defining a degree of excellence

Corporate Office

Bel Fuse Inc.

198 Van Vorst Street, Jersey City, NJ 07302-4496

Tel: 201-432- 0463

Fax: 201-432-9542

E-Mail: BelFuse@belfuse.com

Internet: http://www.belfuse.com

Far East Office

Bel Fuse Ltd.

8F/8 Luk Hop Street

San Po Kong

Kowloon, Hong Kong

Tel: 852-2328-5515

Fax: 852-2352-3706

European Office

Bel Fuse Europe Ltd.

Preston Technology Management Centre

Marsh Lane, Preston PR1 8UD

Lancashire, U.K.

Tel: 44-1772-556601

Fax: 44-1772-888366

MODEM TRANSFORMER

0574-1000-05

Insertion loss measured at 1000Hz.

Reflected impedance, distortion, Longitudinal balance measured

with 312 ohms across the secondary.

Harmonic Distortion is typically -89dB. The -82dB max is measured at 600Hz,

-10dBm (V.34) ref.

0574-1000-05

Part

Number

+/- 0.25

300Hz to 4000Hz

Frequency

Response (dB)

referenced at 1000Hz

Part

Number

1 : 1

2.5

600

30

145

140

60

40

-82

Pins

(6-4)

Pins

(1-3)

0574-1000-05

Reflected

Impedance

(ohms)

+/-5%

Insertion

Loss (dB)

+/- 0.25dB

Turns

Ratio

(+/- 2%)

1000Hz

Typical

Return Loss

(dB)

200Hz to

1000Hz

1000Hz to

4000Hz

Longitudinal

Balance (dB) Min

DCR

(

Ω) +/- 10%

600Hz

Harmonic

Distortion

(dB) Max

* 1250 Vrms isolation Voltage.

* Meets or exceeds requirements of:

CAN/CSA-C22.2 (1988) No. 225(M90),

and DOC's C3-03 (Issue 7): UL's

UL1950; 2nd edition; and FCC's

Part 68(58 FR 44907, Aug 25, 1993).

* Weight is 5.0 grams.

Bel proudly introduces a new modem transformer for

data/fax modem applications including V.34bis 28,800 bps

applications. These

transformers exhibit

very low distortion

values, typically -89dB.

Date Code

bel

0574-1000-05

0.197(5.00)

Typ

0.470

(11.94)

Max

0.025

(0.64)

Square

0.394

(10.0)

0.10

(2.54)

Min

M

E

C

H

A

N

I

C

A

L

S

Pin 1

4

5

6

0.550

(13.97)

Max

3

0.550(13.97)

Max

Dimensions are in inches (mm).

Dimension tolerance +/- 0.01(0.25)

unless otherwise stated.

Secondary

1

Primary

6

4

3

SCHEMATIC

TM0042

T402