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Document 606-1
Miniature SMT Transformers
These miniature transformers were developed for use with
Maxim RS-232/RS-485 interface ICs, and are suitable
for gate drive and other power applications. They were
designed to work with the MAX250, MAX251, MAX253
and MAX845 for providing power to the isolated side of
the interface, and are also specified by Linear Technology,
Sipex and others for use with their chipsets.
They feature 1500 Vrms isolation between windings in a
miniature surface mount package. Each transformer has
a stainless steel cover that provides an excellent surface
for automated placement.
In addition to the standard parts shown, Coilcraft can
produce custom transformers with voltage, inductance
and DCR values to meet your specific requirements. For
more information, contact Coilcraft.
Part Pri / sec Inductance
Vporlot-dtuimcte2 DC R max (Ohms)
number1 voltage min (µH) typ (Vµsec) pri      sec
Isolation Pri / sec Pri : sec
pri-sec capacitance Turns Power5
(Vrms) typ (pF)3 ratio4
(W) Size
Q4470-CL_ 5 V to 5 V 400 (1-3)   32 (1-3) 0.950 (1-3)
1.25 (6-4)
1500 (1-4)
0.87 1 CT : 1.3 CT 0.25 C
S5394-CL_ 5 V to 10 V 400 (1-3)   32 (1-3) 0.950 (1-3)
0.950 (6-4)
1500 (1-4)
0.92 1 CT : 1 0.25 C
U6982-CL_ 3.3 V to 5 V   59 (1-3)   22 (1-3) 0.700 (1-3)
1.800 (6-4)
1500 (1-4)
0.93 1 CT : 2.1 CT 0.75 C
T6437-DL_ 5 V to 5V 1000 (1-4) 134 (1-4) 1.010 (1-2, 3-4) 1.955 (8-5)
1500 (1,3-8) 1.88 1 CT : 1 1.5 D
S5499-DL_ 5 V to 24 V 160 (1-4)   48 (1-4) 0.540 (1-2, 3-4) 4.28 (8-7, 6-5) 1500 (1,3-8,6) 1.59 1 CT : 5 CT 1.0 D
T6650-DL_ 5 V to 24 V 176 (2-3)   48 (2-3) 1.015 (2-3)
8.250 (7-6)
1500 (2-7)
1.25
1 : 5 1.0 D
1. When ordering, please specify packaging code:
Q4470-CLD
Packaging: D = 13machine-ready reel. EIA-481 embossed plastic
tape (Size C: 1000 per full reel; Size D: 500 per full
reel).
B = Less than full reel. In tape, but not machine ready.
To have a leader and trailer added ($25 charge), use
code letter D instead.
2. Volt-time product is based on core area, number of primary turns and
4800 Gauss flux density.
3. Capacitance measured from full primary to full secondary at 200 kHz.
4. CT indicates center tap.
5. Calculated output power based on 150 kHz operating frequency.
Power varies depending on application.
6. Ambient temperature range: –40°C to +85°C
7. Storage temperature range: Component: –40°C to +85°C
Tape and reel packaging: –40°C to +80°C
8. Resistance to soldering heat: Three reflows at >217°C for 90 seconds
(+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room
temperature between.
9. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
        Chipset
Linear Linear Maxim Maxim Maxim Sipex Sipex
LT1952 LTC3900 250/251 253/845 3535E SP3222 SP3232
 Q4470-CL
 S5394-CL
 U6982-CL
  
 T6437-DL
 S5499-DL
 T6650-DL
Q4470-CL
U6982-CL
S5394-CL
16
16
16
Pri 2
5 Sec Pri 2
5 Sec Pri 2
Sec
34 3434
T6437-DL
S5499-DL
T6650-DL
18 1827
Pri
2
3
Sec
Pri
2
3
7
6
Sec
Pri
Sec
454 536
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
Document 606-1  Revised 05/06/09
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

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Document 606-2
Miniature SMT Transformers
C Size
Q4470-CL, S5394-CL, U6982-CL
0.260
6,60
max
Dot above
pin 1
0.215
5,46
max
Recommended
Land Pattern
0.050
1,27
sq
0.004 / 0,10
0.283
7,20
min
0.350
8,89
max
1
0.375
9,53
0.100
2,54
0.023
0,60
0.100
2,54
6
4
1
0.275
6,99
max
3
0.039
1,0
min
Bottom View
Weight  510 – 550 mg
Terminations  Tin-silver over tin over nickel over phos bronze
Packaging  1000 per 13reel  Plastic tape:  16 mm wide,
0.34 mm thick, 12 mm pocket spacing, 5.33 mm pocket depth
D Size
S5499-DL, T6437-DL, T6650-DL
08.3,7454max
Dot above
pin 1
0.215
5,46
max
0.500
12,70
0.075
1,905
Recommended
Land Pattern
0.050
1,27
0.004 / 0,10
0.023 8
0,60
0.415
10,55
min
0.500
12,70
max
1
0.400
10,16
max
0.100
2,54
1
0.100
2,54
5
4
0.035
0,90
min
Bottom View
Weight  0.98 – 1.1 g
Terminations  Tin-silver over tin over nickel over phos bronze
Tape and reel  500 per 13reel  Plastic tape:  24 mm wide,
0.36 mm thick, 16 mm pocket spacing, 6.13 mm pocket depth
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
Document 606-2  Revised 05/06/09
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.