June 15, 2005

E-Mail: ddisales@datatronics.com

499 King’s Road, Hong Kong

Tel: (852) 2562 3858, (852) 2564 84 77 Fax: (852) 2565 7214, (852) 2563 1290

All specifications are subject to change without notice.

TELECOM TRANSFORMER LM302-1L

FEATURES

• Subminature, Low Profile

• 10.7mm seated Height

• Vacuum encapsulated

• Tested at 6500 VDC

• Meets or exceeds requirements of most international safety standards

• Operating Temperature -20ºC to +85ºC, Storage Temperature -40ºC to +85º C

APPLICATIONS

• V.32, V.32 bis and V.34 MODEMS

• INSTRUMENTATION

ELECTRICAL SPECIFICATIONS AT 25°C

IMPEDANCE

PRIMARY

SECONDARY

600

Ω

600

Ω

SHUNT INDUCTANCE (MIN)

SHUNT LOSS (TYP)

2.8 H

9000

Ω

TURNS RATIO

1 : 1

LEAKAGE INDUCTANCE (TYP) @1KHz

14 mH

INSERTION LOSS @2KHz (MAX)

FREQUENCY RESPONSE @200-3500Hz (MAX)

WIDE BAND RESPONSE @200-10 000Hz (MAX)

1.5 dB

-0.3 dB

-2.5 dB

DC RESISTANCE** (± 10%) PRIMARY

SECONDARY

66

Ω

66

Ω

RETURN LOSS @200-4000Hz (MIN)

LONGITUDINAL BALANCE (MIN)

DISTORTION @ 1kHz 0 dBM

21 dB

80 dB

≤0.1%

INSULATION RESISTANCE @500VDC (MIN)

DIELECTRIC STRENGTH

100 M

Ω

6500 VDC

Note : * For use with recommended circuit (BS6305 impedance Class A non-speech or Class B speech)

** LM302-1L Is symmetrical meaning there is no real primary or secondary winding.

OUTLINE DIMENSIONS:

2.5 TYP

Dia 0.6 typ (4X)

1

4

5

8

7.62

5.08

TYP

10.7 MAX

12.7 +/- 0.15

17.9

17.9

2.5 TYP

3.0

3.0

TYP

TYP

MAX

MAX

4.0 MIN

DATATRONIC

LM 302-1L

DATE

5.08

TYP

RECOMMENDED CIRCUITS

600 Ohm Matching (speech)

1 : 1 ID E A L

600

Ω

6.8

µF ± 5%

56 0

Ω

± 2%

33 nF

± 5%

LIN E

27 nF

± 5%

BS6305 Class (A) Matching (non-speech)

1 : 1 ID E A L

370

Ω

310 nF

620

Ω

3.3

µF

68 nF

± 5%

680

Ω ± 5%

820

Ω

± 2%

47 nF

± 5%