Isolation Transformers

Document 1090

Document 1090 Revised 05/03/13

Pri / output voltages

DCR max

Leakage

Volt-time

Part

Turns

output

output

output

min (µH)

ratio

pri

(pin5)

(pins6&8)

(pin7)

pri

sec

max (µH)

(V-µsec)

CR7983-CL_

256

1

: 2

5 V

+3.3 to +15 V

0 V

No output

0.190

0.350

0.75

18.0

CR7984-CL_

256

1

: 3

5 V

+12 to +24 V

+6 to +12 V

0 V

0.170

0.450

0.75

18.0

CR7985-CL_

256

1

: 5

5 V

+5 to +15 V

0 V

–5 to –15 V

0.170

2.00

0.72

18.0

1. When ordering, please specify a

packaging code:

CR7985-CLD

Packaging: D = 13

″ machine ready reel. EIA-481 embossed plastic

tape (175 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.

Dimensions are in inches

mm

Core material Ferrite

Terminations Tin-silver-copper over tin over nickel over phos bronze

Weight 10.1 g

Ambient temperature –40°C to +125°C

Storage temperature Component: –40°C to +125°C.

Tape and reel packaging: –40°C to +80°C

Resistance to soldering heat Max three 40 second reflows at

+260°C, parts cooled to room temperature between cycles

Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /

85% relative humidity)

Failures in Time (FIT) / Mean Time Between Failures (MTBF)

38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Packaging 175 per 13

″ reel Plastic tape: 44 mm wide, 0.4 mm thick,

32 mm pocket spacing, 11.9 mm pocket depth

PCB washing Tested with pure water or alcohol only. For other solvents,

see Doc787_PCB_Washing.pdf

For Analog Devices ADuM4070

Isolated Switching Regulator

• Developed to work with Analog Devices ADuM4070 Isolated

switching regulator with integrated feedback

• Power rating: 2 Watts

• 5000 Vrms, one second isolation from primary to secondary.

Analog Devices is a trademark of Analog Devices, Inc.

7

11

5

1

6

2

Primary windings and secondary

windings to be connected in

series on the PC board.

8

12

Primary

Output

Output

Output

Secondary

2. Inductance is for the primary, measured from pins 12– 11 at 1 kHz, 0.1 Vrms.

3. DCR is for each winding of the primary and secondary.

4. Leakage inductance is for the primary windings, measured from pins 12– 11

with all secondary windings shorted.

6. Electrical specifications at 25°C.

Refer to Doc 362 “Soldering Surface Mount Components” before soldering.