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PDF ( 数据手册 , 数据表 ) L3121B

零件编号 L3121B
描述 PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION
制造商 STMicroelectronics
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L3121B 数据手册, 描述, 功能
®
Application Specific Discretes
A.S.D.TM
L3121B
PROGRAMMABLE TRANSIENT VOLTAGE
SUPPRESSOR FOR SLIC PROTECTION
FEATURES
BIDIRECTIONAL FUNCTION WITH VOLTAGE
PROGRAMMABILITY IN BOTH POSITIVE AND
NEGATIVE POLARITIES.
PROGRAMMABLE BREAKDOWN VOLTAGE
UP TO 100 V.
HOLDING CURRENT = 150 mA min.
HIGH SURGE CURRENT CAPABILITY.
IPP = 100A , 10/1000 µs
SIP4
DESCRIPTION
This device has been especially designed to pro-
tect a subscriber line interface circuit (SLIC) with
an integrated ring generator.
Used with the recommended application circuit,
each line (TIP and RING) is protected against posi-
tive and negative surges. In the positive polarity,
the breakdown voltage is referenced to the + VB ,
and in the negative polarity, the breakdown voltage
is referenced to the -Vbat .
Its high surge current capability makes the L3121B
a reliable protectiondevice for very exposed equip-
ment, or when series resistors are very low.
SCHEMATIC DIAGRAM
CONNECTION DIAGRAM
Line
Gate P
Gate N
GND
May 1999 - Ed:4A
1/7












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