224-B
Dot above pin1
C
C
A
D
5
6
E
5
6
B
E
5
6
E
A
F
1
10
1
G
1
10
H
Recommended
Board Layout
Recommended
Land Pattern
G
Packaged 50 per tray
A max B max
0.550
3,97
0.550
13,97
C max
0.500
12,70
D min
0.100
3,0
E
0.400
10,16
Packaged 100 per tray
A max
0.530
13,46
B max
0.699
17,75
C max
0.500
12,70
E
0.590
14,99
F typ
2,50
F typ
0.100
2,54
G dia
0.013
0,33
H dia
0.032 inches
0,82 mm
G typ
1,27 × 1,55
mm
0.098 0.050 × 0.061 inches
H27649-B, H28161-A
Dot on pin 1
1
9
H27650-A, H28159-A,
H27695-A, H28160-A
F
Line side
1
Chip side
8
H28223-B, H28224-B
Line side
1
Chip side
10
A
7
5
G
E
B
F
C
H
D
Recommended
Board Layout
2
3
7
4
2
9
4
6
5
7
H27649-B, H28161-A
Line side
1
Chip side
9
Packaged 49per tray
A max B max C max
0.930
23,62
1.05
26,7
0.46
11,7
D min
0.12
3,0
E
0.800
20,32
F typ
0.150
3,81
G typ
0,43 × 0,97
H typ
inches
mm
5
7
4
2
8
0.017 × 0.038 0.045 × 0.025
1,14 × 0,64
Specifications subject to change without notice.
Please check our website for latest information.
Document 202-2
Revised 02/11/08
© Coilcraft, Inc. 2007