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© Coilcraft Inc. 2012

This product may not be used in medical or high

risk applications without prior Coilcraft approval.

Specification subject to change without notice.

Please check out web site for latest information.

xDSLInterfaceTransformers

Document 231

Document 231 Revised 01/16/08

These transformers provide coupling and line isolation

for xDSL interfaces using the Linear Technology LT1794,

LT1795 and LT1886 amplifiers.

They feature very low leakage inductance, stable primary

inductance from -40°C to +85°C and longitudinal balance

optimized for the best overall performance at ADSL and

HDSL2 transmission speeds.

In addition to the standard models shown, Coilcraft can

provide custom transformers with other turn ratios.

For free evaluation samples or to discuss custom designs,

contact Coilcraft or visit

www.coilcraft.com.

1. Turns ratio is with the chip side windings connected in series.

2. All electrical specifications referenced to line side.

3. Operating temperature range -40°C to +85°C.

4. Electrical specifications at 25°C.

Line side

Leakage

Part

inductance

inductance

DCR max (Ohms)

number

Style

Chip set

(mH)

(µH) max

Chip side

Line side

X8390-A

SMT

LT1794, LT1886

0.368 ±5%

11

0.841 (6-9, 7-10)

1.95 (4-2)

X8502-A

SMT

LT1794, LT1886

0.368 ±5%

11

0.895 (6-9, 7-10)

1.70 (4-2)

X8505-A

SMT

LT1886

0.368 ±5%

11

0.750 (6-9, 7-10)

1.85 (4-2)

X8504-A

SMT

LT1795

0.368 ±5%

11

0.875 (6-9, 7-10)

1.75 (4-2)

Dielectric

Longitudinal

Part

strength

balance

Designed

number

(V)

line:chip

(dB) min

to meet

X8390-A

1500

1

:1

45 (20 kHz - 1.1 MHz)

UL 1459, 1950

X8502-A

1500

1

:1.2

42 (20 kHz - 1.1 MHz)

UL 1459, 1950

X8505-A

1500

1

:1.5

42 (20 kHz - 1.1 MHz)

UL 1459, 1950

X8504-A

1500

1

:1.4

42 (20 kHz - 1.1 MHz)

UL 1459, 1950

For LT1794, LT1795

and LT1886

A

Dot above pin1

C

B

5

1

Recommended

Land Pattern

E

F

G

1

6

10

Tape and reel 175 per 13

″ reel Plastic tape: 32 mm wide,

0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth

A max B max C max E

F typ

G typ

0.530

0.699

0.500

0.590

0.098

0.061 × 0.050

13,46

17,75

12,70

14,99

2,50

1,55 × 1,27

9

10

2

6

7

4

Line side

Chip side

This product is not RoHS-compliant.Contact Coilcraft for

current status or possible alternatives.

Chip side windings to be connected

in series on the PC board