Magnetics
Shielded Surface Mount
Coupled Inductors
MODELS HM78D-128XXXXLF, HM78D-755XXXMLF
Operating Temperature Range -40°C to +125°C
Temperature Rise, Maximum 40°C
Operating Frequency Up to 3MHz
RoHS Compliant
Electrical Schematic
Coupled Inductors, transformer and SEPIC mode
Autotransformer and series mode
Parallel Mode
Specifications @ 25°C
Parallel Connection
Part Number
HM78D-1284R7MLF
HM78D-1285R6MLF
HM78D-1286R8MLF
HM78D-1288R2MLF
HM78D-128100MLF
HM78D-128120MLF
HM78D-128150MLF
HM78D-128180MLF
HM78D-128220MLF
HM78D-128270MLF
HM78D-128330MLF
HM78D-128390MLF
HM78D-128470MLF
HM78D-128560MLF
HM78D-128680MLF
HM78D-128820MLF
HM78D-128101MLF
HM78D-128121KLF
HM78D-128151KLF
HM78D-128181KLF
HM78D-128221KLF
HM78D-128271KLF
HM78D-128331KLF
HM78D-128391KLF
HM78D-128471KLF
HM78D-128561KLF
HM78D-128681KLF
HM78D-128821KLF
HM78D-128102KLF
HM78D-755R33MLF
HM78D-7551R0MLF
HM78D-7551R5MLF
HM78D-7552R2MLF
HM78D-7553R3MLF
HM78D-7554R7MLF
Series Connection
l
sat
(3)
(A)
14.90
13.40
13.10
10.80
10.50
9.60
9.10
8.00
6.80
6.50
5.60
5.50
5.20
4.50
4.10
3.80
3.40
3.20
2.80
2.50
2.30
2.10
1.90
1.70
1.60
1.50
1.30
1.20
1.10
18.4
10.20
8.35
7.06
5.40
4.37
7.40
7.20
6.90
6.60
6.20
6.00
5.80
5.50
5.20
4.70
4.20
3.60
3.00
2.80
2.60
2.30
2.00
1.90
1.80
1.70
1.60
1.50
1.30
1.10
0.87
0.83
0.76
0.69
0.60
0 6.20
5.33
4.96
4.66
3.94
3.34
L
(1)
(μH)
4.7 ± 20%
5.6 ± 20%
6.8 ± 20%
8.2 ± 20%
10 ± 20%
12 ± 20%
15 ± 20%
18 ± 20%
22 ± 20%
27 ± 20%
33 ± 20%
39 ± 20%
47 ± 20%
56 ± 20%
68 ± 20%
82 ± 20%
100 ± 20%
120 ± 10%
150 ± 10%
180 ± 10%
220 ± 10%
270 ± 10%
330 ± 10%
390 ± 10%
470 ± 10%
560 ± 10%
680 ± 10%
820 ± 10%
1000 ± 10%
0.33 ± 20%
1.0 ± 20%
1.5 ± 20%
2.2 ± 20%
3.3 ± 20%
4.7 ± 20%
DCR Typ.
(2)
(Ω)
0.019
0.023
0.024
0.025
0.029
0.031
0.036
0.040
0.048
0.060
0.075
0.080
0.090
0.095
0.105
0.140
0.150
0.205
0.230
0.255
0.345
0.450
0.510
0.560
0.765
0.845
1.145
1.275
1.415
0.0074
0.0100
0.0115
0.0130
0.0183
0.0254
l
rms
(4)
(A)
L
(1)
(μH)
18.8 ± 25%
22.4 ± 25%
27.2 ± 25%
32.8 ± 25%
40 ± 25%
48 ± 25%
60 ± 25%
72 ± 25%
88 ± 25%
108 ± 25%
132 ± 25%
156 ± 25%
188 ± 25%
224 ± 25%
272 ± 25%
328 ± 25%
400 ± 25%
480 ± 25%
600 ± 25%
720 ± 25%
880 ± 25%
1080 ± 25%
1320 ± 25%
1560 ± 25%
1880 ± 25%
2240 ± 25%
2720 ± 25%
4000 ± 30%
4800 ± 30%
1.176 ± 20%
3.808 ± 20%
5.688 ± 20%
7.944 ± 20%
13.58 ± 20%
20.73 ± 20%
DCR Typ.
