© Coilcraft, Inc. 2007
Specifications subject to change without notice.
Please check our website for latest information.
HDSL2Transformers
Document 202-1
Document 202-1
Revised 02/11/08
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.
Data
Turns
Primary
Leakage
Part
rate
ratio
inductance
inductance
Capacitance
DCR max (Ohms)
number
Style
(kb/s)
chip:line
±15% (mH)
max (µH)
max (pF)
Chip side
Line side
H28161-A
Leaded
1500
1 CT:2.3 CTS
2.0
25
90
1.5 (9-7)
1.5 (1-4), 1.5 (2-5)
H28159-A
Leaded
1500
1 CT:2.3 CTS
2.0
30
55
2.0 (8-6)
2.0 (1-2), 2.0 (3-4)
H28160-A
SMT
1500
1 CT:2.3 CTS
2.0
30
55
2.0 (8-6)
2.0 (1-2), 2.0 (3-4)
H27649-B
Leaded
1500
1 CT:2 CTS
2.0
25
90
1.5 (9-7)
1.5 (1-4), 1.5 (2-5)
H27650-A
Leaded
1500
1 CT:2 CTS
2.0
25
55
2.0 (8-6)
2.0 (1-2), 2.0 (3-4)
H27695-A
SMT
1500
1 CT:2 CTS
2.0
25
55
2.0 (8-6)
2.0 (1-2), 2.0 (3-4)
H28223-B
Leaded
1500
1 CT:2.3 CTS
2.0
30
65
1.85 (10-7) 2.1 (1-4), 2.1 (2-5)
H28224-B
SMT
1500
1 CT:2.3 CTS
2.0
30
65
1.85 (10-7) 2.1 (1-4), 2.1 (2-5)
DC bias
Dielectric
Longitudinal
Part
capacity
strength
Return loss
balance
THD
number
(mA)
(V)
min (dB)
min (dB)
typ (dB)
typ (dB)
H28161-A
100
2300
13 @ 40 kHz
13 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H28159-A
100
3000
13 @ 40 kHz
12 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H28160-A
100
3000
13 @ 40 kHz
12 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H27649-B
100
2300
14 @ 40 kHz
15 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H27650-A
100
3000
14 @ 40 kHz
13 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H27695-A
100
3000
14 @ 40 kHz
13 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H28223-B
100
3000
13 @ 40 kHz
13 @ 320 kHz
65 @ 40 kHz
-85 @ 20 kHz
H28224-B
100
2300
13 @ 40 kHz
13 @ 320 kHz
65 @ 40 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.
This product is not RoHS-compliant. Contact Coilcraft
for current status or possible alternatives.
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