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© 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.

Miniature SMT Transformers

Document 606-1

Volt-time

Isolation

Pri / sec

Pri : sec

Part

Pri / sec

DCR max (Ohms)

pri-sec

capacitance Turns

voltage

min (µH) typ (Vµsec)

pri

sec

(Vrms)

(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

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.

1. When ordering, please specify

packaging code:

Q4470-CLD

Packaging:

D = 13

″ machine-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

T6437-DL

T6650-DL

S5499-DL

S5394-CL

U6982-CL

1

2

3

4

8

5

1

8

2

7

3

6

4

5

7

2

6

3

1

6

4

3

2

6

1

3

2

4

5

6

11

33

22

4

5

Pri

Sec

Pri

Sec

Pri

Sec

Pri

Sec

Pri

Sec

Pri

Sec

Document 606-1 Revised 05/06/09