(2)
(Ω)
0.076
0.092
0.096
0.100
0.116
0.124
0.144
0.158
0.190
0.240
0.300
0.320
0.360
0.380
0.420
0.560
0.600
0.820
0.920
1.02
1.38
1.80
2.04
2.24
3.06
3.38
4.58
5.10
5.66
0.0295
0.0400
0.0461
0.0521
0.0732
0.102
7.70
6.60
6.40
5.60
5.40
4.80
4.30
3.90
3.50
3.40
3.10
2.80
2.60
2.40
2.10
1.90
1.70
1.60
1.40
1.30
1.10
1.00
0.92
0.84
0.80
0.73
0.63
0.58
0.56
9.18
5.10
4.17
3.53
2.70
2.19
l
sat
(3)
(A)
3.60
3.50
3.40
3.30
3.20
2.90
2.70
2.50
2.20
2.00
1.70
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.89
0.84
0.75
0.71
0.62
0.53
0.43
0.40
0.36
0.33
0.30
3.10
2.66
2.48
2.33
1.97
1.67
l
rms
(4)
(A)
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
http://www.ttelectronics.com/magnetics/customer-service-enquiry
BI Technologies
A-1445, Jalan Tanjung Api
25050 Kuantan
Pahang Darul Makmur
Malaysia
Ph: +60 9 565 8888 Fax: +60 9 514 3555
Rev. 02
8.17
Shielded Surface
Mount Coupled Inductors
MODELS HM78D-128XXXXLF, HM78D-755XXXMLF
Specifications @ 25°C continued
Parallel Connection
Part Number
HM78D-7556R8MLF
HM78D-7558R2MLF
HM78D-755100MLF
HM78D-755150MLF
HM78D-755220MLF
HM78D-755330MLF
HM78D-755470MLF
HM78D-755680MLF
HM78D-755820MLF
HM78D-755101MLF
HM78D-755151MLF
HM78D-755221MLF
HM78D-755331MLF
HM78D-755471MLF
HM78D-755681MLF
HM78D-755821MLF
HM78D-755102MLF
Series Connection
l
sat
(3)
(A)
3.67
3.40
3.17
2.48
2.13
1.73
1.41
1.19
1.11
0.99
0.81
0.66
0.54
0.46
0.38
0.35
0.31
2.60
2.53
2.41
2.11
1.75
1.41
1.15
1.03
0.91
0.86
0.69
0.56
0.45
0.40
0.33
0.31
0.27
L
(1)
(μH)
6.8 ± 20%
8.2 ± 20%
10 ± 20%
15 ± 20%
22 ± 20%
33 ± 20%
47 ± 20%
68 ± 20%
82 ± 20%
100 ± 20%
150 ± 20%
220 ± 20%
330 ± 20%
470 ± 20%
680 ± 20%
820 ± 20%
1000 ± 20%
DCR Typ.
(2)
(Ω)
0.0418
0.0441
0.0489
0.0637
0.0925
0.143
0.216
0.265
0.345
0.383
0.591
0.907
1.41
1.74
2.58
2.93
3.89
l
rms
(4)
(A)
L
(1)
(μH)
29.38 ± 20%
34.26 ± 20%
39.53 ± 20%
64.36 ± 20%
86.92 ± 20%
132 ± 20%
198.6 ± 20%
278.7 ± 20%
323.8 ± 20%
406.4 ± 20%
600 ± 20%
908 ± 20%
1342 ± 20%
1861 ± 20%
2685 ± 20%
3251 ± 20%
4036 ± 20%
DCR Typ.
(2)
(Ω)
0.167
0.177
0.196
0.255
0.371
0.574
0.865
1.06
1.38
1.53
2.37
3.63
5.66
6.97
10.30
11.70
15.60
1.84
1.70
1.58
1.24
1.07
0.87
0.71
0.60
0.55
0.49
0.41
0.33
0.27
0.23
0.19
0.17
0.16
l
sat
(3)
(A)
1.30
1.27
1.20
1.05
0.874
0.702
0.573
0.517
0.453
0.430
0.346
0.279
0.224
0.202
0.166
0.156
0.135
l
rms
(4)
(A)
Notes: (1) Inductance is measured at 100 kHz, 0.1Vrms without DC current.
(2) DCR Typ. is only for 755 series while 128 series is of DCR Max.
(3) I
sat
is the saturation current at which inductance rolls off approximately 30% from its initial (zero DC) value.
(4) I
rms
is the approximate current at which ΔT = 40°C.
Outline Dimensions (mm)
Top View
Side View
Bottom View
Recommended Solder Pad Layout
Case Size
128
755
A
12.5
7.7
B
12.5
7.7
C
8.05
4.8
D
5.0
3.9
E
5.0
2.7
F
3.5
1.55
G
1.5
0.72
H
4.2
2.2
I
5.5
2.8
J
4.5
3.1
K
2.0
1.0
L
12.8
7.5
M
4.2
2.2
N
4.5
3.1
P
2.0
1.0
Q
4.2
2.2
R
5.5
2.8
S
4.5
3.1
Packaging
Standard:
Embossed Tape and Reel
Reel:
Diameter:
Capacity:
Case size 128
Case size 755
=
=
=
13” (330.2mm)
500 Units
1,000 Units
Ordering Information
Model Series
Case Size:
128, 755
Inductance Code:
First 2 digits are significant. Last digit denotes
the number of trailing zeros. For values below
10μH, “R” denotes the decimal point.
HM78D - 128 4R7 M LF TR
Tape & Reel Packing
Lead-Free
Inductance Tolerance
K = ± 10%
M = ± 20%
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
http://www.ttelectronics.com/magnetics/customer-service-enquiry
BI Technologies
A-1445, Jalan Tanjung Api
25050 Kuantan
Pahang Darul Makmur
Malaysia
Ph: +60 9 565 8888 Fax: +60 9 514 3555
Rev. 02
8.17
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