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Application Specific Discretes

LCP3121

OVERVOLTAGE AND OVERCURRENT

PROTECTION FOR TELECOM LINE

®

s

UNIDIRECTIONAL

OVERVOLTAGE

SUP-

PRESSOR PROGRAMMABLE BY VOLTAGE

AND CURRENT:

s

PROGRAMMABLE BREAKDOWN VOLTAGE

UP TO 100 V.

s

PROGRAMMABLE

CURRENT

LIMITATION

FROM 120 mA TO 600 mA.

s

MULTI-LINE PROTECTION MODE : ONE DE-

VICE CAN PROTECT SEVERAL LINES.

s

HIGH SURGE CURRENT CAPABILITY :

µs.

FEATURES AND BENEFITS

SO-8

Dedicated to the protection of sensitive telecom

equipment, the LCP3121 provides protection

which can be programmed by both voltage and

current.

The breakdown voltage can be easily programmed

by using an external zener diode.

The protection function programmed by the

current

is achieved with the use of a resistor

between the gate and the cathode. The value of

the resistor will determine the level of the desired

current before the triggering of the device.

A multiple protection mode is also performed when

using several diodes providing each line interface

with an optimized protection level.

If desired, a bidirectional protection function can

be achieved by the use of two LCP3121.

DESCRIPTION

April 2003 - Ed: 4

FUNCTIONAL DIAGRAM

A

Gp

C

Gn

CCITT K20 :

10/700

µs

6kV

5/310

µs

150A

VDE 0433 :

10/700

µs

2kV

5/310

µs

50A

VDE 0878 :

1.2/50

µs

1.5kV

1/20

µs

40A

FCC part 68 :

2/10

µs

2.5kV

2/10

µs

200A (*)

BELLCORE

TR-NWT-001089 :

2/10

µs

2.5kV

2/10

µs

200A (*)

BELLCORE

TR-NWT-000974 :

10/1000

µs

1kV

10/1000

µs

100A

(*) with series resistors or PTC.

COMPLIES WITH THE FOLLOWING STANDARDS :

PIN-OUT CONFIGURATION

1

2

3

4

5

6

7

8

C

Gn

Gp

A

A

C

C

C

All cathod pins must be externally connected

TM: ASD is trademarks of STMicroelectronics.