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PDF L3121B Data sheet ( Hoja de datos )
| Número de pieza | L3121B | |
| Descripción | PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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®
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
1 page  
Fig. 1: Surge peak current versus overload
duration (typical values).
ITSM(A)
40
35
30
25
20
15
10
5
0
1E-2
t(s)
1E-1
1E+0
1E+1
F=50H z
Tj initial=25°C
1E+2
1E+3
L3121B
Fig. 2: Typical relative variation of holding current
versus ambient temperature.
IH [Tamb]
IH [Tamb = 25°C]
1.45
1.30
1.15
1.0
0.85
Tamb (°C)
0.70
-40 -20 0
20 40 60 80 85
Fig. 3: Typical relative variation of breakdown
voltage versus ambient temperature.
VBR [Tamb]
VBR [Tamb = 25°C]
2.04
2.00
IR = 1 mA
1.06
1.02
0.98
0.94
0.90
-40 -20 0
Tamb (°C)
20 40 60 80 85
Fig. 4: Junction capacitance versus reverse
applied voltage.
Fig. 5: Typical relative variation of leakage current
versus ambient temperature.
Fig. 6: Typical relative variation of peak pulse
current (10/1000µs) versus ambient temperature.
IR[Tj] / IR [Tj=25°C]
1E+5
1E+4
1E+3
1E+2
1E+1
1E+0
25
Tj(°C)
50 75
100
Ipp[Tamb] / Ipp [25°C]
1.10
1.05
1.00
0.95
Tamb(°C)
125
0.90
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet L3121B.PDF ] | |
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